@property --glass-angle { syntax: "<angle>"; inherits: false; initial-value: 140deg; }
:root {
    --page:#edf4ff; --page-2:#faf8ff; --ink:#0d1b34; --muted:#64718a; --blue:#2864ff; --blue-dark:#1645c7;
    --purple:#7655ff; --cyan:#39b9e8; --green:#087e62; --amber:#a86200; --red:#b42a41;
    --glass:rgba(255,255,255,.62); --glass-strong:rgba(255,255,255,.79); --glass-line:rgba(255,255,255,.82);
    --line:rgba(73,100,151,.15); --shadow:0 24px 70px rgba(35,69,132,.14), inset 0 1px 0 rgba(255,255,255,.94);
    --shadow-hover:0 30px 80px rgba(35,69,132,.2), inset 0 1px 0 rgba(255,255,255,.96); --radius:28px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;min-height:100vh;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Segoe UI",sans-serif;line-height:1.55;background:radial-gradient(circle at 0 0,rgba(84,150,255,.38),transparent 32rem),radial-gradient(circle at 100% 12%,rgba(143,102,255,.28),transparent 35rem),radial-gradient(circle at 50% 110%,rgba(69,205,227,.24),transparent 38rem),linear-gradient(140deg,var(--page),var(--page-2) 48%,#effbff);background-attachment:fixed;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;opacity:.18;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E")}
a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{color:inherit}.ambient{position:fixed;border-radius:999px;filter:blur(4px);pointer-events:none;z-index:-1;opacity:.65}.ambient-one{width:300px;height:300px;top:90px;left:-170px;background:radial-gradient(circle,rgba(37,111,255,.4),transparent 70%)}.ambient-two{width:420px;height:420px;right:-240px;top:40%;background:radial-gradient(circle,rgba(133,83,255,.32),transparent 70%)}.ambient-three{width:360px;height:360px;left:32%;bottom:-270px;background:radial-gradient(circle,rgba(57,185,232,.3),transparent 70%)}
svg{display:block;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.glass-panel{position:relative;background:linear-gradient(var(--glass-angle),rgba(255,255,255,.84),rgba(255,255,255,.52));border:1px solid var(--glass-line);box-shadow:var(--shadow);backdrop-filter:blur(28px) saturate(170%);-webkit-backdrop-filter:blur(28px) saturate(170%)}.glass-panel::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;background:linear-gradient(125deg,rgba(255,255,255,.55),transparent 28%,transparent 70%,rgba(255,255,255,.22));opacity:.58}
.site-header{position:sticky;top:0;z-index:50;padding:14px 22px;background:rgba(244,248,255,.62);border-bottom:1px solid rgba(255,255,255,.76);backdrop-filter:blur(28px) saturate(170%);-webkit-backdrop-filter:blur(28px) saturate(170%)}.header-inner{width:min(1240px,100%);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:11px}.brand-mark{display:grid;place-items:center;width:44px;height:44px;color:white;border-radius:15px;background:linear-gradient(145deg,#215fff,#754cff);box-shadow:0 12px 28px rgba(49,83,225,.28),inset 0 1px 0 rgba(255,255,255,.5)}.brand-mark svg{width:25px}.brand-copy{display:grid;line-height:1.05}.brand-copy strong{font-size:1.08rem;letter-spacing:-.02em}.brand-copy small{margin-top:4px;color:var(--muted);font-size:.69rem;font-weight:650}.top-nav{display:flex;align-items:center;gap:5px;padding:5px;border:1px solid rgba(255,255,255,.78);border-radius:16px;background:rgba(255,255,255,.45);box-shadow:inset 0 1px 0 rgba(255,255,255,.8)}.top-nav a{padding:9px 15px;color:var(--muted);border-radius:12px;font-size:.91rem;font-weight:720;transition:.18s ease}.top-nav a:hover,.top-nav a.is-active{color:var(--ink);background:rgba(255,255,255,.78);box-shadow:0 6px 18px rgba(38,68,126,.1)}.mobile-nav-button{display:none;width:44px;height:44px;padding:10px;border:1px solid rgba(255,255,255,.8);border-radius:14px;background:rgba(255,255,255,.6)}.mobile-nav-button span{display:block;height:2px;margin:4px 0;border-radius:2px;background:var(--ink)}
.page-shell{width:min(1240px,calc(100% - 34px));min-height:calc(100vh - 170px);margin:0 auto;padding:42px 0 74px}.site-footer{width:min(1240px,calc(100% - 34px));margin:0 auto 28px;padding:22px 4px;display:flex;align-items:center;justify-content:space-between;gap:20px;color:var(--muted);font-size:.82rem;border-top:1px solid rgba(77,102,151,.12)}.site-footer div{display:flex;gap:10px}.site-footer strong{color:var(--ink)}
.home-hero{min-height:510px;padding:clamp(32px,5vw,72px);display:grid;grid-template-columns:1.2fr .8fr;gap:35px;align-items:center;border-radius:38px;overflow:hidden}.home-hero::before{content:"";position:absolute;width:430px;height:430px;right:-120px;top:-120px;border-radius:50%;background:radial-gradient(circle,rgba(87,124,255,.25),transparent 68%)}.hero-copy-block{position:relative;z-index:2}.hero-label{display:inline-flex;align-items:center;gap:8px;padding:7px 11px;border-radius:999px;color:#1748ba;background:rgba(255,255,255,.62);border:1px solid rgba(255,255,255,.82);font-size:.78rem;font-weight:800;letter-spacing:.04em}.hero-label i,.state-live i{width:7px;height:7px;border-radius:99px;background:#1bb785;box-shadow:0 0 0 5px rgba(27,183,133,.12)}.home-hero h1{margin:25px 0 20px;font-size:clamp(3.25rem,7vw,6.8rem);line-height:.91;letter-spacing:-.066em}.home-hero h1 span{display:inline-block;color:transparent;background:linear-gradient(105deg,#1a55e8 5%,#7755ff 55%,#20a4d2);background-clip:text;-webkit-background-clip:text}.home-hero p{max-width:690px;margin:0;color:var(--muted);font-size:clamp(1rem,1.7vw,1.21rem)}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}.button{position:relative;z-index:1;display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:50px;padding:12px 19px;border:1px solid transparent;border-radius:15px;font-weight:780;transition:transform .16s ease,box-shadow .16s ease}.button:hover{transform:translateY(-2px)}.button svg{width:19px}.button-primary{color:white;background:linear-gradient(135deg,#225dff,#7450ff);box-shadow:0 14px 32px rgba(56,79,223,.27)}.button-primary:hover{box-shadow:0 18px 38px rgba(56,79,223,.34)}.button-glass{background:rgba(255,255,255,.58);border-color:rgba(255,255,255,.85);box-shadow:0 12px 28px rgba(41,74,135,.1)}.hero-visual{position:relative;z-index:2;display:grid;place-items:center;min-height:360px}.visual-core{position:relative;z-index:3;display:grid;place-items:center;width:190px;height:190px;color:white;border-radius:50%;background:linear-gradient(145deg,rgba(34,92,255,.92),rgba(123,80,255,.9));border:1px solid rgba(255,255,255,.55);box-shadow:0 35px 85px rgba(62,85,214,.34),inset 0 2px 0 rgba(255,255,255,.38);backdrop-filter:blur(20px)}.visual-core span{font-size:4.2rem;font-weight:850;line-height:.8;letter-spacing:-.06em}.visual-core small{margin-top:-24px;color:rgba(255,255,255,.82);font-weight:700}.visual-orbit{position:absolute;border:1px solid rgba(87,116,184,.18);border-radius:50%}.orbit-one{width:295px;height:295px}.orbit-two{width:375px;height:375px;border-style:dashed}.floating-chip{position:absolute;z-index:4;padding:9px 13px;border:1px solid rgba(255,255,255,.8);border-radius:13px;background:rgba(255,255,255,.68);box-shadow:0 12px 30px rgba(42,72,133,.14);backdrop-filter:blur(16px);font-size:.79rem;font-weight:760}.chip-one{top:40px;left:7%}.chip-two{right:0;top:45%}.chip-three{bottom:30px;left:11%}
.section-intro{display:flex;align-items:end;justify-content:space-between;gap:30px;padding:62px 4px 24px}.eyebrow,.section-kicker{display:block;margin:0 0 7px;color:#2860e5;font-size:.72rem;font-weight:840;letter-spacing:.12em;text-transform:uppercase}.section-intro h2{margin:0;font-size:clamp(2rem,4vw,3.3rem);letter-spacing:-.045em}.section-intro p{max-width:490px;margin:0;color:var(--muted)}.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.module-card{position:relative;min-height:380px;padding:25px;overflow:hidden;border:1px solid rgba(255,255,255,.82);border-radius:28px;background:rgba(255,255,255,.57);box-shadow:var(--shadow);backdrop-filter:blur(25px) saturate(160%);transition:transform .2s ease,box-shadow .2s ease}.module-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}.module-card::before{content:"";position:absolute;width:190px;height:190px;right:-70px;bottom:-80px;border-radius:50%;background:radial-gradient(circle,var(--module-glow),transparent 68%)}.module-understand{--module-glow:rgba(53,107,255,.3)}.module-learn{--module-glow:rgba(121,79,255,.28)}.module-simulation{--module-glow:rgba(36,186,205,.28)}.module-topline{position:relative;z-index:2;display:flex;justify-content:space-between;align-items:center}.module-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:17px;background:rgba(255,255,255,.72);box-shadow:0 10px 25px rgba(40,71,134,.11)}.module-icon svg{width:25px;color:#2458dd}.module-state{display:flex;align-items:center;gap:8px;padding:5px 10px;color:var(--muted);border-radius:999px;background:rgba(255,255,255,.55);font-size:.71rem;font-weight:760}.state-ready{color:#176c5a;background:rgba(217,250,239,.75)}.state-live{color:#176c5a}.module-number{position:relative;z-index:2;margin-top:62px;color:rgba(37,73,145,.18);font-size:4.7rem;font-weight:880;line-height:.7;letter-spacing:-.08em}.module-card h3{position:relative;z-index:2;margin:22px 0 9px;font-size:2rem;letter-spacing:-.04em}.module-card p{position:relative;z-index:2;margin:0;color:var(--muted)}.module-link{position:absolute;z-index:2;left:25px;right:25px;bottom:25px;display:flex;justify-content:space-between;font-weight:770}.round-arrow{display:grid;place-items:center;width:31px;height:31px;border-radius:50%;background:rgba(44,92,238,.11);color:#285edf}.home-note{margin-top:22px;padding:22px 25px;display:flex;gap:15px;align-items:center;border-radius:22px}.note-icon{display:grid;place-items:center;flex:0 0 44px;height:44px;color:#2860e5;border-radius:14px;background:rgba(255,255,255,.65)}.note-icon svg{width:24px}.home-note p{margin:2px 0 0;color:var(--muted);font-size:.9rem}
.page-hero{border-radius:32px}.compact-hero{padding:38px 42px;display:flex;align-items:center;justify-content:space-between;gap:30px}.compact-hero h1{margin:17px 0 11px;font-size:clamp(2.4rem,5vw,4.3rem);line-height:.98;letter-spacing:-.055em}.compact-hero p{max-width:750px;margin:0;color:var(--muted)}.count-orb{display:grid;place-items:center;flex:0 0 125px;height:125px;color:white;border-radius:50%;background:linear-gradient(145deg,#2764ff,#7650ff);box-shadow:0 24px 55px rgba(62,87,218,.28)}.count-orb strong{font-size:2.8rem;line-height:.8}.count-orb span{font-size:.78rem}.filter-shell{position:sticky;top:86px;z-index:20;margin-top:22px;padding:13px;display:grid;grid-template-columns:1fr 230px;gap:12px;border-radius:21px}.search-control{display:flex;align-items:center;gap:10px;min-height:50px;padding:0 13px;border:1px solid rgba(73,100,151,.12);border-radius:14px;background:rgba(255,255,255,.62)}.search-control svg{width:20px;color:var(--muted)}.search-control input{flex:1;min-width:0;border:0;outline:0;background:transparent;color:var(--ink)}.search-control input::placeholder{color:#8590a5}.search-control kbd{padding:3px 7px;color:var(--muted);border:1px solid var(--line);border-radius:7px;background:rgba(255,255,255,.6);font-size:.7rem}.select-control{display:flex;align-items:center;gap:9px;padding:0 13px;border:1px solid rgba(73,100,151,.12);border-radius:14px;background:rgba(255,255,255,.62)}.select-control span{color:var(--muted);font-size:.74rem;font-weight:730}.select-control select{flex:1;border:0;outline:0;background:transparent;color:var(--ink);font-weight:720}.result-row{display:flex;justify-content:space-between;padding:14px 5px 18px;color:var(--muted);font-size:.82rem}.result-row a{color:#285edf;font-weight:720}.question-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.question-card{min-height:275px;padding:20px;border-radius:24px;display:flex;flex-direction:column;transition:transform .18s ease,box-shadow .18s ease}.question-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}.question-card[hidden]{display:none}.question-card-topline{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between}.question-number{display:inline-flex;align-items:center;justify-content:center;min-width:49px;height:36px;padding:0 11px;color:#174bbd;border-radius:11px;background:rgba(224,234,255,.78);font-weight:850}.question-number.large{min-width:64px;height:45px;font-size:1.08rem}.difficulty{display:inline-flex;width:max-content;padding:5px 9px;border-radius:999px;font-size:.68rem;font-weight:780}.difficulty-easy{color:var(--green);background:rgba(218,249,238,.72)}.difficulty-medium{color:var(--amber);background:rgba(255,240,207,.72)}.difficulty-hard{color:var(--red);background:rgba(255,220,226,.7)}.question-card-body{position:relative;z-index:2}.question-topic{display:block;margin:25px 0 7px;color:#2b62e4;font-size:.72rem;font-weight:820;letter-spacing:.08em;text-transform:uppercase}.question-card h2{margin:0;font-size:1.08rem;line-height:1.42;letter-spacing:-.018em}.question-card-footer{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:23px;color:var(--muted);font-size:.8rem;font-weight:750}.empty-state{padding:55px 20px;text-align:center;border-radius:25px}.empty-state div{font-size:2rem}.empty-state strong{display:block;margin:8px 0}.empty-state p{margin:0;color:var(--muted)}
.breadcrumb{display:flex;align-items:center;gap:8px;margin:2px 4px 17px;color:var(--muted);font-size:.8rem}.breadcrumb a:hover{color:#285edf}.question-hero{padding:34px 38px;border-radius:31px;overflow:hidden}.question-hero::before{content:"";position:absolute;width:420px;height:260px;right:-130px;top:-110px;border-radius:50%;background:radial-gradient(circle,rgba(85,118,255,.23),transparent 68%)}.question-meta-row{position:relative;z-index:2;display:flex;align-items:center;gap:10px}.question-position{color:var(--muted);font-size:.78rem}.question-hero .question-topic{position:relative;z-index:2;margin-top:22px}.question-hero h1{position:relative;z-index:2;max-width:1000px;margin:0;font-size:clamp(2rem,4.5vw,3.7rem);line-height:1.08;letter-spacing:-.048em}.question-top-grid{display:grid;grid-template-columns:1.13fr .87fr;gap:17px;margin-top:17px}.visual-card,.quick-answer,.content-section{border-radius:25px}.visual-card,.quick-answer{padding:24px}.card-heading{position:relative;z-index:2;display:flex;align-items:flex-start;justify-content:space-between;gap:15px}.card-heading h2{margin:0;font-size:1.36rem;letter-spacing:-.025em}.icon-button{width:38px;height:38px;border:1px solid rgba(255,255,255,.8);border-radius:12px;background:rgba(255,255,255,.58);cursor:pointer}.image-button{position:relative;z-index:2;width:100%;margin-top:17px;padding:0;border:0;border-radius:18px;background:transparent;overflow:hidden;cursor:zoom-in}.explanation-image{display:block;width:100%;max-height:640px;object-fit:contain;border-radius:18px;background:rgba(255,255,255,.38)}.explanation-video{position:relative;z-index:2;width:100%;margin-top:17px;border-radius:18px;background:#101827}.quick-answer{display:flex;flex-direction:column}.answer-badge,.tap-hint{display:inline-flex;width:max-content;padding:5px 9px;color:#285edf;border:1px solid rgba(74,112,220,.17);border-radius:999px;background:rgba(230,237,255,.72);font-size:.68rem;font-weight:770}.answer-lead{position:relative;z-index:2;margin:28px 0 30px;font-size:clamp(1.05rem,1.7vw,1.24rem);line-height:1.75;font-weight:650;white-space:pre-line}.quick-actions{position:relative;z-index:2;display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:auto}.compact-button{min-height:45px;padding:9px 12px;font-size:.79rem;border:0;cursor:pointer}.key-points-section,.term-section,.video-section{margin-top:17px;padding:25px}.key-point-grid{position:relative;z-index:2;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:18px}.key-point{display:flex;gap:11px;align-items:flex-start;padding:14px;border:1px solid rgba(255,255,255,.7);border-radius:16px;background:rgba(255,255,255,.48)}.key-point span{display:grid;place-items:center;flex:0 0 24px;height:24px;color:white;border-radius:8px;background:linear-gradient(145deg,#11a77c,#2cc9a0);font-size:.72rem;font-weight:900}.key-point p{margin:0;font-size:.9rem}.detail-grid{display:grid;gap:12px;margin-top:17px}.content-section{padding:25px}.answer-details summary{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:20px;cursor:pointer;list-style:none}.answer-details summary::-webkit-details-marker{display:none}.answer-details summary span{display:grid;font-size:1.25rem;font-weight:780}.answer-details summary small{margin-bottom:4px;color:#2b62e4;font-size:.68rem;letter-spacing:.1em;text-transform:uppercase}.answer-details summary b{font-size:1.2rem;transition:transform .2s}.answer-details[open] summary b{transform:rotate(180deg)}.details-body{position:relative;z-index:2;padding-top:22px;margin-top:19px;border-top:1px solid var(--line)}.long-answer{font-size:.97rem;line-height:1.8;white-space:pre-line}.detail-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}.detail-list li{position:relative;padding-left:25px}.detail-list li::before{content:"→";position:absolute;left:0;color:#2860e5;font-weight:850}.term-cloud{position:relative;z-index:2;display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}.term-button{display:inline-flex;align-items:center;gap:8px;padding:9px 12px;color:#204db4;border:1px solid rgba(73,107,210,.16);border-radius:999px;background:rgba(232,239,255,.65);cursor:pointer;font-weight:710}.term-button span{display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:rgba(44,94,226,.1)}.term-button:hover{color:white;background:linear-gradient(135deg,#2864ff,#7751ff)}.muted-copy{position:relative;z-index:2;color:var(--muted)}.media-placeholder{position:relative;z-index:2;min-height:330px;margin-top:17px;padding:28px;display:grid;place-items:center;align-content:center;text-align:center;border:1px dashed rgba(66,99,163,.22);border-radius:18px;background:rgba(255,255,255,.35)}.media-placeholder span{display:grid;place-items:center;width:55px;height:55px;margin-bottom:12px;color:#2860e5;border-radius:17px;background:rgba(228,237,255,.72);font-size:1.55rem}.media-placeholder p{max-width:480px;margin:7px 0 0;color:var(--muted);font-size:.82rem}.question-navigation{margin-top:17px;padding:16px;display:grid;grid-template-columns:1fr auto 1fr;gap:15px;align-items:center;border-radius:22px}.question-navigation a{position:relative;z-index:2;display:grid;gap:2px}.question-navigation small{color:var(--muted);font-size:.68rem}.question-navigation strong{font-size:.82rem}.question-navigation .next-link{text-align:right}.all-questions-link{padding:8px 12px;border-radius:11px;background:rgba(255,255,255,.58);font-size:.75rem;font-weight:750}.glass-dialog,.image-dialog{padding:0;border:1px solid rgba(255,255,255,.8);border-radius:25px;background:rgba(247,250,255,.8);box-shadow:0 35px 110px rgba(23,46,94,.35);backdrop-filter:blur(30px) saturate(170%)}.glass-dialog::backdrop,.image-dialog::backdrop{background:rgba(15,28,54,.45);backdrop-filter:blur(8px)}.dialog-inner{width:min(660px,calc(100vw - 30px));padding:25px}.dialog-header{display:flex;justify-content:space-between;align-items:flex-start}.dialog-header h2{margin:0;font-size:2rem}.dialog-close,.image-dialog button{display:grid;place-items:center;width:40px;height:40px;padding:0;border:1px solid rgba(79,106,159,.15);border-radius:13px;background:rgba(255,255,255,.65);font-size:1.5rem;cursor:pointer}.translation-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:21px}.translation-grid section{padding:16px;border-radius:16px;background:rgba(255,255,255,.57);border:1px solid rgba(255,255,255,.75)}.translation-grid span{color:#2860e5;font-size:.72rem;font-weight:800}.translation-grid p{margin:8px 0 0}.image-dialog form{position:relative;width:min(1200px,calc(100vw - 24px));max-height:calc(100vh - 24px);padding:10px}.image-dialog button{position:absolute;z-index:2;right:19px;top:19px}.image-dialog img{display:block;width:100%;max-height:calc(100vh - 44px);object-fit:contain;border-radius:18px}.learn-hero{min-height:610px;padding:60px;display:grid;place-items:center;align-content:center;text-align:center;border-radius:36px;overflow:hidden}.learn-orb{display:grid;place-items:center;width:110px;height:110px;margin-bottom:22px;color:white;border-radius:50%;background:linear-gradient(145deg,#2864ff,#7850ff);box-shadow:0 25px 60px rgba(61,85,218,.3)}.learn-orb span{font-size:2.5rem;font-weight:850}.learn-hero h1{max-width:850px;margin:24px 0 14px;font-size:clamp(2.6rem,6vw,5.2rem);line-height:.98;letter-spacing:-.06em}.learn-hero p{max-width:670px;margin:0;color:var(--muted);font-size:1.05rem}.feature-chips{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:27px 0}.feature-chips span{padding:7px 11px;border:1px solid rgba(255,255,255,.8);border-radius:999px;background:rgba(255,255,255,.52);font-size:.77rem;font-weight:730}
@media (prefers-color-scheme:dark){:root{--page:#091326;--page-2:#111127;--ink:#eef4ff;--muted:#aab6cc;--glass:rgba(18,29,52,.63);--glass-strong:rgba(21,32,56,.83);--glass-line:rgba(255,255,255,.11);--line:rgba(209,222,255,.1);--shadow:0 25px 75px rgba(0,0,0,.34),inset 0 1px 0 rgba(255,255,255,.08)}body{background:radial-gradient(circle at 0 0,rgba(39,93,213,.36),transparent 32rem),radial-gradient(circle at 100% 10%,rgba(109,63,219,.28),transparent 34rem),linear-gradient(140deg,#071020,#101126 54%,#071923)}.site-header{background:rgba(8,17,34,.68);border-bottom-color:rgba(255,255,255,.08)}.top-nav,.button-glass,.module-card,.search-control,.select-control{background:rgba(18,29,52,.6)}.top-nav a:hover,.top-nav a.is-active{background:rgba(255,255,255,.09)}.glass-panel{background:linear-gradient(var(--glass-angle),rgba(25,38,66,.82),rgba(14,25,47,.62))}.glass-panel::after{opacity:.12}.brand-mark,.visual-core,.count-orb,.learn-orb{box-shadow:0 24px 65px rgba(0,0,0,.34),inset 0 1px 0 rgba(255,255,255,.18)}.question-number{background:rgba(58,91,169,.25);color:#a9c1ff}.answer-badge,.tap-hint,.term-button{background:rgba(43,74,145,.24);color:#b8c9ff}.key-point,.translation-grid section,.all-questions-link,.media-placeholder{background:rgba(255,255,255,.045)}.glass-dialog,.image-dialog{background:rgba(11,21,40,.9)}}
@media (max-width:1000px){.home-hero{grid-template-columns:1fr}.hero-visual{min-height:300px}.module-grid,.question-grid{grid-template-columns:repeat(2,1fr)}.question-top-grid{grid-template-columns:1fr}.visual-card .explanation-image{max-height:750px}}
@media (max-width:760px){.site-header{padding:10px 14px}.brand-copy small{display:none}.mobile-nav-button{display:block}.top-nav{display:none;position:absolute;top:66px;left:14px;right:14px;padding:8px;flex-direction:column;align-items:stretch;background:rgba(246,250,255,.92);box-shadow:var(--shadow)}.top-nav.is-open{display:flex}.top-nav a{text-align:center}.page-shell{width:min(100% - 20px,1240px);padding-top:22px}.site-footer{width:calc(100% - 24px);flex-direction:column;align-items:flex-start}.home-hero{min-height:auto;padding:30px 22px;border-radius:28px}.home-hero h1{font-size:clamp(3rem,15vw,5rem)}.hero-visual{min-height:260px}.visual-core{width:155px;height:155px}.visual-core span{font-size:3.3rem}.visual-orbit.orbit-one{width:230px;height:230px}.visual-orbit.orbit-two{width:285px;height:285px}.section-intro{padding-top:43px;display:block}.section-intro p{margin-top:10px}.module-grid,.question-grid{grid-template-columns:1fr}.module-card{min-height:340px}.compact-hero{padding:26px;display:block}.count-orb{display:none}.filter-shell{top:70px;grid-template-columns:1fr;padding:9px}.search-control kbd{display:none}.result-row{padding-inline:3px}.question-card{min-height:235px}.question-hero{padding:25px 21px;border-radius:24px}.question-hero h1{font-size:clamp(1.75rem,9vw,2.7rem)}.question-top-grid{gap:12px;margin-top:12px}.visual-card,.quick-answer,.content-section{padding:20px;border-radius:21px}.quick-actions{grid-template-columns:1fr}.key-point-grid{grid-template-columns:1fr}.card-heading{display:block}.card-heading .answer-badge,.card-heading .tap-hint{margin-top:9px}.question-navigation{grid-template-columns:1fr 1fr}.all-questions-link{display:none}.translation-grid{grid-template-columns:1fr}.learn-hero{min-height:560px;padding:35px 22px}.question-meta-row{flex-wrap:wrap}}
@media (max-width:430px){.home-hero h1{font-size:3.15rem}.hero-visual{display:none}.home-hero{min-height:520px;align-content:center}.question-navigation{display:flex;justify-content:space-between}.question-navigation strong{display:none}}

/* Inline translation controls */
.control-center{position:fixed;z-index:80;top:88px;left:14px;width:205px;padding:0;border-radius:20px;overflow:hidden;transition:width .2s ease,transform .2s ease}.control-center-toggle{position:relative;z-index:2;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:9px;width:100%;padding:11px 12px;border:0;background:rgba(255,255,255,.24);cursor:pointer;text-align:left}.control-center-toggle span{display:grid;place-items:center;width:28px;height:28px;border-radius:10px;background:linear-gradient(145deg,#2864ff,#7655ff);color:#fff;font-size:.82rem;font-weight:900}.control-center-toggle b{font-size:.76rem}.control-center-toggle i{font-style:normal;color:var(--muted)}.control-center-body{position:relative;z-index:2;display:grid;gap:8px;padding:5px 12px 13px}.control-center.is-collapsed{width:54px}.control-center.is-collapsed .control-center-toggle{grid-template-columns:1fr;padding:11px}.control-center.is-collapsed .control-center-toggle b,.control-center.is-collapsed .control-center-toggle i,.control-center.is-collapsed .control-center-body{display:none}.control-label{margin-top:2px;color:var(--muted);font-size:.63rem;font-weight:800;letter-spacing:.05em;text-transform:uppercase}.control-select{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:11px;color:var(--ink);background:rgba(255,255,255,.55);outline:none;font-size:.75rem;font-weight:680}.control-help{margin:0;color:var(--muted);font-size:.61rem;line-height:1.4}.theme-switch{display:grid;grid-template-columns:1fr 1fr;gap:5px}.theme-switch button{display:flex;align-items:center;justify-content:center;gap:5px;padding:7px 5px;border:1px solid var(--line);border-radius:10px;background:rgba(255,255,255,.4);cursor:pointer;font-size:.67rem;font-weight:720}.theme-switch button.is-selected{color:white;border-color:transparent;background:linear-gradient(135deg,#2864ff,#7655ff);box-shadow:0 7px 18px rgba(55,83,213,.24)}
.inline-term{display:inline;padding:0 .05em;color:inherit;border:0;border-bottom:1.5px dotted #7655ff;background:transparent;font:inherit;font-weight:inherit;line-height:inherit;cursor:pointer;text-decoration:none;transition:color .15s,background .15s,border-color .15s,box-shadow .15s}.inline-term:hover{color:#6343e7;border-bottom-style:solid}.inline-term.is-translated{display:inline-block;margin:0 .08em;padding:.03em .28em;color:#fff;border:0;border-radius:.38em;background:linear-gradient(135deg,#2864ff,#7655ff);box-shadow:0 5px 14px rgba(59,76,203,.2);font-weight:730}.inline-translation-hint{position:relative;z-index:2;margin:15px 0 0;color:var(--muted);font-size:.76rem}.translatable-copy{white-space:pre-line}

/* Explicit theme selection overrides the operating-system theme. */
html[data-theme="light"]{color-scheme:light;--page:#edf4ff;--page-2:#faf8ff;--ink:#0d1b34;--muted:#64718a;--glass:rgba(255,255,255,.62);--glass-strong:rgba(255,255,255,.79);--glass-line:rgba(255,255,255,.82);--line:rgba(73,100,151,.15);--shadow:0 24px 70px rgba(35,69,132,.14),inset 0 1px 0 rgba(255,255,255,.94)}html[data-theme="light"] body{background:radial-gradient(circle at 0 0,rgba(84,150,255,.38),transparent 32rem),radial-gradient(circle at 100% 12%,rgba(143,102,255,.28),transparent 35rem),radial-gradient(circle at 50% 110%,rgba(69,205,227,.24),transparent 38rem),linear-gradient(140deg,var(--page),var(--page-2) 48%,#effbff)}html[data-theme="light"] .site-header{background:rgba(244,248,255,.62);border-bottom-color:rgba(255,255,255,.76)}html[data-theme="light"] .glass-panel{background:linear-gradient(var(--glass-angle),rgba(255,255,255,.84),rgba(255,255,255,.52))}html[data-theme="light"] .top-nav,html[data-theme="light"] .button-glass,html[data-theme="light"] .module-card,html[data-theme="light"] .search-control,html[data-theme="light"] .select-control{background:rgba(255,255,255,.48)}html[data-theme="light"] .control-select,html[data-theme="light"] .theme-switch button{background:rgba(255,255,255,.55)}
html[data-theme="dark"]{color-scheme:dark;--page:#091326;--page-2:#111127;--ink:#eef4ff;--muted:#aab6cc;--glass:rgba(18,29,52,.63);--glass-strong:rgba(21,32,56,.83);--glass-line:rgba(255,255,255,.11);--line:rgba(209,222,255,.1);--shadow:0 25px 75px rgba(0,0,0,.34),inset 0 1px 0 rgba(255,255,255,.08)}html[data-theme="dark"] body{background:radial-gradient(circle at 0 0,rgba(39,93,213,.36),transparent 32rem),radial-gradient(circle at 100% 10%,rgba(109,63,219,.28),transparent 34rem),linear-gradient(140deg,#071020,#101126 54%,#071923)}html[data-theme="dark"] .site-header{background:rgba(8,17,34,.68);border-bottom-color:rgba(255,255,255,.08)}html[data-theme="dark"] .top-nav,html[data-theme="dark"] .button-glass,html[data-theme="dark"] .module-card,html[data-theme="dark"] .search-control,html[data-theme="dark"] .select-control{background:rgba(18,29,52,.6)}html[data-theme="dark"] .top-nav a:hover,html[data-theme="dark"] .top-nav a.is-active{background:rgba(255,255,255,.09)}html[data-theme="dark"] .glass-panel{background:linear-gradient(var(--glass-angle),rgba(25,38,66,.82),rgba(14,25,47,.62))}html[data-theme="dark"] .glass-panel::after{opacity:.12}html[data-theme="dark"] .question-number{background:rgba(58,91,169,.25);color:#a9c1ff}html[data-theme="dark"] .answer-badge,html[data-theme="dark"] .tap-hint{background:rgba(43,74,145,.24);color:#b8c9ff}html[data-theme="dark"] .key-point,html[data-theme="dark"] .all-questions-link,html[data-theme="dark"] .media-placeholder{background:rgba(255,255,255,.045)}html[data-theme="dark"] .image-dialog{background:rgba(11,21,40,.9)}html[data-theme="dark"] .control-select,html[data-theme="dark"] .theme-switch button,html[data-theme="dark"] .control-center-toggle{background:rgba(255,255,255,.055)}

@media (max-width:1380px){.control-center{top:auto;bottom:14px;left:12px}.control-center:not(.is-collapsed){width:190px}}
@media (max-width:760px){.control-center{top:auto;bottom:10px;left:10px;width:180px;border-radius:17px}.control-center.is-collapsed{width:50px}.control-center-toggle{padding:9px}.control-center-toggle span{width:27px;height:27px}.control-center-body{padding:4px 10px 11px}.inline-translation-hint{font-size:.7rem}}


/* ============================================================
   COMPACT QUESTION WORKSPACE
   Keeps the learner oriented and reduces unnecessary scrolling.
   ============================================================ */

@media (min-width: 1001px) {
    html { font-size: 15px; }
    .header-inner,
    .page-shell,
    .site-footer {
        width: min(1180px, calc(100% - 42px));
    }
    .page-shell {
        padding-top: 24px;
        padding-bottom: 44px;
    }
}

.question-detail-page .site-footer {
    display: none;
}

.question-detail-page .page-shell {
    min-height: calc(100vh - 78px);
}

.question-workspace-toolbar {
    position: sticky;
    z-index: 42;
    top: 78px;
    display: grid;
    grid-template-columns: auto minmax(260px, 1fr);
    align-items: center;
    gap: 18px;
    margin-bottom: 14px;
    padding: 10px 12px;
    border-radius: 19px;
}

.workspace-toolbar-left {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 7px;
}

.workspace-back,
.workspace-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    border: 1px solid var(--line);
    border-radius: 12px;
    color: var(--ink);
    background: var(--surface-control);
    box-shadow: 0 7px 18px var(--soft-shadow);
    font-size: .77rem;
    font-weight: 780;
    transition: transform .15s ease, background .15s ease, border-color .15s ease;
}

.workspace-back {
    gap: 7px;
    padding: 7px 12px;
}

.workspace-arrow {
    width: 38px;
    padding: 0;
    font-size: 1.05rem;
}

.workspace-back:hover,
.workspace-arrow:hover {
    transform: translateY(-1px);
    border-color: var(--accent-line);
    background: var(--surface-control-hover);
}

.workspace-arrow.is-disabled {
    opacity: .35;
    pointer-events: none;
}

.question-progress-control {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: auto minmax(130px, 1fr);
    align-items: center;
    gap: 13px;
}

.question-progress-label {
    display: inline-flex;
    align-items: baseline;
    gap: 4px;
    min-width: 90px;
    color: var(--muted);
    font-size: .72rem;
    font-weight: 720;
    white-space: nowrap;
}

.question-progress-label output {
    color: var(--ink);
    font-size: .95rem;
    font-weight: 850;
}

.question-slider {
    --slider-progress: 0%;
    width: 100%;
    height: 24px;
    margin: 0;
    appearance: none;
    -webkit-appearance: none;
    background: transparent;
    cursor: pointer;
}

.question-slider::-webkit-slider-runnable-track {
    height: 7px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background:
        linear-gradient(90deg, #2a63ff 0, #7655ff var(--slider-progress), var(--slider-track) var(--slider-progress), var(--slider-track) 100%);
    box-shadow: inset 0 1px 2px var(--track-shadow);
}

.question-slider::-moz-range-track {
    height: 7px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--slider-track);
    box-shadow: inset 0 1px 2px var(--track-shadow);
}

.question-slider::-moz-range-progress {
    height: 7px;
    border-radius: 999px;
    background: linear-gradient(90deg, #2a63ff, #7655ff);
}

.question-slider::-webkit-slider-thumb {
    width: 21px;
    height: 21px;
    margin-top: -8px;
    appearance: none;
    -webkit-appearance: none;
    border: 3px solid var(--slider-thumb-border);
    border-radius: 50%;
    background: linear-gradient(145deg, #2a63ff, #7655ff);
    box-shadow: 0 5px 15px rgba(48, 75, 205, .32);
}

.question-slider::-moz-range-thumb {
    width: 17px;
    height: 17px;
    border: 3px solid var(--slider-thumb-border);
    border-radius: 50%;
    background: linear-gradient(145deg, #2a63ff, #7655ff);
    box-shadow: 0 5px 15px rgba(48, 75, 205, .32);
}

.question-dashboard {
    display: grid;
    grid-template-columns: minmax(0, 1.48fr) minmax(330px, .82fr);
    gap: 14px;
    align-items: start;
}

.question-main-column,
.question-side-column {
    display: grid;
    gap: 14px;
    min-width: 0;
}

.compact-question-card,
.compact-visual-card,
.answer-workspace,
.compact-points-card,
.compact-logic-card,
.compact-video-card {
    border-radius: 23px;
}

.compact-question-card {
    padding: 22px 24px;
    overflow: hidden;
}

.compact-question-card::before {
    content: "";
    position: absolute;
    width: 300px;
    height: 210px;
    right: -120px;
    top: -100px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(93, 119, 255, .21), transparent 69%);
}

.compact-question-meta {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.compact-question-card .question-number {
    padding: 7px 11px;
    border-radius: 12px;
    font-size: .82rem;
}

.compact-question-card .question-topic {
    margin: 0;
    color: var(--accent-text);
    font-size: .7rem;
    font-weight: 830;
    letter-spacing: .09em;
    text-transform: uppercase;
}

.compact-question-card h1 {
    position: relative;
    z-index: 2;
    max-width: 920px;
    margin: 15px 0 0;
    font-size: clamp(1.55rem, 2.45vw, 2.35rem);
    line-height: 1.12;
    letter-spacing: -.038em;
}

.compact-question-card .inline-translation-hint {
    margin-top: 10px;
}

.compact-visual-card {
    padding: 16px;
}

.compact-card-heading {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 1px 3px 10px;
}

.compact-card-heading h2 {
    margin: 0;
    font-size: 1.02rem;
    letter-spacing: -.02em;
}

.compact-card-heading .section-kicker {
    margin-bottom: 2px;
    font-size: .61rem;
}

.compact-visual-card .image-button {
    margin-top: 0;
    border-radius: 16px;
}

.compact-visual-card .explanation-image {
    width: 100%;
    max-height: min(67vh, 720px);
    border-radius: 16px;
    background: #fff;
}

.compact-visual-card .explanation-video {
    margin-top: 0;
    max-height: 65vh;
}

.compact-visual-card .media-placeholder {
    min-height: 300px;
    margin-top: 0;
}

.answer-workspace {
    position: sticky;
    top: 145px;
    padding: 17px;
}

.answer-workspace-header {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
}

.answer-workspace-header h2 {
    margin: 1px 0 0;
    font-size: 1.14rem;
    letter-spacing: -.025em;
}

.answer-tabs {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5px;
    margin-top: 14px;
    padding: 4px;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: var(--segmented-bg);
}

.answer-tab {
    min-height: 35px;
    padding: 7px 8px;
    border: 0;
    border-radius: 9px;
    color: var(--muted);
    background: transparent;
    cursor: pointer;
    font-size: .72rem;
    font-weight: 790;
}

.answer-tab.is-active {
    color: var(--segmented-active-text);
    background: var(--segmented-active-bg);
    box-shadow: 0 6px 16px var(--soft-shadow);
}

.answer-panel {
    position: relative;
    z-index: 2;
    margin-top: 12px;
}

.answer-panel[hidden] {
    display: none;
}

.answer-panel-scroll {
    max-height: min(42vh, 390px);
    overflow: auto;
    padding: 1px 6px 1px 1px;
    scrollbar-width: thin;
    scrollbar-color: rgba(89, 110, 172, .35) transparent;
}

.answer-panel .answer-lead {
    margin: 0;
    font-size: .96rem;
    line-height: 1.67;
    font-weight: 640;
}

.answer-panel .long-answer {
    font-size: .89rem;
    line-height: 1.72;
}

.answer-panel-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 7px;
    margin-top: 13px;
}

.answer-panel-actions .button {
    min-height: 40px;
    padding: 8px 9px;
    border-radius: 11px;
    font-size: .7rem;
}

.compact-points-card,
.compact-logic-card,
.compact-video-card {
    padding: 17px;
}

.compact-points-card .key-point-grid {
    grid-template-columns: 1fr;
    gap: 7px;
    margin-top: 12px;
}

.compact-points-card .key-point {
    padding: 10px 11px;
    border-color: var(--card-line);
    background: var(--small-card-bg);
}

.compact-points-card .key-point p {
    font-size: .8rem;
    line-height: 1.45;
}

.compact-logic-card summary {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    list-style: none;
    font-size: .88rem;
    font-weight: 790;
}

.compact-logic-card summary::-webkit-details-marker {
    display: none;
}

.compact-logic-card .details-body {
    padding-top: 13px;
    margin-top: 12px;
}

.compact-logic-card .detail-list {
    gap: 7px;
}

.compact-logic-card .detail-list li {
    font-size: .8rem;
    line-height: 1.5;
}

.compact-video-card {
    margin-top: 14px;
}

.question-mobile-quick-nav {
    display: none;
}

/* Correct, explicit light-mode surfaces. */
html[data-theme="light"] {
    --surface-control: rgba(255,255,255,.72);
    --surface-control-hover: rgba(255,255,255,.96);
    --accent-line: rgba(53,92,218,.33);
    --accent-text: #2457d8;
    --soft-shadow: rgba(38,63,119,.12);
    --track-shadow: rgba(54,73,112,.11);
    --slider-track: rgba(89,111,164,.18);
    --slider-thumb-border: #ffffff;
    --segmented-bg: rgba(81,105,161,.09);
    --segmented-active-bg: #ffffff;
    --segmented-active-text: #153eaa;
    --small-card-bg: rgba(255,255,255,.58);
    --card-line: rgba(87,111,163,.12);
}

html[data-theme="light"] .button-glass,
html[data-theme="light"] .icon-button,
html[data-theme="light"] .control-select,
html[data-theme="light"] .theme-switch button {
    color: #12213d;
    background: rgba(255,255,255,.72);
}

html[data-theme="light"] .answer-workspace,
html[data-theme="light"] .compact-points-card,
html[data-theme="light"] .compact-logic-card {
    color: #0d1b34;
}

html[data-theme="light"] .control-select option {
    color: #0d1b34;
    background: #ffffff;
}

/* Correct, explicit dark-mode surfaces. */
html[data-theme="dark"] {
    --surface-control: rgba(255,255,255,.07);
    --surface-control-hover: rgba(255,255,255,.12);
    --accent-line: rgba(142,167,255,.38);
    --accent-text: #9bb8ff;
    --soft-shadow: rgba(0,0,0,.24);
    --track-shadow: rgba(0,0,0,.28);
    --slider-track: rgba(225,233,255,.13);
    --slider-thumb-border: #17233d;
    --segmented-bg: rgba(255,255,255,.055);
    --segmented-active-bg: rgba(77,110,214,.34);
    --segmented-active-text: #f4f7ff;
    --small-card-bg: rgba(255,255,255,.045);
    --card-line: rgba(255,255,255,.075);
}

html[data-theme="dark"] .button-glass,
html[data-theme="dark"] .icon-button,
html[data-theme="dark"] .control-select,
html[data-theme="dark"] .theme-switch button,
html[data-theme="dark"] .workspace-back,
html[data-theme="dark"] .workspace-arrow {
    color: #eef4ff;
    border-color: rgba(255,255,255,.1);
    background: rgba(255,255,255,.065);
}

html[data-theme="dark"] .button-glass:hover,
html[data-theme="dark"] .workspace-back:hover,
html[data-theme="dark"] .workspace-arrow:hover {
    background: rgba(255,255,255,.11);
}

html[data-theme="dark"] .answer-workspace,
html[data-theme="dark"] .compact-points-card,
html[data-theme="dark"] .compact-logic-card {
    color: #eef4ff;
}

html[data-theme="dark"] .control-select option {
    color: #eef4ff;
    background: #111c32;
}

html[data-theme="dark"] .compact-visual-card .explanation-image {
    box-shadow: 0 10px 35px rgba(0,0,0,.22);
}

@media (max-width: 1000px) {
    .question-workspace-toolbar {
        top: 72px;
    }

    .question-dashboard {
        grid-template-columns: 1fr;
    }

    .answer-workspace {
        position: relative;
        top: auto;
    }

    .question-main-column {
        order: 1;
    }

    .question-side-column {
        order: 2;
    }

    .compact-visual-card .explanation-image {
        max-height: none;
    }

    .answer-panel-scroll {
        max-height: none;
        overflow: visible;
    }
}

@media (max-width: 760px) {
    .question-detail-page .page-shell {
        width: min(100% - 14px, 1180px);
        padding-top: 10px;
    }

    .question-workspace-toolbar {
        position: sticky;
        top: 65px;
        grid-template-columns: 1fr;
        gap: 8px;
        margin-bottom: 9px;
        padding: 8px;
        border-radius: 16px;
    }

    .workspace-toolbar-left {
        justify-content: space-between;
    }

    .workspace-back {
        flex: 1;
        justify-content: flex-start;
    }

    .question-progress-control {
        grid-template-columns: auto 1fr;
        gap: 9px;
        padding: 0 3px 2px;
    }

    .compact-question-card,
    .compact-visual-card,
    .answer-workspace,
    .compact-points-card,
    .compact-logic-card,
    .compact-video-card {
        border-radius: 18px;
    }

    .compact-question-card {
        padding: 18px;
    }

    .compact-question-card h1 {
        margin-top: 12px;
        font-size: clamp(1.4rem, 7vw, 2rem);
    }

    .compact-visual-card {
        padding: 11px;
    }

    .answer-workspace,
    .compact-points-card,
    .compact-logic-card {
        padding: 15px;
    }

    .answer-panel-actions {
        grid-template-columns: 1fr;
    }

    .question-mobile-quick-nav {
        position: sticky;
        z-index: 38;
        bottom: 8px;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 7px;
        margin-top: 12px;
        padding: 7px;
        border-radius: 16px;
    }

    .question-mobile-quick-nav a {
        min-height: 42px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 11px;
        font-size: .76rem;
        font-weight: 780;
    }

    .question-mobile-quick-nav .previous {
        color: var(--ink);
        background: var(--surface-control);
    }

    .question-mobile-quick-nav .next {
        color: #fff;
        background: linear-gradient(135deg, #2864ff, #7655ff);
    }
}

@media (max-width: 430px) {
    .workspace-back span {
        display: none;
    }

    .workspace-back {
        flex: 0 0 38px;
        padding: 0;
    }

    .question-progress-label {
        min-width: 75px;
        font-size: .66rem;
    }

    .compact-question-card .inline-translation-hint {
        display: none;
    }
}


/* ============================================================
   STRUCTURED LAP ANSWERS
   ============================================================ */

.answer-coverage-note {
    margin: 0 0 12px;
    padding: 10px 12px;
    border: 1px solid var(--accent-line);
    border-radius: 12px;
    color: var(--muted);
    background:
        linear-gradient(135deg, rgba(52, 101, 255, .09), rgba(119, 84, 255, .06));
    font-size: .73rem;
    font-weight: 650;
    line-height: 1.45;
}

.exam-answer-list {
    display: grid;
    gap: 9px;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: exam-answer;
}

.exam-answer-item {
    position: relative;
    display: grid;
    grid-template-columns: 29px minmax(0, 1fr);
    align-items: start;
    gap: 10px;
    padding: 11px 12px;
    border: 1px solid var(--card-line);
    border-radius: 14px;
    background: var(--small-card-bg);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.04);
}

.exam-answer-item:hover {
    border-color: var(--accent-line);
}

.exam-answer-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 27px;
    height: 27px;
    margin-top: 1px;
    border-radius: 9px;
    color: #fff;
    background: linear-gradient(145deg, #2d67ff, #7656ff);
    box-shadow: 0 5px 13px rgba(54, 78, 200, .24);
    font-size: .69rem;
    font-weight: 850;
}

.exam-answer-item p {
    margin: 0;
    color: var(--ink);
    font-size: .84rem;
    font-weight: 590;
    line-height: 1.55;
}

.full-answer-paragraphs {
    display: grid;
    gap: 10px;
}

.full-answer-paragraph {
    margin: 0;
    padding: 12px 13px;
    border-left: 3px solid rgba(89, 112, 230, .52);
    border-radius: 0 12px 12px 0;
    color: var(--ink);
    background: var(--small-card-bg);
    font-size: .87rem;
    line-height: 1.68;
}

html[data-theme="light"] .exam-answer-item,
html[data-theme="light"] .full-answer-paragraph {
    box-shadow: 0 6px 18px rgba(48, 71, 125, .055);
}

html[data-theme="dark"] .answer-coverage-note {
    color: #c8d4ed;
    background:
        linear-gradient(135deg, rgba(60, 103, 239, .14), rgba(121, 82, 255, .09));
}

html[data-theme="dark"] .exam-answer-item p,
html[data-theme="dark"] .full-answer-paragraph {
    color: #eef4ff;
}

@media (min-width: 1001px) {
    .answer-panel-scroll {
        max-height: min(53vh, 520px);
    }
}

@media (max-width: 760px) {
    .exam-answer-item {
        grid-template-columns: 27px minmax(0, 1fr);
        gap: 9px;
        padding: 10px;
    }

    .exam-answer-item p {
        font-size: .82rem;
    }

    .full-answer-paragraph {
        padding: 11px 12px;
        font-size: .84rem;
    }
}


/* ============================================================
   LEARN + SIMULATION V1
   ============================================================ */
.learn-page .page-shell,.simulation-page .page-shell,.flashcards-page .page-shell{width:min(1180px,calc(100% - 42px));padding-top:24px}.learn-page .site-footer,.simulation-page .site-footer,.flashcards-page .site-footer{display:none}
.study-hero{display:grid;grid-template-columns:1fr auto;align-items:center;gap:35px;padding:38px 42px;border-radius:30px;overflow:hidden}.study-hero-copy{position:relative;z-index:2}.study-hero h1,.simulation-setup-hero h1{margin:18px 0 14px;font-size:clamp(2.6rem,5vw,4.7rem);line-height:.94;letter-spacing:-.055em}.study-hero h1 span,.simulation-setup-hero h1 span{color:transparent;background:linear-gradient(105deg,#245dff,#7655ff,#22a7d4);background-clip:text;-webkit-background-clip:text}.study-hero p,.simulation-setup-hero p{max-width:720px;margin:0;color:var(--muted);font-size:1rem}.study-hero-actions{display:flex;gap:9px;margin-top:23px}.study-ring{position:relative;z-index:2;display:grid;place-items:center;width:190px;height:190px}.study-ring svg{position:absolute;inset:0;transform:rotate(-90deg)}.study-ring circle{fill:none;stroke:var(--line);stroke-width:9}.study-ring .study-ring-value{stroke:url(#none);stroke:#5b61f4;stroke-linecap:round;stroke-dasharray:308;stroke-dashoffset:308;transition:stroke-dashoffset .6s ease}.study-ring strong{font-size:2.4rem;letter-spacing:-.05em}.study-ring span{margin-top:53px;color:var(--muted);font-size:.75rem;font-weight:750}.study-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:14px}.study-stat{position:relative;padding:18px 20px;border-radius:20px}.study-stat span{display:block;color:var(--muted);font-size:.71rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em}.study-stat strong{display:block;margin-top:8px;font-size:2rem;line-height:1}.study-stat small{color:var(--muted);font-size:.7rem}.study-section-intro{padding-top:42px}.study-mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.study-mode-card{position:relative;z-index:1;min-height:235px;padding:21px;text-align:left;border-radius:23px;cursor:pointer;overflow:hidden}.study-mode-card:hover{transform:translateY(-3px)}.study-mode-icon{display:grid;place-items:center;width:43px;height:43px;border-radius:14px;color:#fff;background:linear-gradient(145deg,#2b64ff,#7655ff);font-size:1.1rem;font-weight:900}.study-mode-card small{display:block;margin-top:25px;color:var(--accent-text,#2457d8);font-size:.68rem;font-weight:820;text-transform:uppercase;letter-spacing:.08em}.study-mode-card h3{margin:7px 0 7px;font-size:1.2rem}.study-mode-card p{margin:0;color:var(--muted);font-size:.78rem}.study-mode-card b{position:absolute;left:21px;bottom:18px;font-size:.74rem}.ticket-workspace,.weak-preview{margin-top:16px;padding:27px;border-radius:27px}.ticket-workspace-head{position:relative;z-index:2;display:flex;align-items:flex-start;justify-content:space-between;gap:25px}.ticket-workspace h2{margin:0;font-size:1.65rem}.ticket-workspace p{max-width:740px;margin:7px 0 0;color:var(--muted);font-size:.82rem}.ticket-grid{position:relative;z-index:2;display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:20px}.ticket-card{display:flex;justify-content:space-between;gap:12px;padding:16px;border:1px solid var(--card-line);border-radius:17px;background:var(--small-card-bg)}.ticket-card span{color:var(--muted);font-size:.6rem;font-weight:820;text-transform:uppercase}.ticket-card h3{margin:4px 0;font-size:1rem}.ticket-card p{margin:0;font-size:.7rem}.ticket-card-actions{display:grid;align-content:center;gap:5px}.ticket-card-actions button{padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:var(--surface-control);cursor:pointer;font-size:.66rem;font-weight:750}.empty-state{position:relative;z-index:2;margin-top:18px;padding:24px;text-align:center;border:1px dashed var(--line);border-radius:18px}.empty-state p{margin:5px auto 0}.weak-preview .compact-card-heading{padding:0}.button-small{min-height:36px;padding:7px 11px;font-size:.7rem}.weak-question-list{position:relative;z-index:2;display:grid;gap:7px;margin-top:12px}.weak-question-row{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:11px;padding:10px 12px;border:1px solid var(--card-line);border-radius:13px;color:var(--ink);background:var(--small-card-bg);cursor:pointer;text-align:left}.weak-question-row>span{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;color:#fff;background:linear-gradient(145deg,#ef715f,#b93257);font-size:.66rem;font-weight:850}.weak-question-row strong,.weak-question-row small{display:block}.weak-question-row strong{font-size:.8rem}.weak-question-row small{color:var(--muted);font-size:.66rem}.empty-inline{padding:18px;color:var(--muted);text-align:center;font-size:.78rem}.ticket-dialog{width:min(760px,calc(100% - 24px));max-height:90vh;padding:0;border:0;background:transparent}.ticket-dialog::backdrop{background:rgba(5,12,27,.66);backdrop-filter:blur(7px)}.ticket-dialog-card{padding:24px;border-radius:25px}.ticket-dialog-head{position:relative;z-index:2;display:flex;justify-content:space-between;align-items:start}.ticket-dialog h2{margin:0}.dialog-close{width:37px;height:37px;border:1px solid var(--line);border-radius:11px;background:var(--surface-control);cursor:pointer;font-size:1.2rem}.field-label{position:relative;z-index:2;display:block;margin:15px 0 6px;color:var(--muted);font-size:.67rem;font-weight:820;text-transform:uppercase;letter-spacing:.07em}.study-input{position:relative;z-index:2;width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:12px;color:var(--ink);background:var(--surface-control);outline:none}.ticket-question-picker{position:relative;z-index:2;display:grid;gap:5px;max-height:340px;margin-top:8px;overflow:auto}.ticket-picker-row{display:grid;grid-template-columns:auto auto 1fr;align-items:center;gap:10px;padding:9px;border:1px solid var(--card-line);border-radius:11px;background:var(--small-card-bg);cursor:pointer}.ticket-picker-row>span{font-size:.65rem;font-weight:850}.ticket-picker-row strong,.ticket-picker-row small{display:block}.ticket-picker-row strong{font-size:.76rem}.ticket-picker-row small{color:var(--muted);font-size:.64rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.ticket-dialog-actions{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;margin-top:15px;color:var(--muted);font-size:.7rem}

.study-toolbar,.exam-toolbar{position:sticky;z-index:40;top:77px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:16px;padding:9px 11px;border-radius:18px}.study-toolbar-progress,.exam-progress{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:10px;color:var(--muted);font-size:.7rem}.study-progress-track{height:6px;overflow:hidden;border-radius:99px;background:var(--slider-track,rgba(89,111,164,.18))}.study-progress-track i{display:block;width:0;height:100%;border-radius:99px;background:linear-gradient(90deg,#2864ff,#7655ff);transition:width .25s ease}.flashcard-workspace{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(360px,.75fr);gap:14px;margin-top:13px;align-items:start}.flash-question-column{display:grid;gap:13px}.flash-question-card,.flash-image-card,.flash-answer-card,.study-complete{border-radius:24px}.flash-question-card{padding:23px}.flash-question-card h1{margin:15px 0 0;font-size:clamp(1.7rem,3vw,2.7rem);line-height:1.12;letter-spacing:-.04em}.flash-last-study{margin-left:auto;color:var(--muted);font-size:.65rem}.flash-image-card{padding:12px}.flash-image-card img{display:block;width:100%;max-height:64vh;object-fit:contain;border-radius:15px;background:#fff}.flash-answer-card{position:sticky;top:142px;min-height:470px;padding:18px}.flash-answer-hidden{position:relative;z-index:2;display:grid;place-items:center;min-height:430px;text-align:center}.reveal-symbol{display:grid;place-items:center;width:76px;height:76px;border-radius:24px;color:#fff;background:linear-gradient(145deg,#2864ff,#7655ff);font-size:2rem;font-weight:900;box-shadow:0 18px 40px rgba(55,82,214,.27)}.flash-answer-hidden h2{margin:18px 0 6px}.flash-answer-hidden p{max-width:340px;margin:0 0 20px;color:var(--muted);font-size:.82rem}.flash-answer-content{position:relative;z-index:2}.flash-answer-content .exam-answer-list{max-height:48vh;overflow:auto;padding-right:4px}.flash-full-answer{margin-top:10px;padding:11px;border:1px solid var(--line);border-radius:13px;background:var(--small-card-bg)}.flash-full-answer summary{display:flex;justify-content:space-between;cursor:pointer;font-size:.75rem;font-weight:780}.flash-full-answer>div{display:grid;gap:8px;margin-top:10px}.flash-rating-label{margin:14px 0 7px;color:var(--muted);font-size:.67rem;font-weight:780}.flash-rating-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px}.flash-rating-grid button{padding:9px;border:1px solid var(--line);border-radius:11px;color:var(--ink);background:var(--surface-control);cursor:pointer;text-align:left}.flash-rating-grid strong,.flash-rating-grid small{display:block}.flash-rating-grid strong{font-size:.72rem}.flash-rating-grid small{color:var(--muted);font-size:.58rem}.flash-rating-grid button:nth-child(1){border-color:rgba(209,56,76,.25)}.flash-rating-grid button:nth-child(4){border-color:rgba(22,153,110,.28)}.verbal-practice-link{width:100%;margin-top:8px;padding:9px;border:0;color:var(--accent-text);background:transparent;cursor:pointer;font-size:.7rem;font-weight:780}.study-complete{display:grid;place-items:center;min-height:520px;margin-top:13px;padding:40px;text-align:center}.complete-check{display:grid;place-items:center;width:80px;height:80px;border-radius:50%;color:#fff;background:linear-gradient(145deg,#1aaa7f,#38caa0);font-size:2rem}.study-complete h1{margin:18px 0 5px;font-size:2.5rem}.study-complete p{margin:0 0 18px;color:var(--muted)}.study-complete>div{display:flex;gap:8px}

.simulation-setup{display:grid;gap:14px}.simulation-setup-hero{display:grid;grid-template-columns:1fr auto;align-items:center;gap:30px;padding:38px 42px;border-radius:30px}.exam-seal{display:grid;place-items:center;width:180px;height:180px;border:1px solid rgba(255,255,255,.4);border-radius:50%;color:#fff;background:linear-gradient(145deg,#2764ff,#7451ff);box-shadow:0 30px 65px rgba(48,72,200,.27)}.exam-seal strong{font-size:3rem;line-height:.9}.exam-seal span{margin-top:-34px;font-size:.7rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.simulation-config-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.simulation-config-card{padding:24px;border-radius:25px}.config-step{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;color:#fff;background:linear-gradient(145deg,#2864ff,#7655ff);font-weight:850}.simulation-config-card h2{margin:12px 0 14px}.config-choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px}.config-choice{display:grid;padding:12px;border:1px solid var(--line);border-radius:13px;background:var(--small-card-bg);cursor:pointer}.config-choice input{position:absolute;opacity:0}.config-choice.is-selected{border-color:var(--accent-line);background:linear-gradient(135deg,rgba(41,101,255,.13),rgba(118,85,255,.09))}.config-choice strong,.config-choice small{display:block}.config-choice strong{font-size:.78rem}.config-choice small{color:var(--muted);font-size:.63rem}.range-setting{display:grid;gap:9px;margin-bottom:15px}.range-setting span{display:flex;justify-content:space-between}.range-setting output{color:var(--accent-text);font-weight:850}.range-setting input{width:100%;accent-color:#5b60ee}.toggle-setting{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:11px 0;border-top:1px solid var(--line)}.toggle-setting span{display:grid}.toggle-setting b{font-size:.76rem}.toggle-setting small{color:var(--muted);font-size:.62rem}.toggle-setting input{position:absolute;opacity:0}.toggle-setting i{position:relative;width:42px;height:24px;border-radius:99px;background:var(--slider-track);transition:.2s}.toggle-setting i::after{content:"";position:absolute;width:18px;height:18px;left:3px;top:3px;border-radius:50%;background:#fff;box-shadow:0 2px 6px rgba(0,0,0,.2);transition:.2s}.toggle-setting input:checked+i{background:linear-gradient(90deg,#2864ff,#7655ff)}.toggle-setting input:checked+i::after{transform:translateX(18px)}.simulation-start-button{display:grid;place-items:center;width:100%;padding:17px;border:0;border-radius:20px;color:#fff;background:linear-gradient(135deg,#245fff,#7655ff);box-shadow:0 18px 38px rgba(47,72,202,.26);cursor:pointer}.simulation-start-button span{font-size:1rem;font-weight:850}.simulation-start-button small{opacity:.75;font-size:.65rem}.exam-toolbar{grid-template-columns:auto 1fr auto}.exam-timer{padding:7px 10px;border:1px solid var(--line);border-radius:10px;background:var(--surface-control);font-variant-numeric:tabular-nums;font-size:.75rem;font-weight:800}.exam-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(340px,.8fr);gap:14px;margin-top:13px}.exam-question-card,.recorder-card,.immediate-feedback{border-radius:25px}.exam-question-card{display:grid;align-content:start;min-height:570px;padding:28px}.exam-question-card h1{margin:22px 0;font-size:clamp(2rem,4vw,3.8rem);line-height:1.08;letter-spacing:-.05em}.exam-state{margin-left:auto;padding:5px 9px;border-radius:99px;color:var(--accent-text);background:var(--small-card-bg);font-size:.62rem;font-weight:820}.exam-question-image{width:100%;max-height:370px;object-fit:contain;margin-top:auto;border-radius:16px;background:#fff}.recorder-card{position:sticky;top:143px;display:grid;place-items:center;min-height:570px;padding:23px;text-align:center}.recorder-status{display:grid;place-items:center}.recorder-status strong,.recorder-status small{display:block}.recorder-status small{max-width:330px;margin-top:4px;color:var(--muted);font-size:.7rem}.recorder-dot{width:8px;height:8px;margin-bottom:8px;border-radius:50%;background:#1bb785;box-shadow:0 0 0 6px rgba(27,183,133,.12)}.recorder-dot.is-error{background:#d83f59;box-shadow:0 0 0 6px rgba(216,63,89,.12)}.microphone-orb{position:relative;display:grid;place-items:center;width:150px;height:150px;margin:24px 0 8px;border-radius:50%;background:linear-gradient(145deg,rgba(44,100,255,.15),rgba(118,85,255,.12));border:1px solid var(--accent-line)}.microphone-orb>span{font-size:2.6rem}.sound-ring{position:absolute;inset:0;border:2px solid rgba(73,100,255,.25);border-radius:50%;opacity:0}.microphone-orb.is-recording .sound-ring{animation:soundPulse 1.5s infinite}.microphone-orb.is-recording .ring-b{animation-delay:.65s}@keyframes soundPulse{0%{transform:scale(.92);opacity:.8}100%{transform:scale(1.45);opacity:0}}.recording-time{font-variant-numeric:tabular-nums;font-size:1.2rem;font-weight:850}.record-button{min-width:210px;margin-top:12px;padding:13px 18px;border:0;border-radius:14px;color:#fff;background:linear-gradient(135deg,#2864ff,#7655ff);box-shadow:0 12px 28px rgba(54,79,211,.24);cursor:pointer;font-weight:830}.processing-state{display:grid;place-items:center;gap:5px;margin:20px}.processing-state>span{width:34px;height:34px;border:4px solid var(--line);border-top-color:#6659f1;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.processing-state small{color:var(--muted);font-size:.65rem}.typed-fallback{width:100%;margin-top:12px;padding:9px;border:1px solid var(--line);border-radius:12px;text-align:left}.typed-fallback summary{cursor:pointer;color:var(--muted);font-size:.66rem}.typed-fallback textarea{width:100%;margin:8px 0;padding:9px;border:1px solid var(--line);border-radius:9px;color:var(--ink);background:var(--surface-control);resize:vertical}.exam-secondary-actions{display:flex;gap:13px;margin-top:13px}.exam-secondary-actions button{border:0;color:var(--muted);background:transparent;cursor:pointer;font-size:.67rem}.immediate-feedback{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:13px;padding:18px 22px}.immediate-feedback h2{margin:0;font-size:2rem}.immediate-feedback p{flex:1;margin:0;color:var(--muted);font-size:.78rem}.results-hero{display:grid;grid-template-columns:1fr auto;align-items:center;gap:30px;padding:36px;border-radius:28px}.results-hero h1{margin:16px 0 7px;font-size:2.8rem}.results-hero p{margin:0;color:var(--muted)}.results-score{display:grid;place-items:center;width:165px;height:165px;border-radius:50%;color:#fff;background:linear-gradient(145deg,#2864ff,#7655ff);box-shadow:0 25px 55px rgba(49,72,197,.28)}.results-score strong{font-size:2.5rem}.results-score span{margin-top:-35px;font-size:.7rem}.results-list{display:grid;gap:8px;margin-top:13px}.result-card{border-radius:18px}.result-card summary{position:relative;z-index:2;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:14px;cursor:pointer;list-style:none}.result-card summary::-webkit-details-marker{display:none}.result-card summary>span{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;color:#fff;background:#60708f;font-size:.7rem;font-weight:850}.result-card.is-good summary>span{background:#159473}.result-card.is-medium summary>span{background:#c28118}.result-card.is-weak summary>span{background:#c64057}.result-card summary strong,.result-card summary small{display:block}.result-card summary small{color:var(--muted);font-size:.64rem}.result-card summary>b{font-size:1.1rem}.result-card-body{position:relative;z-index:2;padding:0 16px 16px;border-top:1px solid var(--line)}.result-card-body h3{margin:13px 0 4px;font-size:.72rem}.result-card-body p,.result-card-body blockquote{margin:0;color:var(--muted);font-size:.7rem}.result-card-body blockquote{padding:9px;border-radius:10px;background:var(--small-card-bg)}.results-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:13px;padding:13px;border-radius:19px}

html[data-theme="dark"] .study-mode-card,html[data-theme="dark"] .simulation-config-card,html[data-theme="dark"] .flash-answer-card,html[data-theme="dark"] .recorder-card{color:#eef4ff}html[data-theme="dark"] .study-input{color:#eef4ff;background:rgba(255,255,255,.06)}html[data-theme="dark"] .study-input option{color:#eef4ff;background:#111c32}
@media(max-width:1000px){.study-mode-grid{grid-template-columns:1fr 1fr}.ticket-grid{grid-template-columns:1fr 1fr}.flashcard-workspace,.exam-grid{grid-template-columns:1fr}.flash-answer-card,.recorder-card{position:relative;top:auto}.simulation-config-grid{grid-template-columns:1fr}.exam-question-card{min-height:auto}.recorder-card{min-height:500px}}
@media(max-width:760px){.learn-page .page-shell,.simulation-page .page-shell,.flashcards-page .page-shell{width:min(100% - 14px,1180px);padding-top:10px}.study-hero,.simulation-setup-hero{grid-template-columns:1fr;padding:24px;border-radius:21px}.study-hero h1,.simulation-setup-hero h1{font-size:2.65rem}.study-ring,.exam-seal{display:none}.study-stats{grid-template-columns:1fr 1fr}.study-stat{padding:14px}.study-mode-grid{grid-template-columns:1fr}.study-mode-card{min-height:190px}.ticket-workspace,.weak-preview{padding:17px;border-radius:20px}.ticket-workspace-head{display:block}.ticket-workspace-head .button{margin-top:14px}.ticket-grid{grid-template-columns:1fr}.study-toolbar,.exam-toolbar{top:65px;grid-template-columns:auto 1fr auto;gap:8px}.study-toolbar .button-small{display:none}.study-toolbar-progress,.exam-progress{grid-template-columns:1fr}.study-toolbar-progress>span,.exam-progress>span{font-size:.62rem}.flashcard-workspace{margin-top:8px}.flash-question-card,.flash-image-card,.flash-answer-card{border-radius:18px}.flash-question-card{padding:17px}.flash-question-card h1{font-size:1.55rem}.flash-answer-card{min-height:430px;padding:14px}.flash-answer-hidden{min-height:390px}.flash-rating-grid{grid-template-columns:1fr 1fr}.simulation-config-card{padding:18px;border-radius:20px}.config-choice-grid{grid-template-columns:1fr}.exam-grid{margin-top:8px}.exam-question-card,.recorder-card{padding:18px;border-radius:19px}.exam-question-card h1{font-size:2rem}.exam-question-image{max-height:280px}.immediate-feedback{display:grid}.results-hero{grid-template-columns:1fr;padding:24px}.results-score{width:130px;height:130px}.results-actions{display:grid;grid-template-columns:1fr}.results-actions .button{width:100%}.control-center{z-index:35}}

/* ============================================================
   CLOSED ACCOUNT SYSTEM + ADMIN DASHBOARD
   ============================================================ */
.account-menu {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-left: auto;
}

.account-menu form { margin: 0; }

.account-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px 6px 6px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    background: var(--surface-control);
    text-decoration: none;
}

.account-chip > span,
.admin-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 31px;
    height: 31px;
    border-radius: 50%;
    color: #fff;
    background: linear-gradient(145deg, #2864ff, #7956ff);
    font-weight: 850;
}

.account-chip b {
    max-width: 130px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: .73rem;
}

.account-logout {
    width: 38px;
    height: 38px;
    border: 1px solid var(--line);
    border-radius: 50%;
    color: var(--ink);
    background: var(--surface-control);
    cursor: pointer;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background: #081225;
}

.login-shell {
    position: relative;
    z-index: 2;
    width: min(1040px, 100%);
    display: grid;
    grid-template-columns: 1.15fr .85fr;
    gap: 18px;
}

.login-brand-panel,
.login-card {
    padding: clamp(28px, 5vw, 58px);
    border-radius: 32px;
}

.login-brand-panel {
    min-height: 610px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.login-brand-panel h1 {
    margin: 16px 0;
    font-size: clamp(2.5rem, 5vw, 4.8rem);
    line-height: .96;
    letter-spacing: -.06em;
}

.login-brand-panel h1 span { color: #91adff; }
.login-lock { font-size: 2.3rem; }

.login-features {
    display: grid;
    gap: 10px;
    color: var(--muted);
}

.login-card { align-self: center; }
.login-brand { margin-bottom: 32px; }

.login-card h2,
.account-form-card h1 {
    margin: 0 0 8px;
    font-size: 2rem;
}

.login-card > p,
.account-form-card > p { color: var(--muted); }

.login-card form,
.account-form {
    display: grid;
    gap: 15px;
    margin-top: 24px;
}

.login-card label,
.account-form label {
    display: grid;
    gap: 7px;
    color: var(--muted);
    font-size: .74rem;
    font-weight: 780;
}

.login-card input,
.account-form input,
.account-form select {
    width: 100%;
    min-height: 48px;
    padding: 10px 13px;
    border: 1px solid var(--line);
    border-radius: 13px;
    color: var(--ink);
    background: var(--surface-control);
    font: inherit;
}

.login-help {
    display: block;
    margin-top: 18px;
    color: var(--muted);
}

.form-alert {
    position: relative;
    z-index: 3;
    margin: 0 0 14px;
    padding: 12px 14px;
    border-radius: 13px;
    font-size: .82rem;
    font-weight: 690;
}

.form-alert.is-error {
    color: #a4172b;
    border: 1px solid rgba(255, 67, 94, .22);
    background: rgba(255, 67, 94, .12);
}

.form-alert.is-success {
    color: #08703d;
    border: 1px solid rgba(22, 190, 107, .22);
    background: rgba(22, 190, 107, .12);
}

html[data-theme="dark"] .form-alert.is-error { color: #ff9aaa; }
html[data-theme="dark"] .form-alert.is-success { color: #80e8b2; }

.account-form-card {
    width: min(620px, 100%);
    margin: 30px auto;
    padding: 30px;
    border-radius: 26px;
}

.account-hero,
.admin-hero,
.admin-profile-hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 28px;
    border-radius: 28px;
}

.account-hero h1,
.admin-hero h1,
.admin-profile-hero h1 {
    margin: 5px 0;
    font-size: clamp(2rem, 4vw, 3.4rem);
}

.account-history,
.admin-users,
.admin-section {
    margin-top: 16px;
    padding: 22px;
    border-radius: 24px;
}

.account-run-list {
    display: grid;
    gap: 8px;
    margin-top: 12px;
}

.account-run-list > div {
    display: grid;
    grid-template-columns: 100px 80px 1fr;
    gap: 12px;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--card-line);
    border-radius: 13px;
    background: var(--small-card-bg);
}

.admin-users-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.admin-users-head .study-input { width: min(320px, 100%); }

.admin-user-list {
    display: grid;
    gap: 8px;
    margin-top: 14px;
}

.admin-user-row {
    display: grid;
    grid-template-columns: 42px minmax(180px, 1fr) auto 72px;
    gap: 12px;
    align-items: center;
    padding: 12px;
    border: 1px solid var(--card-line);
    border-radius: 15px;
    color: var(--ink);
    background: var(--small-card-bg);
    text-decoration: none;
}

.admin-user-row:hover { border-color: var(--accent-line); }
.admin-user-row.is-disabled { opacity: .55; }
.admin-user-row small { display: block; color: var(--muted); }

.admin-user-metrics {
    display: flex;
    gap: 7px;
}

.admin-user-metrics span {
    padding: 6px 8px;
    border-radius: 9px;
    background: var(--surface-control);
    font-size: .68rem;
}

.admin-user-row > b {
    color: var(--accent-text);
    font-size: .7rem;
}

.admin-avatar.is-large {
    width: 64px;
    height: 64px;
    font-size: 1.35rem;
}

.admin-profile-hero { justify-content: flex-start; }
.admin-profile-actions { margin-left: auto; }
.admin-back { margin-bottom: 12px; }

.admin-detail-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(280px, .7fr);
    gap: 16px;
}

.admin-side-stack { display: grid; gap: 16px; }

.progress-admin-table { display: grid; gap: 7px; }

.progress-admin-table > div {
    display: grid;
    grid-template-columns: 46px minmax(0, 1fr) 56px;
    gap: 10px;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid var(--card-line);
}

.progress-admin-table small { display: block; color: var(--muted); }

.danger-zone { border-color: rgba(255, 65, 89, .25); }

.danger-zone button {
    width: 100%;
    min-height: 43px;
    border: 1px solid rgba(255, 65, 89, .3);
    border-radius: 12px;
    color: #d92742;
    background: rgba(255, 65, 89, .09);
    cursor: pointer;
}

.admin-simulation-list { display: grid; gap: 9px; }

.admin-simulation-list details {
    border: 1px solid var(--card-line);
    border-radius: 14px;
    background: var(--small-card-bg);
}

.admin-simulation-list summary {
    display: grid;
    grid-template-columns: 100px 70px 1fr;
    gap: 12px;
    padding: 13px;
    cursor: pointer;
}

.admin-simulation-list details > div {
    display: grid;
    gap: 8px;
    padding: 0 13px 13px;
}

.admin-simulation-list article {
    padding: 12px;
    border-radius: 11px;
    background: var(--surface-control);
}

.admin-simulation-list article header {
    display: flex;
    justify-content: space-between;
}

.admin-simulation-list article p {
    margin: 7px 0 0;
    font-size: .8rem;
    line-height: 1.5;
}

.account-load-error::before {
    content: "Kontodaten konnten nicht geladen werden.";
    position: fixed;
    z-index: 9999;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 14px;
    border-radius: 12px;
    color: #fff;
    background: #c52b46;
}

@media (max-width: 900px) {
    .login-shell { grid-template-columns: 1fr; }
    .login-brand-panel { display: none; }
    .login-card { width: min(520px, 100%); margin: auto; }
    .account-chip b { display: none; }
    .admin-detail-grid { grid-template-columns: 1fr; }
    .admin-user-row { grid-template-columns: 42px 1fr 60px; }
    .admin-user-metrics { display: none; }
}

@media (max-width: 700px) {
    .account-menu { margin-left: 0; }
    .account-logout { display: none; }
    .account-hero,
    .admin-hero,
    .admin-profile-hero {
        align-items: flex-start;
        flex-direction: column;
    }
    .admin-profile-actions { width: 100%; margin-left: 0; }
    .admin-profile-actions button { width: 100%; }
    .admin-users-head { align-items: stretch; flex-direction: column; }
    .admin-user-row { grid-template-columns: 38px 1fr 55px; }
    .account-run-list > div { grid-template-columns: 80px 60px 1fr; }
    .login-page { padding: 10px; }
    .login-card { padding: 25px; border-radius: 24px; }
}
.admin-check {
    display: grid !important;
    grid-template-columns: 20px 1fr;
    align-items: center;
    gap: 9px !important;
    padding: 10px 11px;
    border: 1px solid var(--card-line);
    border-radius: 12px;
    background: var(--small-card-bg);
}
.admin-check input {
    width: 18px !important;
    min-height: 18px !important;
    margin: 0;
}
.admin-ticket-list { display: grid; gap: 7px; margin-top: 12px; }
.admin-ticket-list > div {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 11px;
    border: 1px solid var(--card-line);
    border-radius: 11px;
    background: var(--small-card-bg);
}
.admin-ticket-list small { color: var(--muted); }


/* ============================================================
   MOBILE-FIRST PWA + FEEDBACK UPDATE
   ============================================================ */
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{min-height:100dvh;overscroll-behavior-y:none}.button,button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}.button,button{touch-action:manipulation}.mobile-tabbar,.install-dialog{display:none}.footer-actions{display:flex;gap:14px;align-items:center}.footer-actions button,.footer-actions a{border:0;color:var(--muted);background:transparent;font:inherit;font-size:.72rem;text-decoration:none;cursor:pointer}.reveal-item{opacity:0;transform:translateY(14px);transition:opacity .42s ease var(--reveal-delay),transform .42s cubic-bezier(.2,.75,.25,1) var(--reveal-delay)}.reveal-item.is-revealed{opacity:1;transform:none}.button:active,.module-card:active,.study-mode-card:active{transform:scale(.98)}
.install-dialog{width:min(100% - 24px,520px);max-width:none;border:0;padding:0;background:transparent}.install-dialog::backdrop{background:rgba(3,10,24,.62);backdrop-filter:blur(8px)}.install-sheet{position:relative;padding:30px;border-radius:28px;text-align:center}.install-sheet>img{width:88px;height:88px;border-radius:22px;box-shadow:0 16px 45px rgba(25,67,196,.34)}.install-sheet h2{font-size:1.8rem;margin:14px 0 8px}.install-sheet>div{margin-top:12px;padding:14px;border-radius:16px;text-align:left;background:var(--small-card-bg)}.install-sheet p{margin:5px 0 0;color:var(--muted);line-height:1.55}.install-sheet .dialog-close{position:absolute;right:14px;top:14px}
.feedback-hero{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;padding:34px;border-radius:30px}.feedback-hero h1{font-size:clamp(2.6rem,6vw,5.2rem);line-height:.95;margin:12px 0}.feedback-hero h1 span{color:var(--accent-text)}.feedback-hero p{max-width:720px;color:var(--muted);line-height:1.7}.feedback-orb{width:160px;height:160px;border-radius:50%;display:grid;place-content:center;text-align:center;background:linear-gradient(145deg,#2864ff,#7956ff);color:white;box-shadow:0 24px 60px rgba(48,75,205,.3)}.feedback-orb strong{font-size:3rem}.feedback-orb span{font-size:.72rem;font-weight:750}.feedback-layout{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,.65fr);gap:16px;margin-top:16px}.feedback-form,.feedback-guide{padding:26px;border-radius:26px}.feedback-form{display:grid;gap:16px}.feedback-form label{display:grid;gap:7px;color:var(--muted);font-size:.74rem;font-weight:760}.feedback-form input,.feedback-form select,.feedback-form textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px;color:var(--ink);background:var(--surface-control);font:inherit;resize:vertical}.feedback-form input,.feedback-form select{min-height:50px}.form-section-head{display:flex;gap:12px;align-items:center;margin-top:8px}.form-section-head>span{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--accent-soft);color:var(--accent-text);font-weight:850}.form-section-head h2{margin:0}.form-section-head p{margin:3px 0 0;color:var(--muted);font-size:.76rem}.file-drop{padding:18px;border:1px dashed var(--accent-line);border-radius:16px;background:var(--accent-soft);cursor:pointer}.file-drop input{min-height:auto;padding:0;border:0;background:transparent}.file-drop span{color:var(--ink);font-size:.9rem}.feedback-submit{width:100%;justify-content:space-between}.feedback-guide{position:sticky;top:92px;align-self:start}.feedback-guide>div{display:grid;grid-template-columns:34px 1fr;gap:10px;margin-top:12px;padding:12px;border-radius:14px;background:var(--small-card-bg)}.feedback-guide>div>b{display:grid;place-items:center;width:30px;height:30px;border-radius:10px;background:var(--accent-soft);color:var(--accent-text)}.feedback-guide p{margin:0;color:var(--muted);line-height:1.45}.mini-feedback{display:grid;grid-template-columns:auto 1fr auto;gap:8px;align-items:center;padding:9px 0;border-bottom:1px solid var(--line)}.mini-feedback small{color:var(--muted)}
.feedback-filters{display:flex;gap:8px;margin:16px 0;padding:8px;border-radius:16px}.feedback-filters a{padding:9px 13px;border-radius:11px;color:var(--muted);text-decoration:none;font-size:.75rem;font-weight:750}.feedback-filters a.is-active{color:var(--ink);background:var(--surface-control)}.feedback-inbox{display:grid;gap:12px}.feedback-ticket{padding:22px;border-radius:22px}.feedback-ticket>header{display:flex;justify-content:space-between;gap:16px}.feedback-ticket h2{margin:5px 0;font-size:1.15rem}.feedback-ticket header p{margin:0;color:var(--muted);font-size:.75rem}.feedback-category{color:var(--accent-text);font-size:.68rem;font-weight:850;text-transform:uppercase}.feedback-ticket-body{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(240px,.6fr);gap:18px;margin-top:16px}.feedback-ticket-body h3{margin:14px 0 5px;font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.feedback-ticket-body p{line-height:1.65}.preline{white-space:pre-line}.feedback-ticket dl{margin:0}.feedback-ticket dt{margin-top:10px;color:var(--muted);font-size:.67rem;text-transform:uppercase}.feedback-ticket dd{margin:3px 0;word-break:break-word;font-size:.77rem}.feedback-ticket dd small{display:block;color:#d46a79}.feedback-status-form{display:flex;gap:7px;margin-top:15px}.feedback-status-form button{padding:8px 11px;border:1px solid var(--line);border-radius:10px;color:var(--muted);background:var(--surface-control);cursor:pointer}.feedback-status-form button.is-active{color:white;background:linear-gradient(145deg,#2864ff,#7956ff)}.status-open,.status-reviewing,.status-resolved{padding:5px 8px;border-radius:999px;font-size:.63rem;font-weight:800;text-transform:uppercase}.status-open{color:#b75a0a;background:rgba(255,171,64,.15)}.status-reviewing{color:#345cd6;background:rgba(62,105,255,.14)}.status-resolved{color:#0d8a53;background:rgba(30,190,113,.14)}.account-feedback{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-top:16px;padding:22px;border-radius:23px}.account-feedback h2{margin:4px 0}.account-feedback p{margin:0;color:var(--muted)}.admin-hero-actions{display:flex;gap:10px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal-item,.reveal-item.is-revealed{opacity:1;transform:none;transition:none}.ambient,.visual-orbit,.sound-ring{animation:none!important}}
@media(max-width:760px){
 body{padding-bottom:calc(76px + env(safe-area-inset-bottom));background-attachment:fixed}.site-header{padding:max(8px,env(safe-area-inset-top)) 12px 8px}.header-inner{min-height:50px}.brand-mark{width:38px;height:38px}.brand-copy strong{font-size:.94rem}.account-chip{display:none}.account-logout{display:none}.mobile-nav-button{display:none!important}.top-nav{display:none!important}.page-shell{width:100%;padding:12px 10px 28px}.site-footer{display:none}.control-center{bottom:calc(82px + env(safe-area-inset-bottom));left:10px;max-width:calc(100vw - 20px)}
 .mobile-tabbar{position:fixed;z-index:80;left:8px;right:8px;bottom:max(8px,env(safe-area-inset-bottom));display:grid;grid-template-columns:repeat(5,1fr);padding:7px 5px;border:1px solid var(--glass-line);border-radius:22px;background:color-mix(in srgb,var(--glass-strong) 88%,transparent);box-shadow:0 16px 50px rgba(0,0,0,.22);backdrop-filter:blur(24px) saturate(145%);-webkit-backdrop-filter:blur(24px) saturate(145%)}.mobile-tabbar a{display:grid;justify-items:center;gap:3px;padding:5px 2px;border-radius:15px;color:var(--muted);text-decoration:none;font-size:.62rem}.mobile-tabbar a>span{display:grid;place-items:center;width:28px;height:25px;border-radius:9px;font-size:.95rem;font-weight:850}.mobile-tabbar a>b{font-size:.58rem;white-space:nowrap}.mobile-tabbar a.is-active{color:var(--accent-text);background:var(--accent-soft)}.mobile-tabbar a.is-active>span{color:white;background:linear-gradient(145deg,#2864ff,#7956ff)}
 .home-hero{display:block;min-height:auto;padding:26px 20px 24px;border-radius:24px}.home-hero h1{font-size:clamp(2.55rem,13vw,3.7rem);line-height:.92}.home-hero p{font-size:.94rem;line-height:1.6}.hero-actions{display:grid;grid-template-columns:1fr;gap:9px}.hero-actions .button{width:100%}.hero-visual{display:none}.section-intro{padding:34px 4px 12px}.section-intro h2{font-size:1.7rem}.module-grid{gap:10px}.module-card{min-height:0;padding:20px;border-radius:20px}.module-number{font-size:2.7rem}.module-card h3{font-size:1.55rem}.module-card p{min-height:0;font-size:.86rem}.home-note{padding:17px;border-radius:19px}
 .compact-hero,.study-hero,.simulation-setup-hero,.account-hero,.admin-hero{padding:20px;border-radius:22px}.compact-hero h1,.study-hero h1,.simulation-setup-hero h1,.account-hero h1,.admin-hero h1{font-size:2.25rem}.study-stats{gap:8px}.study-stat{min-height:110px;padding:14px;border-radius:18px}.study-mode-grid{gap:9px}.study-mode-card{min-height:0;padding:18px;border-radius:19px}.ticket-workspace,.weak-preview,.simulation-config-card{padding:16px}.study-toolbar,.exam-toolbar{top:66px;border-radius:17px}.flash-answer-card{padding:14px}.flash-rating-grid button{min-height:55px}.simulation-start-button{position:sticky;bottom:86px;z-index:20;width:100%;border-radius:18px}.recorder-card{min-height:auto}.microphone-orb{transform:scale(.86)}
 .question-workspace{padding-bottom:10px}.question-dashboard{display:block}.question-side-column{margin-top:10px}.question-workspace-bar{position:sticky;top:64px;z-index:30;padding:8px;border-radius:16px}.question-progress-control{grid-template-columns:1fr}.question-progress-label{display:none}.compact-question-card,.compact-visual-card,.answer-workspace,.compact-points-card,.compact-logic-card,.compact-video-card{padding:16px;border-radius:19px}.answer-tabs{display:grid;grid-template-columns:1fr 1fr}.answer-tab{min-height:44px}.explanation-image{width:100%;height:auto;max-height:none}.question-navigation{position:sticky;bottom:80px;z-index:25;padding:8px;border-radius:16px;background:var(--glass-strong);backdrop-filter:blur(18px)}
 .feedback-hero{display:block;padding:22px;border-radius:22px}.feedback-hero h1{font-size:2.55rem}.feedback-orb{display:none}.feedback-layout{grid-template-columns:1fr}.feedback-form,.feedback-guide{padding:17px;border-radius:20px}.feedback-guide{position:static}.form-section-head{margin-top:4px}.feedback-form input,.feedback-form select,.feedback-form textarea{font-size:16px}.feedback-submit{min-height:54px}.feedback-ticket{padding:16px}.feedback-ticket>header{display:block}.feedback-ticket>header>span{display:inline-block;margin-top:8px}.feedback-ticket-body{grid-template-columns:1fr}.feedback-status-form{display:grid;grid-template-columns:repeat(3,1fr)}.feedback-status-form button{padding:10px 5px}.feedback-filters{overflow:auto}.account-feedback{display:block}.account-feedback .button{width:100%;margin-top:14px}.admin-hero-actions{width:100%;display:grid}.admin-hero-actions .button,.admin-hero-actions button{width:100%}
 .install-dialog{display:block;align-self:end;width:100%;max-height:90dvh;margin:auto 0 0;border-radius:28px 28px 0 0}.install-sheet{padding:26px 20px calc(24px + env(safe-area-inset-bottom));border-radius:28px 28px 0 0}.is-standalone .mobile-tabbar{bottom:max(4px,env(safe-area-inset-bottom))}
}
@media(max-width:390px){.mobile-tabbar a>b{font-size:.53rem}.home-hero h1{font-size:2.55rem}.study-stats{grid-template-columns:1fr 1fr}.question-workspace-bar .workspace-back span{display:none}.feedback-form{padding:14px}}


/* ============================================================
   MOBILE UI FIX V3
   Fixes overlapping action text, question-number contrast,
   compact install guidance, and light/dark mobile consistency.
   ============================================================ */
.question-number {
    min-width: 42px;
    height: 38px;
    padding: 0 12px;
    border: 1px solid rgba(255,255,255,.58);
    border-radius: 12px;
    color: #fff;
    background: linear-gradient(135deg,#2166ff 0%,#6f4dff 58%,#8a4dff 100%);
    box-shadow: 0 10px 24px rgba(55,79,220,.26), inset 0 1px 0 rgba(255,255,255,.35);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0;
    text-shadow: 0 1px 1px rgba(14,25,66,.24);
}
.compact-question-card .question-number {
    min-width: 46px;
    height: 40px;
    padding: 0 13px;
    color: #fff;
    font-size: .88rem;
}
.answer-badge {
    color: #fff;
    border-color: rgba(255,255,255,.48);
    background: linear-gradient(135deg,#2466ff,#7650ff);
    box-shadow: 0 8px 20px rgba(55,79,220,.2), inset 0 1px 0 rgba(255,255,255,.32);
    text-shadow: 0 1px 1px rgba(14,25,66,.22);
}
html[data-theme="dark"] .question-number,
html[data-theme="dark"] .answer-badge {
    color: #fff;
    border-color: rgba(255,255,255,.22);
    background: linear-gradient(135deg,#3977ff 0%,#7957ff 58%,#a050ff 100%);
    box-shadow: 0 10px 28px rgba(0,0,0,.32), 0 0 0 1px rgba(112,139,255,.12), inset 0 1px 0 rgba(255,255,255,.26);
}
.account-support-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 9px;
}
.button-subtle {
    min-height: 44px;
    color: var(--muted);
    font-size: .78rem;
}
.install-dialog {
    width: min(calc(100% - 28px), 430px);
}
.install-sheet {
    padding: 24px;
}
.install-sheet > img {
    width: 68px;
    height: 68px;
    border-radius: 18px;
}
.install-sheet h2 {
    margin: 12px 0 7px;
    font-size: 1.45rem;
}
.install-sheet > div {
    padding: 12px;
}

@media (max-width:760px) {
    /* Hide the floating language/theme control where it has no useful text to translate. */
    .home-page .control-center,
    .understand-page .control-center,
    .learn-page .control-center,
    .account-page .control-center,
    .feedback-page .control-center {
        display: none;
    }

    /* On content pages keep the control small and away from the left-side content. */
    .question-detail-page .control-center,
    .flashcards-page .control-center,
    .simulation-page .control-center {
        right: 10px;
        left: auto;
        bottom: calc(84px + env(safe-area-inset-bottom));
    }
    .control-center.is-collapsed {
        width: 44px;
    }

    /* Home cards: action is part of normal flow, never over the description. */
    .module-card {
        display: flex;
        min-height: 310px;
        padding: 20px;
        flex-direction: column;
    }
    .module-number {
        margin-top: 42px;
        font-size: 2.7rem;
        line-height: .85;
    }
    .module-card h3 {
        margin: 17px 0 8px;
        font-size: 1.55rem;
        line-height: 1.12;
    }
    .module-card p {
        margin: 0;
        min-height: 0;
        color: var(--muted);
        font-size: .86rem;
        line-height: 1.5;
    }
    .module-link {
        position: relative;
        right: auto;
        bottom: auto;
        left: auto;
        width: 100%;
        margin-top: auto;
        padding-top: 18px;
        align-items: center;
        gap: 12px;
        line-height: 1.25;
    }
    .module-link b {
        flex: 0 0 auto;
        font-size: 1.25rem;
        line-height: 1;
    }

    /* Learning-mode cards: bottom action no longer overlaps the paragraph. */
    .study-mode-card {
        display: flex;
        min-height: 210px;
        padding: 18px;
        flex-direction: column;
        overflow: hidden;
    }
    .study-mode-card small {
        margin-top: 22px;
    }
    .study-mode-card h3 {
        margin: 7px 0;
        line-height: 1.18;
    }
    .study-mode-card p {
        margin: 0;
        font-size: .82rem;
        line-height: 1.48;
    }
    .study-mode-card b {
        position: relative;
        bottom: auto;
        left: auto;
        display: block;
        margin-top: auto;
        padding-top: 17px;
        color: var(--ink);
        line-height: 1.2;
    }

    .question-card .question-number {
        min-width: 46px;
        height: 40px;
        padding: 0 13px;
        font-size: .82rem;
    }
    .compact-question-meta {
        align-items: center;
        gap: 9px;
    }
    .answer-workspace-header {
        align-items: center;
    }
    .answer-workspace-header .answer-badge {
        flex: 0 0 auto;
        max-width: 46%;
        padding: 6px 10px;
        text-align: center;
        line-height: 1.2;
    }

    .account-feedback {
        display: block;
    }
    .account-support-actions {
        display: grid;
        grid-template-columns: 1fr;
        margin-top: 14px;
    }
    .account-support-actions .button {
        width: 100%;
        margin-top: 0;
    }

    /* The guide is now a compact manual sheet opened only from Account. */
    .install-dialog {
        display: block;
        align-self: center;
        width: min(calc(100% - 24px), 410px);
        max-height: 82dvh;
        margin: auto;
        border-radius: 24px;
    }
    .install-sheet {
        max-height: 82dvh;
        padding: 22px 18px calc(20px + env(safe-area-inset-bottom));
        overflow: auto;
        border-radius: 24px;
    }
    .install-sheet > img {
        width: 62px;
        height: 62px;
    }
    .install-sheet h2 {
        font-size: 1.35rem;
    }
    .install-sheet p {
        font-size: .84rem;
        line-height: 1.48;
    }
}

@media (max-width:390px) {
    .module-card { min-height: 300px; }
    .module-number { margin-top: 34px; }
    .study-mode-card { min-height: 205px; }
    .answer-workspace-header { align-items: flex-start; }
    .answer-workspace-header .answer-badge { max-width: 50%; font-size: .61rem; }
}


/* ============================================================
   MOBILE BROWSER FIX V4
   The install guide exists only on Account. This section also
   prevents iOS Safari rubber-band overscroll from exposing a
   plain white browser canvas beyond the page.
   ============================================================ */
dialog.install-dialog:not([open]) {
    display: none !important;
}
html, body {
    overscroll-behavior-y: none;
}
html {
    min-height: 100%;
    background-color: var(--page);
}
html[data-theme="dark"] {
    background-color: #071020;
}
@media (max-width:760px) {
    html {
        min-height: 100%;
        background:
            radial-gradient(circle at 0 0,rgba(84,150,255,.30),transparent 28rem),
            radial-gradient(circle at 100% 12%,rgba(143,102,255,.22),transparent 30rem),
            linear-gradient(140deg,var(--page),var(--page-2) 48%,#effbff);
    }
    html[data-theme="dark"] {
        background:
            radial-gradient(circle at 0 0,rgba(39,93,213,.30),transparent 28rem),
            radial-gradient(circle at 100% 10%,rgba(109,63,219,.23),transparent 30rem),
            linear-gradient(140deg,#071020,#101126 54%,#071923);
    }
    body {
        min-height: 100svh;
        background-attachment: scroll;
    }
}


/* ============================================================
   COMPLETE MOBILE BROWSER FIX V5
   - The install guide markup now exists only in account.html.
   - New asset filenames bypass every older Safari/PWA cache.
   - Root and page backgrounds match during iOS Safari rubber-band.
   - Mobile end spacing is limited to what the fixed tab bar needs.
   ============================================================ */
:root {
    --browser-canvas-light: #e9f2ff;
    --browser-canvas-dark: #071020;
}
html {
    min-height: 100%;
    overflow-x: hidden;
    overscroll-behavior-y: none;
    background-color: var(--browser-canvas-light);
    background-image:
        radial-gradient(circle at 0 0, rgba(84,150,255,.30), transparent 28rem),
        radial-gradient(circle at 100% 12%, rgba(143,102,255,.22), transparent 30rem),
        linear-gradient(140deg, var(--page), var(--page-2) 48%, #effbff);
    background-repeat: no-repeat;
    background-size: cover;
}
html[data-theme="dark"] {
    background-color: var(--browser-canvas-dark);
    background-image:
        radial-gradient(circle at 0 0, rgba(39,93,213,.30), transparent 28rem),
        radial-gradient(circle at 100% 10%, rgba(109,63,219,.23), transparent 30rem),
        linear-gradient(140deg, #071020, #101126 54%, #071923);
}
body {
    position: relative;
    min-height: 100vh;
    min-height: 100svh;
    overflow-x: clip;
    overscroll-behavior-y: none;
    background-color: transparent;
}
dialog.install-dialog:not([open]) {
    display: none !important;
}
@media (max-width:760px) {
    body {
        padding-bottom: calc(68px + env(safe-area-inset-bottom));
        background-attachment: scroll;
    }
    .page-shell {
        padding-bottom: 10px;
    }
    .account-support-actions .button-subtle {
        opacity: .78;
        font-weight: 720;
    }
}
@supports (-webkit-touch-callout: none) {
    html, body {
        background-attachment: scroll !important;
    }
}