/* Brain Bridge: bright, friendly, built for a ten-year-old (and a parent). */

:root {
  --bg: #f3f6fb;
  --bg-2: #e8eef8;
  --panel: #ffffff;
  --line: #d9e1ee;
  --text: #1b2437;
  --muted: #5b6983;
  --blue: #1f4e9a;
  --blue-2: #2f80ed;
  --sky: #dbe9ff;
  --teal: #00a8a8;
  --coral: #eb5757;
  --sun: #f2c94c;
  --mint: #27ae60;
  --grape: #9b51e0;
  --orange: #f2994a;
  --pink: #e84393;
  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(27, 36, 55, 0.08);
  --font-display: 'Fredoka', 'Nunito', system-ui, sans-serif;
  --font-body: 'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f172a; --bg-2: #111c33; --panel: #182238; --line: #2a3752; --text: #e8eefc; --muted: #9fb0cc; --sky: #1e3a6a; color-scheme: dark;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; font-family: var(--font-body); font-size: 17px; line-height: 1.5; color: var(--text); background: var(--bg); }
img, svg { max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; border-radius: 6px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--sun); padding: 8px 12px; border-radius: 8px; z-index: 50; }
.skip:focus { left: 8px; }
a { color: var(--blue-2); }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; margin: 0 0 0.4em; letter-spacing: 0.01em; }
h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.7rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 0.8em; }

/* Header */
.site-header { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; padding: 12px 16px; background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-text { font-family: var(--font-display); font-weight: 700; font-size: 1.35rem; }
.brand-text span { color: var(--blue-2); }
.nav { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.nav a { text-decoration: none; color: var(--muted); font-weight: 700; padding: 8px 12px; border-radius: 999px; font-size: 0.95rem; }
.nav a:hover { background: var(--bg-2); color: var(--text); }
.nav a.active { background: var(--blue); color: #fff; }
.nav-parent { border: 1px dashed var(--line); }
.header-stats { display: flex; gap: 8px; align-items: center; font-weight: 800; font-size: 0.95rem; }
.header-stats .chip { background: var(--bg-2); border-radius: 999px; padding: 4px 10px; }
.app { width: min(1080px, 100%); margin: 0 auto; padding: 24px 16px 60px; }
@media (max-width: 640px) { .site-header { padding: 8px 12px; gap: 8px; } .nav { margin-left: 0; gap: 2px; } .nav a { padding: 6px 9px; font-size: 0.85rem; } .brand-text { font-size: 1.15rem; } .app { padding: 16px 12px 48px; } .card { padding: 16px; } }
.site-footer { padding: 24px 16px 40px; color: var(--muted); font-size: 0.85rem; text-align: center; max-width: 900px; margin: 0 auto; }

/* Layout bits */
.card { background: var(--panel); border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; margin-bottom: 20px; border: 1px solid var(--line); }
.card.tight { padding: 16px; }
.grid { display: grid; gap: 18px; }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.row.between { justify-content: space-between; }
.stack > * + * { margin-top: 12px; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.big { font-size: 1.25rem; }
.center { text-align: center; }
.pill { display: inline-block; padding: 3px 10px; border-radius: 999px; background: var(--bg-2); font-size: 0.85rem; font-weight: 800; }
.pill.bgs { background: #dbe9ff; color: #1f4e9a; }
.pill.qeh { background: #fde2ea; color: #8a1538; }
.pill.sun { background: #fff3c4; color: #7a5a00; }
.pill.mint { background: #d8f5e3; color: #1b6b3a; }
.pill.grape { background: #ecdcff; color: #5b2a9a; }
.pill.coral { background: #ffe0e0; color: #9a1f1f; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .pill.bgs, :root:not([data-theme="light"]) .pill.qeh, :root:not([data-theme="light"]) .pill.sun, :root:not([data-theme="light"]) .pill.mint, :root:not([data-theme="light"]) .pill.grape, :root:not([data-theme="light"]) .pill.coral { filter: saturate(0.9) brightness(0.85); } }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 20px; border-radius: 999px; border: 2px solid transparent; background: var(--blue-2); color: #fff; font-weight: 800; cursor: pointer; text-decoration: none; transition: transform 0.08s ease, box-shadow 0.15s ease, background 0.15s; box-shadow: 0 4px 0 rgba(0, 0, 0, 0.12); user-select: none; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(0, 0, 0, 0.12); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn.big { font-size: 1.3rem; padding: 16px 30px; }
.btn.secondary { background: var(--panel); color: var(--blue); border-color: var(--blue-2); }
.btn.ghost { background: transparent; color: var(--muted); box-shadow: none; border-color: var(--line); }
.btn.sun { background: var(--sun); color: #3a2c00; }
.btn.mint { background: var(--mint); }
.btn.coral { background: var(--coral); }
.btn.grape { background: var(--grape); }
.btn.teal { background: var(--teal); }
.btn.sm { padding: 8px 14px; font-size: 0.9rem; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 14px; }

/* Forms */
label.field { display: block; font-weight: 700; margin-bottom: 10px; }
label.field span { display: block; font-size: 0.9rem; color: var(--muted); margin-bottom: 4px; }
input[type="text"], input[type="number"], input[type="password"], input[type="date"], select, textarea { width: 100%; padding: 10px 12px; border-radius: var(--radius-sm); border: 2px solid var(--line); background: var(--panel); color: var(--text); }
input:focus, select:focus, textarea:focus { border-color: var(--blue-2); outline: none; }
textarea { min-height: 140px; resize: vertical; line-height: 1.6; }
textarea.writing { min-height: 320px; font-size: 1.05rem; }
.checks { display: flex; gap: 14px; flex-wrap: wrap; }
.checks label { display: inline-flex; gap: 6px; align-items: center; font-weight: 700; }

/* Home */
.hero { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 20px; align-items: stretch; }
@media (max-width: 760px) { .hero { grid-template-columns: 1fr; } }
.hero .mascot { font-size: 3.2rem; line-height: 1; }
.countdown { display: flex; gap: 10px; flex-wrap: wrap; margin: 10px 0; }
.countdown .cd { background: var(--bg-2); border-radius: var(--radius-sm); padding: 10px 14px; min-width: 150px; }
.countdown .cd b { display: block; font-family: var(--font-display); font-size: 1.6rem; line-height: 1; }
.session-card { background: linear-gradient(135deg, #1f4e9a, #2f80ed); color: #fff; border: none; }
.session-card h2, .session-card .muted { color: #fff; }
.session-card .muted { opacity: 0.85; }
.session-card .btn { background: var(--sun); color: #3a2c00; }
.session-card ul { padding-left: 18px; margin: 8px 0 0; columns: 2; font-size: 0.95rem; }
@media (max-width: 520px) { .session-card ul { columns: 1; } }
.vault { display: flex; align-items: center; gap: 16px; }
.vault .coin { font-size: 3rem; }
.vault .count { font-family: var(--font-display); font-size: 2.4rem; line-height: 1; }
.badges { display: flex; gap: 8px; flex-wrap: wrap; }
.badge { display: inline-flex; flex-direction: column; align-items: center; width: 92px; padding: 8px 4px; border-radius: 12px; background: var(--bg-2); font-size: 0.72rem; text-align: center; font-weight: 700; }
.badge .em { font-size: 1.6rem; }
.badge.locked { opacity: 0.35; filter: grayscale(1); }
.quick-links { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.quick-links a { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; padding: 14px; border-radius: 14px; background: var(--bg-2); text-decoration: none; color: var(--text); font-weight: 800; }
.quick-links a .em { font-size: 1.6rem; }
.quick-links a:hover { background: var(--sky); }

/* Progress bars */
.bar { height: 14px; border-radius: 999px; background: var(--bg-2); overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 999px; background: var(--blue-2); transition: width 0.4s ease; }
.subject-row { display: grid; grid-template-columns: 160px 1fr 60px; gap: 10px; align-items: center; margin-bottom: 10px; }
@media (max-width: 520px) { .subject-row { grid-template-columns: 110px 1fr 50px; } }
.subject-row .lbl { font-weight: 800; }
.skills-table { width: 100%; border-collapse: collapse; font-size: 0.93rem; }
.skills-table th, .skills-table td { padding: 6px 8px; border-bottom: 1px solid var(--line); text-align: left; }
.skills-table .bar { height: 8px; }
.lvl { font-weight: 800; }
.lvl-1 { color: var(--orange); } .lvl-2 { color: var(--blue-2); } .lvl-3 { color: var(--mint); }

/* Session player */
.player-top { position: sticky; top: 64px; z-index: 15; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 16px; display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; box-shadow: var(--shadow); }
.timer { font-family: var(--font-display); font-size: 1.8rem; font-variant-numeric: tabular-nums; min-width: 92px; }
.timer.warn { color: var(--coral); }
.block-label { font-weight: 800; }
.block-bar { flex: 1 1 160px; height: 10px; border-radius: 999px; background: var(--bg-2); overflow: hidden; }
.block-bar > i { display: block; height: 100%; background: var(--teal); transition: width 1s linear; }
.dots { display: flex; gap: 4px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--line); }
.dots i.done { background: var(--mint); }
.dots i.now { background: var(--blue-2); transform: scale(1.3); }
.streak { font-weight: 800; color: var(--orange); }

.question { animation: pop 0.25s ease; }
@keyframes pop { from { transform: scale(0.97); opacity: 0; } to { transform: none; opacity: 1; } }
.q-mode { margin-bottom: 8px; }
.q-prompt { font-size: 1.25rem; font-weight: 700; line-height: 1.45; margin-bottom: 14px; }
.q-visual { margin: 10px 0 16px; }
.options { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.options.svg { grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); }
.option { position: relative; text-align: left; padding: 12px 14px 12px 44px; border-radius: 14px; border: 2px solid var(--line); background: var(--panel); cursor: pointer; font-weight: 700; font-size: 1.05rem; transition: border-color 0.15s, background 0.15s; min-height: 52px; }
.option:hover:not(:disabled) { border-color: var(--blue-2); background: var(--sky); }
.option .key { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); width: 26px; height: 26px; border-radius: 8px; background: var(--bg-2); display: grid; place-items: center; font-size: 0.85rem; }
.option.svg { padding: 8px 8px 8px 8px; display: grid; justify-items: center; gap: 4px; }
.option.svg .key { position: static; transform: none; }
.option.svg svg { width: 100%; max-width: 120px; height: auto; }
.option.correct { border-color: var(--mint); background: #d8f5e3; color: #0f4d2a; }
.option.wrong { border-color: var(--coral); background: #ffe0e0; color: #7a1a1a; }
.option:disabled { cursor: default; }
.typed { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.typed input, .typed textarea { flex: 1 1 220px; font-size: 1.15rem; }
.typed .unit { font-weight: 800; color: var(--muted); }
.feedback { margin-top: 16px; padding: 14px 16px; border-radius: 14px; border: 2px solid; animation: pop 0.2s ease; }
.feedback.ok { border-color: var(--mint); background: #eafaf0; }
.feedback.bad { border-color: var(--coral); background: #fff0f0; }
.feedback.partial { border-color: var(--sun); background: #fff8df; }
.feedback.self { border-color: var(--grape); background: #f5edff; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .feedback.ok { background: #10301f; } :root:not([data-theme="light"]) .feedback.bad { background: #3a1616; } :root:not([data-theme="light"]) .feedback.partial { background: #3a3110; } :root:not([data-theme="light"]) .feedback.self { background: #2a1a3f; } :root:not([data-theme="light"]) .option.correct { background: #10301f; color: #c8f5d8; } :root:not([data-theme="light"]) .option.wrong { background: #3a1616; color: #ffd0d0; } }
.feedback .headline { font-family: var(--font-display); font-size: 1.25rem; margin-bottom: 4px; }
.feedback .explain { margin: 6px 0 0; }
.model { background: var(--bg-2); border-radius: 10px; padding: 10px 12px; margin-top: 8px; }
.selfmark { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }

.passage { background: var(--bg-2); border-radius: 14px; padding: 16px 18px; margin-bottom: 16px; max-height: 42vh; overflow: auto; line-height: 1.7; }
.passage h3 { margin-bottom: 2px; }
.passage p { margin: 0 0 0.9em; }
.passage.poem p { white-space: pre-line; }
.passage summary { cursor: pointer; font-weight: 800; }
.data-table { border-collapse: collapse; margin: 8px 0 12px; background: var(--panel); font-size: 0.95rem; }
.data-table th, .data-table td { border: 1px solid var(--line); padding: 5px 10px; text-align: left; }
.data-table caption { caption-side: top; font-weight: 800; text-align: left; padding: 4px 0; }
.timetable td { font-variant-numeric: tabular-nums; }
.figure { max-width: 320px; height: auto; display: block; }
.figure.chart { max-width: 420px; }
.fig-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.fig-row svg, .fig-grid svg { width: 86px; height: 86px; background: #fff; border: 2px solid var(--line); border-radius: 10px; }
.fig-q { width: 86px; height: 86px; border: 2px dashed var(--blue-2); border-radius: 10px; display: grid; place-items: center; font-family: var(--font-display); font-size: 2rem; color: var(--blue-2); }
.fig-grid { display: grid; gap: 8px; width: max-content; }
.fig-grid.cols-2 { grid-template-columns: repeat(2, 86px); }
.fig-grid.cols-3 { grid-template-columns: repeat(3, 86px); }
.coded { display: grid; justify-items: center; gap: 2px; font-weight: 800; }
.coded .code { font-family: var(--font-display); font-size: 1.1rem; }
.coded.target .code { color: var(--blue-2); }
.mirror-line { width: 4px; height: 86px; background: repeating-linear-gradient(to bottom, var(--coral) 0 8px, transparent 8px 14px); border-radius: 2px; }
.option.svg svg { background: #fff; border-radius: 8px; }

.block-intro { text-align: center; padding: 30px 20px; }
.block-intro .em { font-size: 3.5rem; }
.tip { background: #fff8df; border-left: 4px solid var(--sun); padding: 10px 14px; border-radius: 10px; color: #4a3a00; font-weight: 600; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .tip { background: #3a3110; color: #ffe9a3; } }
.pause-overlay { position: fixed; inset: 0; background: rgba(15, 23, 42, 0.75); display: grid; place-items: center; z-index: 40; color: #fff; text-align: center; }
.pause-overlay .box { background: var(--panel); color: var(--text); padding: 30px; border-radius: 20px; max-width: 420px; }

/* Wrap-up */
.results { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
.stat { background: var(--bg-2); border-radius: 14px; padding: 12px; text-align: center; }
.stat b { display: block; font-family: var(--font-display); font-size: 1.8rem; line-height: 1.1; }
.token-award { text-align: center; padding: 20px; border-radius: 18px; background: linear-gradient(135deg, #f2c94c, #f2994a); color: #3a2c00; margin: 16px 0; animation: pop 0.4s ease; }
.token-award .coin { font-size: 4rem; animation: spin 1.2s ease; display: inline-block; }
@keyframes spin { from { transform: rotateY(0) scale(0.5); } to { transform: rotateY(720deg) scale(1); } }

/* Writing & interview */
.plan-list { padding-left: 18px; }
.wordcount { font-weight: 800; color: var(--muted); }
.rubric { display: grid; gap: 8px; }
.rubric-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: center; background: var(--bg-2); padding: 8px 12px; border-radius: 10px; }
.stars { display: inline-flex; gap: 2px; }
.stars button { background: none; border: none; font-size: 1.3rem; cursor: pointer; padding: 0 2px; filter: grayscale(1); opacity: 0.5; }
.stars button.on { filter: none; opacity: 1; }
.fw-steps { display: grid; gap: 6px; }
.fw-steps div { background: var(--bg-2); padding: 8px 12px; border-radius: 10px; }
.fw-steps b { color: var(--blue-2); }
.speak-timer { font-family: var(--font-display); font-size: 3rem; text-align: center; }
.history-item { padding: 10px 0; border-bottom: 1px solid var(--line); }
.cat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; }
.cat-grid button { text-align: left; padding: 12px; border-radius: 12px; border: 2px solid var(--line); background: var(--panel); cursor: pointer; font-weight: 800; }
.cat-grid button:hover { border-color: var(--blue-2); }
.cat-grid button .em { font-size: 1.5rem; display: block; }

/* Guide */
.school-card { border-top: 6px solid var(--blue); }
.school-card.qeh { border-top-color: #8a1538; }
.papers { width: 100%; border-collapse: collapse; font-size: 0.93rem; }
.papers th, .papers td { padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; text-align: left; }

/* Toast and confetti */
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 999px; font-weight: 800; z-index: 60; box-shadow: var(--shadow); }
.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 55; }
.xp-pop { position: fixed; pointer-events: none; font-family: var(--font-display); font-weight: 700; color: var(--mint); animation: rise 0.9s ease forwards; z-index: 56; }
@keyframes rise { from { opacity: 1; transform: translateY(0); } to { opacity: 0; transform: translateY(-50px); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }

/* Mini-lessons and hints */
.lesson { background: linear-gradient(135deg, #eef6ff, #f3eeff); border: 2px solid var(--line); border-radius: var(--radius); padding: 20px 22px; animation: pop 0.25s ease; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .lesson { background: linear-gradient(135deg, #16243d, #221a3d); } }
.lesson.compact { padding: 14px 16px; margin-top: 10px; }
.lesson-head { display: flex; gap: 14px; align-items: center; margin-bottom: 10px; }
.lesson-head .em { font-size: 2.6rem; line-height: 1; }
.lesson.compact .lesson-head .em { font-size: 1.8rem; }
.lesson-head h2, .lesson-head h3 { margin: 0; }
.lesson-steps { margin: 0 0 12px; padding-left: 22px; }
.lesson-steps li { margin-bottom: 8px; }
.lesson-ex { background: var(--panel); border-radius: 12px; padding: 10px 14px; border: 1px solid var(--line); }
.lesson-remember { margin: 10px 0 0; font-weight: 700; color: var(--blue-2); }
.help-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.help-note { font-size: 0.8rem; color: var(--muted); flex: 1 1 200px; }
.hint-panel { flex-basis: 100%; background: #fff8df; border-left: 4px solid var(--sun); padding: 10px 14px; border-radius: 10px; color: #4a3a00; font-weight: 600; animation: pop 0.2s ease; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .hint-panel { background: #3a3110; color: #ffe9a3; } }
.lesson-panel { flex-basis: 100%; }
#hint-meter { font-size: 0.78rem; }