/* LearnDen design system — "a warm den after dark" */
@font-face { font-family: 'Fraunces'; src: url('fonts/fraunces-latin.woff2') format('woff2');
  font-weight: 400 900; font-display: swap; }
@font-face { font-family: 'Outfit'; src: url('fonts/outfit-latin.woff2') format('woff2');
  font-weight: 300 800; font-display: swap; }

:root {
  --bg: #12151c; --bg2: #191e27; --card: #212936; --card2: #283345;
  --ink: #edeef2; --ink-soft: #a5aec0; --line: #354156;
  --ks1: #ff9d5c; --ks2: #3fd0bf; --ks3: #8ba3ff; --ks4: #c497f4;
  --accent: var(--ks2);
  --good: #6fd388; --warn: #ffb35c;
  --subject-maths: #5aa0ff; --subject-english: #ff7088; --subject-science: #4dd889;
  --tone-planner: #35d3c8; --tone-arcade: #fbbf24; --tone-teach: #8b8cff;
  --glow: 0 0 44px;
  --radius: 18px;
  --spring: cubic-bezier(.34, 1.4, .44, 1);
  --shadow: 0 10px 34px rgba(0,0,0,.35);
}
:root[data-theme="light"] {
  --bg: #f4f1ea; --bg2: #ece8df; --card: #fffdf8; --card2: #f7f4ec;
  --ink: #232832; --ink-soft: #6b7280; --line: #e0dbd0;
  --ks1: #d96f22; --ks2: #0d9488; --ks3: #4f6ae5; --ks4: #8b5cc9;
  --good: #2e9e52; --warn: #d97c1a;
  --subject-maths: #2563eb; --subject-english: #c93855; --subject-science: #147c4f;
  --tone-planner: #0f766e; --tone-arcade: #b7791f; --tone-teach: #4f46e5;
  --shadow: 0 10px 30px rgba(60,50,30,.12);
}
.ks1 { --accent: var(--ks1); } .ks2 { --accent: var(--ks2); }
.ks3 { --accent: var(--ks3); } .ks4 { --accent: var(--ks4); }

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { height: 100%; }
body { margin: 0; min-height: 100%; background: var(--bg); color: var(--ink);
  font-family: 'Outfit', system-ui, sans-serif; font-size: 17px; line-height: 1.55;
  overflow-x: hidden; }
body.easy-read { font-size: 20px; line-height: 1.8; letter-spacing: .01em; }

#bg-canvas { position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .55; }
#app { position: relative; z-index: 1; max-width: 780px; margin: 0 auto;
  padding: 1.2rem 1rem 6rem; }

h1, h2, h3 { font-family: 'Fraunces', Georgia, serif; line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(1.8rem, 6vw, 2.6rem); font-weight: 700; }
h2 { font-size: 1.35rem; font-weight: 700; }
h3 { font-size: 1.08rem; font-weight: 600; }
a { color: var(--accent); }
.title-icon { display: flex; align-items: center; gap: .5rem; min-width: 0; }
.title-icon img { border-radius: 9px; flex: 0 0 auto; }
.tone-maths { --tone: var(--subject-maths); }
.tone-english { --tone: var(--subject-english); }
.tone-science { --tone: var(--subject-science); }
.tone-planner { --tone: var(--tone-planner); }
.tone-arcade { --tone: var(--tone-arcade); }
.tone-teach { --tone: var(--tone-teach); }
.tone-title { color: var(--tone); }
.tone-title .brand-icon { filter: drop-shadow(0 0 10px color-mix(in srgb, var(--tone) 34%, transparent)); }
.brand-icon { width: 1.2em; height: 1.2em; border-radius: .32em; object-fit: contain;
  flex: 0 0 auto; filter: drop-shadow(0 0 10px color-mix(in srgb, var(--accent) 26%, transparent)); }
h1 .brand-icon { width: 1.05em; height: 1.05em; border-radius: .24em; }
h2 .brand-icon { width: 1.12em; height: 1.12em; }
h3 .brand-icon { width: 1.15em; height: 1.15em; }
.soft { color: var(--ink-soft); }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: .7rem;
  font-weight: 700; color: var(--accent); }

/* top bar */
.topbar { display: flex; align-items: center; justify-content: space-between; gap: .6rem;
  padding: .3rem 0 1.1rem; }
.brand { font-family: 'Fraunces', serif; font-weight: 700; font-size: 1.25rem;
  color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: .45rem; }
.brand .lamp-logo { width: 30px; height: 30px; border-radius: 8px;
  filter: drop-shadow(0 0 10px rgba(255,157,92,.4)); }
.topbar .actions { display: flex; gap: .45rem; }
.iconbtn { font: inherit; font-size: 1.05rem; width: 42px; height: 42px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer;
  display: grid; place-items: center; transition: transform .25s var(--spring), background .2s; }
.iconbtn:active { transform: scale(.92); }
.ui-icon { width: 22px; height: 22px; display: block; fill: none; stroke: currentColor;
  stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.icon-img { width: 26px; height: 26px; display: block; border-radius: 8px; object-fit: contain; }

/* fluid interactive cards */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.05rem 1.15rem; box-shadow: var(--shadow);
  transition: transform .35s var(--spring), border-color .25s, box-shadow .35s; }
a.card { display: block; color: var(--ink); text-decoration: none; }
.card.tap { cursor: pointer; }
@media (hover: hover) {
  .card.tap:hover { transform: translateY(-3px) scale(1.008); border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); }
}
.card.tap:active { transform: scale(.977); }
.grid { display: grid; gap: .8rem; margin-top: 1rem; }
.grid.cols2 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

/* the breathing search */
.search-wrap { position: relative; margin: 1.1rem 0 .4rem; }
.search { width: 100%; font: inherit; font-size: 1.12rem; color: var(--ink);
  background: var(--card); border: 2px solid var(--line); border-radius: 20px;
  padding: 1.05rem 1.2rem 1.05rem 3rem; outline: none;
  transition: border-color .3s, box-shadow .5s; }
.search::placeholder { color: var(--ink-soft); }
.search:focus { border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent); }
.search-wrap::before { content: '🔍'; position: absolute; left: 1.05rem; top: 50%;
  transform: translateY(-50%); font-size: 1.05rem; opacity: .75; }
@keyframes breathe { 0%,100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 24%, transparent); }
  50% { box-shadow: 0 0 0 9px transparent; } }
.search.breathe:not(:focus) { animation: breathe 3.6s ease-in-out infinite; }

/* chips, pills, ribbons */
.chip { display: inline-flex; align-items: center; gap: .35rem; font-size: .82rem; font-weight: 600;
  border: 1px solid var(--line); background: var(--card2); color: var(--ink);
  border-radius: 99px; padding: .32rem .8rem; }
.now-ribbon { display: inline-flex; align-items: center; gap: .4rem; font-size: .74rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .09em; color: #171207;
  background: linear-gradient(100deg, #ffd98c, #ffb35c); border-radius: 7px; padding: .18rem .55rem; }
.pill-year { font-weight: 800; font-size: .74rem; letter-spacing: .05em; border-radius: 7px;
  padding: .16rem .55rem; color: var(--bg); background: var(--accent); }

/* subtopic rows */
.sub-row { display: flex; align-items: center; justify-content: space-between; gap: .7rem; }
.sub-row .name { font-weight: 600; }
.sub-row .meta { font-size: .78rem; color: var(--ink-soft); }
.subject-page .backlink { margin-bottom: .35rem; }
.subject-page .eyebrow { margin: .2rem 0 .25rem; }
.subject-page > h1 { margin-bottom: .1rem; }
.subject-page .section-label { margin-top: 1.1rem; }
.topic-row { margin-top: .42rem; padding: .72rem .9rem; }
.topic-row .sub-row > span:first-child { min-width: 0; }
.topic-meta-line { display: flex; align-items: center; flex-wrap: wrap; gap: .28rem .5rem; margin-top: .12rem; }
.topic-sources { display: inline-flex; align-items: center; flex-wrap: wrap; gap: .25rem; }
.topic-source { display: inline-flex; align-items: center; min-height: 20px; padding: .08rem .38rem;
  border: 1px solid var(--line); border-radius: 6px; font-size: .64rem; line-height: 1; font-weight: 800; }
.topic-source.source-oak { color: #7fd6a4; border-color: #4caf7a66; background: #4caf7a18; }
.topic-source.source-bbc { color: #97a8ff; border-color: #4f6ae566; background: #4f6ae514; }
.topic-source.source-teach { color: #56d0c2; border-color: #0d948866; background: #0d948814; }
:root[data-theme="light"] .topic-source.source-oak { color: #1d7a4b; }
:root[data-theme="light"] .topic-source.source-bbc { color: #3a52c4; }
:root[data-theme="light"] .topic-source.source-teach { color: #0b6f66; }
.topic-row-end { display: flex; align-items: center; gap: .35rem; flex: 0 0 auto; }
.topic-chevron { width: 32px; height: 32px; display: grid; place-items: center;
  color: var(--ink-soft); font-size: 1.45rem; line-height: 1; border-radius: 9px; }
@media (hover: hover) { .topic-row:hover .topic-chevron { color: var(--accent); background: var(--card2); } }
.tick { width: 34px; height: 34px; min-width: 34px; border-radius: 50%; border: 2px solid var(--line);
  background: transparent; color: transparent; font-size: 1rem; cursor: pointer; display: grid;
  place-items: center; transition: all .3s var(--spring); position: relative; }
.tick.on { background: var(--good); border-color: var(--good); color: #0e2413; }
.tick .rip { position: absolute; inset: -2px; border-radius: 50%; pointer-events: none; }
@keyframes ripple { from { box-shadow: 0 0 0 0 color-mix(in srgb, var(--good) 55%, transparent); }
  to { box-shadow: 0 0 0 26px transparent; } }
.tick.on .rip.go { animation: ripple .7s ease-out; }

/* resource buttons */
.res { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: .9rem; }
.res a, .res button { display: inline-flex; align-items: center; gap: .45rem; font: inherit;
  font-size: .92rem; font-weight: 700; text-decoration: none; cursor: pointer;
  border-radius: 13px; padding: .68rem 1rem; min-height: 46px; border: none;
  transition: transform .3s var(--spring), filter .2s; }
.res a:active, .res button:active { transform: scale(.94); }
.res .watch { background: #e2574c22; color: #ff8d80; border: 1.5px solid #e2574c66; }
.res .oak   { background: #4caf7a22; color: #7fd6a4; border: 1.5px solid #4caf7a66; }
.res .bites { background: #4f6ae522; color: #97a8ff; border: 1.5px solid #4f6ae566; }
.res .les   { background: #0d948822; color: #56d0c2; border: 1.5px solid #0d948866; }
.res .cbt   { background: #b7791f22; color: #ffc46b; border: 1.5px solid #b7791f66; }
:root[data-theme="light"] .res .watch { color: #b3362b; }
:root[data-theme="light"] .res .oak   { color: #1d7a4b; }
:root[data-theme="light"] .res .bites { color: #3a52c4; }
:root[data-theme="light"] .res .les   { color: #0b6f66; }
:root[data-theme="light"] .res .cbt   { color: #8f5c12; }

.prereq { margin-top: .8rem; font-size: .9rem; padding: .7rem .9rem; border-radius: 12px;
  background: color-mix(in srgb, var(--warn) 12%, transparent);
  border-left: 3px solid var(--warn); }
.prereq a { color: var(--warn); font-weight: 700; }

/* activity list — name links to video, icon chips jump per medium */
.acts { margin: .6rem 0 0; padding: 0; list-style: none; }
.acts li { display: flex; align-items: center; justify-content: space-between; gap: .5rem .7rem;
  flex-wrap: wrap; padding: .5rem .2rem; border-bottom: 1px solid var(--line); font-size: .95rem; }
.acts li:last-child { border-bottom: none; }
.acts .act-main { flex: 1 1 15rem; color: var(--ink); text-decoration: none; font-weight: 500;
  padding: .2rem 0; border-radius: 8px; }
@media (hover: hover) { .acts .act-main:hover { color: var(--accent); } }
.act-links { display: flex; gap: .4rem; }
.act-links a, .act-links button { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 11px;
  text-decoration: none; font-size: 1.02rem; background: var(--card2); border: 1px solid var(--line);
  transition: transform .25s var(--spring), border-color .2s; }
.act-links a:active, .act-links button:active { transform: scale(.9); }
.act-links button { font: inherit; cursor: pointer; color: var(--ink); }
.act-links .act-done { width: auto; min-width: 58px; padding: 0 .62rem; font-size: .78rem; font-weight: 800;
  border-color: color-mix(in srgb, var(--accent) 30%, var(--line)); }
.act-links .act-done.done { color: #0e2413; background: var(--good); border-color: var(--good); }
/* one colour per source so the chips read at a glance */
.act-links a.src-oak  { border-color: #4caf7a88; background: #4caf7a1a; }  /* Oak exact lesson */
.act-links a.src-bbc  { border-color: #4f6ae566; background: #4f6ae514; }  /* Bitesize */
.act-links a.src-khan { border-color: #b7791f55; background: #b7791f12; }  /* Khan */
.act-links a.src-cm   { border-color: #e2574c55; background: #e2574c12; }  /* Corbettmaths */
.act-links a.src-tw   { border-color: #0d948866; background: #0d948814; }  /* Twinkl */
.act-links a.hit { box-shadow: 0 0 0 1px currentColor inset; } /* direct topic match, not a search */
.act-links a.src-verified { border-color: #6fd38899; background: #6fd38820; } /* fleet-verified, opened + judged */
@media (hover: hover) { .act-links a.src-verified:hover { border-color: var(--good); } }
@media (hover: hover) { .act-links a:hover, .act-links button:hover { border-color: var(--accent); transform: translateY(-2px); } }

.activity-ticket-card, .arcade-ticketline, .arcade-lock {
  margin-top: .8rem; border: 1px solid var(--line); background: color-mix(in srgb, var(--card2) 78%, transparent);
  border-radius: 14px; padding: .75rem .85rem;
}
.activity-ticket-card { display: block; padding: .58rem .7rem; }
.ticket-rule-toggle { width: 100%; display: flex; align-items: center; justify-content: space-between;
  gap: .6rem; border: 0; padding: 0; margin: 0; background: transparent; color: inherit;
  font: inherit; text-align: left; cursor: pointer; }
.ticket-chevron { flex: 0 0 auto; color: var(--accent); font-weight: 900;
  transition: transform .25s var(--spring); }
.activity-ticket-card.open .ticket-rule-toggle { padding-bottom: .55rem; border-bottom: 1px solid var(--line); }
.activity-ticket-card.open .ticket-chevron { transform: rotate(180deg); }
.ticket-rule-copy { display: grid; gap: .02rem; min-width: 9.5rem; }
.ticket-rule-copy b { display: inline; line-height: 1.1; }
.ticket-rule-copy .soft { font-size: .78rem; line-height: 1.2; }
.ticket-rule-body { padding-top: .58rem; }
.ticket-rule-body p { margin: 0 0 .2rem; font-size: .86rem; }
.ticket-counter { display: flex; align-items: center; justify-content: flex-end; flex: 1 1 16rem;
  flex-wrap: wrap; gap: .45rem; font-size: .78rem; font-weight: 700; min-width: 0; }
.ticket-counter span { display: inline-flex; align-items: baseline; gap: .18rem; border: 1px solid var(--line);
  background: var(--card); border-radius: 99px; padding: .22rem .6rem; white-space: nowrap; line-height: 1.1; }
.ticket-counter b { display: inline !important; line-height: 1; }
.ticket-counter .ticket-note { color: var(--accent); }
.ticket-feedback { min-height: 1.15rem; font-size: .8rem; color: var(--good); font-weight: 700; }
@media (max-width: 520px) {
  .ticket-rule-toggle { align-items: flex-start; flex-wrap: wrap; }
  .ticket-counter { justify-content: flex-start; flex-basis: 100%; order: 2; }
  .ticket-chevron { margin-top: .15rem; }
}

/* term planner */
.term-grid { display: grid; gap: .85rem; margin-top: 1rem; }
.term-cell { --term: var(--accent); border-radius: 14px; border: 1px solid color-mix(in srgb, var(--term) 36%, var(--line));
  background: linear-gradient(90deg, color-mix(in srgb, var(--term) 11%, var(--card)), var(--card) 34%);
  padding: .9rem 1rem; box-shadow: inset 5px 0 0 color-mix(in srgb, var(--term) 74%, transparent); }
.term-cell.term-0 { --term: #c9852f; }
.term-cell.term-1 { --term: #b65f3a; }
.term-cell.term-2 { --term: #4f86d9; }
.term-cell.term-3 { --term: #6c9f45; }
.term-cell.term-4 { --term: #19a6a3; }
.term-cell.term-5 { --term: #d8a22e; }
.term-cell.now { border-color: color-mix(in srgb, var(--term) 72%, var(--line));
  background: linear-gradient(90deg, color-mix(in srgb, var(--term) 17%, var(--card)), var(--card) 38%); }
.term-cell h3 { display: flex; justify-content: space-between; align-items: baseline; gap: .6rem; }
.term-title, .subject-title { display: inline-flex; align-items: center; gap: .45rem; min-width: 0; }
.term-title { color: color-mix(in srgb, var(--term) 78%, var(--ink)); }
.term-season-icon { width: 1.18em; height: 1.18em; filter: drop-shadow(0 0 12px color-mix(in srgb, var(--term) 32%, transparent)); }
.term-cell h3 small { margin-left: .45rem; color: color-mix(in srgb, var(--term) 70%, var(--ink-soft)); font: inherit; font-size: .58em; font-weight: 800; }
.planner-reading { margin-top: .55rem; padding: .45rem .6rem; border-radius: 10px;
  background: color-mix(in srgb, var(--term) 10%, transparent); border: 1px solid color-mix(in srgb, var(--term) 18%, transparent); font-size: .9rem; }
.planner-subject { --subject: var(--accent); margin-top: .65rem; padding-top: .65rem;
  border-top: 1px solid color-mix(in srgb, var(--subject) 34%, var(--line)); }
.planner-subject.maths { --subject: var(--subject-maths); }
.planner-subject.english { --subject: var(--subject-english); }
.planner-subject.science { --subject: var(--subject-science); }
.planner-subject-head { display: flex; justify-content: space-between; gap: .7rem; align-items: baseline; }
.planner-subject-head b { color: var(--subject); }
.planner-subject-head .subject-icon { filter: drop-shadow(0 0 9px color-mix(in srgb, var(--subject) 34%, transparent)); }
.planner-subject-head span { color: var(--ink-soft); font-size: .78rem; text-align: right; }
.planner-topics { display: grid; grid-template-columns: repeat(auto-fit, minmax(185px, 1fr)); gap: .45rem; margin-top: .45rem; }
.planner-topic { display: grid; gap: .15rem; min-height: 54px; padding: .48rem .58rem; border-radius: 10px;
  border: 1px solid color-mix(in srgb, var(--subject) 28%, var(--line));
  background: color-mix(in srgb, var(--subject) 6%, var(--card2)); color: var(--ink); text-decoration: none; }
.planner-topic span { font-weight: 700; line-height: 1.2; }
.planner-topic em { color: var(--ink-soft); font-style: normal; font-size: .74rem; line-height: 1.2; }
.planner-start { margin: .42rem 0 0; color: color-mix(in srgb, var(--subject) 55%, var(--ink-soft)); font-size: .78rem; }
@media (hover: hover) {
  .planner-topic:hover { border-color: color-mix(in srgb, var(--subject) 58%, var(--line)); transform: translateY(-1px); }
}
@media (max-width: 560px) {
  .term-cell h3, .planner-subject-head { align-items: flex-start; flex-wrap: wrap; }
  .planner-subject-head span { text-align: left; }
}

/* settings sheet */
.sheet { position: fixed; inset: auto 0 0 0; z-index: 40; background: var(--card);
  border-radius: 22px 22px 0 0; border: 1px solid var(--line); border-bottom: none;
  padding: 1.1rem 1.2rem calc(1.5rem + env(safe-area-inset-bottom)); max-width: 560px; margin: 0 auto;
  box-shadow: 0 -18px 60px rgba(0,0,0,.45);
  transform: translateY(105%); transition: transform .45s var(--spring);
  opacity: 0; pointer-events: none;
  max-height: 88dvh; overflow-y: auto; overscroll-behavior: contain; }
.sheet.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.sheet-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  position: sticky; top: 0; background: var(--card); padding-bottom: .4rem; margin-bottom: .2rem; z-index: 1; }
.sheet-head h2 { margin: 0; }
/* desktop: a centred modal that always fits, never a giant bottom sheet */
@media (min-width: 640px) {
  .sheet { inset: 50% auto auto 50%; width: min(560px, 94vw); border-radius: 20px; border-bottom: 1px solid var(--line);
    padding-bottom: 1.5rem; max-height: 86vh; transform: translate(-50%, 60vh) scale(.98); }
  .sheet.open { transform: translate(-50%, -50%) scale(1); }
}
.sheet .row { display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .75rem 0; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.sheet .row[hidden] { display: none; }  /* [hidden] must beat the display:flex above */
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; flex-wrap: wrap; }
.seg button { font: inherit; font-size: .88rem; font-weight: 600; border: none; cursor: pointer;
  background: transparent; color: var(--ink-soft); padding: .5rem .85rem; }
.seg button.on { background: var(--accent); color: var(--bg); }
.overlay { position: fixed; inset: 0; z-index: 39; background: rgba(0,0,0,.45); opacity: 0;
  pointer-events: none; transition: opacity .3s; }
.overlay.show { opacity: 1; pointer-events: auto; }

/* arcade */
#game-wrap { position: relative; margin-top: 1rem; display: flex; justify-content: center; }
#game { width: 100%; aspect-ratio: 3 / 4; max-height: 74vh; border-radius: var(--radius);
  border: 1px solid var(--line); background: #0d1017; display: block; touch-action: none; cursor: pointer; }
@media (min-width: 700px) { #game { aspect-ratio: 16 / 10; max-height: 66vh; } }
.arcade-lock h1 { margin-top: .2rem; }
.score-table { width: 100%; border-collapse: collapse; margin-top: 1rem; font-variant-numeric: tabular-nums; }
.score-table td, .score-table th { padding: .45rem .6rem; border-bottom: 1px solid var(--line); text-align: left; }
.leaderboard-card, .score-submit { margin-top: 1rem; border: 1px solid var(--line); background: var(--card);
  border-radius: 14px; padding: .9rem 1rem; box-shadow: var(--shadow); }
.leaderboard-card .section-label { margin-top: 0; }
.leaderboard-table td:nth-child(3), .leaderboard-table th:nth-child(3),
.leaderboard-table td:nth-child(4), .leaderboard-table th:nth-child(4) { text-align: right; }
.score-submit { display: grid; gap: .8rem; }
.score-submit h3 { margin-top: .1rem; }
.score-fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .7rem; }
.score-fields label { display: grid; gap: .28rem; color: var(--ink-soft); font-size: .82rem; font-weight: 700; }
.score-fields input, .score-fields select { width: 100%; font: inherit; color: var(--ink); background: var(--card2);
  border: 1.5px solid var(--line); border-radius: 12px; padding: .65rem .75rem; outline: none; }
.score-fields input:focus, .score-fields select:focus { border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent); }
.score-save { justify-self: start; font: inherit; font-weight: 800; color: var(--bg); background: var(--accent);
  border: none; border-radius: 12px; padding: .65rem 1rem; cursor: pointer; }
.score-save:disabled { opacity: .65; cursor: wait; }
.score-msg { min-height: 1.2rem; color: var(--good); font-size: .84rem; font-weight: 700; }

.backlink { display: inline-flex; align-items: center; gap: .3rem; color: var(--ink-soft);
  text-decoration: none; font-size: .9rem; font-weight: 600; margin-bottom: .8rem; }
.section-label { margin: 1.6rem 0 .6rem; display: flex; align-items: center; gap: .6rem; }
.count-badge { font-size: .72rem; font-weight: 700; color: var(--ink-soft); }

footer { text-align: center; color: var(--ink-soft); font-size: .78rem; margin-top: 3rem; }

/* bottom navigation */
#bottomnav { position: fixed; bottom: 0; left: 0; right: 0; z-index: 30;
  display: flex; justify-content: space-around; align-items: center;
  background: color-mix(in srgb, var(--card) 74%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(1.35);
  backdrop-filter: blur(18px) saturate(1.35);
  border-top: 1px solid color-mix(in srgb, var(--accent) 14%, var(--line));
  box-shadow: 0 -18px 42px rgba(0,0,0,.26);
  padding: .38rem 0 calc(.38rem + env(safe-area-inset-bottom)); }
#bottomnav a { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .1rem;
  --nav-accent: var(--accent);
  font-size: .68rem; font-weight: 700; color: var(--ink-soft); text-decoration: none;
  padding: .34rem .9rem; border-radius: 14px; min-width: 64px; min-height: 54px; border: 1px solid transparent;
  position: relative; isolation: isolate; overflow: hidden;
  transition: transform .34s var(--spring), color .22s, background .22s, border-color .22s, box-shadow .34s; }
#bottomnav a[data-nav="home"] { --nav-accent: #16c784; }
#bottomnav a[data-nav="planner"] { --nav-accent: #35d3c8; }
#bottomnav a[data-nav="teach"] { --nav-accent: #7c8cff; }
#bottomnav a[data-nav="arcade"] { --nav-accent: #fbbf24; }
#bottomnav a::before, #bottomnav a::after { content: ""; position: absolute; pointer-events: none; opacity: 0; }
#bottomnav a::before { inset: 0; z-index: -2; border-radius: inherit;
  background:
    radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--nav-accent) 34%, transparent), transparent 52%),
    linear-gradient(135deg, color-mix(in srgb, white 14%, transparent), color-mix(in srgb, var(--nav-accent) 12%, transparent));
  -webkit-backdrop-filter: blur(18px) saturate(1.55);
  backdrop-filter: blur(18px) saturate(1.55);
  transition: opacity .28s ease; }
#bottomnav a::after { inset: -38% -64%; z-index: -1; border-radius: inherit;
  background: linear-gradient(105deg, transparent 34%, color-mix(in srgb, white 38%, transparent) 49%, transparent 64%);
  transform: translateX(-48%) rotate(8deg); }
#bottomnav a .ni { width: 22px; height: 22px; }
#bottomnav a .ni-img { border-radius: 6px; display: block; object-fit: contain; opacity: .72;
  filter: saturate(.8); transition: opacity .22s, filter .22s, transform .34s var(--spring), box-shadow .34s; }
#bottomnav a span { line-height: 1.05; }
#bottomnav a.on { color: var(--nav-accent);
  background: color-mix(in srgb, var(--card) 44%, transparent);
  border-color: color-mix(in srgb, var(--nav-accent) 58%, white 8%);
  transform: none;
  box-shadow:
    0 0 0 1px color-mix(in srgb, white 14%, transparent) inset,
    0 0 20px color-mix(in srgb, var(--nav-accent) 34%, transparent),
    0 13px 30px rgba(0,0,0,.23);
  animation: nav-neon-pulse 3.6s ease-in-out infinite; }
#bottomnav a.on::before { opacity: 1; }
#bottomnav a.on::after { opacity: .72; animation: nav-glass-sheen 4.8s ease-in-out infinite; }
#bottomnav a.on .ni { filter:
  drop-shadow(0 0 6px color-mix(in srgb, var(--nav-accent) 72%, transparent))
  drop-shadow(0 2px 9px color-mix(in srgb, var(--nav-accent) 44%, transparent)); }
#bottomnav a.on .ni-img { opacity: 1; filter:
  saturate(1.18)
  drop-shadow(0 0 6px color-mix(in srgb, var(--nav-accent) 72%, transparent))
  drop-shadow(0 2px 9px color-mix(in srgb, var(--nav-accent) 44%, transparent));
  box-shadow: 0 0 13px color-mix(in srgb, var(--nav-accent) 42%, transparent); }
#bottomnav a.nav-tap { transform: scale(.96);
  background: color-mix(in srgb, var(--nav-accent) 20%, transparent); }
#bottomnav a:active { transform: scale(.95); }
#bottomnav a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
@keyframes nav-neon-pulse {
  0%, 100% { box-shadow:
    0 0 0 1px color-mix(in srgb, white 13%, transparent) inset,
    0 0 17px color-mix(in srgb, var(--nav-accent) 28%, transparent),
    0 13px 30px rgba(0,0,0,.22); }
  50% { box-shadow:
    0 0 0 1px color-mix(in srgb, white 18%, transparent) inset,
    0 0 28px color-mix(in srgb, var(--nav-accent) 45%, transparent),
    0 16px 34px rgba(0,0,0,.25); }
}
@keyframes nav-glass-sheen {
  0%, 22% { transform: translateX(-52%) rotate(8deg); }
  46%, 100% { transform: translateX(52%) rotate(8deg); }
}

/* arcade layout — everything fits one screen */
.arcade-head { display: flex; align-items: center; gap: .8rem; margin-bottom: .5rem; flex-wrap: wrap; }


/* view transitions + reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  #bg-canvas { display: none; }
}
::view-transition-old(root) { animation: fadeout .18s ease both; }
::view-transition-new(root) { animation: fadein .28s ease both; }
@keyframes fadeout { to { opacity: 0; transform: translateY(-6px); } }
@keyframes fadein { from { opacity: 0; transform: translateY(10px); } }

@media (max-width: 480px) {
  #app { padding: .9rem .75rem 5rem; }
  .card { padding: .9rem .95rem; }
  .topic-row { padding: .68rem .78rem; }
  .topic-chevron { width: 30px; height: 30px; }
}