:root {
  --ink: #24304a;
  --muted: #66708a;
  --paper: #ffffff;
  --canvas: #f6f7ff;
  --purple: #5b4bdb;
  --purple-dark: #4537bd;
  --purple-soft: #eeeaff;
  --mint: #14b8a6;
  --mint-soft: #ddfaf5;
  --sky: #2f9ee9;
  --sky-soft: #e5f5ff;
  --orange: #f59e42;
  --orange-soft: #fff2df;
  --rose: #f1687a;
  --rose-soft: #ffe8ec;
  --gold: #e6a91c;
  --gold-soft: #fff7d8;
  --green: #29a86b;
  --green-soft: #e2f8ec;
  --red: #e34f5f;
  --red-soft: #ffeaed;
  --line: #e4e7f2;
  --shadow-sm: 0 5px 15px rgba(47, 43, 94, .07);
  --shadow-md: 0 15px 35px rgba(47, 43, 94, .11);
  --radius-sm: 14px;
  --radius: 22px;
  --radius-lg: 32px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 90% 4%, rgba(91,75,219,.10), transparent 24rem),
    radial-gradient(circle at 15% 90%, rgba(20,184,166,.08), transparent 28rem),
    var(--canvas);
  font-family: "Nunito", "Segoe UI", Arial, sans-serif;
  line-height: 1.55;
  min-width: 320px;
}

button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
button { cursor: pointer; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible {
  outline: 4px solid rgba(47,158,233,.32);
  outline-offset: 3px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link { position: fixed; z-index: 999; top: 10px; left: 10px; padding: 10px 14px; background: var(--ink); color: white; border-radius: 10px; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.app-shell { min-height: 100vh; }
.topbar {
  position: sticky; top: 0; z-index: 30; height: 76px; display: flex; align-items: center;
  justify-content: space-between; padding: 0 28px; background: rgba(255,255,255,.9);
  backdrop-filter: blur(14px); border-bottom: 1px solid rgba(228,231,242,.85);
}
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-mark {
  width: 46px; height: 46px; display: grid; place-items: center; border-radius: 15px;
  color: white; font-size: 25px; font-weight: 900; background: linear-gradient(145deg, var(--purple), var(--mint));
  box-shadow: 0 8px 18px rgba(91,75,219,.24); transform: rotate(-4deg);
}
.brand strong { display: block; color: var(--purple-dark); font-size: 1.18rem; letter-spacing: -.02em; }
.brand small { display: block; color: var(--muted); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.top-actions { display: flex; align-items: center; gap: 10px; }
.language-control select {
  border: 1px solid var(--line); border-radius: 14px; padding: 9px 34px 9px 12px;
  color: var(--ink); background: var(--paper); font-weight: 800;
}
.points-chip {
  display: flex; align-items: center; gap: 5px; min-height: 42px; padding: 8px 13px;
  text-decoration: none; background: var(--gold-soft); border: 1px solid #f2da89; border-radius: 14px;
}
.points-chip strong { color: #9a6a00; font-size: 1.08rem; }
.points-label { font-size: .8rem; color: #8a6714; }
.icon-button { min-height: 42px; border: 1px solid var(--line); border-radius: 14px; padding: 8px 13px; background: white; color: var(--purple); font-weight: 800; }

.side-nav {
  position: fixed; z-index: 20; top: 76px; bottom: 0; left: 0; width: 224px;
  padding: 24px 16px; background: rgba(255,255,255,.74); border-right: 1px solid var(--line);
}
.side-nav > a { display: flex; align-items: center; gap: 12px; padding: 12px 14px; margin-bottom: 7px; text-decoration: none; border-radius: 14px; color: var(--muted); font-weight: 800; }
.side-nav > a span:first-child { font-size: 1.25rem; filter: grayscale(.2); }
.side-nav > a:hover { background: var(--purple-soft); color: var(--purple); }
.side-nav > a.active { color: var(--purple-dark); background: var(--purple-soft); box-shadow: inset 3px 0 var(--purple); }
.side-tip { position: absolute; left: 16px; right: 16px; bottom: 22px; display: flex; gap: 9px; padding: 13px; border-radius: 16px; background: var(--mint-soft); color: #176e63; }
.side-tip p { margin: 0; font-size: .78rem; line-height: 1.4; }

.main-content { margin-left: 224px; min-height: calc(100vh - 76px); padding: 34px clamp(22px, 4vw, 58px) 70px; }
.page { max-width: 1180px; margin: 0 auto; animation: page-in .25s ease both; }
@keyframes page-in { from { opacity: 0; transform: translateY(6px); } }

.bottom-nav { display: none; }
.eyebrow { margin: 0 0 5px; color: var(--purple); font-size: .76rem; font-weight: 900; text-transform: uppercase; letter-spacing: .1em; }
h1, h2, h3 { margin-top: 0; line-height: 1.17; letter-spacing: -.025em; }
h1 { margin-bottom: 13px; font-size: clamp(2rem, 4vw, 3.45rem); }
h2 { margin-bottom: 14px; font-size: clamp(1.45rem, 2vw, 2rem); }
h3 { margin-bottom: 9px; font-size: 1.1rem; }
p { margin-top: 0; }
.muted { color: var(--muted); }
.en-line { display: block; margin-top: 2px; color: var(--muted); font-size: .86em; font-weight: 600; }
.dual-inline .en-line { display: inline; margin-left: 5px; }

.hero {
  position: relative; overflow: hidden; min-height: 310px; display: grid; grid-template-columns: minmax(0,1.2fr) minmax(230px,.8fr);
  align-items: center; gap: 26px; padding: clamp(28px,5vw,54px); margin-bottom: 28px;
  border-radius: var(--radius-lg); color: white; background: linear-gradient(135deg, #5545d2 0%, #7868ea 54%, #23b5a8 100%);
  box-shadow: var(--shadow-md);
}
.hero::before, .hero::after { content: ""; position: absolute; border-radius: 999px; border: 2px solid rgba(255,255,255,.13); }
.hero::before { width: 320px; height: 320px; right: -100px; top: -145px; }
.hero::after { width: 190px; height: 190px; left: 45%; bottom: -145px; }
.hero-copy { position: relative; z-index: 2; }
.hero .eyebrow { color: #d7fff9; }
.hero h1 { max-width: 700px; margin-bottom: 12px; }
.hero p { max-width: 650px; color: rgba(255,255,255,.86); font-size: 1.03rem; }
.hero .en-line { color: rgba(255,255,255,.75); }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.hero-art { position: relative; z-index: 2; min-height: 215px; display: grid; place-items: center; }
.science-orbit { position: relative; width: 210px; height: 210px; border: 2px solid rgba(255,255,255,.34); border-radius: 50%; transform: rotate(-12deg); }
.science-orbit::before { content: ""; position: absolute; inset: 31px -17px; border: 2px dashed rgba(255,255,255,.25); border-radius: 50%; transform: rotate(65deg); }
.mascot { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%) rotate(12deg); width: 112px; height: 112px; display: grid; place-items: center; font-size: 59px; border-radius: 36px; background: rgba(255,255,255,.95); box-shadow: 0 15px 28px rgba(24,25,87,.22); }
.orbit-item { position: absolute; width: 48px; height: 48px; display: grid; place-items: center; font-size: 28px; border-radius: 16px; background: rgba(255,255,255,.95); box-shadow: 0 8px 20px rgba(24,25,87,.2); }
.orbit-item.one { top: -16px; left: 70px; transform: rotate(12deg); }
.orbit-item.two { right: -12px; bottom: 35px; transform: rotate(12deg); }
.orbit-item.three { left: -8px; bottom: 19px; transform: rotate(12deg); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 45px; padding: 10px 17px; border: 0; border-radius: 14px; font-weight: 900; text-decoration: none; transition: transform .15s ease, box-shadow .15s ease, background .15s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: white; background: var(--purple); box-shadow: 0 8px 16px rgba(91,75,219,.22); }
.btn-primary:hover { background: var(--purple-dark); }
.btn-light { color: var(--purple-dark); background: white; box-shadow: 0 8px 18px rgba(24,25,87,.15); }
.btn-soft { color: var(--purple-dark); background: var(--purple-soft); }
.btn-outline { color: var(--purple); background: white; border: 1.5px solid #cfc8ff; }
.btn-green { color: white; background: var(--green); }
.btn-danger { color: var(--red); background: var(--red-soft); }
.btn-small { min-height: 38px; padding: 7px 12px; font-size: .84rem; border-radius: 12px; }
.btn[disabled] { opacity: .55; cursor: not-allowed; transform: none; }

.section-head { display: flex; align-items: end; justify-content: space-between; gap: 18px; margin: 30px 0 16px; }
.section-head h2, .section-head p { margin-bottom: 0; }
.text-link { color: var(--purple); font-weight: 900; text-decoration: none; }
.text-link:hover { text-decoration: underline; }
.grid { display: grid; gap: 17px; }
.year-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.topic-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.stats-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.two-col { display: grid; grid-template-columns: minmax(0,1.4fr) minmax(270px,.6fr); gap: 20px; align-items: start; }

.card { background: var(--paper); border: 1px solid rgba(228,231,242,.9); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.year-card { position: relative; overflow: hidden; min-height: 188px; display: flex; flex-direction: column; padding: 20px; text-decoration: none; transition: transform .18s ease, box-shadow .18s ease; }
.year-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.year-card::after { content: ""; position: absolute; width: 110px; height: 110px; right: -35px; top: -35px; border-radius: 50%; background: var(--tone-soft); }
.year-card .year-top { position: relative; z-index: 2; display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.year-number { width: 55px; height: 55px; display: grid; place-items: center; border-radius: 17px; background: var(--tone-soft); color: var(--tone); font-size: 1.4rem; font-weight: 900; }
.year-card h3 { margin-bottom: 5px; font-size: 1.2rem; }
.year-card p { margin-bottom: 15px; color: var(--muted); font-size: .87rem; }
.year-card .card-foot { margin-top: auto; display: flex; justify-content: space-between; gap: 10px; align-items: center; color: var(--tone); font-weight: 900; font-size: .84rem; }
.tone-mint { --tone: #118f81; --tone-soft: var(--mint-soft); }
.tone-sky { --tone: #167dbc; --tone-soft: var(--sky-soft); }
.tone-violet { --tone: #6952c8; --tone-soft: #eeeaff; }
.tone-orange { --tone: #bd6b19; --tone-soft: var(--orange-soft); }
.tone-rose { --tone: #c94d60; --tone-soft: var(--rose-soft); }
.tone-gold { --tone: #a57400; --tone-soft: var(--gold-soft); }

.progress-track { height: 8px; overflow: hidden; border-radius: 99px; background: #edf0f7; }
.progress-fill { height: 100%; width: var(--progress, 0%); border-radius: inherit; background: var(--tone, var(--purple)); transition: width .4s ease; }
.stat-card { padding: 19px; }
.stat-icon { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 12px; border-radius: 14px; background: var(--purple-soft); font-size: 1.25rem; }
.stat-value { display: block; font-size: 1.7rem; font-weight: 900; line-height: 1; }
.stat-label { color: var(--muted); font-size: .8rem; font-weight: 700; }

.continue-card { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 17px; padding: 20px; margin-top: 23px; }
.continue-icon { width: 61px; height: 61px; display: grid; place-items: center; border-radius: 20px; background: var(--mint-soft); font-size: 30px; }
.continue-card h3, .continue-card p { margin-bottom: 2px; }

.page-header { display: flex; align-items: center; gap: 18px; margin-bottom: 25px; }
.page-header .header-icon { flex: 0 0 auto; width: 74px; height: 74px; display: grid; place-items: center; border-radius: 24px; background: var(--purple-soft); font-size: 38px; }
.page-header h1 { margin: 0 0 4px; }
.back-link { display: inline-flex; align-items: center; gap: 5px; margin-bottom: 13px; color: var(--purple); text-decoration: none; font-weight: 900; }
.year-banner { position: relative; overflow: hidden; display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; padding: 29px; margin-bottom: 24px; color: var(--tone); background: var(--tone-soft); border: 1px solid color-mix(in srgb, var(--tone) 20%, white); border-radius: var(--radius-lg); }
.year-banner::after { content: attr(data-year); position: absolute; right: 24px; top: -40px; color: color-mix(in srgb, var(--tone) 10%, transparent); font-size: 11rem; line-height: 1; font-weight: 900; }
.year-banner > * { position: relative; z-index: 2; }
.year-banner h1 { margin-bottom: 6px; }
.year-banner .progress-box { min-width: 220px; padding: 15px; background: rgba(255,255,255,.62); border-radius: 17px; }
.progress-box p { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: .82rem; font-weight: 900; }

.topic-card { position: relative; min-height: 190px; display: flex; flex-direction: column; padding: 19px; text-decoration: none; transition: transform .18s ease, box-shadow .18s ease; }
.topic-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.topic-card .topic-top { display: flex; justify-content: space-between; align-items: start; margin-bottom: 15px; }
.topic-icon { width: 50px; height: 50px; display: grid; place-items: center; border-radius: 16px; background: var(--tone-soft, var(--purple-soft)); font-size: 27px; }
.topic-card .topic-number { color: #9aa1b4; font-size: .75rem; font-weight: 900; }
.topic-card h3 { margin-bottom: 5px; }
.topic-card p { color: var(--muted); font-size: .8rem; line-height: 1.42; }
.topic-card .topic-foot { margin-top: auto; display: flex; align-items: center; gap: 9px; font-size: .76rem; color: var(--muted); }
.status-dot { width: 9px; height: 9px; border-radius: 99px; background: #ccd1dc; }
.status-dot.done { background: var(--green); box-shadow: 0 0 0 4px var(--green-soft); }
.strand-badge { display: inline-flex; align-items: center; padding: 4px 9px; border-radius: 99px; color: var(--purple-dark); background: var(--purple-soft); font-size: .68rem; font-weight: 900; }

.search-box { position: relative; max-width: 560px; margin-bottom: 24px; }
.search-box span { position: absolute; left: 15px; top: 12px; }
.search-box input { width: 100%; min-height: 48px; padding: 11px 15px 11px 44px; border: 1.5px solid var(--line); border-radius: 16px; background: white; color: var(--ink); }
.search-box input:focus { border-color: var(--purple); }
.filter-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.filter-chip { min-height: 38px; padding: 7px 13px; border: 1px solid var(--line); border-radius: 99px; background: white; color: var(--muted); font-weight: 900; }
.filter-chip.active { color: white; border-color: var(--purple); background: var(--purple); }
.result-note { margin: -10px 0 18px; color: var(--muted); font-size: .85rem; }

.topic-hero { position: relative; overflow: hidden; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px; padding: 25px; margin-bottom: 18px; border-radius: var(--radius-lg); background: linear-gradient(135deg, var(--tone-soft), white); border: 1px solid color-mix(in srgb, var(--tone) 22%, white); }
.topic-hero .topic-big-icon { width: 84px; height: 84px; display: grid; place-items: center; border-radius: 27px; background: white; box-shadow: var(--shadow-sm); font-size: 45px; }
.topic-hero h1 { margin-bottom: 5px; font-size: clamp(1.7rem,3vw,2.6rem); }
.topic-hero p { margin-bottom: 0; color: var(--muted); }
.topic-hero .topic-stars { align-self: start; white-space: nowrap; padding: 8px 12px; border-radius: 14px; color: #9a6a00; background: var(--gold-soft); font-weight: 900; }
.topic-tabs { display: flex; gap: 8px; padding: 7px; margin-bottom: 23px; overflow-x: auto; border: 1px solid var(--line); border-radius: 17px; background: white; box-shadow: var(--shadow-sm); }
.topic-tabs a { flex: 1 0 auto; min-height: 44px; display: flex; align-items: center; justify-content: center; gap: 7px; padding: 9px 13px; border-radius: 12px; text-decoration: none; color: var(--muted); font-weight: 900; }
.topic-tabs a.active { color: white; background: var(--purple); }

.content-card { padding: clamp(20px,3vw,30px); margin-bottom: 18px; }
.intro-card { display: flex; align-items: flex-start; gap: 17px; }
.intro-card .bubble { flex: 0 0 auto; width: 51px; height: 51px; display: grid; place-items: center; border-radius: 16px; background: var(--sky-soft); font-size: 26px; }
.intro-card p { margin-bottom: 0; font-size: 1.03rem; }
.fact-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
.fact-card { position: relative; padding: 22px 20px 20px; overflow: hidden; }
.fact-number { position: absolute; top: 14px; right: 16px; color: #e4e5ef; font-size: 2rem; line-height: 1; font-weight: 900; }
.concept-kicker { display: block; margin-bottom: 7px; color: var(--purple); font-size: .68rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.fact-card h3 { padding-right: 34px; color: var(--purple-dark); }
.fact-card p { margin-bottom: 0; color: var(--muted); }
.concept-cue { display: grid; gap: 3px; margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line); color: var(--muted); font-size: .78rem; }
.concept-cue strong { color: var(--orange); }
.deep-note-card { border-top: 4px solid var(--sky); background: linear-gradient(180deg,var(--sky-soft),white 44%); }
.application-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
.application-note-card { display: flex; align-items: flex-start; gap: 14px; padding: 21px; border-top: 4px solid var(--gold); background: linear-gradient(180deg,var(--gold-soft),white 48%); }
.application-note-card > div { min-width: 0; }
.application-note-card > div > p { color: var(--muted); }
.application-icon { flex: 0 0 auto; width: 44px; height: 44px; display: grid; place-items: center; border-radius: 14px; background: white; box-shadow: var(--shadow-sm); font-size: 23px; }
.reasoning-box { padding: 13px 14px; border-radius: 14px; color: #315d78; background: var(--sky-soft); }
.reasoning-box strong { display: block; margin-bottom: 4px; color: var(--purple-dark); font-size: .76rem; letter-spacing: .04em; text-transform: uppercase; }
.reasoning-box p { margin: 0; color: #315d78; font-size: .88rem; }
.comparison-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
.comparison-note-card { padding: 21px; border-top: 4px solid var(--purple); background: linear-gradient(180deg,var(--purple-soft),white 46%); }
.comparison-note-card h3 { font-size: 1.05rem; }
.comparison-lines { display: grid; gap: 9px; }
.comparison-lines p { display: grid; gap: 3px; margin: 0; padding: 11px 12px; border-radius: 12px; background: white; }
.comparison-lines strong { color: var(--purple-dark); }
.comparison-lines span { color: var(--muted); font-size: .84rem; }
.curriculum-focus-card { display: flex; align-items: flex-start; gap: 16px; padding: 22px 25px; margin: 23px 0 0; color: #315d78; background: linear-gradient(135deg,var(--sky-soft),white); }
.curriculum-focus-card > span { flex: 0 0 auto; width: 50px; height: 50px; display: grid; place-items: center; border-radius: 16px; background: white; font-size: 27px; box-shadow: var(--shadow-sm); }
.curriculum-focus-card h2 { margin-bottom: 5px; color: var(--ink); font-size: 1.25rem; }
.curriculum-focus-card p:last-child { margin-bottom: 0; }
.notes-overview-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 23px; }
.notes-panel { position: relative; overflow: hidden; padding: clamp(21px,3vw,28px); }
.notes-panel-icon { position: absolute; right: 18px; top: 17px; font-size: 27px; }
.notes-panel h2 { padding-right: 38px; font-size: 1.24rem; }
.objective-list { display: grid; gap: 10px; margin: 17px 0 0; padding: 0; list-style: none; }
.objective-list li { display: flex; align-items: flex-start; gap: 9px; color: var(--muted); }
.objective-list li > span:first-child { flex: 0 0 auto; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 8px; color: #17734b; background: var(--green-soft); font-weight: 900; }
.objective-list strong { color: var(--ink); }
.concept-map { display: flex; align-items: stretch; gap: 7px; margin-top: 18px; overflow-x: auto; padding-bottom: 5px; }
.concept-node { flex: 1 0 118px; display: flex; flex-direction: column; justify-content: center; min-height: 78px; padding: 11px; border-radius: 14px; color: var(--purple-dark); background: var(--purple-soft); font-size: .79rem; font-weight: 900; }
.concept-node small { color: var(--muted); }
.concept-node .en-line { font-size: .86em; }
.concept-arrow { align-self: center; color: #a8adbd; font-weight: 900; }
.revision-table-card { overflow: hidden; margin-bottom: 20px; }
.table-scroll { overflow-x: auto; }
.revision-table { width: 100%; border-collapse: collapse; }
.revision-table th, .revision-table td { padding: 16px 18px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.revision-table th { color: var(--purple-dark); background: var(--purple-soft); font-size: .76rem; letter-spacing: .05em; text-transform: uppercase; }
.revision-table td:first-child { width: 32%; color: var(--purple-dark); }
.revision-table td { color: var(--muted); }
.exam-tip { display: flex; gap: 12px; padding: 17px 18px; color: #78590c; background: var(--gold-soft); }
.exam-tip > span { font-size: 25px; }
.exam-tip p { margin: 3px 0 0; font-size: .84rem; }
.activity-card { position: relative; overflow: hidden; padding: 25px; border-color: #f0d979; background: linear-gradient(135deg,var(--gold-soft),white); }
.activity-card::after { content: "🧪"; position: absolute; right: 18px; bottom: -20px; opacity: .13; font-size: 94px; transform: rotate(-12deg); }
.activity-card > * { position: relative; z-index: 2; }
.activity-card h3 { color: #8b650c; }
.note-actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.safety-note { display: flex; gap: 10px; padding: 14px; margin-top: 14px; border-radius: 14px; background: var(--rose-soft); color: #9a4050; font-size: .83rem; }
.mastery-panel { display: grid; grid-template-columns: minmax(220px,.8fr) minmax(0,1.2fr); gap: 20px; align-items: start; padding: clamp(21px,3vw,28px); margin-top: 20px; }
.mastery-panel h2 { margin-bottom: 0; font-size: 1.18rem; }
.mastery-list { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.mastery-check { display: flex; align-items: center; gap: 9px; min-height: 45px; padding: 9px 11px; border: 1px solid var(--line); border-radius: 12px; color: var(--muted); font-size: .82rem; font-weight: 800; cursor: pointer; }
.mastery-check:has(input:checked) { color: #17734b; border-color: #8bdab4; background: var(--green-soft); }
.mastery-check input { width: 18px; height: 18px; accent-color: var(--green); }

.game-shell { padding: clamp(20px,3vw,30px); }
.mode-picker { display: flex; gap: 9px; flex-wrap: wrap; margin: 18px 0 24px; }
.mode-button { min-height: 43px; padding: 9px 14px; border: 1px solid var(--line); border-radius: 13px; color: var(--muted); background: white; font-weight: 900; }
.mode-button.active { color: white; border-color: var(--purple); background: var(--purple); }
.game-scorebar { display: flex; justify-content: space-between; gap: 14px; margin-bottom: 16px; color: var(--muted); font-size: .85rem; font-weight: 900; }
.match-grid { display: grid; grid-template-columns: minmax(130px,.6fr) minmax(0,1.4fr); gap: 12px; }
.match-column { display: grid; gap: 10px; align-content: start; }
.match-card { width: 100%; min-height: 70px; padding: 13px 15px; text-align: left; border: 2px solid var(--line); border-radius: 15px; color: var(--ink); background: white; transition: .15s ease; }
.match-card:hover { border-color: #c9c2ff; }
.match-card.term { font-weight: 900; }
.match-card.selected { color: var(--purple-dark); border-color: var(--purple); background: var(--purple-soft); transform: scale(1.02); }
.match-card.matched { color: #17734b; border-color: #7ad6aa; background: var(--green-soft); }
.match-card.wrong { animation: shake .32s ease; border-color: var(--red); background: var(--red-soft); }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }
.game-complete { padding: 29px; text-align: center; border-radius: var(--radius); background: var(--green-soft); }
.game-complete .big-emoji { font-size: 55px; }
.tf-card { max-width: 680px; margin: 0 auto; padding: 28px; text-align: center; border: 2px solid var(--line); border-radius: var(--radius); background: white; }
.tf-card .tf-term { display: inline-block; margin-bottom: 14px; padding: 6px 11px; color: var(--purple-dark); background: var(--purple-soft); border-radius: 99px; font-weight: 900; }
.tf-card .tf-statement { min-height: 82px; display: grid; place-items: center; font-size: 1.15rem; font-weight: 800; }
.tf-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; }
.tf-actions button { min-height: 56px; border: 0; border-radius: 16px; font-weight: 900; }
.true-button { color: #116d46; background: var(--green-soft); }
.false-button { color: #a43242; background: var(--red-soft); }

.quiz-shell { max-width: 1180px; margin: 0 auto; }
.quiz-meta { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin-bottom: 11px; color: var(--muted); font-size: .85rem; font-weight: 900; }
.revision-intro { display: flex; align-items: center; justify-content: space-between; gap: 22px; padding: 22px 25px; margin-bottom: 16px; background: linear-gradient(135deg,var(--purple-soft),white); }
.revision-intro h2, .revision-intro p { margin-bottom: 4px; }
.answer-count { flex: 0 0 auto; min-width: 105px; padding: 13px; text-align: center; border-radius: 17px; color: var(--purple-dark); background: white; box-shadow: var(--shadow-sm); }
.answer-count strong { display: block; font-size: 1.45rem; line-height: 1.1; }
.answer-count span { color: var(--muted); font-size: .72rem; font-weight: 900; }
.revision-source-note { display: inline-flex; margin: 7px 0 0 !important; padding: 7px 10px; border-radius: 10px; color: #315d78; background: var(--sky-soft); font-size: .76rem; font-weight: 800; }
.quiz-layout { display: grid; grid-template-columns: 275px minmax(0,1fr); gap: 17px; align-items: start; }
.question-nav-panel { position: sticky; top: 94px; padding: 19px; }
.question-nav-head { display: flex; justify-content: space-between; align-items: end; gap: 10px; margin-bottom: 15px; }
.question-nav-head p { margin-bottom: 2px; }
.question-nav-head > span { color: var(--muted); font-size: .72rem; font-weight: 900; }
.question-map { display: grid; grid-template-columns: repeat(5,1fr); gap: 7px; }
.question-number { aspect-ratio: 1; min-width: 0; border: 1px solid var(--line); border-radius: 10px; color: var(--muted); background: #f7f8fc; font-size: .78rem; font-weight: 900; }
.question-number:hover { color: var(--purple); border-color: #bcb4f7; }
.question-number.answered { color: #176f4a; border-color: #9bdcbd; background: var(--green-soft); }
.question-number.current { color: white; border-color: var(--purple); background: var(--purple); box-shadow: 0 0 0 3px var(--purple-soft); }
.question-number.correct { color: #176f4a; border-color: var(--green); background: var(--green-soft); }
.question-number.wrong { color: #9a4050; border-color: var(--red); background: var(--red-soft); }
.question-number.current.correct, .question-number.current.wrong { color: white; border-color: var(--purple); background: var(--purple); }
.question-map-tip { margin: 15px 0 0; color: var(--muted); font-size: .74rem; }
.question-type { padding: 4px 9px; border-radius: 99px; color: var(--purple-dark); background: var(--purple-soft); font-size: .7rem; }
.question-tags { display: flex; justify-content: flex-end; gap: 6px; flex-wrap: wrap; }
.question-construct, .question-difficulty { padding: 4px 9px; border-radius: 99px; font-size: .7rem; }
.question-construct { color: #315d78; background: var(--sky-soft); }
.question-difficulty { color: #176f4a; background: var(--green-soft); }
.question-difficulty.difficultyMedium { color: #72540d; background: var(--gold-soft); }
.question-difficulty.difficultyHigh { color: #9a4050; background: var(--red-soft); }
.quiz-question { padding: clamp(22px,4vw,34px); }
.question-label { display: inline-block; margin-bottom: 10px; color: var(--purple); font-size: .76rem; text-transform: uppercase; letter-spacing: .08em; font-weight: 900; }
.quiz-question h2 { font-size: clamp(1.25rem,2.5vw,1.7rem); }
.answer-list { display: grid; gap: 10px; margin-top: 22px; }
.answer-option { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 58px; padding: 12px 15px; text-align: left; border: 2px solid var(--line); border-radius: 15px; background: white; color: var(--ink); font-weight: 800; }
.answer-option:hover:not([disabled]) { border-color: #b9afff; background: #faf9ff; }
.answer-letter { flex: 0 0 auto; width: 33px; height: 33px; display: grid; place-items: center; border-radius: 10px; color: var(--purple); background: var(--purple-soft); font-weight: 900; }
.answer-option.selected { color: var(--purple-dark); border-color: var(--purple); background: var(--purple-soft); box-shadow: 0 0 0 2px rgba(91,75,219,.08); }
.answer-option.selected .answer-letter { color: white; background: var(--purple); }
.answer-option.correct { border-color: var(--green); background: var(--green-soft); }
.answer-option.wrong { border-color: var(--red); background: var(--red-soft); }
.feedback-box { display: flex; align-items: flex-start; gap: 10px; margin-top: 18px; padding: 14px; border-radius: 14px; font-weight: 700; }
.feedback-box.correct { color: #176f4a; background: var(--green-soft); }
.feedback-box.wrong { color: #9a4050; background: var(--red-soft); }
.feedback-box p { margin: 0; }
.quiz-next { display: flex; justify-content: flex-end; margin-top: 17px; }
.quiz-navigation { display: flex; align-items: center; gap: 9px; margin-top: 20px; flex-wrap: wrap; }
.quiz-navigation #submitQuiz { margin-left: auto; }
.incomplete-banner { display: flex; gap: 13px; padding: 17px 19px; margin-bottom: 16px; border: 1px solid #f0cf72; border-radius: 16px; color: #72540d; background: var(--gold-soft); }
.incomplete-banner > span { font-size: 24px; }
.incomplete-banner p { margin: 3px 0 10px; }
.incomplete-banner .btn + .btn { margin-left: 7px; }
.result-summary { display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: center; padding: 22px 26px; margin-bottom: 16px; background: linear-gradient(135deg,var(--green-soft),white); }
.result-summary .result-ring { width: 105px; height: 105px; margin: 0; }
.result-summary h2, .result-summary p { margin-bottom: 4px; }
.result-summary .result-actions { justify-content: flex-start; margin-top: 10px; }
.result-card { padding: 35px; text-align: center; }
.result-ring { --score: 0; width: 130px; height: 130px; display: grid; place-items: center; margin: 0 auto 18px; border-radius: 50%; background: conic-gradient(var(--green) calc(var(--score)*1%), #e9ecf4 0); position: relative; }
.result-ring::after { content: ""; position: absolute; inset: 12px; border-radius: 50%; background: white; }
.result-ring strong { position: relative; z-index: 2; font-size: 1.6rem; }
.result-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-top: 21px; }

.progress-hero { display: grid; grid-template-columns: 1fr auto; gap: 25px; align-items: center; padding: clamp(25px,4vw,38px); margin-bottom: 23px; background: linear-gradient(135deg,var(--purple-soft),white); }
.level-orb { width: 132px; height: 132px; display: grid; place-items: center; text-align: center; border-radius: 50%; background: linear-gradient(145deg,var(--purple),#8678ee); color: white; box-shadow: 0 13px 28px rgba(91,75,219,.25); }
.level-orb strong { display: block; font-size: 2.1rem; line-height: 1; }
.level-orb small { display: block; opacity: .82; }
.year-progress-list { display: grid; gap: 12px; }
.year-progress-row { display: grid; grid-template-columns: 105px 1fr 48px; gap: 14px; align-items: center; padding: 15px 17px; }
.year-progress-row strong { color: var(--tone); }
.year-progress-row span:last-child { text-align: right; color: var(--muted); font-size: .8rem; font-weight: 900; }
.badge-grid { grid-template-columns: repeat(4,minmax(0,1fr)); }
.badge-card { padding: 19px; text-align: center; }
.badge-card.locked { filter: grayscale(1); opacity: .48; }
.badge-icon { width: 60px; height: 60px; display: grid; place-items: center; margin: 0 auto 11px; border-radius: 21px; background: var(--gold-soft); font-size: 31px; }
.badge-card h3 { margin-bottom: 4px; }
.badge-card p { margin-bottom: 0; color: var(--muted); font-size: .78rem; }

.lab-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
.lab-card { padding: 20px; }
.lab-card .lab-icon { width: 54px; height: 54px; display: grid; place-items: center; margin-bottom: 14px; border-radius: 18px; background: var(--sky-soft); font-size: 29px; }
.lab-card p { color: var(--muted); font-size: .84rem; }
.lab-panel { padding: clamp(20px,4vw,34px); }
.lab-stage { min-height: 250px; display: grid; place-items: center; margin: 20px 0; padding: 24px; border: 2px dashed #d9dce8; border-radius: var(--radius); background: #fbfcff; }
.lab-controls { display: flex; justify-content: center; align-items: end; gap: 12px; flex-wrap: wrap; }
.control-group { min-width: 190px; }
.control-group label { display: flex; justify-content: space-between; margin-bottom: 7px; font-size: .8rem; font-weight: 900; }
.control-group input[type="range"] { width: 100%; accent-color: var(--purple); }
.circuit { display: flex; align-items: center; gap: 0; }
.wire { width: 75px; height: 7px; background: #697386; }
.battery { width: 50px; height: 80px; display: grid; place-items: center; border: 5px solid #394155; border-radius: 11px; background: #ffd166; font-weight: 900; }
.bulb { width: 78px; height: 78px; display: grid; place-items: center; border-radius: 50%; border: 5px solid #aeb5c4; background: #e6e8ee; font-size: 40px; transition: .25s ease; }
.bulb.on { border-color: #f1be33; background: #fff5b8; box-shadow: 0 0 45px #ffd95f; }
.density-tank { position: relative; width: min(100%,430px); height: 190px; overflow: hidden; border: 5px solid #8cc9e8; border-top: 0; border-radius: 0 0 23px 23px; background: linear-gradient(#dff5ff 15%,#9edcf5); }
.density-object { position: absolute; left: 50%; transform: translateX(-50%); font-size: 45px; transition: top .65s cubic-bezier(.3,.8,.4,1); }
.shadow-scene { position: relative; width: min(100%,500px); height: 150px; border-bottom: 4px solid #888ca0; }
.shadow-sun { position: absolute; left: 5px; top: 25px; font-size: 50px; }
.shadow-object { position: absolute; left: 48%; bottom: 0; font-size: 60px; }
.shadow-mark { position: absolute; left: 57%; bottom: -2px; height: 17px; width: var(--shadow-size,120px); border-radius: 50%; background: rgba(45,48,65,.35); transform: skewX(-27deg); transform-origin: left; transition: width .2s; }
.heat-tube { width: 80px; height: 220px; position: relative; border: 5px solid #99a0b2; border-radius: 35px 35px 15px 15px; background: white; }
.heat-liquid { position: absolute; left: 12px; right: 12px; bottom: 12px; height: var(--heat,40%); border-radius: 18px 18px 7px 7px; background: linear-gradient(#ff947e,#eb4d5c); transition: height .25s; }
.speed-readout { text-align: center; }
.speed-readout strong { display: block; color: var(--purple); font-size: clamp(2.5rem,7vw,5rem); line-height: 1; }
.speed-readout span { color: var(--muted); font-weight: 800; }

.mission-layout { display: grid; grid-template-columns: minmax(0,1.45fr) minmax(250px,.75fr); gap: 20px; align-items: stretch; }
.mission-setup-card, .mission-benefits { padding: clamp(22px,4vw,32px); }
.mission-setup-card h2, .mission-benefits h2 { margin-top: 0; }
.mission-setup-card select { width: 100%; min-height: 48px; padding: 10px 12px; color: var(--ink); background: white; border: 1.5px solid var(--line); border-radius: 14px; }
.mission-best { display: grid; align-content: center; padding: 9px 14px; color: var(--purple-dark); background: var(--purple-soft); border-radius: 14px; }
.mission-best span { font-size: .72rem; font-weight: 850; }
.mission-best strong { font-size: 1.35rem; }
.mission-start-button { width: 100%; margin-top: 20px; }
.mission-area { margin-top: 22px; }
.mission-welcome { padding: 38px; text-align: center; }
.mission-welcome > span { font-size: 52px; }
.mission-welcome h2 { margin: 10px 0 5px; }
.mission-game-card { max-width: 900px; margin: 0 auto; padding: clamp(22px,4vw,38px); }
.mission-hud { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: .82rem; font-weight: 850; }
.mission-hud strong { color: var(--ink); }
.mission-progress { margin: 13px 0 22px; }
.mission-topic { display: inline-flex; gap: 7px; align-items: center; margin-bottom: 11px; padding: 5px 9px; color: var(--purple-dark); background: var(--purple-soft); border-radius: 999px; font-size: .72rem; font-weight: 900; }
.mission-game-card > h2 { margin: 0 0 20px; font-size: clamp(1.35rem,3vw,2rem); line-height: 1.3; }
.mission-options { display: grid; gap: 10px; }
.mission-feedback { margin-top: 18px; padding: 17px; border-radius: 15px; }
.mission-feedback.correct { color: #12684e; background: var(--green-soft); border: 1px solid #9cdfc8; }
.mission-feedback.wrong { color: #8c3344; background: var(--red-soft); border: 1px solid #ffc0cb; }
.mission-feedback p { margin: 6px 0 13px; line-height: 1.55; }
.memory-game-card { max-width: 1100px; }
.memory-instruction { margin: 0 0 18px; color: var(--muted); text-align: center; font-weight: 800; }
.memory-board { display: grid; grid-template-columns: repeat(auto-fit,minmax(165px,1fr)); gap: 12px; }
.memory-card { min-width: 0; height: 178px; padding: 0; perspective: 900px; color: var(--ink); background: transparent; border: 0; cursor: pointer; }
.memory-card-inner { position: relative; display: block; width: 100%; height: 100%; transform-style: preserve-3d; transition: transform .42s cubic-bezier(.2,.75,.3,1); }
.memory-card.flipped .memory-card-inner { transform: rotateY(180deg); }
.memory-card-back, .memory-card-front { position: absolute; inset: 0; display: grid; place-items: center; padding: 14px; overflow: hidden; border-radius: 17px; backface-visibility: hidden; box-shadow: 0 7px 18px rgba(44,50,88,.12); }
.memory-card-back { color: white; background: linear-gradient(145deg,var(--purple),#8373f1); border: 3px solid rgba(255,255,255,.32); font-size: 2.6rem; }
.memory-card-back::after { content: '?'; position: absolute; right: 13px; bottom: 7px; color: rgba(255,255,255,.55); font-size: 1.05rem; font-weight: 950; }
.memory-card-front { align-content: center; gap: 8px; overflow-y: auto; transform: rotateY(180deg); background: white; border: 2px solid #c9c4f8; font-size: .8rem; font-weight: 800; line-height: 1.4; text-align: center; }
.memory-card-front small { padding: 3px 7px; color: var(--purple-dark); background: var(--purple-soft); border-radius: 999px; font-size: .58rem; font-weight: 950; text-transform: uppercase; }
.memory-card.matched .memory-card-front { background: var(--green-soft); border-color: var(--green); box-shadow: 0 7px 20px rgba(20,184,166,.18); }
.memory-card.matched .memory-card-front::after { content: '✓'; position: absolute; top: 8px; right: 10px; color: var(--green); font-size: 1.1rem; font-weight: 950; }
.memory-card:focus-visible { outline: 4px solid rgba(91,75,219,.28); outline-offset: 3px; border-radius: 17px; }
.memory-card:disabled { cursor: default; opacity: 1; }
.mission-result { display: grid; grid-template-columns: auto 1fr auto; gap: 20px; align-items: center; padding: clamp(24px,4vw,36px); }
.mission-result-score { display: grid; place-items: center; width: 108px; aspect-ratio: 1; background: var(--yellow-soft); border-radius: 50%; }
.mission-result-score span { font-size: 34px; line-height: 1; }
.mission-result-score strong { font-size: 1.35rem; }
.mission-result-actions { display: flex; gap: 9px; flex-wrap: wrap; justify-content: flex-end; }
.mission-performance { max-width: 900px; margin: 18px auto 0; padding: clamp(22px,4vw,32px); }
.mission-performance h2 { margin-top: 0; }
.mission-performance-row { display: grid; grid-template-columns: minmax(150px,1fr) minmax(120px,1.25fr) 45px; gap: 13px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); }
.mission-performance-row:last-child { border: 0; }
.mission-performance-row > span { font-weight: 800; }
.mission-performance-row > strong { text-align: right; }
.memory-summary { color: var(--muted); font-size: .78rem; font-weight: 800; }

.form-card { padding: clamp(22px,4vw,34px); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field label { display: block; margin-bottom: 7px; font-size: .83rem; font-weight: 900; }
.field input, .field select { width: 100%; min-height: 48px; padding: 10px 12px; color: var(--ink); background: white; border: 1.5px solid var(--line); border-radius: 14px; }
.form-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.info-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.info-list li { display: flex; gap: 11px; align-items: flex-start; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.info-list li:last-child { border: 0; padding-bottom: 0; }
.curriculum-box { padding: 21px; margin-top: 18px; background: var(--sky-soft); }
.curriculum-box p { color: #365b75; font-size: .86rem; }
.source-list { margin: 13px 0 0; padding-left: 20px; }
.source-list a { color: var(--purple-dark); font-weight: 800; }

.year-paper-button { width: 100%; margin-top: 14px; background: rgba(255,255,255,.78); }
.worksheet-layout { display: grid; grid-template-columns: minmax(250px,310px) minmax(0,1fr); gap: 22px; align-items: start; }
.worksheet-controls { position: sticky; top: 92px; padding: 22px; }
.worksheet-controls .field + .field { margin-top: 15px; }
.worksheet-controls select { width: 100%; min-height: 46px; padding: 9px 12px; color: var(--ink); background: white; border: 1.5px solid var(--line); border-radius: 13px; }
.check-field { display: flex; gap: 10px; align-items: center; margin-top: 18px; font-weight: 900; cursor: pointer; }
.check-field input { width: 19px; height: 19px; accent-color: var(--purple); }
.generator-note { margin-top: 18px; padding: 14px; color: #365b75; background: var(--sky-soft); border-radius: 14px; }
.generator-note strong { color: var(--ink); font-size: .85rem; }
.generator-note p, .small-note { margin: 6px 0 0; font-size: .78rem; line-height: 1.55; }
.worksheet-actions .btn { flex: 1 1 100%; }
.worksheet-preview { min-width: 0; }
.worksheet-document { width: min(100%,850px); margin: 0 auto; padding: clamp(25px,4vw,48px); color: #17213a; background: white; border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow-md); }
.worksheet-paper-header { display: flex; gap: 22px; justify-content: space-between; align-items: start; padding-bottom: 18px; border-bottom: 3px solid #2b3150; }
.worksheet-paper-header h1 { max-width: 650px; margin: 6px 0; font-size: clamp(1.45rem,3vw,2rem); }
.worksheet-paper-header p { margin: 0; color: #56617a; font-weight: 700; }
.worksheet-logo { color: var(--purple-dark); font-size: .78rem; font-weight: 950; letter-spacing: .04em; }
.paper-code { flex: 0 0 auto; padding: 10px 12px; text-align: right; background: #f5f6fb; border-radius: 10px; }
.paper-code span { display: block; color: #65708a; font-size: .65rem; font-weight: 800; text-transform: uppercase; }
.paper-code strong { font-size: .82rem; }
.student-fields { display: grid; grid-template-columns: 1.6fr .8fr .8fr; gap: 18px; padding: 18px 0 13px; font-weight: 800; }
.worksheet-meta { display: flex; gap: 16px; flex-wrap: wrap; padding: 10px 13px; background: #f5f6fb; border-radius: 10px; font-size: .78rem; font-weight: 850; }
.jsu-summary { margin: 19px 0 23px; padding: 16px; background: #f5f3ff; border: 1px solid #ded9ff; border-radius: 13px; }
.jsu-summary h2 { margin: 0 0 11px; color: var(--purple-dark); font-size: .92rem; }
.jsu-metrics { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; }
.jsu-metrics span { display: grid; gap: 2px; padding: 9px; background: white; border-radius: 9px; font-size: .66rem; line-height: 1.3; }
.jsu-metrics strong { font-size: .95rem; }
.coverage-strip { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.coverage-strip span { padding: 4px 7px; color: #4f4a78; background: white; border-radius: 999px; font-size: .62rem; }
.worksheet-section { margin-top: 30px; }
.worksheet-section > h2 { display: flex; justify-content: space-between; gap: 12px; margin: 0; padding-bottom: 8px; border-bottom: 2px solid #2b3150; font-size: 1.08rem; }
.worksheet-section > h2 small { font-size: .72rem; }
.paper-instruction { margin: 9px 0 18px; color: #56617a; font-size: .78rem; font-style: italic; }
.print-question { padding: 15px 0; break-inside: avoid; border-bottom: 1px solid #e4e7f0; }
.print-question:last-child { border-bottom: 0; }
.print-question-text { display: grid; grid-template-columns: 28px 1fr; gap: 4px; }
.print-question p { margin: 4px 0 8px; line-height: 1.55; }
.print-topic-tag { display: inline-block; padding: 2px 7px; color: #504799; background: #efedff; border-radius: 999px; font-size: .6rem; font-weight: 850; }
.print-options { display: grid; grid-template-columns: 1fr 1fr; gap: 7px 24px; margin: 9px 0 0; padding-left: 25px; }
.print-options li { padding-left: 3px; line-height: 1.4; }
.question-marks { float: right; white-space: nowrap; font-size: .72rem; }
.answer-lines { display: grid; gap: 13px; margin: 12px 0 3px; }
.answer-lines span { min-height: 8px; border-bottom: 1px solid #7a8294; }
.grouped-question > h3, .structured-question > h3 { display: flex; justify-content: space-between; gap: 12px; margin: 0 0 10px; font-size: .94rem; }
.question-part { padding: 7px 0; }
.worksheet-answer-key { margin-top: 40px; padding-top: 25px; break-before: page; border-top: 3px solid #2b3150; }
.worksheet-answer-key h2 { margin-top: 0; }
.worksheet-answer-key li { margin-bottom: 9px; line-height: 1.45; }
.scheme-question { display: grid; grid-template-columns: 34px 1fr; gap: 4px; margin: 10px 0; }
.scheme-question h4 { margin: 0; }
.scheme-question ol { margin: 0; }
.answers-hidden .worksheet-answer-key { display: none; }

.empty-state { padding: 38px; text-align: center; }
.empty-state .big-emoji { font-size: 50px; }
.toast { position: fixed; z-index: 100; left: 50%; bottom: 28px; max-width: min(90vw,480px); transform: translateX(-50%); padding: 13px 18px; color: white; background: #2b3150; border-radius: 14px; box-shadow: var(--shadow-md); font-weight: 800; animation: toast-in .22s ease both; }
@keyframes toast-in { from { opacity: 0; transform: translate(-50%,10px); } }
.celebration { position: fixed; z-index: 90; inset: 0; pointer-events: none; overflow: hidden; }
.confetti { position: absolute; top: -20px; width: 11px; height: 18px; border-radius: 3px; animation: fall 1.5s ease-in forwards; }
@keyframes fall { to { transform: translate(var(--drift), 105vh) rotate(680deg); opacity: .1; } }

@media (max-width: 1040px) {
  .topic-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .year-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .stats-grid, .badge-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .lab-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 780px) {
  body { padding-bottom: 76px; }
  .topbar { height: 65px; padding: 0 14px; }
  .brand-mark { width: 40px; height: 40px; border-radius: 13px; font-size: 22px; }
  .brand strong { font-size: 1rem; }
  .brand small { display: none; }
  .points-label, .install-button span:last-child { display: none; }
  .language-control select { max-width: 118px; padding: 8px 27px 8px 9px; font-size: .78rem; }
  .points-chip { min-height: 39px; padding: 7px 10px; }
  .side-nav { display: none; }
  .main-content { margin-left: 0; min-height: calc(100vh - 65px); padding: 22px 15px 35px; }
  .bottom-nav { position: fixed; z-index: 40; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: repeat(5,1fr); padding: 7px max(7px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(7px,env(safe-area-inset-left)); border-top: 1px solid var(--line); background: rgba(255,255,255,.95); backdrop-filter: blur(14px); }
  .bottom-nav a { min-width: 0; display: grid; place-items: center; gap: 1px; padding: 4px 2px; color: var(--muted); text-decoration: none; border-radius: 10px; }
  .bottom-nav a span { font-size: 1.22rem; line-height: 1.1; }
  .bottom-nav a small { max-width: 100%; overflow: hidden; text-overflow: ellipsis; font-size: .64rem; font-weight: 900; }
  .bottom-nav a.active { color: var(--purple); background: var(--purple-soft); }
  .hero { min-height: 0; grid-template-columns: 1fr; padding: 28px 24px; }
  .hero-art { display: none; }
  .year-grid, .topic-grid, .lab-grid { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; }
  .continue-card { grid-template-columns: auto 1fr; }
  .continue-card .btn { grid-column: 1 / -1; }
  .page-header .header-icon { width: 59px; height: 59px; border-radius: 19px; font-size: 31px; }
  .year-banner { grid-template-columns: 1fr; padding: 23px; }
  .year-banner .progress-box { min-width: 0; }
  .topic-hero { grid-template-columns: auto 1fr; padding: 19px; gap: 14px; }
  .topic-hero .topic-big-icon { width: 64px; height: 64px; border-radius: 21px; font-size: 35px; }
  .topic-hero .topic-stars { grid-column: 1 / -1; justify-self: start; }
  .fact-grid { grid-template-columns: 1fr; }
  .application-grid { grid-template-columns: 1fr; }
  .comparison-grid { grid-template-columns: 1fr; }
  .notes-overview-grid { grid-template-columns: 1fr; }
  .mastery-panel { grid-template-columns: 1fr; }
  .quiz-layout { grid-template-columns: 1fr; }
  .question-nav-panel { position: static; }
  .question-map { grid-template-columns: repeat(10,1fr); }
  .result-summary { grid-template-columns: 1fr; text-align: center; }
  .result-summary .result-ring { margin: 0 auto; }
  .result-summary .result-actions { justify-content: center; }
  .match-grid { grid-template-columns: 1fr; }
  .match-column:first-child { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .match-card.term { text-align: center; }
  .progress-hero { grid-template-columns: 1fr; text-align: center; }
  .level-orb { margin: 0 auto; }
  .year-progress-row { grid-template-columns: 85px 1fr 38px; gap: 9px; }
  .form-grid { grid-template-columns: 1fr; }
  .mission-layout { grid-template-columns: 1fr; }
  .mission-result { grid-template-columns: 1fr; text-align: center; }
  .mission-result-score { margin: 0 auto; }
  .mission-result-actions { justify-content: center; }
  .worksheet-layout { grid-template-columns: 1fr; }
  .worksheet-controls { position: static; }
  .student-fields { grid-template-columns: 1fr; gap: 10px; }
  .jsu-metrics { grid-template-columns: 1fr; }
  .toast { bottom: 92px; }
}

@media (max-width: 470px) {
  h1 { font-size: 1.85rem; }
  .hero h1 { font-size: 2rem; }
  .hero-actions .btn { width: 100%; }
  .stats-grid, .badge-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-card, .badge-card { padding: 15px 12px; }
  .topic-tabs { margin-left: -4px; margin-right: -4px; }
  .topic-tabs a { font-size: .78rem; padding: 8px 10px; }
  .intro-card { display: block; }
  .intro-card .bubble { margin-bottom: 12px; }
  .mastery-list { grid-template-columns: 1fr; }
  .question-map { grid-template-columns: repeat(5,1fr); }
  .revision-intro { align-items: flex-start; }
  .answer-count { min-width: 86px; }
  .quiz-navigation .btn { flex: 1 1 auto; }
  .quiz-navigation #submitQuiz { flex-basis: 100%; margin-left: 0; }
  .incomplete-banner { align-items: flex-start; }
  .incomplete-banner .btn { width: 100%; }
  .incomplete-banner .btn + .btn { margin: 7px 0 0; }
  .match-column:first-child { grid-template-columns: 1fr; }
  .tf-actions { grid-template-columns: 1fr; }
  .result-card { padding: 25px 18px; }
  .mission-hud { gap: 7px; }
  .memory-board { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 9px; }
  .memory-card { height: 165px; }
  .memory-card-front { padding: 10px 8px; font-size: .7rem; }
  .mission-performance-row { grid-template-columns: 1fr 70px; }
  .mission-performance-row .progress-track { grid-column: 1 / -1; grid-row: 2; }
  .section-head { align-items: start; flex-direction: column; gap: 3px; }
  .top-actions { gap: 6px; }
  .install-button { display: none !important; }
}

@media print {
  body { background: white; padding: 0; }
  .topbar, .side-nav, .bottom-nav, .btn, .topic-tabs, .worksheet-controls, .worksheet-page-header { display: none !important; }
  .main-content { margin: 0; padding: 0; }
  .card { box-shadow: none; break-inside: avoid; }
  .page { max-width: none; padding: 0; }
  .worksheet-layout { display: block; }
  .worksheet-document { width: auto; margin: 0; padding: 0; border: 0; border-radius: 0; box-shadow: none; }
  .worksheet-document .jsu-summary { background: white; }
  .worksheet-answer-key { break-before: page; }
  @page { size: A4; margin: 13mm; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
.app-version { display: inline-block; padding: 2px 5px; border-radius: 7px; color: var(--purple); background: var(--purple-soft); font-size: .56rem; line-height: 1; vertical-align: super; }