:root{color-scheme:dark;--bg: #1b1d22;--bg-deep: #141619;--surface: #24272d;--surface-2: #2b2f36;--ink: #eceef2;--ink-2: #a8adb7;--ink-3: #8f95a0;--line: #353a43;--line-strong: #474d58;--primary: #5b93ff;--primary-strong: #7dabff;--primary-soft: #222c40;--on-primary: #ffffff;--accent: #5b93ff;--accent-soft: #222c40;--ok: #62c48f;--ok-soft: #1f3529;--bad: #f07d6b;--bad-soft: #3e2521;--warn-soft: #3a3324;--focus: #9dbdff;--shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 16px 40px -18px rgba(0, 0, 0, .7);--ruled-line: rgba(91, 147, 255, .14);--dot: rgba(236, 238, 242, .16);--font-display: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--radius-s: 4px;--radius: 8px;--radius-l: 14px;--measure: 1120px;--gutter: 16px;--header-h: 64px}:root[data-theme=light]{color-scheme:light;--bg: #f3f4f7;--bg-deep: #e9ebf0;--surface: #ffffff;--surface-2: #f7f8fa;--ink: #1b1d22;--ink-2: #4d535e;--ink-3: #5f6673;--line: #cdd1da;--line-strong: #b3b9c5;--primary: #2a66d9;--primary-strong: #1f52b8;--primary-soft: #e3ecfc;--on-primary: #ffffff;--accent: #2a66d9;--accent-soft: #e3ecfc;--ok: #1a7a4b;--ok-soft: #dff3e8;--bad: #c2402d;--bad-soft: #fbe4e0;--warn-soft: #fbf1d6;--focus: #1f52b8;--shadow: 0 1px 2px rgba(27, 29, 34, .06), 0 16px 40px -18px rgba(27, 29, 34, .25);--ruled-line: rgba(42, 102, 217, .14);--dot: rgba(27, 29, 34, .34)}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:1rem;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}#root{display:flex;flex-direction:column;min-height:100vh}main{flex:1 0 auto}h1,h2,h3{font-family:var(--font-display);font-weight:700;line-height:1.15;letter-spacing:-.02em;margin:0 0 .5em;text-wrap:balance}h1{font-size:clamp(2rem,1.4rem + 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.15s ease,transform .15s ease}.button:hover{background:var(--primary-strong);border-color:var(--primary-strong);color:var(--on-primary)}.button:active{transform:translateY(1px)}.button:disabled{opacity:.55;cursor:not-allowed;transform:none}.button.secondary{background:transparent;color:var(--primary)}.button.secondary:hover{background:var(--primary-soft);color:var(--primary)}.button.small{min-height:36px;padding:6px 14px;font-size:.9rem}.button.full{width:100%}.button.white{background:var(--on-primary);border-color:var(--on-primary);color:var(--primary)}.button.white:hover{background:var(--surface);border-color:var(--surface)}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;border:1px solid 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span{font-family:var(--font-display);font-size:1rem;color:var(--ink-3)}.feature h3{margin-bottom:.4em}.feature p{color:var(--ink-2)}.landing>.fine-print{margin-top:48px}.auth-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,440px);gap:56px;align-items:center;padding-top:56px}.auth-intro>p{color:var(--ink-2);font-size:1.1rem;margin-bottom:28px}.auth-benefit{display:flex;align-items:center;gap:12px;padding:10px 0;border-top:1px solid var(--line);font-weight:500}.auth-benefit:last-child{border-bottom:1px solid var(--line)}.auth-benefit svg{color:var(--ok)}.auth-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-l);padding:32px;box-shadow:var(--shadow)}.auth-icon{color:var(--primary);margin-bottom:12px}.auth-card h2{font-size:1.5rem}.auth-card>p{color:var(--ink-2)}.auth-card form{display:grid;gap:16px;margin-bottom:12px}.auth-card 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var(--line);border-radius:var(--radius-l)}.stat-icon{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:50%;background:var(--primary-soft);color:var(--primary)}.stat>div{display:flex;flex-direction:column}.stat span{font-size:.8125rem;color:var(--ink-2)}.stat strong{font-family:var(--font-display);font-size:1.75rem;line-height:1.1}.dashboard-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:32px;align-items:start}.dashboard-grid>div,.dashboard-grid>aside{display:grid;gap:24px}.practice-panel h2{margin-top:8px}.field-label{margin-bottom:8px}.topic-select{margin-bottom:6px}.count-fieldset{margin:20px 0}.count-fieldset legend{margin-bottom:10px;font-size:.9rem}.count-options{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.count-choice{position:relative;display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:12px 14px;border:1px solid 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auto;gap:10px;align-items:baseline;margin-bottom:6px;font-size:.9rem}.domain-number{font-family:var(--font-display);color:var(--ink-3);font-variant-numeric:tabular-nums}.domain-title strong{font-variant-numeric:tabular-nums}.study-note{position:relative;padding:22px 24px;border-radius:var(--radius-l);background:var(--surface-2);border:1px solid var(--line)}.study-note h3{font-style:italic;font-weight:500}.study-note p{color:var(--ink-2);font-size:.95rem}.study-note>svg{position:absolute;right:20px;bottom:18px;color:var(--line-strong)}.history .panel{margin:24px 0;padding:8px 20px 0}.history .panel .session-list{border-top:0}.history .panel>p{padding:16px 0}.practice-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:24px;font-size:.9rem;color:var(--ink-2)}.practice-top span{display:inline-flex;align-items:center;gap:6px}.practice-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:32px;align-items:start}.practice-sidebar{position:sticky;top:calc(var(--header-h) + 16px)}.practice-sidebar h2{font-size:1.35rem}.practice-sidebar>p{color:var(--ink-2);font-size:.9rem}.practice-sidebar .progress-track{margin:16px 0 8px}.practice-sidebar .row-between{font-size:.85rem}.practice-sidebar .fine-print{margin:16px 0}.question-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px;margin-top:20px}.question-grid button{aspect-ratio:1;min-width:0;padding:0;border:1px solid var(--line-strong);border-radius:var(--radius-s);background:var(--surface);color:var(--ink-2);font:inherit;font-size:.85rem;font-weight:600;font-variant-numeric:tabular-nums;cursor:pointer}.question-grid button:hover{border-color:var(--primary);color:var(--ink)}.question-grid button.correct{background:var(--ok-soft);border-color:var(--ok);color:var(--ok)}.question-grid button.incorrect{background:var(--bad-soft);border-color:var(--bad);color:var(--bad)}.question-grid button.current{box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--primary);color:var(--ink)}.question-grid button:disabled{cursor:wait}.question-panel{padding:32px}.question-meta{display:flex;align-items:center;gap:12px;margin-bottom:20px;font-size:.85rem;color:var(--ink-3);text-transform:capitalize}.question-number{margin-bottom:.5rem}.question-prompt{font-size:clamp(1.35rem,1.1rem + 1vw,1.75rem);margin-bottom:.5em}.answer-instruction{color:var(--ink-2);font-size:.9rem;margin-bottom:18px}.answer-list{display:grid;gap:10px}.answer-list:disabled .answer-option{cursor:default}.answer-option{position:relative;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px;padding:14px 16px;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--surface);font-weight:400;line-height:1.45;cursor:pointer;transition:border-color .15s 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