.ss-study-page{max-width:760px}.ss-study-page__head{display:flex;flex-direction:column;gap:12px;margin-bottom:28px}.ss-study-page__title{margin:0}.ss-study-page__switch{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}.ss-study{display:flex;flex-direction:column;gap:16px}.ss-study kbd{display:inline-block;min-width:1.6em;padding:1px 5px;border:1px solid var(--border-strong);border-bottom-width:2px;border-radius:var(--radius-xs);background:var(--surface-raised);color:var(--text-muted);font:var(--fw-medium) 11px/1.4 var(--font-mono);text-align:center}.ss-study code{padding:1px 5px;border-radius:var(--radius-xs);background:var(--bg-subtle);color:var(--text-strong);font-family:var(--font-mono);font-size:.88em}.ss-study-keys{margin:0;color:var(--text-faint);font-size:var(--fs-xs);line-height:2}@media (hover: none){.ss-study-keys{display:none}}.ss-study-progress{display:flex;flex-direction:column;gap:8px}.ss-study-progress__bar{display:flex;height:6px;overflow:hidden;border-radius:var(--radius-full);background:var(--bg-subtle)}.ss-study-progress__bar span{flex-basis:0;transition:flex-grow var(--duration-slow) var(--ease-standard)}.ss-study-progress__legend{display:flex;flex-wrap:wrap;gap:4px 16px;margin:0;color:var(--text-muted);font:var(--fs-xs)/1.4 var(--font-mono)}.ss-study-progress__legend span{display:inline-flex;align-items:center;gap:6px}.ss-study-progress__legend i{display:inline-block;width:8px;height:8px;border-radius:50%}.ss-study .is-known{background:var(--status-success-solid)}.ss-study .is-learning{background:var(--accent)}.ss-study .is-unseen{background:var(--border-strong)}.ss-study-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px}.ss-study-toolbar__end{display:inline-flex;gap:4px;margin-left:auto}.ss-study .ss-kicker{display:flex;align-items:center;gap:8px;margin:0}.ss-study-chip{padding:2px 8px;border-radius:var(--radius-full);color:var(--text-inverse);font-size:10px}.ss-study-chip.is-known{background:var(--status-success-solid)}.ss-study-chip.is-learning{background:var(--accent-solid)}[data-theme=dark] .ss-study-chip{color:var(--stone-950)}.ss-flashcard{display:block;width:100%;padding:0;border:0;background:none;color:inherit;font:inherit;text-align:center;cursor:pointer;perspective:1400px;touch-action:pan-y;-webkit-tap-highlight-color:transparent}.ss-flashcard:focus-visible{outline:none}.ss-flashcard:focus-visible .ss-flashcard__face{box-shadow:var(--shadow-focus)}.ss-flashcard__inner{display:grid;transform-style:preserve-3d;transition:transform .52s cubic-bezier(.2,.7,.2,1)}.ss-flashcard.is-flipped .ss-flashcard__inner{transform:rotateY(180deg)}.ss-flashcard__face{grid-area:1 / 1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;min-height:clamp(260px,42vh,380px);padding:32px clamp(20px,5vw,48px);border:1px solid var(--border-strong);border-radius:var(--radius-lg);background:var(--surface-raised);backface-visibility:hidden;-webkit-backface-visibility:hidden;transition:border-color var(--duration-base)}.ss-flashcard:hover .ss-flashcard__face{border-color:var(--border-ink)}.ss-flashcard__face--back{transform:rotateY(180deg);background:var(--accent-soft);border-color:var(--accent-border)}.ss-flashcard__text{color:var(--text-strong);font-family:var(--font-display);font-weight:var(--fw-display);font-size:clamp(20px,3.2vw,28px);line-height:1.3;letter-spacing:-.015em;text-wrap:balance}.ss-flashcard__text--answer{font-family:var(--font-body);font-weight:var(--fw-regular);font-size:clamp(17px,2.4vw,21px);line-height:1.5;letter-spacing:0;color:var(--text-body)}.ss-flashcard__hint{color:var(--text-faint);font:var(--fs-xs)/1.4 var(--font-mono)}@media (prefers-reduced-motion: reduce){.ss-flashcard__inner{transition:none}.ss-flashcard.is-flipped .ss-flashcard__inner,.ss-flashcard__face--back{transform:none}.ss-flashcard .ss-flashcard__face--back,.ss-flashcard.is-flipped .ss-flashcard__face--front{visibility:hidden}.ss-flashcard.is-flipped .ss-flashcard__face--back{visibility:visible}}.ss-study-nav,.ss-study-rate,.ss-study-actions{display:flex;flex-wrap:wrap;gap:8px}.ss-study-nav{justify-content:space-between}.ss-study-nav--end{justify-content:flex-end;min-height:36px}.ss-study-rate{display:grid;grid-template-columns:1fr 1fr}.ss-study-rate[hidden],.ss-study-nav[hidden]{display:none}.ss-study-rate kbd{margin-left:4px}.ss-study-rate .ss-btn--primary kbd{background:transparent;color:inherit;border-color:currentColor;opacity:.7}@media (max-width: 520px){.ss-study-nav .ss-btn{flex:1 1 auto}.ss-study-nav .ss-btn--primary{order:-1;flex-basis:100%}}.ss-study-done{display:flex;flex-direction:column;align-items:flex-start;gap:12px;padding:clamp(20px,4vw,32px);border:1px solid var(--border-strong);border-radius:var(--radius-lg);background:var(--surface-raised)}.ss-study-done h2,.ss-study-done p{margin:0}.ss-study-done .ss-study-actions{margin-top:8px}.ss-study-best{color:var(--text-muted);font-size:var(--fs-sm)}.ss-study-score{margin:0;color:var(--text-strong);font:var(--fw-display) clamp(48px,9vw,72px)/1 var(--font-display);letter-spacing:-.04em}.ss-study-score span{color:var(--text-faint);font-size:.5em;letter-spacing:-.02em}.ss-study-score:focus{outline:none}.ss-study-steps{display:flex;gap:4px}.ss-study-steps span{flex:1;height:6px;border-radius:var(--radius-full);background:var(--bg-subtle);transition:background-color var(--duration-base)}.ss-study-steps .is-current{background:var(--text-strong)}.ss-study-steps .is-right{background:var(--status-success-solid)}.ss-study-steps .is-wrong{background:var(--status-danger-solid)}.ss-study-question{margin:0;text-wrap:balance}.ss-study-question:focus{outline:none}.ss-study-options{display:flex;flex-direction:column;gap:8px;margin:0;padding:0;list-style:none}.ss-study-option{display:flex;align-items:center;gap:12px;width:100%;min-height:52px;padding:10px 14px;border:1px solid var(--border-strong);border-radius:var(--radius-md);background:var(--surface-raised);color:var(--text-body);font:var(--fs-base)/1.4 var(--font-body);text-align:left;cursor:pointer;transition:border-color var(--duration-fast),background-color var(--duration-fast),opacity var(--duration-base)}.ss-study-option:hover:not(:disabled){border-color:var(--border-ink)}.ss-study-option:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px}.ss-study-option:disabled{cursor:default}.ss-study-option__key{display:inline-grid;place-items:center;flex:none;width:28px;height:28px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);color:var(--text-muted);font:var(--fw-medium) var(--fs-xs)/1 var(--font-mono)}.ss-study-option__text{flex:1}.ss-study-option__mark{flex:none;font:var(--fw-medium) var(--fs-2xs)/1 var(--font-mono);letter-spacing:var(--tracking-caps);text-transform:uppercase}.ss-study-option.is-right{border-color:var(--status-success-solid);background:var(--status-success-bg);color:var(--status-success-fg)}.ss-study-option.is-right .ss-study-option__key{border-color:currentColor;color:inherit}.ss-study-option.is-wrong{border-color:var(--status-danger-solid);background:var(--status-danger-bg);color:var(--status-danger-fg)}.ss-study-option.is-wrong .ss-study-option__key{border-color:currentColor;color:inherit}.ss-study-option.is-dimmed{opacity:.55}.ss-study-feedback{min-height:0}.ss-study-feedback>div{padding:12px 14px;border-left:3px solid;border-radius:var(--radius-sm);line-height:1.5;animation:ss-study-in var(--duration-slow) var(--ease-out)}.ss-study-feedback .is-right{border-color:var(--status-success-solid);background:var(--status-success-bg);color:var(--text-body)}.ss-study-feedback .is-wrong{border-color:var(--status-danger-solid);background:var(--status-danger-bg);color:var(--text-body)}@keyframes ss-study-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion: reduce){.ss-study-feedback>div{animation:none}}.ss-study-review-title{margin:16px 0 0}.ss-study-review{display:flex;flex-direction:column;margin:0;padding:0;list-style:none;border-top:1px solid var(--border-default)}.ss-study-review li{display:flex;flex-direction:column;gap:4px;padding:14px 0;border-bottom:1px solid var(--border-default)}.ss-study-review p{margin:0}.ss-study-review__q{display:flex;gap:10px;color:var(--text-strong);font-weight:var(--fw-medium)}.ss-study-review__mark{flex:none;width:18px}.is-right>.ss-study-review__q .ss-study-review__mark{color:var(--status-success-solid)}.is-wrong>.ss-study-review__q .ss-study-review__mark{color:var(--status-danger-solid)}.ss-study-review__a,.ss-study-review__why{padding-left:28px;color:var(--text-muted);font-size:var(--fs-sm)}.ss-study-cta{display:flex;flex-direction:column;gap:12px}.ss-study-cta h2,.ss-study-cta p{margin:0}