:root{--green-50:#f3f9ea;--green-100:#e4f1cf;--green-200:#cae8a4;--green-300:#a9d86e;--green-400:#84c648;--green-500:#5cb83a;--green-600:#4a9c2e;--green-700:#3c7d26;--green-800:#2f6120;--green-900:#244a1a;--leaf-vein:#cbe793;--sun:#f4c95d;--bark:#8a6d4b;--color-bg:#f7faf6;--color-surface:#fff;--color-surface-alt:var(--green-50);--color-border:var(--green-200);--diagram-bg:#f1f8f3;--color-primary:var(--green-500);--color-primary-dark:var(--green-700);--color-accent:var(--sun);--color-text:var(--green-900);--color-text-muted:#5b6f63;--color-text-invert:#fff;--color-highlight:var(--green-400);--color-selected:var(--green-600);--font-sans:"DM Sans", system-ui, -apple-system, sans-serif;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--space-6:32px;--space-7:48px;--space-8:64px;--radius-sm:8px;--radius-md:14px;--radius-lg:22px;--radius-pill:999px;--shadow-sm:0 1px 2px #163b2b0f;--shadow-md:0 6px 18px #163b2b14;--shadow-lg:0 16px 40px #163b2b1f;--ring:0 0 0 3px 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.3s}.quiz-timer__fill[data-low=true]{background:linear-gradient(90deg,#e8896f,#d9534f)}.quiz-timer__num{font-variant-numeric:tabular-nums;text-align:right;min-width:36px;color:var(--color-text-muted);font-weight:700}.quiz-timer__num[data-low=true]{color:#d9534f}.quiz__card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:var(--space-6) var(--space-5);text-align:center;margin-bottom:var(--space-4)}.quiz__ask{text-transform:uppercase;letter-spacing:.06em;color:var(--color-primary-dark);margin-bottom:var(--space-3);font-size:.82rem;font-weight:700}.quiz__prompt{color:var(--color-text);font-size:1.15rem;line-height:1.55}.quiz__options{gap:var(--space-3);display:grid}.quiz-option{text-align:left;width:100%;padding:var(--space-4) var(--space-5);color:var(--color-text);background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);font-size:1rem;font-weight:600;transition:transform .15s,box-shadow .15s,border-color .15s,background .15s}.quiz-option:not(:disabled):hover{border-color:var(--color-primary);transform:translateY(-2px);box-shadow:0 8px 18px #5cb83a38}.quiz-option:disabled{cursor:default}.quiz-option--correct{border-color:var(--green-500);background:var(--green-50);color:var(--green-800)}.quiz-option--wrong{color:#9a3a3a;background:#fbeeee;border-color:#d98a8a}.quiz-option--dim{opacity:.55}.quiz__feedback{justify-content:space-between;align-items:center;gap:var(--space-4);margin-top:var(--space-5);flex-wrap:wrap;display:flex}.quiz__verdict{font-weight:700}.quiz__verdict--ok{color:var(--green-600)}.quiz__verdict--no{color:#b5483f}.quiz-result{text-align:center;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:var(--space-8) var(--space-6)}.quiz-result__title{font-size:1.5rem;font-weight:700}.quiz-result__score{color:var(--color-primary);margin:var(--space-4) 0 var(--space-2);font-size:3.4rem;font-weight:700}.quiz-result__score span{color:var(--color-text-muted);font-size:1.6rem}.quiz-result__msg{color:var(--color-text-muted);margin-bottom:var(--space-5)}[data-theme=dark] body{background:radial-gradient(1200px 600px at 80% -10%, #6cc24224, transparent 60%), radial-gradient(900px 500px at -10% 10%, #6cc24217, transparent 55%), var(--color-bg)}[data-theme=dark] .diagram__type,[data-theme=dark] .flashcard__type{color:var(--green-300);background:#6cc2422e}[data-theme=dark] .flashcard__face--back{background:linear-gradient(160deg,#1d2e24,#16241c)}[data-theme=dark] .quiz-option--correct{border-color:var(--green-500);color:var(--green-200);background:#6cc24229}[data-theme=dark] .quiz-option--wrong{color:#efb0ab;background:#d9534f29;border-color:#b5605a}[data-theme=dark] 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.3s}.ps-region.is-active{fill:#b07d12}.process__step{text-align:center;margin-top:var(--space-4);min-height:92px}.process__step-title{color:var(--color-primary-dark);margin-bottom:var(--space-2);font-size:1.2rem;font-weight:700}.process__step-text{color:var(--color-text);font-size:1rem;line-height:1.6}.process__equation{margin-top:var(--space-3);padding:var(--space-2) var(--space-4);border-radius:var(--radius-pill);background:var(--color-surface-alt);border:1px solid var(--color-border);color:var(--color-primary-dark);font-weight:600;display:inline-block}.process__nav{justify-content:center;align-items:center;gap:var(--space-3);margin-top:var(--space-5);display:flex}.process__count{font-variant-numeric:tabular-nums;color:var(--color-text-muted);text-align:center;min-width:84px;font-weight:600}@media (width<=540px){.app{padding:var(--space-5) var(--space-3) var(--space-7)}.brand__name{font-size:1.7rem}.brand__mark{width:32px;height:32px}.theme-toggle{top:var(--space-3);right:var(--space-3);width:40px;height:40px}.search__input{padding-left:46px;font-size:1rem}.switcher,.deck-picker,.study-modes{scrollbar-width:none;justify-content:flex-start;max-width:100%;overflow-x:auto}.switcher::-webkit-scrollbar{display:none}.deck-picker::-webkit-scrollbar{display:none}.study-modes::-webkit-scrollbar{display:none}.switch-btn{padding:var(--space-2) var(--space-4);white-space:nowrap;flex-shrink:0;font-size:.88rem}.process__nav,.quiz__feedback,.flashcard-nav,.toolbar{flex-wrap:wrap}.home-card{padding:var(--space-6) var(--space-4)}.diagram,.process__stage{padding:var(--space-4)}}.mastery{max-width:560px;margin:0 auto var(--space-4)}.mastery__track{border-radius:var(--radius-pill);background:var(--color-border);height:10px;display:flex;overflow:hidden}.mastery__seg{height:100%;transition:width 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