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var(--transition-base);box-shadow:var(--shadow-sm)}.flashcards-arrow:hover:not(:disabled){background:var(--bg-secondary);border-color:var(--border-color-dark);box-shadow:var(--shadow-md)}.flashcards-arrow:disabled{opacity:.3;cursor:not-allowed}.flashcards-viewport{flex:1;perspective:800px;min-height:240px;display:flex;align-items:center;justify-content:center;user-select:none;-webkit-user-select:none}.flashcard{width:100%;max-width:400px;height:230px;position:relative;cursor:pointer;transform-style:preserve-3d;transition:transform .5s ease}.flashcard--flipped{transform:rotateY(180deg)}.flashcard__front,.flashcard__back{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius-xl);background:var(--bg-primary);box-shadow:var(--shadow-md);border:1.5px solid var(--border-color);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px var(--spacing-xl) var(--spacing-lg);gap:var(--spacing-sm);overflow:hidden}.flashcard__back{transform:rotateY(180deg)}.flashcard__label{position:absolute;top:var(--spacing-md);left:var(--spacing-md);font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);text-transform:uppercase;letter-spacing:.06em;padding:3px 10px;border-radius:var(--radius-full);font-family:var(--font-family-base)}.flashcard__label--mistake{background:#fef2f2;color:#dc2626}.flashcard__label--learning{background:#ecfdf5;color:#059669}.flashcard__type{position:absolute;top:var(--spacing-md);right:var(--spacing-md);font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);text-transform:uppercase;letter-spacing:.06em;padding:3px 10px;border-radius:var(--radius-full);font-family:var(--font-family-base)}.flashcard__type--radical{background:#ede9fe;color:#7c3aed}.flashcard__type--character{background:#dbeafe;color:#2563eb}.flashcard__type--word{background:#dcfce7;color:#059669}.flashcard__display{font-size:4rem;font-weight:400;color:var(--text-primary);font-family:KaiTi,楷体,serif;line-height:1.2;flex-shrink:0}.flashcard__display--small{font-size:2.5rem}.flashcard__hint{font-size:var(--font-size-xs);color:var(--text-tertiary);font-family:var(--font-family-base)}.flashcard__pinyin{font-size:var(--font-size-xl);color:var(--text-primary);font-family:var(--font-family-pinyin);font-weight:var(--font-weight-medium);flex-shrink:0}.flashcard__meaning{font-size:var(--font-size-base);color:var(--text-secondary);font-family:var(--font-family-base);text-align:center;line-height:1.5;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;text-overflow:ellipsis;max-width:100%}.flashcards-counter{text-align:center;margin-top:var(--spacing-md);font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:var(--font-weight-medium);font-family:var(--font-family-base)}.modal-overlay{position:fixed;inset:0;background:#0f172a80;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:var(--spacing-lg)}.modal-content{background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:0 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0;margin:0;line-height:1.5}.modal-body{padding:var(--spacing-xl);display:flex;flex-direction:column;gap:var(--spacing-xl)}.modal-checkbox{display:flex;align-items:center;gap:var(--spacing-md);cursor:pointer;-webkit-user-select:none;user-select:none}.modal-checkbox input[type=checkbox]{display:none}.modal-checkbox__mark{width:22px;height:22px;border:2px solid var(--border-color);border-radius:var(--radius-md);background:var(--bg-primary);flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:all var(--transition-base)}.modal-checkbox input:checked+.modal-checkbox__mark{background:#7c3aed;border-color:#7c3aed}.modal-checkbox input:checked+.modal-checkbox__mark:after{content:"✓";color:#fff;font-size:var(--font-size-sm);font-weight:var(--font-weight-bold);line-height:1}.modal-checkbox__label{font-size:var(--font-size-base);font-weight:var(--font-weight-medium);color:var(--text-primary)}.modal-field{display:flex;flex-direction:column;gap:var(--spacing-sm)}.modal-field__label{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.modal-tags{display:flex;flex-wrap:wrap;gap:var(--spacing-xs)}.modal-tag{padding:6px 14px;border:1.5px solid var(--border-color);border-radius:var(--radius-full);background:var(--bg-primary);color:var(--text-secondary);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);font-family:var(--font-family-base);cursor:pointer;transition:all var(--transition-base)}.modal-tag:hover{border-color:#c4b5fd;color:#7c3aed;background:#f5f3ff}.modal-tag--active{background:#7c3aed;border-color:#7c3aed;color:#fff}.modal-tag--active:hover{background:#6d28d9;border-color:#6d28d9;color:#fff}.modal-footer{padding:0 var(--spacing-xl) var(--spacing-xl)}.modal-start-btn{width:100%;padding:14px;background:linear-gradient(135deg,#7c3aed,#6d28d9);border:none;color:#fff;font-size:var(--font-size-base);font-family:var(--font-family-base);font-weight:var(--font-weight-semibold);cursor:pointer;transition:all .3s ease;border-radius:var(--radius-lg);box-shadow:0 4px 12px #7c3aed40}.modal-start-btn:hover:not(:disabled){background:linear-gradient(135deg,#8b5cf6,#7c3aed);transform:translateY(-1px);box-shadow:0 6px 16px #7c3aed59}.modal-start-btn:disabled{opacity:.4;cursor:not-allowed}@media(max-width:768px){.home-page{padding:var(--spacing-md) var(--spacing-md)}.home-tabs{gap:2px;padding:4px;margin-bottom:var(--spacing-xl)}.home-tabs__btn{padding:var(--spacing-sm) var(--spacing-xs);font-size:var(--font-size-sm);flex-direction:column;gap:2px}.home-tabs__icon svg{width:18px;height:18px}.action-buttons{grid-template-columns:1fr 1fr;gap:var(--spacing-md)}.action-buttons--single{grid-template-columns:1fr}.action-btn{min-height:100px;flex-direction:row;gap:var(--spacing-md);padding:var(--spacing-lg)}.action-btn__icon{font-size:2rem;margin-bottom:0}.action-btn__label{font-size:var(--font-size-lg)}.action-btn__desc{display:none}.review-section{grid-template-columns:1fr}.streak-card{flex-direction:row;gap:var(--spacing-md);padding:var(--spacing-lg);min-width:unset}.streak__flame{font-size:2rem;margin-bottom:0}.streak__count{font-size:var(--font-size-3xl);margin-bottom:0}.timeline__dot{width:28px;height:28px}.timeline__line{top:14px;left:calc(var(--spacing-sm) + 14px);right:calc(var(--spacing-sm) + 14px)}.stats-grid{grid-template-columns:1fr;gap:var(--spacing-md)}.stat-card{display:flex;align-items:center;gap:var(--spacing-md);text-align:left;padding:var(--spacing-lg)}.stat-card__icon{position:static;opacity:.2;font-size:2.5rem;order:-1}.stat-card__value{font-size:var(--font-size-3xl);margin-bottom:0}.hsk-card{flex:0 0 140px}.averages-grid{grid-template-columns:repeat(3,1fr);gap:var(--spacing-sm)}.avg-card{padding:var(--spacing-md)}.avg-gauge{width:90px;height:53px}.avg-gauge__value{font-size:18px}.learning-graph__chart-wrapper{height:220px}.history-table th,.history-table td{padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-sm)}.flashcard{height:220px}.flashcard__front,.flashcard__back{padding:36px var(--spacing-md) var(--spacing-md)}.flashcard__display{font-size:3rem}.flashcard__display--small{font-size:1.75rem}.flashcard__pinyin{font-size:var(--font-size-lg)}.flashcard__meaning{font-size:var(--font-size-sm);-webkit-line-clamp:2}.flashcards-arrow{width:36px;height:36px;font-size:1.5rem}}@media(max-width:480px){.home-title{font-size:var(--font-size-3xl)}.timeline{padding:0}.timeline__dot{width:24px;height:24px}.timeline__check{font-size:var(--font-size-xs)}.timeline__line{top:12px;left:12px;right:12px}.hsk-card{flex:0 0 130px}.flashcard__front,.flashcard__back{padding:32px var(--spacing-sm) var(--spacing-sm);gap:4px}.flashcard__label,.flashcard__type{font-size:.625rem;padding:2px 7px}.flashcard__display{font-size:2.5rem}.flashcard__display--small{font-size:1.5rem}.flashcard__pinyin{font-size:var(--font-size-base)}.flashcard__meaning{font-size:var(--font-size-xs)}}.reading-tab{min-height:300px}.generate-btn{width:100%;display:flex;align-items:center;gap:var(--spacing-lg);padding:var(--spacing-lg) var(--spacing-xl);margin-bottom:var(--spacing-2xl);background:linear-gradient(135deg,#059669,#047857);color:#fff;border:none;border-radius:var(--radius-xl);cursor:pointer;transition:all var(--transition-base);box-shadow:var(--shadow-md);text-align:left}.generate-btn:hover{background:linear-gradient(135deg,#10b981,#059669);transform:translateY(-2px);box-shadow:var(--shadow-lg)}.generate-btn:active{transform:translateY(0);box-shadow:var(--shadow-md)}.generate-btn__icon{display:flex;align-items:center;justify-content:center;width:44px;height:44px;flex-shrink:0;background:#fff3;border-radius:var(--radius-lg);font-size:1.4rem;line-height:1}.generate-btn__text{flex:1;display:flex;flex-direction:column;gap:2px}.generate-btn__label{font-size:var(--font-size-lg);font-weight:var(--font-weight-bold);font-family:var(--font-family-base);line-height:1.2}.generate-btn__desc{font-size:var(--font-size-sm);opacity:.85;font-family:var(--font-family-base);line-height:1.3}.generate-btn__arrow{font-size:1.25rem;opacity:.7;flex-shrink:0;transition:transform var(--transition-base),opacity var(--transition-base)}.generate-btn:hover .generate-btn__arrow{transform:translate(3px);opacity:1}.reading-explore{margin-top:var(--spacing-lg)}.reading-explore__header{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-md);margin-bottom:var(--spacing-lg)}.reading-explore__title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);color:var(--text-primary);margin:0;white-space:nowrap}.reading-filters{display:flex;align-items:center;gap:var(--spacing-xl)}.reading-filter{display:flex;align-items:center;gap:var(--spacing-sm)}.reading-filter__label{font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em;white-space:nowrap}.reading-filter__tags{display:flex;gap:4px}.reading-filter__tag{padding:4px 10px;font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);font-family:var(--font-family-base);color:var(--text-secondary);background:var(--bg-primary);border:1.5px solid var(--border-color);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;line-height:1.4}.reading-filter__tag:hover:not(.reading-filter__tag--active){border-color:var(--border-color-dark);color:var(--text-primary)}.reading-filter__tag--active{background:linear-gradient(135deg,#2563eb,#1e40af);color:#fff;border-color:transparent;box-shadow:0 1px 3px #2563eb40}.story-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.story-grid--empty{grid-template-columns:1fr}.story-empty{text-align:center;padding:var(--spacing-3xl) var(--spacing-xl);color:var(--text-secondary);font-size:var(--font-size-base)}.story-card{background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);border:1.5px solid var(--border-color);padding:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-sm);transition:all var(--transition-base);cursor:default}.story-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.story-card__top{display:flex;align-items:center;gap:6px}.story-card__badge{display:inline-flex;align-items:center;gap:4px;font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);text-transform:uppercase;letter-spacing:.05em;padding:3px 10px;border-radius:var(--radius-full);background:linear-gradient(135deg,#2563eb,#1e40af);color:#fff}.story-card__badge--hsk-1{background:linear-gradient(135deg,#10b981,#059669)}.story-card__badge--hsk-2{background:linear-gradient(135deg,#3b82f6,#2563eb)}.story-card__badge--hsk-3{background:linear-gradient(135deg,#8b5cf6,#7c3aed)}.story-card__badge--hsk-4{background:linear-gradient(135deg,#f43f5e,#e11d48)}.story-card__length{display:inline-flex;align-items:center;font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);text-transform:uppercase;letter-spacing:.05em;padding:3px 10px;border-radius:var(--radius-full);color:#fff;background:var(--text-tertiary)}.story-card__length--short{background:linear-gradient(135deg,#10b981,#059669)}.story-card__length--medium{background:linear-gradient(135deg,#f59e0b,#d97706)}.story-card__length--long{background:linear-gradient(135deg,#ef4444,#dc2626)}.story-card__title{font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);color:var(--text-primary);margin:0;line-height:var(--line-height-tight);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.5em}.story-card__stats{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-sm) 0}.story-card__stat{display:inline-flex;align-items:center;gap:5px;padding:5px 11px;background:var(--bg-secondary, #f1f5f9);border-radius:var(--radius-lg);font-size:var(--font-size-sm)}.story-card__stat-icon{font-size:.8rem;line-height:1}.story-card__stat-icon--score{font-weight:var(--font-weight-bold)}.story-card__stat-icon--time{opacity:.7}.story-card__stat-value{font-weight:var(--font-weight-semibold);color:var(--text-secondary)}.story-card__score--high,.story-card__stat-value.story-card__score--high{color:var(--color-success)}.story-card__score--mid,.story-card__stat-value.story-card__score--mid{color:var(--color-warning)}.story-card__score--low,.story-card__stat-value.story-card__score--low{color:var(--color-error)}.story-card__actions{margin-top:auto;padding-top:var(--spacing-sm)}.story-card__btn{width:100%;padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);font-family:var(--font-family-base);border:none;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-base);text-align:center}.story-card__btn--read{background:linear-gradient(135deg,#2563eb,#1e40af);color:#fff;box-shadow:0 2px 6px #2563eb33}.story-card__btn--read:hover{background:linear-gradient(135deg,#3b82f6,#2563eb);transform:translateY(-1px);box-shadow:0 4px 10px #2563eb4d}.story-card__btn--again{background:var(--bg-tertiary);color:var(--text-primary);border:1.5px solid var(--border-color)}.story-card__btn--again:hover{background:var(--border-color);border-color:var(--border-color-dark)}.reading-pagination{display:flex;align-items:center;justify-content:center;gap:var(--spacing-md);padding:var(--spacing-md) 0}.reading-page{min-height:100vh;width:100%;flex:1;padding:var(--spacing-xl) max(var(--spacing-xl),calc(50% - 420px));box-sizing:border-box;background:linear-gradient(180deg,#f0f4ff,#f1f5f9,#f8fafc)}.reading-page .loading,.reading-page .error{text-align:center;padding:var(--spacing-3xl);font-size:var(--font-size-lg);color:var(--text-secondary)}.reading-page .error{color:var(--color-error)}.reading-back{display:inline-flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);font-family:var(--font-family-base);color:var(--text-secondary);background:var(--bg-primary);border:1.5px solid var(--border-color);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-base);margin-bottom:var(--spacing-lg)}.reading-back:hover{color:var(--text-primary);border-color:var(--border-color-dark);box-shadow:var(--shadow-sm)}.reading-header{margin-bottom:var(--spacing-xl)}.reading-header__title{font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);color:var(--text-primary);margin:0 0 var(--spacing-sm)}.reading-header__meta{display:flex;align-items:center;gap:var(--spacing-md)}.reading-header__badge{display:inline-flex;align-items:center;font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);text-transform:uppercase;letter-spacing:.05em;padding:3px 10px;border-radius:var(--radius-full);background:linear-gradient(135deg,#2563eb,#1e40af);color:#fff}.reading-header__timer{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:var(--font-weight-medium)}.reading-text{background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);border:1.5px solid var(--border-color);padding:var(--spacing-2xl);margin-bottom:var(--spacing-xl);line-height:2.8;font-size:1.4rem}.reading-word{position:relative;display:inline-block;cursor:pointer;border-bottom:2px solid var(--color-primary);padding-bottom:2px;transition:background-color var(--transition-fast);margin:0 .35em}.reading-word:hover{background-color:#2563eb14;border-radius:var(--radius-sm) var(--radius-sm) 0 0}.reading-punct{display:inline;margin:0}.word-tooltip{position:absolute;bottom:calc(100% + 8px);left:50%;transform:translate(-50%);background:var(--bg-dark);color:var(--text-inverse);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);white-space:nowrap;z-index:100;pointer-events:none;box-shadow:var(--shadow-lg);font-size:var(--font-size-sm);line-height:var(--line-height-normal);max-width:90vw}.word-tooltip:after{content:"";position:absolute;top:100%;left:50%;transform:translate(-50%);border:6px solid transparent;border-top-color:var(--bg-dark)}.word-tooltip__sentence{color:#fbbf24;font-style:italic;font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);white-space:nowrap}.word-tooltip__divider{height:1px;background:#ffffff26;margin:4px 0}.word-tooltip__pinyin{font-family:var(--font-family-pinyin);font-weight:var(--font-weight-semibold);color:#93c5fd;margin-bottom:2px}.word-tooltip__meaning{color:#e2e8f0;font-size:var(--font-size-xs)}.word-tooltip__no-def{color:#94a3b8;font-size:var(--font-size-xs);font-style:italic}.reading-questions{background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);border:1.5px solid var(--border-color);padding:var(--spacing-2xl);margin-bottom:var(--spacing-xl)}.reading-questions__title{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold);color:var(--text-primary);margin:0 0 var(--spacing-xl)}.question-item{margin-bottom:var(--spacing-xl)}.question-item:last-child{margin-bottom:0}.question-item__text{font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);color:var(--text-primary);margin:0 0 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