:root{color-scheme:light;--bg: #f7f3ec;--bg-elevated: #fffdf9;--surface: #ffffff;--surface-2: #f1ebe1;--border: #e3dacb;--border-strong: #cbbfab;--text: #1d1a16;--text-muted: #5f574c;--text-subtle: #7a7064;--primary: #a3141b;--primary-hover: #8a1016;--primary-soft: #fbe9e9;--on-primary: #ffffff;--accent: #f1bf00;--accent-soft: #fff4c9;--accent-ink: #6b5200;--success: #1c7a43;--success-soft: #e3f4e9;--success-border: #8fd0a8;--danger: #b42318;--danger-soft: #fdecea;--danger-border: #f2a59d;--info: #1f5fa8;--info-soft: #e7f0fb;--radius-sm: 8px;--radius: 14px;--radius-lg: 22px;--shadow-sm: 0 1px 2px rgb(40 30 15 / .06);--shadow: 0 1px 2px rgb(40 30 15 / .05), 0 6px 20px -8px rgb(40 30 15 / .18);--focus: 0 0 0 3px var(--bg), 0 0 0 5px var(--primary);--font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;--container: 960px}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){color-scheme:dark;--bg: #15120f;--bg-elevated: #1c1814;--surface: #211c17;--surface-2: #2a241e;--border: #3a322a;--border-strong: #514639;--text: #f3ede4;--text-muted: #c2b7a8;--text-subtle: #a29685;--primary: #ff6b6b;--primary-hover: #ff8585;--primary-soft: #3a1c1c;--on-primary: #1d0b0b;--accent: #f5cc33;--accent-soft: #3a3115;--accent-ink: #f5d76b;--success: #5dd28e;--success-soft: #16301f;--success-border: #2f6b45;--danger: #ff8a80;--danger-soft: #3a1b18;--danger-border: #7a3a33;--info: #8cbcf5;--info-soft: #182637;--shadow-sm: 0 1px 2px rgb(0 0 0 / .4);--shadow: 0 1px 2px rgb(0 0 0 / .4), 0 8px 24px -10px rgb(0 0 0 / .6)}}:root[data-theme=dark]{color-scheme:dark;--bg: #15120f;--bg-elevated: #1c1814;--surface: #211c17;--surface-2: #2a241e;--border: #3a322a;--border-strong: #514639;--text: #f3ede4;--text-muted: #c2b7a8;--text-subtle: #a29685;--primary: #ff6b6b;--primary-hover: #ff8585;--primary-soft: #3a1c1c;--on-primary: #1d0b0b;--accent: #f5cc33;--accent-soft: #3a3115;--accent-ink: #f5d76b;--success: #5dd28e;--success-soft: #16301f;--success-border: #2f6b45;--danger: #ff8a80;--danger-soft: #3a1b18;--danger-border: #7a3a33;--info: #8cbcf5;--info-soft: #182637;--shadow-sm: 0 1px 2px rgb(0 0 0 / .4);--shadow: 0 1px 2px rgb(0 0 0 / .4), 0 8px 24px -10px rgb(0 0 0 / .6)}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:80px}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-sans);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased}h1,h2,h3{font-family:var(--font-serif);line-height:1.2;margin:0;text-wrap:balance;letter-spacing:-.01em}h1{font-size:clamp(1.75rem,1.2rem + 2.2vw,2.5rem)}h2{font-size:1.4rem}h3{font-size:1.12rem}p{margin:0;text-wrap:pretty}a{color:var(--primary);text-underline-offset:3px}button,input,select,textarea{font:inherit;color:inherit}:focus-visible{outline:none;box-shadow:var(--focus)}img,svg{display:block}.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}.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:16px}@media(min-width:640px){.container{padding-inline:24px}}.stack{display:flex;flex-direction:column;gap:var(--gap, 16px)}.row{display:flex;align-items:center;gap:var(--gap, 12px);flex-wrap:wrap}.muted{color:var(--text-muted)}.subtle{color:var(--text-subtle);font-size:.9rem}.eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--primary)}.page{padding-block:28px 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var(--border-strong);background:var(--surface);color:var(--text);font-weight:600;font-size:.95rem;line-height:1.2;text-decoration:none;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease;white-space:nowrap}.btn:hover{background:var(--surface-2)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}.btn-primary:hover{background:var(--primary-hover);border-color:var(--primary-hover)}.btn-ghost{background:transparent;border-color:transparent}.btn-ghost:hover{background:var(--surface-2)}.btn-danger{color:var(--danger);border-color:var(--danger-border)}.btn-sm{min-height:36px;padding:6px 14px;font-size:.875rem}.btn-icon{width:44px;padding:0}.btn-block{width:100%}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:6px 14px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--text-muted);font-size:.875rem;font-weight:600;cursor:pointer}.chip:hover{border-color:var(--border-strong);color:var(--text)}.chip[aria-pressed=true],.chip[aria-checked=true],.chip.is-active{background:var(--text);border-color:var(--text);color:var(--bg)}.chip .count{font-variant-numeric:tabular-nums;opacity:.75}.badge{display:inline-flex;align-items:center;gap:4px;padding:2px 10px;border-radius:999px;font-size:.75rem;font-weight:700;background:var(--surface-2);color:var(--text-muted);white-space:nowrap}.badge-success{background:var(--success-soft);color:var(--success)}.badge-danger{background:var(--danger-soft);color:var(--danger)}.badge-accent{background:var(--accent-soft);color:var(--accent-ink)}.badge-primary{background:var(--primary-soft);color:var(--primary)}.bar{display:flex;height:8px;border-radius:999px;background:var(--surface-2);overflow:hidden}.bar>span{display:block;height:100%;transition:width .4s ease}.bar 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.mark{flex:none;margin-left:auto;align-self:center}.option.is-selected{border-color:var(--text);background:var(--surface)}.option.is-selected .letter{background:var(--text);border-color:var(--text);color:var(--bg)}.option.is-correct{border-color:var(--success-border);background:var(--success-soft)}.option.is-correct .label{text-decoration:underline;text-decoration-color:var(--success);text-decoration-thickness:2px;text-underline-offset:4px;font-weight:600}.option.is-correct .letter{background:var(--success);border-color:var(--success);color:var(--surface)}.option.is-wrong{border-color:var(--danger-border);background:var(--danger-soft)}.option.is-wrong .letter{background:var(--danger);border-color:var(--danger);color:var(--surface)}.option.is-dimmed{opacity:.6}.explanation{margin-top:14px;padding:14px 16px;border-radius:var(--radius-sm);background:var(--info-soft);border-left:4px solid var(--info);font-size:.95rem;display:flex;flex-direction:column;gap:8px}.explanation .title{font-weight:700;color:var(--info);font-size:.82rem;text-transform:uppercase;letter-spacing:.06em}.explanation .note{padding:10px 12px;border-radius:var(--radius-sm);background:var(--accent-soft);color:var(--text);font-size:.9rem}.explanation a{font-weight:600;font-size:.875rem}.input{width:100%;min-height:44px;padding:10px 14px;border-radius:999px;border:1px solid var(--border-strong);background:var(--surface)}.input::placeholder{color:var(--text-subtle)}.toggle{display:inline-flex;align-items:center;gap:10px;cursor:pointer;font-weight:600;font-size:.95rem;-webkit-user-select:none;user-select:none}.toggle input{appearance:none;width:44px;height:26px;border-radius:999px;background:var(--border-strong);position:relative;cursor:pointer;transition:background .2s ease;flex:none;margin:0}.toggle input:after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:#fff;box-shadow:var(--shadow-sm);transition:transform .2s ease}.toggle 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