:root{--bg: #f5f6f8;--surface: #ffffff;--surface-alt: #f0f2f5;--border: #dfe3e8;--text: #1c2530;--muted: #5d6b7a;--accent: #1f5f8b;--accent-soft: #e7f0f7;--success: #1f7a4d;--success-soft: #e6f4ec;--warning: #8a5a12;--warning-soft: #fdf3e0;--danger: #a32b2b;--danger-soft: #fbeaea;--radius: 10px;--shadow: 0 1px 2px rgba(20, 30, 45, .06), 0 4px 14px rgba(20, 30, 45, .05)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,-apple-system,Helvetica Neue,sans-serif;font-size:15px;line-height:1.5}h1,h2,h3,h4{margin:0 0 8px;line-height:1.25}h1{font-size:24px}h2{font-size:19px}h3{font-size:16px}p{margin:0 0 10px}a{color:var(--accent)}.app{min-height:100vh;display:flex;flex-direction:column}.topbar{background:var(--surface);border-bottom:1px solid var(--border);padding:10px 20px;display:flex;align-items:center;gap:18px;flex-wrap:wrap;position:sticky;top:0;z-index:20}.brand{font-weight:700;font-size:17px;letter-spacing:-.2px}.brand 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.3s}.game-item:disabled{cursor:default}.game-tag{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.4px;color:var(--success)}.game-note{font-size:13px;color:var(--muted)}.game-rank{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:50%;background:var(--success);color:#fff;font-size:13px;font-weight:700}.game-score{color:var(--muted);font-size:14px}.game-done{background:var(--success-soft);border-left:5px solid var(--success);padding:12px 16px;border-radius:10px;font-size:15px}@keyframes game-shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}@media(prefers-reduced-motion:reduce){.game-item{transition:none}.game-item.miss{animation:none}}.game-formula{font-size:26px;font-weight:700;text-align:center;color:var(--accent)}.game-slider{display:flex;flex-direction:column;gap:6px}.game-slider-label{font-size:17px}.game-slider input[type=range]{width:100%;accent-color:var(--accent);height:28px}.game-slider-range{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}.game-output{display:grid;grid-template-columns:1fr auto;gap:4px 12px;align-items:baseline;border:2px solid var(--border);border-radius:12px;padding:12px 16px;background:var(--surface-alt)}.game-output.hit{border-color:var(--success);background:var(--success-soft)}.game-output-label{font-size:15px;color:var(--muted)}.game-output-value{font-size:28px;font-weight:700;font-variant-numeric:tabular-nums}.game-output-bar{grid-column:1 / -1;height:10px;border-radius:999px;background:#1f5f8b26;overflow:hidden}.game-output-bar>span{display:block;height:100%;background:var(--accent);transition:width .15s}.game-output.hit .game-output-bar>span{background:var(--success)}.game-output-target{grid-column:1 / -1;font-size:14px;color:var(--muted)}.board .game-items{gap:14px}.board .game-item{font-size:21px;padding:14px 18px}.board .game-bucket{font-size:20px;padding:10px 20px}.board .game-note{font-size:16px}.board .game-score{font-size:18px}.board .game-done{font-size:21px}.board .game-formula{font-size:34px}.board .game-slider-label{font-size:23px}.board .game-output-value{font-size:40px}.board .game-output-label,.board .game-output-target{font-size:18px}.viz-formula-box{display:flex;flex-direction:column;gap:10px}.viz-formula-main{font-size:30px;font-weight:700;text-align:center;color:var(--viz-ink);background:var(--viz-fill);border:2px solid var(--v1);border-radius:12px;padding:14px 10px}.viz-legend{margin:0;display:flex;flex-direction:column;gap:6px}.viz-legend-row{display:grid;grid-template-columns:2.4em 1fr;gap:10px;align-items:baseline}.viz-legend dt{font-weight:700;font-size:17px}.viz-legend dd{margin:0;color:var(--viz-muted);font-size:14px}.board .viz-formula-main{font-size:40px}.board .viz-legend dt{font-size:22px}.board .viz-legend dd{font-size:18px}.quiz-question{border:1px solid var(--border);border-radius:9px;padding:10px 12px;margin-top:10px}.quiz-question .prompt{font-weight:600;margin-bottom:6px}.quiz-explain{color:var(--muted);font-size:13.5px;margin-top:6px}.pairs-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:8px;margin-top:8px}.pairs-grid>div{border:1px solid var(--border);border-radius:8px;padding:7px 10px}.pairs-grid .pair-left{background:var(--surface-alt);font-weight:600}.board-split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:36px;align-items:start}.board-split.single{grid-template-columns:minmax(0,1fr)}.board-col{display:flex;flex-direction:column;gap:18px;min-width:0}.board-aside{display:flex;flex-direction:column;gap:14px;min-width:0;justify-content:center}.board-aside .viz,.board-aside .board-figure{max-width:560px;width:100%;margin:0 auto}.board-aside img{max-width:100%;border-radius:12px}.board-quiz{display:flex;flex-direction:column;gap:16px}.board-quiz.columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 36px}@media(max-width:1100px){.board-quiz.columns{grid-template-columns:minmax(0,1fr)}}.board-quiz .quiz-prompt{font-size:23px;font-weight:600;margin-bottom:10px}.board-quiz .quiz-index{color:var(--muted);font-size:16px;margin-bottom:4px}.board-answers{display:flex;flex-direction:column;gap:10px}.board-answers button{text-align:left;font-size:20px;padding:12px 18px;border:2px solid var(--border);background:var(--surface);color:var(--text);border-radius:12px;width:100%;line-height:1.35}.board-answers button:hover{border-color:var(--accent)}.board-answers button.picked{border-color:#c98500;background:var(--warning-soft)}.board-answers button.correct{border-color:var(--success);background:var(--success-soft)}.board-answers button.wrong{border-color:var(--danger);background:var(--danger-soft)}.board-answers .mark{font-weight:700;margin-right:10px}.board-explain{font-size:19px;color:var(--muted);border-left:4px solid var(--success);padding-left:14px}.board-pairs{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px}.board-pairs button{text-align:left;font-size:18px;padding:11px 14px;border:2px solid var(--border);background:var(--surface);color:var(--text);border-radius:10px;width:100%;line-height:1.3}.board-pairs button.picked{border-color:#c98500;background:var(--warning-soft)}.board-pairs button.matched{border-color:var(--success);background:var(--success-soft)}.board-pairs button.missed{border-color:var(--danger);background:var(--danger-soft)}.board-pairs-hint{grid-column:1 / -1;color:var(--muted);font-size:16px}@media(max-width:1100px){.board-split{grid-template-columns:minmax(0,1fr);gap:20px}}.listing-card{display:flex;flex-direction:column;gap:8px}.listing-card .price{font-size:20px;font-weight:700;color:var(--accent)}.listing-meta{display:flex;gap:10px;flex-wrap:wrap;font-size:13px;color:var(--muted)}.preview-block{border:1px dashed var(--border);border-radius:8px;padding:12px;background:var(--surface-alt)}.outline-item{display:flex;gap:10px;align-items:center;padding:7px 0;border-bottom:1px dashed var(--border);font-size:14px}.outline-item:last-child{border-bottom:none}.lock{color:var(--muted);font-size:12.5px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f161e8c;z-index:90;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;overflow:auto}.modal{background:var(--surface);border-radius:12px;padding:20px;width:min(680px,100%);box-shadow:0 12px 40px #00000040}.auth-wrap{max-width:420px;margin:8vh auto}.tabs{display:flex;gap:6px;margin-bottom:16px}.tabs button{flex:1}.tabs button.active{background:var(--accent-soft);color:var(--accent);border-color:var(--accent-soft);font-weight:600}.progress-bar{height:8px;background:var(--surface-alt);border-radius:999px;overflow:hidden}.progress-bar>div{height:100%;background:var(--accent);transition:width .3s}@media(max-width:640px){.content{padding:16px 12px 48px}.board{padding:10px}.board-main{padding:18px 16px;border-radius:14px}.board-title{font-size:26px}.board-text{font-size:19px}}.whiteboard{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;background:#fff}.whiteboard.over-lesson{background:transparent}.whiteboard-canvas{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;touch-action:none;cursor:crosshair}.whiteboard-toolbar{position:absolute;left:50%;bottom:18px;transform:translate(-50%);display:flex;flex-direction:column;gap:8px;padding:12px 16px;background:#fffffff5;border:1px solid var(--border);border-radius:14px;box-shadow:0 10px 30px #141e2d38;max-width:min(96vw,1000px)}.whiteboard-toolbar button{background:var(--surface);color:var(--text);border-color:var(--border)}.whiteboard-toolbar button.primary{background:var(--accent);border-color:var(--accent);color:#fff}.whiteboard-toolbar select{background:var(--surface);color:var(--text);border-color:var(--border)}.whiteboard-toolbar .swatch{width:28px;height:28px;border-radius:50%;border:1px solid var(--border);padding:0}.whiteboard-text-box{position:absolute;display:flex;flex-direction:column;gap:6px;z-index:2}.whiteboard-text-box button{background:var(--surface);color:var(--text);border-color:var(--border)}.whiteboard-text-box button.primary{background:var(--accent);border-color:var(--accent);color:#fff}.whiteboard-text-input{min-width:260px;min-height:56px;padding:6px 8px;background:#fffffff2;color:var(--text);border:1px dashed var(--accent);border-radius:8px;font-size:20px;resize:none}@media(max-width:720px){.whiteboard-toolbar{left:8px;right:8px;transform:none;max-width:none}}