:root{--bg-canvas: #f8fafc;--bg-surface: #ffffff;--bg-subtle: #f1f5f9;--bg-hover: #e2e8f0;--bg-elevated: #ffffff;--ink-primary: #0f172a;--ink-secondary: #334155;--ink-muted: #64748b;--ink-faint: #94a3b8;--ink-inverse: #ffffff;--accent-primary: #2563eb;--accent-hover: #1d4ed8;--accent-active: #1e40af;--accent-soft: #eff6ff;--accent-border: #bfdbfe;--accent-text: #1d4ed8;--success-primary: #059669;--success-soft: #ecfdf5;--success-border: #a7f3d0;--success-text: #065f46;--warn-primary: #d97706;--warn-soft: #fffbeb;--warn-border: #fde68a;--warn-text: #92400e;--danger-primary: #dc2626;--danger-soft: #fef2f2;--danger-border: #fecaca;--danger-text: #991b1b;--info-primary: #0284c7;--info-soft: #f0f9ff;--info-border: #bae6fd;--info-text: #0369a1;--border-subtle: #e2e8f0;--border-strong: #cbd5e1;--border-focus: #2563eb;--border-interactive: #94a3b8;--r-xs: 4px;--r-sm: 6px;--r-md: 8px;--r-lg: 12px;--r-xl: 16px;--r-pill: 9999px;--shadow-xs: 0 1px 2px rgba(15, 23, 42, .04);--shadow-sm: 0 1px 3px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .03);--shadow-md: 0 4px 6px -1px rgba(15, 23, 42, .06), 0 2px 4px -2px rgba(15, 23, 42, .03);--shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, .07), 0 4px 6px -4px rgba(15, 23, 42, .03);--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-math: "KaTeX_Main", "Times New Roman", serif;--font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;--sp-1: 4px;--sp-2: 8px;--sp-3: 12px;--sp-4: 16px;--sp-5: 20px;--sp-6: 24px;--sp-8: 32px;--sp-10: 40px;--sp-12: 48px;--sp-16: 64px;--ease-out: cubic-bezier(.16, 1, .3, 1);--duration-fast: .14s;--duration-normal: .22s;--unit-1: #2563eb;--unit-2: #0891b2;--unit-3: #059669;--unit-4: #7c3aed;--unit-5: #d97706;--unit-6: #db2777;--unit-7: #4f46e5;--unit-8: #0d9488;--unit-9: #ea580c;--unit-10: #0284c7;--unit-11: #65a30d;--unit-12: #9333ea;--primary: var(--accent-primary);--primary-hover: var(--accent-hover);--primary-strong: var(--accent-active);--primary-soft: var(--accent-soft);--primary-ink: var(--accent-text);--secondary: var(--info-primary);--secondary-soft: var(--info-soft);--surface: var(--bg-surface);--surface-1: var(--bg-surface);--surface-2: var(--bg-subtle);--surface-3: var(--bg-hover);--canvas: var(--bg-canvas);--bg: var(--bg-canvas);--ink: var(--ink-primary);--ink-2: var(--ink-secondary);--ink-3: var(--ink-muted);--border: var(--border-subtle);--border-strong: var(--border-strong);--success: var(--success-primary);--success-soft: var(--success-soft);--success-strong: var(--success-text);--warn: var(--warn-primary);--warn-soft: var(--warn-soft);--danger: var(--danger-primary);--danger-soft: var(--danger-soft);--info: var(--info-primary);--info-soft: var(--info-soft);--focus: var(--border-focus);--locked: var(--ink-muted);--locked-soft: var(--bg-subtle);--t-fast: var(--duration-fast);--t-med: var(--duration-normal);--topbar-h: 56px;--bottomnav-h: 60px;--content-max: 1180px;--font-ui: 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var(--success-border);color:var(--success-text)}.feedback-card--wrong{background:var(--danger-soft);border:1px solid var(--danger-border);color:var(--danger-text)}.feedback-card--hint{background:var(--warn-soft);border:1px solid var(--warn-border);color:var(--warn-text)}.math{font-family:var(--font-math);color:var(--ink-primary)}.math--inline{display:inline-block;vertical-align:-.1em;padding:0 1px}.math--block{display:block;text-align:center;margin:var(--sp-4) 0;overflow-x:auto;overflow-y:hidden;padding:var(--sp-2) 0}.katex-display{margin:var(--sp-3) 0!important;overflow-x:auto;overflow-y:hidden}.admin-shell{max-width:1200px;margin:0 auto;padding:var(--sp-6) var(--sp-4)}.admin-badge{display:inline-block;padding:2px 8px;border-radius:var(--r-xs);font-size:11.5px;font-weight:700;text-transform:uppercase}.admin-badge--isolated{background:#fef3c7;color:#92400e;border:1px solid #fde68a}.muted{color:var(--ink-muted);font-size:14px}.row{display:flex;align-items:center;gap:var(--sp-3);flex-wrap:wrap}.mt{margin-top:var(--sp-3)}.mb{margin-bottom:var(--sp-3)}.center{text-align:center}.panel{background:var(--bg-surface);border:1.5px solid var(--border-subtle);border-radius:var(--r-lg);padding:var(--sp-5);box-shadow:var(--shadow-sm)}.panel--good{border-color:#bfe6d3;background:var(--success-soft)}.panel--hot{border-color:#c7d2fe;background:linear-gradient(135deg,#eef0fe,#e6f6fe)}.panel--muted{background:var(--bg-subtle);border-style:dashed}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:var(--sp-2);padding:var(--sp-10) var(--sp-6);background:var(--bg-surface);border:1.5px dashed var(--border-strong);border-radius:var(--r-lg);color:var(--ink-secondary)}.empty-state__icon{font-size:40px}.empty-state__title{font-size:18px;font-weight:700;margin:var(--sp-2) 0 0;color:var(--ink-primary)}.empty-state__text{max-width:420px;margin:0 auto}.loading-state{display:flex;align-items:center;justify-content:center;gap:var(--sp-3);padding:var(--sp-10);color:var(--ink-muted);font-weight:600}.loading-state__spinner{width:22px;height:22px;border:3px solid var(--bg-hover);border-top-color:var(--accent-primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.hero{background:linear-gradient(135deg,var(--accent-soft) 0%,#e6f6fe 100%);border-radius:var(--r-xl);padding:var(--sp-8) var(--sp-6);margin-bottom:var(--sp-6);border:1px solid var(--accent-border);text-align:center}.hero__badge{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.04em;color:var(--accent-text);background:#ffffffbf;border:1px solid var(--accent-border);border-radius:var(--r-pill);padding:4px 14px;margin-bottom:var(--sp-3)}.hero__title{font-size:28px;font-weight:800;margin:0 0 var(--sp-2);color:var(--ink-primary);letter-spacing:-.02em}.hero__sub{font-size:16px;color:var(--ink-secondary);max-width:480px;margin:0 auto var(--sp-4);line-height:1.6}.hero-actions{display:flex;gap:var(--sp-3);flex-wrap:wrap;justify-content:center}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:var(--sp-4)}.field__label{font-size:13px;font-weight:700;color:var(--ink-secondary)}.field__input{font-family:inherit;font-size:15px;color:var(--ink-primary);background:var(--bg-surface);border:1.5px solid var(--border-strong);border-radius:var(--r-md);padding:11px 14px;transition:border-color var(--duration-fast),box-shadow var(--duration-fast);width:100%}.field__input:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-soft)}.field__input::placeholder{color:var(--ink-faint)}.card{display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--r-md);font-size:15px;font-weight:600;color:var(--ink);transition:border-color var(--t-fast),background var(--t-fast),transform var(--t-fast),box-shadow var(--t-fast);-webkit-user-select:none;user-select:none}button.card{cursor:pointer}button.card:hover:not(:disabled){border-color:var(--primary);background:var(--primary-soft)}button.card:disabled{opacity:.55;cursor:not-allowed}.card--in{border-color:var(--primary);background:var(--primary-soft);color:var(--primary-ink)}.card--sel{border-color:var(--primary);background:var(--primary);color:#fff;box-shadow:var(--shadow-sm)}.card--ok{border-color:var(--success);background:var(--success-soft);color:var(--success-strong)}.card--bad{border-color:var(--danger);background:var(--danger-soft);color:var(--danger)}.card--used{opacity:.55;border-style:dashed}.card--token{border-radius:var(--r-pill);background:var(--surface-2);border-color:var(--border-strong);font-family:var(--font-math);font-size:17px;padding:8px 16px}.card--op{min-width:52px;font-family:var(--font-math);font-size:18px}.chip{display:inline-flex;align-items:center;gap:4px;padding:4px 10px;border-radius:var(--r-pill);background:var(--surface-2);color:var(--ink-2);font-size:12.5px;font-weight:600;white-space:nowrap;border:1px solid transparent}.chip--good{background:var(--success-soft);color:var(--success-strong)}.chip--warn{background:var(--warn-soft);color:var(--warn)}.chip--bad{background:var(--danger-soft);color:var(--danger)}.chip--info{background:var(--info-soft);color:var(--info)}.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:var(--r-sm);font-size:12px;font-weight:700;background:var(--surface-2);color:var(--ink-2)}.badges{display:flex;flex-wrap:wrap;gap:var(--sp-2)}.badges-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:var(--sp-3)}.badge-card{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-4);background:var(--surface);border:1.5px solid var(--border);border-radius:var(--r-lg)}.badge-card__icon{display:grid;place-items:center;width:48px;height:48px;border-radius:var(--r-md);background:var(--warn-soft);font-size:26px;flex:none}.badge-card__body{display:flex;flex-direction:column;gap:2px}.badge-card__name{font-weight:700;font-size:15px}.badge-card__desc{font-size:13px;color:var(--ink-2)}.badge-card__date{font-size:12px;color:var(--ink-3)}.progress{height:8px;border-radius:var(--r-pill);background:var(--surface-3);overflow:hidden}.progress__fill{height:100%;border-radius:var(--r-pill);background:linear-gradient(90deg,var(--primary),var(--secondary));transition:width .3s ease}.stars{display:inline-flex;gap:2px;font-size:16px;line-height:1}.star{color:var(--border-strong)}.star--on{color:#f59e0b}.callout{display:flex;gap:var(--sp-3);padding:var(--sp-4);border-radius:var(--r-lg);background:var(--info-soft);border:1px solid #cddcfb;margin-bottom:var(--sp-4)}.callout--good{background:var(--success-soft);border-color:#bfe6d3}.callout--warn{background:var(--warn-soft);border-color:#f3ddb4}.callout--think{background:var(--surface-2);border-color:var(--border)}.callout--danger{background:var(--danger-soft);border-color:#f5c6c6}.callout__title{font-weight:700;margin-bottom:2px;color:var(--ink)}.callout__body{font-size:14.5px;color:var(--ink-2)}.callout__body p{margin:0 0 6px}.callout__body p:last-child{margin-bottom:0}.feedback{display:flex;align-items:flex-start;gap:var(--sp-3);padding:var(--sp-3) var(--sp-4);border-radius:var(--r-md);font-size:14.5px;margin:var(--sp-3) 0;border:1px solid transparent;animation:feedback-in .18s ease}@keyframes 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var(--sp-2);overflow-x:auto;min-width:260px}.numberline__axis{position:absolute;top:20px;left:0;right:0;display:flex;align-items:center;gap:0}.numberline__line{flex:1;height:3px;background:var(--ink-2);border-radius:2px}.numberline__arrow{font-size:11px;color:var(--ink-2);line-height:1;flex:none}.numberline__arrow--left{margin-right:2px}.numberline__arrow--right{margin-left:2px}.numberline__markers{position:absolute;top:0;left:0;right:0;height:34px;pointer-events:none}.numberline__marker{position:absolute;transform:translate(-50%);top:0;background:var(--primary);color:#fff;font-size:13px;font-weight:700;padding:2px 8px;border-radius:var(--r-pill);white-space:nowrap;font-family:var(--font-math);box-shadow:0 2px 6px #0000001f}.numberline__marker 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