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var(--color-border);border-radius:var(--radius-lg)}.flashcards__filters[data-astro-cid-75af5qct]{display:flex;flex-wrap:wrap;gap:var(--space-4)}.flashcards__filter-group[data-astro-cid-75af5qct]{display:flex;flex-direction:column;gap:var(--space-1)}.flashcards__filter-label[data-astro-cid-75af5qct]{font-size:var(--text-xs);font-weight:500;color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.05em}.flashcards__select[data-astro-cid-75af5qct]{appearance:none;background:var(--color-bg-primary);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:var(--space-2) var(--space-8) var(--space-2) var(--space-3);font-size:var(--text-sm);color:var(--color-text-primary);cursor:pointer;transition:border-color var(--transition-fast);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a95a7' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .5rem center}.flashcards__select[data-astro-cid-75af5qct]:hover{border-color:var(--color-border-hover)}.flashcards__actions[data-astro-cid-75af5qct]{display:flex;gap:var(--space-2)}.flashcards__btn[data-astro-cid-75af5qct]{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);font-size:var(--text-sm);font-weight:500;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-bg-primary);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.flashcards__btn[data-astro-cid-75af5qct]:hover{border-color:var(--color-border-hover);color:var(--color-text-primary);background:var(--color-bg-secondary)}.flashcards__btn--review[data-astro-cid-75af5qct]{border-color:#e67e22;color:#e67e22}.flashcards__btn--review[data-astro-cid-75af5qct]:hover{background:#e67e221a}.flashcards__btn--review[data-astro-cid-75af5qct].flashcards__btn--active{background:#e67e22;color:#fff;border-color:#e67e22}.flashcards__btn--mastered[data-astro-cid-75af5qct]{border-color:#34a853;color:#34a853}.flashcards__btn--mastered[data-astro-cid-75af5qct]:hover{background:#34a8531a}.flashcards__btn--mastered[data-astro-cid-75af5qct].flashcards__btn--active{background:#34a853;color:#fff;border-color:#34a853}.flashcards__display[data-astro-cid-75af5qct]{display:flex;align-items:center;justify-content:center;gap:var(--space-4);margin-bottom:var(--space-4)}.flashcards__nav-btn[data-astro-cid-75af5qct]{display:flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:var(--radius-full);border:1px solid var(--color-border);background:var(--color-bg-secondary);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast);flex-shrink:0}.flashcards__nav-btn[data-astro-cid-75af5qct]:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-primary);background:rgba(var(--color-primary-rgb),.08)}.flashcards__nav-btn[data-astro-cid-75af5qct]:disabled{opacity:.3;cursor:not-allowed}.flashcard[data-astro-cid-75af5qct]{perspective:1200px;width:100%;max-width:40rem;min-height:20rem;cursor:pointer;outline:none}.flashcard[data-astro-cid-75af5qct]:focus-visible .flashcard__inner[data-astro-cid-75af5qct]{box-shadow:0 0 0 3px rgba(var(--color-primary-rgb),.3)}.flashcard__inner[data-astro-cid-75af5qct]{position:relative;width:100%;min-height:20rem;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);border-radius:var(--radius-xl)}.flashcard__inner--flipped[data-astro-cid-75af5qct]{transform:rotateY(180deg)}.flashcard__face[data-astro-cid-75af5qct]{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:var(--space-8) var(--space-6);backface-visibility:hidden;border-radius:var(--radius-xl);border:1px solid var(--color-border);background:var(--color-bg-secondary);box-shadow:var(--glass-shadow);overflow-y:auto}.flashcard__face--front[data-astro-cid-75af5qct]{z-index:2}.flashcard__face--back[data-astro-cid-75af5qct]{transform:rotateY(180deg)}.flashcard__category[data-astro-cid-75af5qct]{display:inline-block;font-size:var(--text-xs);font-weight:600;text-transform:uppercase;letter-spacing:.08em;padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);background:color-mix(in srgb,var(--cat-color, #888) 15%,transparent);color:var(--cat-color, #888);margin-bottom:var(--space-4);position:absolute;top:var(--space-4);left:var(--space-4)}.flashcard__difficulty[data-astro-cid-75af5qct]{position:absolute;top:var(--space-4);right:var(--space-4);font-size:var(--text-xs);font-weight:500;padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);background:var(--color-bg-tertiary);color:var(--color-text-tertiary)}.flashcard__difficulty[data-astro-cid-75af5qct][data-difficulty=easy]{background:#34a8531f;color:#34a853}.flashcard__difficulty[data-astro-cid-75af5qct][data-difficulty=medium]{background:#fbbc041f;color:#b88a00}.flashcard__difficulty[data-astro-cid-75af5qct][data-difficulty=hard]{background:#ea43351f;color:#ea4335}.dark[data-astro-cid-75af5qct] .flashcard__difficulty[data-astro-cid-75af5qct][data-difficulty=medium]{color:#fbbc04}.flashcard__question[data-astro-cid-75af5qct]{font-size:var(--text-xl);font-weight:600;color:var(--color-text-primary);text-align:center;line-height:1.6;max-width:32rem}.flashcard__answer[data-astro-cid-75af5qct]{font-size:var(--text-base);color:var(--color-text-primary);text-align:left;line-height:1.8;max-width:34rem;margin-bottom:var(--space-4)}.flashcard__exam-tip[data-astro-cid-75af5qct]{font-size:var(--text-sm);color:var(--color-primary);background:rgba(var(--color-primary-rgb),.08);border:1px solid rgba(var(--color-primary-rgb),.15);border-radius:var(--radius-md);padding:var(--space-3) var(--space-4);max-width:34rem;line-height:1.6;text-align:left}.flashcard__exam-tip[data-astro-cid-75af5qct]:before{content:"考試提示：";font-weight:600;display:block;margin-bottom:var(--space-1)}.flashcard__hint[data-astro-cid-75af5qct]{position:absolute;bottom:var(--space-3);font-size:var(--text-xs);color:var(--color-text-tertiary);opacity:.6}.flashcards__counter[data-astro-cid-75af5qct]{text-align:center;font-size:var(--text-sm);font-weight:500;color:var(--color-text-tertiary);margin-bottom:var(--space-4);font-variant-numeric:tabular-nums}.flashcards__mastery[data-astro-cid-75af5qct]{display:flex;justify-content:center;gap:var(--space-4);margin-bottom:var(--space-8)}.flashcards__shortcuts[data-astro-cid-75af5qct]{display:flex;justify-content:center;flex-wrap:wrap;gap:var(--space-4);margin-bottom:var(--space-16);font-size:var(--text-xs);color:var(--color-text-tertiary)}.flashcards__shortcut-item[data-astro-cid-75af5qct]{display:inline-flex;align-items:center;gap:var(--space-1)}.flashcards__shortcut-item[data-astro-cid-75af5qct] kbd[data-astro-cid-75af5qct]{display:inline-flex;align-items:center;justify-content:center;min-width:1.5rem;height:1.5rem;padding:0 var(--space-1);font-family:var(--font-mono);font-size:.7rem;background:var(--color-bg-tertiary);border:1px solid var(--color-border);border-radius:var(--radius-sm);color:var(--color-text-secondary)}.flashcards__empty[data-astro-cid-75af5qct]{display:flex;flex-direction:column;align-items:center;gap:var(--space-4);padding:var(--space-16) var(--space-4);color:var(--color-text-tertiary);text-align:center}.flashcards__related[data-astro-cid-75af5qct]{border-top:1px solid var(--color-border);padding-top:var(--space-12)}.flashcards__related-title[data-astro-cid-75af5qct]{font-size:var(--text-xl);font-weight:600;color:var(--color-text-primary);margin-bottom:var(--space-6);text-align:center}.flashcards__related-grid[data-astro-cid-75af5qct]{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-4)}.flashcards__related-card[data-astro-cid-75af5qct]{display:flex;flex-direction:column;align-items:flex-start;gap:var(--space-2);padding:var(--space-6);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);text-decoration:none;transition:all var(--transition-base)}.flashcards__related-card[data-astro-cid-75af5qct]:hover{border-color:var(--color-border-hover);box-shadow:var(--glass-shadow-hover);transform:translateY(-2px)}.flashcards__related-icon[data-astro-cid-75af5qct]{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-md);background:rgba(var(--color-primary-rgb),.1);color:var(--color-primary)}.flashcards__related-card-title[data-astro-cid-75af5qct]{font-size:var(--text-base);font-weight:600;color:var(--color-text-primary)}.flashcards__related-card-desc[data-astro-cid-75af5qct]{font-size:var(--text-sm);color:var(--color-text-tertiary)}@media(max-width:640px){.flashcards__controls[data-astro-cid-75af5qct]{flex-direction:column;align-items:stretch}.flashcards__filters[data-astro-cid-75af5qct]{flex-direction:column}.flashcards__actions[data-astro-cid-75af5qct]{justify-content:center}.flashcards__display[data-astro-cid-75af5qct]{gap:var(--space-2)}.flashcards__nav-btn[data-astro-cid-75af5qct]{width:40px;height:40px}.flashcard[data-astro-cid-75af5qct],.flashcard__inner[data-astro-cid-75af5qct]{min-height:18rem}.flashcard__question[data-astro-cid-75af5qct]{font-size:var(--text-lg)}.flashcard__answer[data-astro-cid-75af5qct]{font-size:var(--text-sm)}.flashcards__stats[data-astro-cid-75af5qct]{gap:var(--space-6)}.flashcards__related-grid[data-astro-cid-75af5qct]{grid-template-columns:1fr}.flashcards__shortcuts[data-astro-cid-75af5qct]{display:none}}