/* MathGuide Humanised UI Layer
   Loaded after styles.css so the original implementation and JS hooks remain intact. */

:root{
  --primary-950:#071b31;
  --primary-900:#0a2949;
  --primary-800:#0b3b67;
  --primary-700:#0d5fa8;
  --primary-600:#1778ca;
  --green-800:#245a35;
  --green-700:#2f7242;
  --green-600:#448a58;
  --gold-500:#f4c84d;
  --canvas:#f4f7fb;
  --surface-soft:#f7f9fc;
  --ink-950:#142033;
  --ink-800:#26354a;
  --ink-700:#3d4d62;
  --ink-600:#57677b;
  --ink-500:#758398;
  --ink-200:#e2e8f0;
  --shadow-sm:0 2px 8px rgba(14,39,68,.045);
  --shadow-md:0 14px 38px rgba(14,39,68,.09);
  --shadow-lg:0 28px 72px rgba(8,34,61,.17);
}

html{background:var(--primary-950)}
body{
  background:
    radial-gradient(circle at 10% 16%,rgba(23,120,202,.045),transparent 28rem),
    radial-gradient(circle at 90% 34%,rgba(68,138,88,.04),transparent 30rem),
    var(--canvas);
  letter-spacing:-.004em;
}

h1,h2,h3,h4{color:var(--ink-950)}
p{max-width:76ch}
::selection{background:#cfe6fb;color:var(--primary-950)}

/* Header: calmer, clearer, more tactile */
.topbar{
  background:rgba(7,27,49,.92);
  border-bottom-color:rgba(255,255,255,.07);
  box-shadow:0 8px 28px rgba(4,19,36,.09);
}
.nav-shell{min-height:74px}
.brand{gap:12px}
.brand-mark{
  width:42px;height:42px;border-radius:14px;
  background:linear-gradient(145deg,#4a965e,#1577c7);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.28),0 9px 22px rgba(15,99,173,.22);
}
.brand-name{font-size:1.02rem}
.brand-tagline{color:#abc1d7}
.desktop-nav{padding:4px;border:1px solid rgba(255,255,255,.06);border-radius:14px;background:rgba(255,255,255,.035)}
.desktop-nav a{position:relative;padding:9px 9px;border-radius:10px;color:#c9d7e5;font-size:.79rem;white-space:nowrap}
.desktop-nav a:hover{background:rgba(255,255,255,.065)}
.desktop-nav a[aria-current="page"]{background:#fff;color:var(--primary-900);box-shadow:0 4px 15px rgba(0,0,0,.13)}
.nav-app{min-height:44px;padding-inline:16px;border-radius:13px;background:#f6d25c;box-shadow:0 10px 26px rgba(246,210,92,.16)}
.nav-app:hover{filter:brightness(1.03)}
.menu-button{width:44px;height:44px;border-radius:13px}
.mobile-menu{padding:10px 18px 20px;background:rgba(7,27,49,.985)}
.mobile-menu a{padding:14px 8px;border-radius:10px;border-bottom:0}
.mobile-menu a:hover{background:rgba(255,255,255,.06)}

/* Hero: warmer and less corporate */
.home-hero,.page-hero{
  background:
    radial-gradient(circle at 12% 15%,rgba(90,164,105,.30),transparent 27rem),
    radial-gradient(circle at 92% 4%,rgba(36,130,213,.34),transparent 30rem),
    linear-gradient(145deg,#071b31 0%,#0b3154 58%,#0b4065 100%);
}
.home-hero::before,.page-hero::before{opacity:.16;background-size:58px 58px}
.home-hero{padding:88px 0 78px}
.page-hero{padding:72px 0 78px}
.home-hero-grid{gap:64px}
.home-hero h1,.page-hero h1{
  max-width:780px;
  letter-spacing:-.058em;
  text-wrap:balance;
}
.accent{color:#9bd9aa}
.hero-copy{color:#c6d6e6;line-height:1.72}
.eyebrow{
  padding:7px 11px;border:1px solid rgba(255,255,255,.10);border-radius:999px;
  background:rgba(255,255,255,.055);color:#e2edf7;letter-spacing:.045em;
}
.eyebrow-dot{box-shadow:0 0 0 5px rgba(244,200,77,.12)}
.button{border-radius:14px;min-height:49px}
.button-primary{background:linear-gradient(135deg,#438b58,#1778ca);box-shadow:0 13px 30px rgba(13,95,168,.24)}
.button-secondary{background:rgba(255,255,255,.075);border-color:rgba(255,255,255,.17)}
.button-outline{border-color:#d5dde7;color:var(--primary-700)}
.hero-search{
  padding:7px;border-radius:18px;background:rgba(255,255,255,.10);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
}
.hero-search-label{min-height:47px}
.hero-hints{gap:7px;color:#aec0d2}
.hero-hints span{padding:5px 9px;border:1px solid rgba(255,255,255,.07);border-radius:999px;background:rgba(255,255,255,.045)}

/* Countdown and trust */
.countdown-panel{
  padding:27px;border-radius:30px;border-color:rgba(255,255,255,.16);
  background:linear-gradient(150deg,rgba(255,255,255,.13),rgba(255,255,255,.045));
  box-shadow:0 32px 80px rgba(0,0,0,.22);
}
.countdown-panel::after{
  content:"";position:absolute;inset:auto 26px 0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(244,200,77,.7),transparent)
}
.countdown-unit{padding:16px 6px 13px;border-radius:15px;background:rgba(1,15,28,.28)}
.countdown-value{font-size:1.62rem;color:#f6d25c}
.trust-strip{margin-top:-28px}
.trust-shell{border-radius:22px;box-shadow:0 18px 44px rgba(19,45,76,.09)}
.trust-item{min-height:92px;padding:19px 23px}
.trust-icon{width:42px;height:42px;border-radius:13px;background:linear-gradient(145deg,#eef6ff,#eef9f1);color:var(--primary-700)}
.trust-item strong{font-size:.9rem}

/* Sections and cards */
.section{padding:80px 0}
.surface-section{background:linear-gradient(180deg,rgba(255,255,255,.9),#fff)}
.section-kicker{letter-spacing:.065em;color:var(--primary-700)}
.section-heading h2{letter-spacing:-.043em;text-wrap:balance}
.section-description{line-height:1.7}
.card-grid{gap:20px}
.link-card{
  min-height:238px;padding:27px;border-color:#e0e7ef;border-radius:24px;
  background:linear-gradient(180deg,#fff,#fcfdff);box-shadow:var(--shadow-sm);
}
.link-card:hover{transform:translateY(-4px);border-color:#c2d6ea;box-shadow:0 18px 42px rgba(18,52,86,.10)}
.link-card::before{
  content:"";position:absolute;inset:0 auto auto 0;width:100%;height:4px;
  background:linear-gradient(90deg,var(--card-color,var(--primary-700)),transparent 74%);
}
.link-card::after{width:150px;height:150px;right:-74px;bottom:-80px;opacity:.85}
.card-icon{width:50px;height:50px;margin-bottom:25px;border-radius:16px;box-shadow:0 9px 24px rgba(20,70,115,.13)}
.link-card h3{font-size:1.1rem;line-height:1.35}
.link-card p{font-size:.88rem;line-height:1.62}
.card-link{font-size:.82rem}
.info-panel,.tool-card,.contact-card,.legal-card{border-color:#e0e7ef;box-shadow:var(--shadow-sm)}
.info-panel,.tool-card,.contact-card{border-radius:24px}
.callout{border-left-width:4px;background:#fffaf0;box-shadow:0 8px 24px rgba(122,82,18,.05)}

/* Resource library: readable list rather than a wall of identical blue */
.resource-shell,.resource-list-shell{border-color:#dfe7f0;border-radius:26px;box-shadow:0 18px 48px rgba(20,47,76,.08)}
.resource-list-shell{background:#f5f8fb}
.resource-toolbar{padding:20px;background:#fff}
.field input,.field select{min-height:48px;border-color:#d5dee8;border-radius:13px;background:#fff}
.results-bar{padding:14px 20px;background:#fbfcfe}
.view-only-note{border-color:#d9e2eb;background:#fbfdff}
.paper-list{gap:10px;padding:16px}
.paper-list-item{
  min-height:66px;grid-template-columns:44px minmax(0,1fr) 36px;
  border:0;border-radius:18px;
  background:linear-gradient(135deg,#0b77a8,#0a6597);color:#fff;
  box-shadow:0 7px 18px rgba(10,101,151,.18),inset 0 1px 0 rgba(255,255,255,.18);
}
.paper-list-item:hover{transform:translateY(-2px);background:linear-gradient(135deg,#0b77a8,#0a6597);box-shadow:0 11px 24px rgba(10,101,151,.25),inset 0 1px 0 rgba(255,255,255,.2);filter:brightness(1.04)}
.paper-list-icon{width:40px;height:40px;border-radius:13px;background:rgba(255,255,255,.13);color:#fff}
.paper-list-title{color:#fff;text-align:left;font-size:.93rem}
.paper-list-meta{color:#cfeafa;text-align:left}
.paper-list-open{color:#dff5ff}
.resource-row-skeleton{border:1px solid #e4eaf1;background:linear-gradient(90deg,#edf1f5 25%,#f8fafc 37%,#edf1f5 63%)}

/* Filters and result grids */
.filter-row{gap:13px;margin-bottom:26px}
.video-grid,.tutor-grid{gap:20px}
.video-card,.tutor-card{border-color:#e0e7ef;border-radius:22px;box-shadow:var(--shadow-sm)}
.video-card{background:#fff}
.video-card:hover{transform:translateY(-3px);box-shadow:0 17px 38px rgba(22,50,78,.10)}
.video-thumb{background:linear-gradient(145deg,#0a3b68,#2f7242)}
.video-body{padding:18px 19px 20px}
.video-body h3{font-size:.98rem}
.subject-pill{border-radius:999px;background:#eaf7ee;color:var(--green-800);letter-spacing:.02em}
.play-button{width:52px;height:52px;background:#fff;box-shadow:0 10px 28px rgba(0,0,0,.24)}
.subscribe-banner{border:0;border-radius:21px;background:linear-gradient(135deg,#0b3b67,#2f7242);box-shadow:0 16px 36px rgba(10,50,81,.14)}

/* Tutor cards: give the profile room to breathe */
.tutor-card{padding:22px;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
.tutor-card:hover{transform:translateY(-3px);border-color:#c8d9e9;box-shadow:0 16px 36px rgba(23,51,79,.09)}
.tutor-avatar{width:52px;height:52px;border-radius:17px;background:linear-gradient(145deg,#fff1b9,#f6d25c);box-shadow:inset 0 0 0 1px rgba(102,77,0,.06)}
.tutor-name-row h3{font-size:1rem}
.verified{width:18px;height:18px;background:#1778ca;box-shadow:0 4px 10px rgba(23,120,202,.18)}
.tutor-subjects{padding:8px 10px;border-radius:11px;background:#f1f7fd;color:var(--primary-700)}
.tutor-bio{font-size:.83rem;line-height:1.58}
.tutor-footer{padding-top:15px}
.contact-link{padding:7px 10px;border-radius:9px;background:#edf6ff}

/* Updates */
.updates-layout{gap:26px}
.notice-shell{border-color:#e0e7ef;border-radius:22px}
.notice-item{padding:20px 21px;transition:background .18s ease}
.notice-item:hover{background:#fbfdff}
.notice-dot{margin-top:7px;background:#1778ca}
.exam-list{gap:13px}
.exam-card{padding:19px;border-color:#e0e7ef;border-radius:18px;box-shadow:var(--shadow-sm)}
.exam-card time{color:var(--primary-700)}

/* Learning and AI */
.learning-grid{gap:25px}
.tool-card{padding:29px}
.tool-link{padding:16px;border-color:#e1e8ef;border-radius:14px;background:#f8fafc;transition:transform .18s ease,border-color .18s ease,background .18s ease}
.tool-link:hover{transform:translateX(3px);border-color:#c7dced;background:#f3f8fd}
.chat-card{border-radius:26px;background:linear-gradient(180deg,#071d34,#07172a);box-shadow:0 28px 70px rgba(7,29,52,.20)}
.chat-head{padding:19px 20px}
.chat-logo{width:41px;height:41px;border-radius:13px}
.chat-messages{height:440px;padding:19px}
.chat-message{padding:12px 14px;border-radius:15px}
.chat-message.assistant{background:rgba(255,255,255,.085)}
.chat-message.user{background:#1778ca}
.chat-form{padding:13px}
.chat-form input{min-height:48px;border-radius:13px}
.chat-form button{border-radius:13px;background:#448a58}

/* About, contact, legal */
.about-grid,.contact-grid{gap:28px}
.mission-panel{border-radius:28px;background:radial-gradient(circle at 88% 10%,rgba(187,247,208,.16),transparent 30%),linear-gradient(135deg,#24745e,#0b5e84);box-shadow:0 25px 60px rgba(9,82,108,.16)}
.value-card{border-radius:17px}
.quote-panel{border:1px solid #dcecdf;border-radius:27px;background:linear-gradient(145deg,#f4fbf6,#edf8f0)}
.contact-item{border:1px solid #e3e9f0;background:#f9fbfd;transition:transform .16s ease,border-color .16s ease,background .16s ease}
.contact-item:hover{transform:translateX(3px);border-color:#c8dced;background:#f3f8fd}
.toc{border-color:#e0e7ef;border-radius:20px;box-shadow:var(--shadow-sm)}
.toc a{border-radius:10px}
.legal-card{border-radius:26px}
.definition,.right-card{border-color:#e2e8ef;border-radius:15px;background:#f8fafc}

/* App banner + footer */
.app-banner{border-radius:30px;background:radial-gradient(circle at 90% 20%,rgba(244,200,77,.15),transparent 30%),linear-gradient(135deg,#0a3a65,#2b6b3d);box-shadow:0 24px 58px rgba(12,54,78,.15)}
.footer{margin-top:72px;padding-top:58px;background:#07192c}
.footer-grid{gap:42px}
.footer-links{gap:9px}
.footer-links a{transition:color .16s ease,transform .16s ease}
.footer-links a:hover{color:#fff;transform:translateX(2px)}
.footer-bottom{border-top-color:rgba(255,255,255,.08)}
.toast{border-radius:14px;box-shadow:0 16px 38px rgba(5,25,45,.18)}

/* Viewer — keep the focused reading experience, polish controls only */
.viewer-topbar{background:rgba(7,25,44,.97);box-shadow:0 8px 24px rgba(0,0,0,.18)}
.viewer-back,.viewer-controls button{border-radius:12px}
.pdf-viewer-stage{background:#202832}
.pdf-page-canvas{box-shadow:0 8px 26px rgba(0,0,0,.25)}

/* Accessibility and interaction polish */
a,button,.paper-list-item,.tool-link,.contact-item{-webkit-tap-highlight-color:transparent}
button:disabled{cursor:not-allowed}
@media (hover:hover){
  .button:hover{transform:translateY(-1px)}
}

@media(max-width:1080px){
  .desktop-nav{padding:0;border:0;background:transparent}
  .home-hero-grid{gap:42px}
}

@media(max-width:780px){
  .container{width:min(calc(100% - 30px),var(--container))}
  .section{padding:62px 0}
  .home-hero{padding:62px 0 56px}
  .page-hero{padding:58px 0 63px}
  .home-hero h1,.page-hero h1{letter-spacing:-.048em}
  .trust-strip{margin-top:14px}
  .trust-shell{border-radius:20px}
  .card-grid{gap:14px}
  .link-card{min-height:0;padding:22px;border-radius:20px}
  .link-card .card-icon{margin-bottom:18px}
  .video-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .video-body{padding:11px 12px 14px}
  .video-body h3{font-size:.84rem}
  .tutor-grid{grid-template-columns:1fr}
  .paper-list{padding:11px}
  .paper-list-item{min-height:62px;padding:8px 11px}
  .paper-list-title,.paper-list-meta{text-align:left}
  .chat-messages{height:390px}
  .footer{margin-top:58px}
}

@media(max-width:540px){
  .nav-shell{min-height:68px}
  .brand-mark{width:39px;height:39px}
  .mobile-menu{inset:68px 0 auto;max-height:calc(100vh - 68px)}
  .eyebrow{font-size:.69rem}
  .home-hero h1,.page-hero h1{font-size:clamp(2.2rem,10.8vw,3.15rem)}
  .hero-copy{font-size:.96rem}
  .hero-search-label{background:rgba(255,255,255,.09)}
  .countdown-panel{padding:21px;border-radius:23px}
  .countdown-unit{padding:13px 4px 10px}
  .countdown-value{font-size:1.28rem}
  .trust-item{min-height:78px;padding:16px 18px}
  .section-heading{margin-bottom:24px}
  .section-heading h2{font-size:1.8rem}
  .card-grid{grid-template-columns:1fr}
  .link-card{padding:20px}
  .video-grid{grid-template-columns:1fr}
  .video-body{padding:15px 16px 17px}
  .video-body h3{font-size:.94rem}
  .paper-list-item{grid-template-columns:40px minmax(0,1fr) 28px}
  .paper-list-meta{display:block}
  .filter-row{gap:10px}
  .tool-card,.contact-card{padding:23px}
  .chat-messages{height:360px}
  .app-banner{padding:27px 22px;border-radius:24px}
  .footer-grid{gap:30px}
}

@media(max-width:390px){
  .paper-list-meta{display:none}
  .countdown-label{font-size:.56rem}
}

/* Direct YouTube uploads — IDs resolved by YouTube's own IFrame API */
.video-section-heading{align-items:flex-end;margin:26px 0 18px}
.video-status{min-height:44px;display:flex;align-items:center;margin-bottom:18px;padding:10px 14px;border:1px solid var(--ink-200);border-radius:13px;background:#fff;color:var(--ink-600);font-size:.86rem}
.video-status a{margin-left:4px;font-weight:700;color:var(--primary-700)}
.youtube-id-card{text-decoration:none;color:inherit}
.youtube-chip{position:absolute;left:9px;bottom:9px;padding:4px 8px;border-radius:999px;background:rgba(255,0,51,.94);color:#fff;font-size:.62rem;font-weight:800;letter-spacing:.03em}
.youtube-direct-note{display:flex;align-items:flex-start;gap:11px;margin-top:18px;padding:14px 16px;border:1px solid var(--ink-200);border-radius:14px;background:#fff;color:var(--ink-600)}
.youtube-direct-note>span{display:grid;place-items:center;flex:0 0 30px;width:30px;height:30px;border-radius:9px;background:#ff0033;color:#fff;font-size:.72rem}
.youtube-direct-note p{margin:3px 0 0;font-size:.84rem;line-height:1.5}
.youtube-discovery-host{position:fixed;left:-12000px;top:0;width:320px;height:200px;overflow:hidden;opacity:.001;pointer-events:none}
.youtube-state-link{display:flex;text-decoration:none;color:inherit;min-height:112px}
@media(max-width:780px){.video-section-heading{align-items:flex-start}.video-status{font-size:.8rem}.youtube-direct-note{font-size:.82rem}}
@media(max-width:540px){.youtube-direct-note{padding:12px 13px}.video-status{align-items:flex-start;flex-direction:column}}

/* ---------------------------------------------------------
   YouTube feed cards — compact two-column mobile presentation
   --------------------------------------------------------- */
.page-videos .video-feed-section{padding-top:40px}
.page-videos .subscribe-banner{margin-bottom:20px}
.video-search-shell{margin:0 0 24px;padding:12px;border-radius:24px;background:linear-gradient(135deg,#0d69b6,#0a5b9e);box-shadow:0 16px 36px rgba(10,91,158,.13)}
.video-search{display:flex;align-items:center;gap:12px;min-height:58px;padding:0 18px;border:1px solid rgba(255,255,255,.7);border-radius:19px;background:#f8fafc;box-shadow:0 8px 20px rgba(6,38,68,.08)}
.video-search .icon{width:23px;height:23px;flex:0 0 23px;color:#657386}
.video-search input{width:100%;min-width:0;border:0;outline:0;background:transparent;color:#15263a;font:600 1rem/1.2 "DM Sans",sans-serif}
.video-search input::placeholder{color:#758197;font-weight:500}
.video-feed-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:16px}
.video-feed-heading h2{margin:3px 0 0}
.video-feed-heading .video-status{min-height:auto;margin:0;padding:0;border:0;background:transparent;color:var(--ink-500);font-size:.82rem;white-space:nowrap}
.feed-video-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.feed-video-card{border:0;border-radius:18px;background:#eef2f8;box-shadow:0 4px 14px rgba(18,48,78,.09);text-decoration:none;color:inherit;overflow:hidden}
.feed-video-card:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(18,48,78,.16)}
.feed-video-card .video-thumb{aspect-ratio:16/9;background:#d8e1eb}
.feed-video-card .video-thumb img{display:block;width:100%;height:100%;object-fit:cover}
.feed-video-card .video-overlay{background:transparent}
.feed-video-card .play-button{width:52px;height:52px;padding-left:4px;border:0;background:rgba(60,66,74,.42);color:#fff;box-shadow:none;backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px)}
.feed-video-card .video-body{min-height:108px;padding:14px 16px 16px;background:#eef2f8}
.feed-video-card .video-badge{align-self:flex-start;margin:0 0 9px;padding:6px 12px;border:0;border-radius:999px;background:#fdecc2;color:#a96b00;font-size:.68rem;font-weight:800;line-height:1}
.feed-video-card .video-body h3{display:-webkit-box;overflow:hidden;margin:0;color:#142338;font-size:.98rem;font-weight:700;line-height:1.32;-webkit-box-orient:vertical;-webkit-line-clamp:2}
.feed-video-card .video-body p{margin:8px 0 0;color:#8592a3;font-size:.68rem}
.video-feed-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:18px;color:var(--ink-500);font-size:.8rem}
.video-feed-footer a{font-weight:800;color:var(--primary-700)}
.video-empty-state{grid-column:1/-1}

@media(max-width:900px){
  .feed-video-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
}

@media(max-width:540px){
  .page-videos .page-hero{padding-bottom:48px}
  .page-videos .video-feed-section{padding-top:28px}
  .page-videos .subscribe-banner{border-radius:19px}
  .video-search-shell{margin-bottom:20px;padding:9px;border-radius:21px}
  .video-search{min-height:56px;border-radius:17px}
  .video-feed-heading{align-items:flex-start;margin-bottom:13px}
  .video-feed-heading h2{font-size:1.45rem}
  .video-feed-heading .section-kicker{font-size:.63rem}
  .video-feed-heading .video-status{padding-top:4px;font-size:.72rem}
  .feed-video-grid,.video-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}
  .feed-video-card{min-width:0;border-radius:16px}
  .feed-video-card .video-body{min-height:104px;padding:12px 12px 14px}
  .feed-video-card .video-badge{margin-bottom:8px;padding:5px 10px;font-size:.6rem}
  .feed-video-card .video-body h3{font-size:.82rem;line-height:1.3}
  .feed-video-card .video-body p{margin-top:7px;font-size:.62rem}
  .feed-video-card .play-button{width:44px;height:44px;font-size:.84rem}
  .video-feed-footer{align-items:flex-start;flex-direction:column;gap:6px}
}

@media(max-width:360px){
  .feed-video-grid,.video-grid{gap:8px}
  .feed-video-card .video-body{padding:11px 11px 13px}
  .feed-video-card .video-body h3{font-size:.78rem}
  .feed-video-card .video-badge{font-size:.57rem}
}


/* Rich navigation labels: preserve clarity without crowding medium laptop widths. */
@media (max-width:1180px){
  .desktop-nav{display:none}
  .menu-button{display:grid}
}

/* =========================================================
   Platform parity upgrade — Exams, resource library & reader
   ========================================================= */

/* --- Exam countdown: confirmed / pending / live states --- */
.countdown-head-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:13px}
.countdown-head-row .panel-badge{margin-bottom:0}
.panel-badge[data-state="confirmed"]{color:#d9ebff}
.panel-badge[data-state="pending"]{color:#ffe3a2}
.panel-badge[data-state="live"]{color:#b9f3c9}
.panel-badge[data-state="empty"]{color:#c5d5e5}
.countdown-calendar{display:inline-flex;align-items:center;gap:7px;min-height:34px;padding:0 10px;border:1px solid rgba(255,255,255,.15);border-radius:10px;background:rgba(255,255,255,.07);color:#e7f2fb;font-size:.68rem;font-weight:800}
.countdown-calendar:hover{background:rgba(255,255,255,.12)}
.countdown-calendar .icon{width:15px;height:15px}
.countdown-state-message{margin:6px 0 14px;padding:16px;border:1px solid rgba(255,255,255,.10);border-radius:15px;background:rgba(2,14,28,.30);color:#d9e7f5;font-family:"Manrope",sans-serif;font-size:1rem;font-weight:800;text-align:center}
.countdown-state-message[data-state="live"]{border-color:rgba(134,239,172,.24);background:rgba(20,83,45,.42);color:#c7f9d4}
.countdown-state-message[data-state="pending"]{border-color:rgba(250,204,21,.22);background:rgba(113,63,18,.30);color:#fde8a8}
.countdown-exam-selector{display:flex;gap:7px;margin-top:14px;padding-bottom:2px;overflow-x:auto;scrollbar-width:none}
.countdown-exam-selector::-webkit-scrollbar{display:none}
.countdown-exam-chip{flex:0 0 auto;min-height:34px;padding:0 11px;border:1px solid rgba(255,255,255,.14);border-radius:999px;background:rgba(255,255,255,.06);color:#bfd0e1;font-size:.69rem;font-weight:800;white-space:nowrap}
.countdown-exam-chip:hover{background:rgba(255,255,255,.11)}
.countdown-exam-chip.is-active{border-color:rgba(244,200,77,.44);background:#f4c84d;color:#243042}
.countdown-updates-link{display:inline-flex;margin-top:16px;color:#cae0f4;font-size:.72rem;font-weight:800}
.countdown-updates-link:hover{color:#fff}

/* --- Exam schedule cards --- */
.exam-card{display:grid;gap:9px}
.exam-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.exam-card-head>div{min-width:0}
.exam-level{display:inline-flex;margin-bottom:5px;padding:4px 8px;border-radius:999px;background:#edf5fd;color:var(--primary-700);font-size:.65rem;font-weight:800;text-transform:uppercase}
.exam-card strong{margin:0;font-size:.94rem;line-height:1.35}
.exam-card time{display:block;color:var(--primary-700);font-size:.84rem;font-weight:800}
.exam-status-copy{color:var(--ink-600)!important;font-size:.78rem!important}
.exam-state-badge{flex:0 0 auto;padding:5px 8px;border-radius:999px;background:#edf5fd;color:var(--primary-700)!important;font-size:.64rem!important;font-weight:800;text-transform:uppercase;letter-spacing:.02em}
.exam-state-badge[data-state="live"]{background:#e8f8ed;color:#23723a!important}
.exam-state-badge[data-state="pending"]{background:#fff4d9;color:#946200!important}
.exam-calendar-action{justify-self:start;display:inline-flex;align-items:center;gap:7px;margin-top:2px;padding:7px 10px;border:1px solid #d7e1eb;border-radius:10px;background:#fff;color:var(--primary-700);font-size:.72rem;font-weight:800}
.exam-calendar-action:hover{background:#f5f9fd;border-color:#bed3e7}
.exam-calendar-action .icon{width:15px;height:15px}

/* --- Resource library --- */
.resource-continue{display:grid;grid-template-columns:42px minmax(0,1fr) auto;align-items:center;gap:13px;margin-bottom:15px;padding:14px 16px;border:1px solid #dce6ef;border-radius:18px;background:linear-gradient(135deg,#fff,#f8fbfe);box-shadow:var(--shadow-sm)}
.resource-continue[hidden]{display:none}
.resource-continue-icon{width:40px;height:40px;display:grid;place-items:center;border-radius:13px;background:#eaf4fd;color:var(--primary-700);font-size:1.15rem;font-weight:900}
.resource-continue-copy{min-width:0;display:grid;gap:2px}
.resource-continue-copy span{color:var(--green-700);font-size:.68rem;font-weight:800;text-transform:uppercase;letter-spacing:.04em}
.resource-continue-copy strong{overflow:hidden;color:var(--ink-950);font-size:.9rem;text-overflow:ellipsis;white-space:nowrap}
.resource-continue-copy small{color:var(--ink-500);font-size:.72rem}
.resource-continue .button{min-height:40px;padding:0 13px;font-size:.75rem}
.resource-library-status{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:11px;padding:13px 18px;border-bottom:1px solid #e1e8ef;background:#f9fbfd}
.resource-library-status>div{display:grid;gap:1px}
.resource-library-status strong{color:var(--ink-800);font-size:.8rem}
.resource-library-status small{color:var(--ink-500);font-size:.68rem}
.resource-status-dot{width:9px;height:9px;border-radius:50%;background:#f59e0b;box-shadow:0 0 0 4px rgba(245,158,11,.12)}
.resource-library-status[data-state="online"] .resource-status-dot{background:#2f8a4a;box-shadow:0 0 0 4px rgba(47,138,74,.12)}
.resource-library-status[data-state="offline"] .resource-status-dot{background:#dc6b36;box-shadow:0 0 0 4px rgba(220,107,54,.12)}
.resource-library-status[data-state="loading"] .resource-status-dot{animation:resourcePulse 1.2s ease infinite}
@keyframes resourcePulse{50%{transform:scale(1.25);opacity:.55}}
.resource-refresh{min-height:34px;padding:0 10px;border:1px solid #d8e1ea;border-radius:10px;background:#fff;color:var(--primary-700);font-size:.7rem;font-weight:800}
.resource-refresh:disabled{opacity:.45;cursor:wait}
.resource-toolbar-compact{grid-template-columns:minmax(260px,1.4fr) minmax(170px,.65fr) minmax(130px,.45fr)}
.resource-filter-strip{display:flex;align-items:center;gap:10px;padding:10px 18px;border-bottom:1px solid #e5ebf1;background:#fff}
.resource-kind-strip{background:#fbfcfe}
.resource-filter-label{flex:0 0 auto;width:42px;color:var(--ink-500);font-size:.68rem;font-weight:800;text-transform:uppercase;letter-spacing:.04em}
.resource-grade-chips{display:flex;gap:7px;min-width:0;overflow-x:auto;padding:2px 1px;scrollbar-width:none}
.resource-grade-chips::-webkit-scrollbar{display:none}
.resource-filter-chip{flex:0 0 auto;min-height:34px;padding:0 11px;border:1px solid #d6e0e9;border-radius:999px;background:#fff;color:var(--ink-700);font-size:.72rem;font-weight:750;white-space:nowrap}
.resource-filter-chip:hover{border-color:#b9cfe3;background:#f7fbff;color:var(--primary-700)}
.resource-filter-chip.is-active{border-color:var(--primary-700);background:var(--primary-700);color:#fff;box-shadow:0 5px 14px rgba(13,95,168,.16)}
.paper-list-item{min-height:82px;grid-template-columns:44px minmax(0,1fr) 36px;padding:10px 13px}
.paper-list-copy{gap:3px}
.paper-title-line{display:flex;align-items:center;gap:6px;min-height:19px}
.paper-kind-badge,.paper-new-badge{display:inline-flex;align-items:center;min-height:18px;padding:2px 7px;border-radius:999px;font-size:.59rem;font-weight:850;line-height:1;text-transform:uppercase;letter-spacing:.025em}
.paper-kind-badge{background:rgba(255,255,255,.14);color:#dff3ff}
.paper-kind-badge[data-kind="answer"]{background:rgba(239,255,211,.18);color:#e8ffc7}
.paper-kind-badge[data-kind="material"]{background:rgba(255,236,194,.18);color:#ffedc6}
.paper-new-badge{background:#f6d25c;color:#273444}
.paper-list-title{font-size:.91rem;line-height:1.28;white-space:normal;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.paper-list-meta{overflow:hidden;font-size:.66rem;line-height:1.35;text-overflow:ellipsis;white-space:nowrap}

/* --- PDF reader: fit-width, page jump, scrubber, night mode, study tools --- */
.viewer-body{overflow:hidden;background:#151b23}
.viewer-topbar{min-height:68px;grid-template-columns:auto minmax(0,1fr) auto;padding-top:max(10px,env(safe-area-inset-top));background:rgba(6,27,51,.975)}
.viewer-page-button{min-width:62px;height:38px;padding:0 10px;border:1px solid rgba(255,255,255,.14);border-radius:11px;background:rgba(255,255,255,.07);color:#eef6ff;font-size:.72rem;font-weight:850}
.viewer-page-button:hover:not(:disabled){background:rgba(255,255,255,.12)}
.viewer-page-button:disabled{opacity:.48}
.pdf-viewer-stage{inset:calc(68px + env(safe-area-inset-top)) 0 0;overflow:auto;padding:0 16px 108px;background:#252c35;overscroll-behavior:contain;touch-action:pan-x pan-y pinch-zoom;scrollbar-gutter:stable both-edges}
.pdf-pages{display:grid;gap:0;justify-items:center;min-width:100%;width:max-content;margin:0 auto}
.pdf-page-wrap{width:max-content;min-width:100%;max-width:none;display:grid;justify-items:center;border-bottom:1px solid rgba(255,255,255,.055)}
.pdf-page-skeleton{max-width:none}
.pdf-page-canvas{display:block;max-width:none!important;height:auto!important;background:#fff;box-shadow:none;user-select:none;-webkit-user-select:none;transition:filter .18s ease}
.viewer-night .pdf-viewer-stage{background:#11161c}
.viewer-night .pdf-page-canvas{filter:invert(.90) hue-rotate(180deg) brightness(.94) contrast(1.02)}
.viewer-loading,.viewer-error{min-width:min(620px,calc(100vw - 28px));min-height:calc(100vh - 170px);padding:40px 20px}
.viewer-progress{width:min(300px,75vw);height:5px;margin-top:12px;overflow:hidden;border-radius:999px;background:rgba(255,255,255,.10)}
.viewer-progress span{display:block;width:18%;height:100%;border-radius:inherit;background:linear-gradient(90deg,#5aa469,#2e8bd2);transition:width .2s ease}
.viewer-bottom-toolbar{position:fixed;z-index:40;left:50%;bottom:max(16px,env(safe-area-inset-bottom));display:flex;align-items:center;gap:5px;padding:6px;border:1px solid rgba(255,255,255,.12);border-radius:17px;background:rgba(6,27,51,.95);box-shadow:0 18px 44px rgba(0,0,0,.34);backdrop-filter:blur(16px);transform:translateX(-50%)}
.viewer-bottom-toolbar button{min-width:42px;height:42px;display:inline-flex;align-items:center;justify-content:center;gap:5px;padding:0 10px;border:0;border-radius:11px;background:transparent;color:#eaf3fc;font-size:.78rem;font-weight:800}
.viewer-bottom-toolbar button:hover:not(:disabled){background:rgba(255,255,255,.08)}
.viewer-bottom-toolbar button:disabled{opacity:.35}
.viewer-bottom-toolbar button.is-active{background:rgba(90,164,105,.22);color:#c7f1d0}
.viewer-bottom-toolbar .icon{width:18px;height:18px}
.viewer-bottom-toolbar .viewer-zoom-level{min-width:58px;background:rgba(255,255,255,.07);color:#cfe0ef;font-size:.7rem}
.viewer-study-actions{position:fixed;z-index:39;left:18px;bottom:96px;display:grid;gap:8px}
.viewer-study-action{min-width:112px;min-height:43px;display:flex;align-items:center;gap:8px;padding:6px 11px;border:1px solid rgba(255,255,255,.12);border-radius:13px;background:rgba(6,27,51,.94);color:#eaf4fd;box-shadow:0 12px 30px rgba(0,0,0,.25);backdrop-filter:blur(12px)}
.viewer-study-action>span{width:27px;height:27px;display:grid;place-items:center;border-radius:9px;background:#f4c84d;color:#253448;font-size:.7rem;font-weight:900}
.viewer-study-action-ai>span{background:#79c38c;color:#12381e}
.viewer-study-action strong{font-size:.72rem}
.viewer-study-action:disabled{opacity:.48}
.viewer-scrubber{position:fixed;z-index:38;top:calc(88px + env(safe-area-inset-top));right:7px;bottom:104px;width:28px;pointer-events:none}
.viewer-scrubber-track{position:absolute;top:11px;bottom:11px;left:50%;width:24px;cursor:pointer;pointer-events:auto;transform:translateX(-50%)}
.viewer-scrubber-track::before{content:"";position:absolute;top:0;bottom:0;left:50%;width:3px;border-radius:999px;background:rgba(255,255,255,.16);transform:translateX(-50%)}
.viewer-scrubber-thumb{position:absolute;left:50%;top:0;width:14px;height:22px;border:2px solid rgba(255,255,255,.72);border-radius:999px;background:#1778ca;box-shadow:0 4px 12px rgba(0,0,0,.28);transform:translate(-50%,-50%);transition:top .12s linear}
.viewer-scrubber-bubble{position:absolute;right:26px;top:50%;display:none;min-width:54px;padding:5px 8px;border-radius:9px;background:#061b33;color:#fff;font-size:.66rem;font-weight:800;text-align:center;transform:translateY(-50%);box-shadow:0 8px 20px rgba(0,0,0,.25)}
.viewer-scrubber.is-dragging .viewer-scrubber-bubble{display:block}
.viewer-page-dialog{width:min(390px,calc(100vw - 28px));padding:0;border:1px solid #dce5ee;border-radius:20px;background:#fff;color:var(--ink-800);box-shadow:0 30px 80px rgba(0,0,0,.30)}
.viewer-page-dialog::backdrop{background:rgba(4,17,31,.58);backdrop-filter:blur(4px)}
.viewer-page-dialog form{display:grid;gap:13px;padding:20px}
.viewer-dialog-head{display:flex;align-items:center;justify-content:space-between;gap:15px}
.viewer-dialog-head>div{display:grid;gap:2px}
.viewer-dialog-head span{color:var(--primary-700);font-size:.66rem;font-weight:850;text-transform:uppercase;letter-spacing:.05em}
.viewer-dialog-head strong{font-family:"Manrope",sans-serif;font-size:1.05rem}
.viewer-dialog-head>button{width:34px;height:34px;border:0;border-radius:10px;background:#f1f5f9;color:var(--ink-700);font-size:1.2rem}
.viewer-page-dialog label{font-size:.75rem;font-weight:800}
.viewer-page-dialog input{width:100%;height:48px;padding:0 13px;border:1px solid #ccd8e4;border-radius:12px;outline:0;font:700 .95rem "DM Sans",sans-serif}
.viewer-page-dialog input:focus{border-color:var(--primary-600);box-shadow:0 0 0 4px rgba(23,120,202,.10)}
.viewer-page-dialog input[aria-invalid="true"]{border-color:#c84545}
.viewer-page-dialog small{color:var(--ink-500);font-size:.7rem}
.viewer-dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:5px}
.viewer-dialog-actions .button{min-height:42px;padding:0 13px;font-size:.75rem}

@media(max-width:780px){
  .countdown-calendar span{display:none}
  .countdown-calendar{width:36px;padding:0;justify-content:center}
  .resource-toolbar-compact{grid-template-columns:1fr 1fr}
  .resource-toolbar-compact .field:first-child{grid-column:1/-1}
  .resource-filter-strip{padding-inline:14px}
  .resource-filter-label{width:36px}
  .paper-list-item{min-height:78px}
  .viewer-topbar{gap:7px}
  .viewer-page-button{min-width:54px;padding-inline:7px;font-size:.67rem}
  .viewer-heading strong{font-size:.76rem}
  .viewer-heading span{display:block;font-size:.62rem}
  .pdf-viewer-stage{padding-inline:4px;padding-bottom:124px;scrollbar-gutter:auto}
  .viewer-bottom-toolbar{bottom:max(10px,env(safe-area-inset-bottom));max-width:calc(100vw - 18px);gap:2px;padding:5px}
  .viewer-bottom-toolbar button{min-width:38px;height:40px;padding-inline:8px}
  .viewer-bottom-toolbar button span{display:none}
  .viewer-study-actions{left:10px;right:38px;bottom:66px;display:flex;justify-content:flex-start;gap:6px}
  .viewer-study-action{min-width:0;min-height:39px;padding:5px 9px}
  .viewer-study-action>span{width:25px;height:25px}
  .viewer-study-action strong{font-size:.67rem}
  .viewer-scrubber{top:82px;right:3px;bottom:116px;width:24px}
}

@media(max-width:540px){
  .resource-continue{grid-template-columns:38px minmax(0,1fr);padding:12px 13px}
  .resource-continue .button{grid-column:2;justify-self:start;min-height:36px}
  .resource-library-status{grid-template-columns:auto minmax(0,1fr);padding:11px 13px}
  .resource-library-status .resource-refresh{grid-column:2;justify-self:start;margin-top:3px}
  .resource-toolbar-compact{grid-template-columns:1fr}
  .resource-toolbar-compact .field:first-child{grid-column:auto}
  .resource-filter-strip{align-items:flex-start;flex-direction:column;gap:6px}
  .resource-filter-label{width:auto}
  .resource-grade-chips{width:100%}
  .paper-list-meta{display:block!important;font-size:.6rem;white-space:nowrap}
  .paper-list-item{grid-template-columns:36px minmax(0,1fr) 24px;padding:9px 9px}
  .paper-list-icon{width:34px;height:34px}
  .paper-kind-badge,.paper-new-badge{font-size:.54rem}
  .viewer-back{width:38px;height:38px}
  .viewer-page-button{min-width:50px;height:36px}
  .viewer-heading strong{font-size:.71rem}
  .viewer-heading span{font-size:.58rem}
  .viewer-bottom-toolbar .viewer-zoom-level{min-width:50px}
  .viewer-study-action strong{display:none}
  .viewer-study-action{width:38px;height:38px;padding:5px;justify-content:center;border-radius:12px}
  .viewer-study-action>span{width:27px;height:27px}
  .exam-card-head{align-items:flex-start;flex-direction:column;gap:7px}
  .exam-state-badge{align-self:flex-start}
}
.exam-date{display:block;color:var(--primary-700)!important;font-size:.84rem!important;font-weight:800}

/* ===== Quiz Bank — modern web adaptation of the MathGuide Android quiz flow ===== */
.quiz-bank-hero{padding:72px 0 76px}
.quiz-bank-hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(320px,.72fr);align-items:center;gap:54px}
.quiz-bank-hero-copy{max-width:none}
.quiz-bank-hero h1{max-width:780px}
.quiz-hero-badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.quiz-hero-badges span{display:inline-flex;align-items:center;min-height:33px;padding:6px 11px;border:1px solid rgba(255,255,255,.13);border-radius:999px;background:rgba(255,255,255,.065);color:#dce9f7;font-size:.71rem;font-weight:800;box-shadow:inset 0 1px 0 rgba(255,255,255,.04)}
.quiz-hero-card{padding:24px;border:1px solid rgba(255,255,255,.14);border-radius:26px;background:linear-gradient(160deg,rgba(255,255,255,.12),rgba(255,255,255,.05));box-shadow:0 28px 72px rgba(0,0,0,.22);backdrop-filter:blur(14px)}
.quiz-hero-card-top{display:grid;gap:4px}.quiz-hero-card-top span{color:#9fb9d3;font-size:.68rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}.quiz-hero-card-top strong{color:#fff;font-family:"Manrope",sans-serif;font-size:1.12rem;line-height:1.35}
.quiz-hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:20px 0 16px}.quiz-hero-metrics>div{min-width:0;padding:13px 9px;border:1px solid rgba(255,255,255,.09);border-radius:15px;background:rgba(3,18,33,.28);text-align:center}.quiz-hero-metrics strong{display:block;color:#9ad1a8;font-family:"Manrope",sans-serif;font-size:1.1rem;line-height:1.1}.quiz-hero-metrics span{display:block;margin-top:5px;color:#9eb2c8;font-size:.59rem;font-weight:750;line-height:1.3}
.quiz-hero-card p{margin:0;color:#c7d6e6;font-size:.78rem;line-height:1.65}.quiz-hero-jump{display:inline-flex;margin-top:17px;color:#fff;font-size:.76rem;font-weight:900}
.quiz-bank-section{padding-top:62px;background:linear-gradient(180deg,#f7f9fc 0,#f3f6fb 100%)}
.quiz-bank-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:18px}.quiz-bank-head h2{margin-bottom:6px}.quiz-subject-count{flex:0 0 auto;padding:8px 12px;border:1px solid #d8e2ec;border-radius:999px;background:#fff;color:var(--primary-700);font-size:.74rem;font-weight:900;box-shadow:0 5px 16px rgba(16,24,40,.05)}
.quiz-search-shell{position:sticky;top:82px;z-index:18;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;margin:0 0 18px;padding:10px;border:1px solid rgba(208,213,221,.78);border-radius:18px;background:rgba(247,249,252,.9);box-shadow:0 10px 30px rgba(16,24,40,.06);backdrop-filter:blur(14px)}
.quiz-search-field{position:relative;margin:0}.quiz-search-field .icon{position:absolute;z-index:2;left:15px;top:50%;transform:translateY(-50%);width:18px;color:var(--ink-500)}.quiz-search-field input{width:100%;height:50px;padding:0 16px 0 44px;border:1px solid #d7e0ea;border-radius:13px;background:#fff;color:var(--ink-950);outline:0;box-shadow:inset 0 1px 2px rgba(16,24,40,.02)}.quiz-search-field input:focus{border-color:#8bb8e4;box-shadow:0 0 0 4px rgba(20,115,206,.10)}
.quiz-share-bank{min-height:50px;white-space:nowrap;background:#fff}
.quiz-featured{position:relative;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:17px;margin-bottom:22px;padding:20px 22px;overflow:hidden;border:1px solid rgba(20,115,206,.2);border-radius:24px;background:radial-gradient(circle at 92% 10%,rgba(130,205,153,.22),transparent 18rem),linear-gradient(135deg,#082b51,#0a5680);color:#fff;box-shadow:0 20px 46px rgba(8,49,86,.16)}
.quiz-featured::after{content:"";position:absolute;right:-42px;bottom:-62px;width:170px;height:170px;border:1px solid rgba(255,255,255,.08);border-radius:50%}
.quiz-featured-icon{position:relative;z-index:1;width:54px;height:54px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.12);border-radius:17px;background:rgba(255,255,255,.11);font-size:1.45rem;box-shadow:inset 0 1px 0 rgba(255,255,255,.08)}
.quiz-featured-copy{position:relative;z-index:1;min-width:0}.quiz-featured-copy>span{display:block;margin-bottom:2px;color:#a9cce4;font-size:.67rem;font-weight:900;letter-spacing:.075em;text-transform:uppercase}.quiz-featured-copy h3{margin:0;color:#fff;font-size:1.08rem}.quiz-featured-copy p{margin:3px 0 0;color:#d3e4f1;font-size:.77rem}.quiz-featured .button-light{position:relative;z-index:1;min-height:44px;border:1px solid rgba(255,255,255,.16);background:#fff;color:var(--primary-800);box-shadow:none}
.quiz-bank-state{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.quiz-subject-skeleton{height:164px;border-radius:21px}
.quiz-category-list{display:grid;gap:34px}.quiz-category-block{display:grid;gap:14px}.quiz-category-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:0 2px 10px;border-bottom:1px solid #dde5ee}.quiz-category-heading h2{margin:0;font-size:1.12rem;letter-spacing:-.02em}.quiz-category-heading span{padding:5px 8px;border-radius:999px;background:#eaf0f6;color:var(--ink-600);font-size:.65rem;font-weight:850}
.quiz-subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.quiz-subject-card{position:relative;min-width:0;overflow:hidden;border:1px solid #dfe6ee;border-radius:21px;background:#fff;box-shadow:0 6px 22px rgba(16,24,40,.055);transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}.quiz-subject-card::before{content:"";position:absolute;z-index:1;inset:0 0 auto;height:4px;background:var(--quiz-accent,#1565c0)}.quiz-subject-card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--quiz-accent,#1565c0) 38%,#dfe6ee);box-shadow:0 16px 36px rgba(16,24,40,.10)}
.quiz-subject-open{width:100%;min-height:160px;display:grid;grid-template-rows:auto 1fr auto;gap:12px;padding:19px 18px 17px;border:0;background:transparent;text-align:left;color:var(--ink-950)}
.quiz-subject-icon{width:45px;height:45px;display:grid;place-items:center;border:1px solid color-mix(in srgb,var(--quiz-accent,#1565c0) 20%,#e5e7eb);border-radius:14px;background:color-mix(in srgb,var(--quiz-accent,#1565c0) 8%,#fff);font-size:1.28rem}
.quiz-subject-copy{min-width:0;display:grid;align-content:start;gap:4px}.quiz-subject-copy>strong{display:-webkit-box;overflow:hidden;font-family:"Manrope",sans-serif;font-size:.93rem;line-height:1.35;-webkit-line-clamp:2;-webkit-box-orient:vertical}.quiz-subject-copy>small{display:-webkit-box;overflow:hidden;color:var(--ink-600);font-size:.7rem;line-height:1.45;-webkit-line-clamp:2;-webkit-box-orient:vertical}.quiz-subject-meta{display:flex;flex-wrap:wrap;gap:6px;margin-top:7px}.quiz-subject-meta b{padding:4px 7px;border-radius:999px;background:#f1f5f9;color:var(--ink-700);font-size:.6rem;font-weight:850}
.quiz-subject-arrow{position:absolute;right:16px;bottom:16px;width:31px;height:31px;display:grid;place-items:center;border-radius:10px;background:color-mix(in srgb,var(--quiz-accent,#1565c0) 8%,#f8fbff);color:var(--quiz-accent,#1565c0);font-size:1rem;font-weight:900}.quiz-subject-share{position:absolute;z-index:3;right:11px;top:11px;width:33px;height:33px;border:1px solid #dce4ec;border-radius:11px;background:rgba(255,255,255,.94);color:var(--primary-700);font-size:.82rem;font-weight:900;box-shadow:0 4px 12px rgba(16,24,40,.05)}.quiz-subject-share:hover{border-color:#bcd1e6;background:#f6faff}
.quiz-how-section{padding-top:68px}.quiz-how-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.quiz-how-grid>div{position:relative;padding:22px;border:1px solid #e0e7ef;border-radius:21px;background:#fff;box-shadow:0 5px 18px rgba(16,24,40,.045)}.quiz-how-grid strong{width:38px;height:38px;display:grid;place-items:center;margin-bottom:14px;border-radius:12px;background:linear-gradient(135deg,var(--primary-50),#e7f1fb);color:var(--primary-700);font-family:"Manrope",sans-serif;font-size:.72rem}.quiz-how-grid h3{margin-bottom:6px;font-size:.94rem}.quiz-how-grid p{margin:0;color:var(--ink-600);font-size:.76rem;line-height:1.6}

/* Focused quiz session — clean, modern and distraction-light */
.quiz-session-body{min-height:100vh;background:radial-gradient(circle at 8% 0,rgba(20,115,206,.08),transparent 28rem),linear-gradient(180deg,#f7f9fc 0,#eef3f8 100%);color:var(--ink-950);overflow-x:hidden}
.quiz-session-topbar{position:sticky;top:0;z-index:40;min-height:72px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px;padding:10px max(16px,env(safe-area-inset-right)) 10px max(16px,env(safe-area-inset-left));border-bottom:1px solid rgba(213,222,232,.9);background:rgba(255,255,255,.93);box-shadow:0 7px 24px rgba(16,24,40,.055);backdrop-filter:blur(18px)}
.quiz-session-back{display:inline-flex;align-items:center;gap:7px;min-height:42px;padding:0 11px;border:1px solid #d7e0e9;border-radius:12px;background:#fff;color:var(--primary-800);font-size:.72rem;font-weight:850;box-shadow:var(--shadow-sm)}.quiz-session-back:hover{border-color:#adc7e1;background:#f8fbff}.quiz-session-back .icon{width:17px}
.quiz-session-title{min-width:0;display:grid;text-align:center}.quiz-session-title strong{overflow:hidden;color:var(--ink-950);font-family:"Manrope",sans-serif;font-size:.88rem;text-overflow:ellipsis;white-space:nowrap}.quiz-session-title span{color:var(--ink-500);font-size:.65rem}
.quiz-session-tools{display:flex;align-items:center;gap:6px}.quiz-session-tools button{width:40px;height:40px;border:1px solid #d7e0e9;border-radius:12px;background:#fff;color:var(--primary-800);font-weight:900;box-shadow:var(--shadow-sm);transition:border-color .15s ease,background .15s ease,transform .15s ease}.quiz-session-tools button:hover:not(:disabled){transform:translateY(-1px);border-color:#b8cee3;background:#f7fbff}.quiz-session-tools button:disabled{opacity:.38;cursor:not-allowed}.quiz-timer{min-width:68px;padding:9px 10px;border:1px solid #d8e1ea;border-radius:12px;background:#f7f9fc;color:var(--primary-800);font-family:"Manrope",monospace;font-size:.79rem;font-weight:900;text-align:center;font-variant-numeric:tabular-nums}.quiz-timer[data-state="warning"]{border-color:#eed89d;background:#fff8df;color:#8a6100}.quiz-timer[data-state="danger"]{border-color:#f1b4b0;background:#fff1f0;color:#b42318}
.quiz-progress-track{position:sticky;top:72px;z-index:39;height:4px;background:#e4eaf1}.quiz-progress-track span{display:block;width:0;height:100%;border-radius:0 99px 99px 0;background:linear-gradient(90deg,#3f8450,#1473ce);box-shadow:0 0 12px rgba(20,115,206,.18);transition:width .35s ease}
.quiz-session-main{width:min(calc(100% - 32px),900px);margin:0 auto;padding:34px 0 max(62px,env(safe-area-inset-bottom))}
.quiz-loading-panel,.quiz-pause-panel,.quiz-results-panel,.quiz-question-panel{border:1px solid #dfe6ee;border-radius:26px;background:#fff;box-shadow:0 20px 60px rgba(16,24,40,.095)}
.quiz-loading-panel{min-height:390px;display:grid;place-items:center;align-content:center;gap:9px;padding:34px;text-align:center}.quiz-loader-mark,.quiz-state-icon{width:58px;height:58px;display:grid;place-items:center;margin-bottom:5px;border-radius:18px;background:linear-gradient(145deg,var(--green-600),var(--primary-600));color:#fff;font-family:"Manrope",sans-serif;font-size:1.05rem;font-weight:900;box-shadow:0 12px 28px rgba(20,115,206,.20)}.quiz-state-icon-error{background:#fff1f0;color:var(--danger);box-shadow:none;border:1px solid #f3c7c3}.quiz-loading-panel>strong{color:var(--ink-950);font-family:"Manrope",sans-serif;font-size:1.12rem}.quiz-loading-panel>span{color:var(--ink-500);font-size:.77rem}.quiz-loading-dots{display:flex;gap:5px;margin-top:12px}.quiz-loading-dots i{width:7px;height:7px;border-radius:50%;background:#9ebbd5;animation:quizDot 1s infinite ease-in-out}.quiz-loading-dots i:nth-child(2){animation-delay:.12s}.quiz-loading-dots i:nth-child(3){animation-delay:.24s}@keyframes quizDot{0%,80%,100%{opacity:.35;transform:translateY(0)}40%{opacity:1;transform:translateY(-4px)}}
.quiz-question-panel{padding:26px}.quiz-question-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:16px}.quiz-question-context{display:flex;align-items:center;gap:8px}.quiz-question-number{padding:6px 10px;border-radius:999px;background:#eaf4ff;color:var(--primary-700);font-size:.68rem;font-weight:900}.quiz-question-progress{color:var(--ink-500);font-size:.69rem;font-weight:850}.quiz-question-type{padding:6px 9px;border-radius:999px;background:#f4f6f8;color:var(--ink-600);font-size:.61rem;font-weight:800}
.quiz-question-rich{padding:22px;border:1px solid #e0e7ee;border-radius:19px;background:linear-gradient(180deg,#fbfcfe,#f7f9fc);color:var(--ink-950);font-size:1rem;line-height:1.78;box-shadow:inset 0 1px 0 #fff}.quiz-rich-text{overflow-wrap:anywhere}.quiz-rich-text .katex,.quiz-question-rich .katex{color:inherit;font-size:1em}.quiz-question-rich p:last-child,.quiz-rich-text p:last-child{margin-bottom:0}
.quiz-options{display:grid;gap:11px;margin-top:16px}.quiz-option{width:100%;min-height:62px;display:grid;grid-template-columns:42px minmax(0,1fr) 30px;align-items:center;gap:13px;padding:11px 13px;border:1px solid #dce4ec;border-radius:16px;background:#fff;color:var(--ink-800);text-align:left;box-shadow:0 3px 11px rgba(16,24,40,.025);transition:transform .15s ease,border-color .15s ease,background .15s ease,box-shadow .15s ease}.quiz-option:hover:not(:disabled){transform:translateY(-1px);border-color:#8db6dc;background:#f9fcff;box-shadow:0 8px 20px rgba(20,115,206,.075)}.quiz-option:focus-visible{outline:3px solid rgba(20,115,206,.2);outline-offset:2px}.quiz-option:disabled{cursor:default}.quiz-option-letter{width:39px;height:39px;display:grid;place-items:center;border:1px solid #d8e1ea;border-radius:12px;background:#f4f7fa;color:var(--primary-800);font-family:"Manrope",sans-serif;font-size:.76rem;font-weight:900}.quiz-option-letter-0,.quiz-option-letter-1,.quiz-option-letter-2,.quiz-option-letter-3{background:#f2f6fa;color:var(--primary-800)}.quiz-option-text{min-width:0;font-size:.86rem;line-height:1.58}.quiz-option-mark{width:28px;height:28px;display:grid;place-items:center;border-radius:50%;font-size:1rem;font-weight:900;text-align:center}.quiz-option.is-correct{border-color:#85c596;background:#f1fbf4;box-shadow:0 7px 20px rgba(7,148,85,.07)}.quiz-option.is-correct .quiz-option-letter{border-color:#4aa265;background:#3f8450;color:#fff}.quiz-option.is-correct .quiz-option-mark{background:#dff3e4;color:#21723d}.quiz-option.is-wrong{border-color:#e7aaa5;background:#fff5f4}.quiz-option.is-wrong .quiz-option-letter{border-color:#d56760;background:#c8433a;color:#fff}.quiz-option.is-wrong .quiz-option-mark{background:#fde4e2;color:#b42318}
.quiz-feedback{min-height:0;margin-top:0;padding:0;border-radius:13px;font-size:.76rem;font-weight:800;transition:margin .15s ease,padding .15s ease}.quiz-feedback:not(:empty){margin-top:13px;padding:10px 12px}.quiz-feedback.is-correct{background:#edf9f1;color:#246d39}.quiz-feedback.is-wrong{background:#fff2f1;color:#a5322a}.quiz-feedback.is-time{background:#fff8df;color:#805a00}
.quiz-explanation{margin-top:13px;padding:17px 18px;border:1px solid #cbe5d3;border-radius:16px;background:#f2faf4}.quiz-explanation>strong{display:block;margin-bottom:7px;color:#2f7542;font-family:"Manrope",sans-serif;font-size:.78rem}.quiz-explanation .quiz-rich-text{color:#315c3d;font-size:.82rem;line-height:1.67}
.quiz-question-actions{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:19px;padding-top:17px;border-top:1px solid #e7ecf1}.quiz-question-actions>span{max-width:460px;color:var(--ink-500);font-size:.69rem;line-height:1.45}.quiz-next-button{min-height:45px;flex:0 0 auto;border:1px solid #cbd8e4;background:#fff;color:var(--primary-700);box-shadow:none}.quiz-next-button:hover{border-color:#98b8d7;background:#f5faff}
.quiz-pause-panel{min-height:410px;display:grid;place-items:center;align-content:center;gap:8px;padding:36px;text-align:center}.quiz-pause-symbol{width:58px;height:58px;display:grid;place-items:center;border-radius:18px;background:#eaf4ff;color:var(--primary-700);font-size:1.2rem;font-weight:900}.quiz-pause-panel .section-kicker{margin:6px 0 0}.quiz-pause-panel h2{margin:0;color:var(--ink-950);font-size:1.5rem}.quiz-pause-panel p{margin:0 0 13px;color:var(--ink-600);font-size:.84rem}
.quiz-results-panel{padding:32px}.quiz-result-hero{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:27px;padding-bottom:24px;border-bottom:1px solid #e3e9ef;text-align:left}.quiz-score-ring{--score-pct:0;position:relative;width:154px;height:154px;display:grid;place-items:center;border-radius:50%;background:conic-gradient(var(--primary-600) calc(var(--score-pct) * 1%),#e8edf2 0);box-shadow:0 10px 28px rgba(16,24,40,.08)}.quiz-score-ring::before{content:"";position:absolute;inset:12px;border-radius:50%;background:#fff;box-shadow:inset 0 0 0 1px #eef2f6}.quiz-score-ring>div{position:relative;z-index:1;display:grid;text-align:center}.quiz-score-ring strong{color:var(--ink-950);font-family:"Manrope",sans-serif;font-size:1.7rem;line-height:1}.quiz-score-ring span{margin-top:5px;color:var(--ink-500);font-size:.62rem;font-weight:800;text-transform:uppercase}.quiz-result-copy{min-width:0}.quiz-result-badge{width:45px;height:45px;display:grid;place-items:center;margin:0 0 9px;border-radius:14px;background:linear-gradient(145deg,#eef6ff,#f4fbf5);font-size:1.35rem}.quiz-results-panel .section-kicker{margin-bottom:4px;color:var(--primary-700)}.quiz-results-panel h1{margin:0 0 5px;color:var(--ink-950);font-size:1.55rem}.quiz-result-score{margin:0;color:var(--primary-800);font-family:"Manrope",sans-serif;font-size:1.18rem;font-weight:900}.quiz-result-summary{margin:2px 0 0;color:var(--ink-500);font-size:.78rem}.quiz-result-advice{max-width:590px;margin:10px 0 0;color:var(--ink-700);font-size:.83rem;line-height:1.6}
.quiz-result-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin:22px 0}.quiz-result-stats>div{display:grid;gap:4px;padding:14px 10px;border:1px solid #e1e7ee;border-radius:14px;background:#f9fafc}.quiz-result-stats span{color:var(--ink-500);font-size:.59rem;font-weight:850;text-transform:uppercase}.quiz-result-stats strong{color:var(--ink-950);font-family:"Manrope",sans-serif;font-size:1.02rem}
.quiz-reward-card{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:12px;padding:17px;border:1px solid #efdfa8;border-radius:17px;background:linear-gradient(135deg,#fffaf0,#fffdf8)}.quiz-reward-icon{width:43px;height:43px;display:grid;place-items:center;border-radius:13px;background:#fff0b9;color:#946c00;font-size:1.1rem}.quiz-reward-card>div:last-child{display:grid;gap:2px}.quiz-reward-card span{color:#8d6a08;font-size:.62rem;font-weight:900;text-transform:uppercase}.quiz-reward-card strong{color:#604800;font-family:"Manrope",sans-serif;font-size:1.08rem}.quiz-reward-card small{color:#8d791e;font-size:.69rem}.quiz-bank-size{margin:14px 0 0;color:var(--ink-500);font-size:.69rem;line-height:1.5}.quiz-result-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:20px}.quiz-session-body .button-outline{border-color:#d3dde7;background:#fff;color:var(--primary-700)}.quiz-session-body .button-primary{border:0;color:#fff}

@media(max-width:980px){.quiz-bank-hero-grid{grid-template-columns:1fr;gap:30px}.quiz-hero-card{max-width:620px}.quiz-subject-grid,.quiz-bank-state{grid-template-columns:repeat(2,minmax(0,1fr))}.quiz-how-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){
  .quiz-bank-hero{padding:58px 0 62px}.quiz-bank-head{align-items:flex-start;flex-direction:column;gap:10px}.quiz-search-shell{position:static;grid-template-columns:1fr;padding:0;border:0;background:transparent;box-shadow:none}.quiz-share-bank{justify-self:start}.quiz-featured{grid-template-columns:auto minmax(0,1fr)}.quiz-featured .button{grid-column:2;justify-self:start}.quiz-subject-grid,.quiz-bank-state{grid-template-columns:1fr}.quiz-subject-open{min-height:145px}.quiz-session-topbar{gap:7px}.quiz-session-back span{display:none}.quiz-session-back{width:42px;padding:0;justify-content:center}.quiz-session-title strong{font-size:.76rem}.quiz-session-title span{font-size:.58rem}.quiz-session-tools button{width:36px;height:36px}.quiz-timer{min-width:59px;padding-inline:7px}.quiz-question-panel,.quiz-results-panel{padding:19px}.quiz-session-main{padding-top:24px}.quiz-result-hero{grid-template-columns:1fr;text-align:center;gap:16px}.quiz-score-ring{margin:auto;width:136px;height:136px}.quiz-result-badge{margin-inline:auto}.quiz-result-advice{margin-inline:auto}.quiz-result-stats{grid-template-columns:repeat(2,1fr)}.quiz-result-actions{justify-content:center}
}
@media(max-width:480px){
  .quiz-hero-badges span{font-size:.64rem}.quiz-hero-card{padding:18px}.quiz-hero-metrics{gap:6px}.quiz-hero-metrics>div{padding:11px 5px}.quiz-hero-metrics strong{font-size:.95rem}.quiz-hero-metrics span{font-size:.53rem}.quiz-how-grid{grid-template-columns:1fr}.quiz-subject-card{border-radius:18px}.quiz-subject-open{min-height:138px;padding:17px 16px 15px}.quiz-session-title span{display:none}.quiz-session-tools{gap:4px}.quiz-session-tools button:first-child{display:none}.quiz-session-main{width:min(calc(100% - 20px),900px)}.quiz-question-head{align-items:flex-start}.quiz-question-type{display:none}.quiz-question-rich{padding:17px;font-size:.92rem}.quiz-option{grid-template-columns:36px minmax(0,1fr) 26px;min-height:58px;padding:10px}.quiz-option-letter{width:34px;height:34px}.quiz-question-actions{align-items:stretch;flex-direction:column}.quiz-question-actions>span{order:2}.quiz-next-button{width:100%}.quiz-result-actions{display:grid}.quiz-result-actions>*{width:100%;justify-content:center}.quiz-score-ring{width:126px;height:126px}.quiz-score-ring strong{font-size:1.5rem}
}


/* ===== Resource list refinement: clean titles + fetched filters + mobile FAB ===== */
.paper-list-copy{display:flex;align-items:center;justify-content:space-between;gap:12px;min-width:0}
.paper-list-title{min-width:0;flex:1;color:#fff;font-size:.93rem;font-weight:750;line-height:1.32;text-align:left;white-space:normal;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.paper-updated-year{flex:0 0 auto;display:inline-flex;align-items:center;min-height:24px;padding:3px 8px;border:1px solid rgba(255,255,255,.18);border-radius:999px;background:rgba(255,255,255,.10);color:#e8f5ff;font-size:.62rem;font-weight:850;white-space:nowrap}
.paper-title-line,.paper-list-meta{display:none!important}
.resource-more-fab{display:none}

@media(max-width:780px){
  .page-resources{padding-bottom:82px}
  .resource-more-fab[hidden]{display:none!important}
  .resource-more-fab:not([hidden]){position:fixed;z-index:55;right:max(14px,env(safe-area-inset-right));bottom:max(18px,calc(env(safe-area-inset-bottom) + 14px));display:inline-flex;align-items:center;gap:8px;min-height:48px;padding:0 16px;border:1px solid rgba(255,255,255,.22);border-radius:999px;background:linear-gradient(135deg,#0b4e99,#1778ca);color:#fff;box-shadow:0 14px 34px rgba(6,49,91,.34);font:800 .75rem "DM Sans",sans-serif;letter-spacing:.01em}
  .resource-more-fab .icon{width:18px;height:18px;stroke:currentColor;stroke-width:2;fill:none}
  .resource-more-fab:active{transform:translateY(1px)}
  .load-more-wrap{display:none}
  .paper-list-copy{gap:8px}
  .paper-updated-year{min-height:22px;padding-inline:7px;font-size:.58rem}
}

@media(max-width:430px){
  .paper-list-item{grid-template-columns:34px minmax(0,1fr) 22px;min-height:66px}
  .paper-list-copy{align-items:flex-start;flex-direction:column;justify-content:center;gap:4px}
  .paper-list-title{font-size:.86rem;-webkit-line-clamp:2}
  .paper-updated-year{min-height:19px;padding:2px 6px;font-size:.54rem}
  .resource-more-fab:not([hidden]){right:12px;bottom:max(14px,calc(env(safe-area-inset-bottom) + 10px));min-height:46px;padding-inline:14px}
}