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scale(1)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.fade-up{animation:fadeUp .5s ease both}.fade-up-1{animation-delay:.05s}.fade-up-2{animation-delay:.1s}.fade-up-3{animation-delay:.15s}.fade-up-4{animation-delay:.2s}.fade-up-5{animation-delay:.25s}.fade-up-6{animation-delay:.3s}.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--amber);border-radius:50%;animation:spin .8s linear infinite}.spinner-lg{width:40px;height:40px;border-width:3px}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.empty-state-icon{font-size:3rem;margin-bottom:12px}.empty-state-text{font-size:.95rem;margin-bottom:6px;color:var(--text-secondary)}.empty-state-hint{font-size:.82rem}.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--text-secondary);font-size:.82rem;cursor:pointer;margin-bottom:16px;transition:color .2s;background:none;border:none;font-family:var(--font-body);padding:0}.back-link:hover{color:var(--amber)}.notebooks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.kp-stats-bar{display:flex;align-items:center;gap:0;padding:14px 20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:20px}.kp-stats-item{display:flex;align-items:baseline;gap:6px;flex:1;justify-content:center}.kp-stats-num{font-size:1.4rem;font-weight:700;font-family:var(--font-mono);color:var(--text-primary)}.kp-stats-label{font-size:.78rem;color:var(--text-muted)}.kp-stats-divider{width:1px;height:28px;background:var(--border);margin:0 8px;flex-shrink:0}.kp-accordion{display:flex;flex-direction:column;gap:8px}.kp-accordion-item{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-card);overflow:hidden;transition:border-color 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.2s}.kp-accordion-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.kp-accordion-name{font-size:.9rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.kp-accordion-count{font-size:.72rem;color:var(--text-muted);font-family:var(--font-mono);flex-shrink:0}.kp-accordion-right{display:flex;align-items:center;gap:10px;flex-shrink:0}.kp-accordion-bar{width:80px;height:4px;background:var(--bg-elevated);border-radius:2px;overflow:hidden}.kp-accordion-bar-fill{height:100%;border-radius:2px;transition:width .6s ease}.kp-accordion-rate{font-size:.75rem;font-weight:600;font-family:var(--font-mono);min-width:32px;text-align:right}.kp-accordion-body{padding:12px 14px;display:flex;flex-direction:column;gap:10px;background:var(--bg-deep);animation:fadeIn .2s ease}.level-filter{display:flex;gap:10px}.level-filter-btn{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:16px 12px;background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:all 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solid var(--border);background:var(--bg-elevated);display:flex;align-items:center;justify-content:center;margin-bottom:12px}.cropper-canvas{display:block;max-width:100%;cursor:crosshair;touch-action:none;user-select:none;-webkit-user-select:none}.cropper-actions{display:flex;gap:10px;flex-wrap:wrap}.image-preview{width:100%;border-radius:var(--radius);background:var(--bg-elevated);min-height:120px;display:flex;align-items:center;justify-content:center;overflow:hidden;border:1px solid var(--border);margin-bottom:20px}.image-preview img{width:100%;max-height:400px;object-fit:contain}@media(max-width:820px){.practice-question-detail,.practice-result-grid{grid-template-columns:1fr}}@media(max-width:640px){.practice-session-toggle,.practice-question-toggle{padding-left:14px;padding-right:14px}.practice-session-meta{display:flex;flex-direction:column;gap:2px}.practice-session-score{margin-left:0}.practice-question-answer-row{flex-direction:column;gap:4px}.practice-option-item{flex-wrap:wrap}.practice-option-tags{width:100%;justify-content:flex-start;margin-left:34px}.practice-question-detail{padding-left:14px;padding-right:14px}}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg-deep);padding:20px;position:relative}.login-card{width:100%;max-width:400px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px 32px 36px;box-shadow:0 8px 32px #0006}.login-logo{text-align:center;margin-bottom:28px}.login-logo-icon{font-size:2.5rem;margin-bottom:10px;color:var(--amber);text-shadow:0 0 20px rgba(245,158,11,.4)}.login-logo h1{font-family:var(--font-display);font-size:1.5rem;font-weight:700;color:var(--text-primary);margin:0 0 6px}.login-logo p{font-size:.82rem;color:var(--text-muted);margin:0}.login-tabs{display:flex;gap:0;margin-bottom:24px;border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--border)}.login-tab{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;padding:10px 0;background:transparent;border:none;color:var(--text-muted);font-size:.85rem;font-family:var(--font-body);cursor:pointer;transition:all .2s}.login-tab.active{background:var(--amber);color:var(--bg-deep);font-weight:600}.login-tab:not(.active):hover{background:var(--bg-hover);color:var(--text-primary)}.login-form{display:flex;flex-direction:column;gap:18px}.login-field 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input{padding-right:40px}.login-eye-btn{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;display:flex;align-items:center}.login-eye-btn:hover{color:var(--text-primary)}.login-submit{margin-top:6px;padding:12px 0;font-size:.95rem;letter-spacing:.08em;width:100%;justify-content:center;text-align:center}.sidebar-user{display:flex;align-items:center;gap:8px;padding:10px 12px;margin-top:8px;border-top:1px solid 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cubic-bezier(.4,0,.2,1);overflow-y:auto}.sidebar.open{transform:translate(0)}.sidebar:after{display:none}.sidebar-close-btn{display:flex}.sidebar-overlay{display:block;position:fixed;inset:0;background:#0000008c;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:199;animation:fadeIn .25s ease}.mobile-menu-btn{display:flex}.topbar{padding:0 14px;gap:10px}.topbar-search,.search-container{display:none!important}.mobile-search-btn{display:flex!important}.mobile-search-overlay{position:fixed;inset:0;z-index:500;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);animation:fadeIn .15s ease}.mobile-search-panel{background:var(--bg-card);border-bottom:1px solid var(--border);padding:12px 14px;padding-top:max(env(safe-area-inset-top),12px)}.mobile-search-bar{display:flex;align-items:center;gap:8px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 12px}.mobile-search-bar input{flex:1;background:none;border:none;outline:none;color:var(--text-primary);font-size:.9rem;font-family:var(--font-body)}.mobile-search-cancel{background:none;border:none;color:var(--amber);font-size:.85rem;font-weight:500;cursor:pointer;padding:4px 6px;flex-shrink:0}.mobile-search-results{max-height:60vh;overflow-y:auto;margin-top:8px}.topbar-title{font-size:.9rem;flex:1}.main-area{min-height:calc(100vh - 60px)}.content-area{padding:16px 16px 80px}.mobile-bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;height:60px;background:var(--bg-card);border-top:1px solid var(--border);z-index:100;padding:0;padding-bottom:env(safe-area-inset-bottom,0)}.mobile-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;background:none;border:none;color:var(--text-muted);font-size:.65rem;font-family:var(--font-body);cursor:pointer;transition:color 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.question-meta{flex-direction:row;justify-content:space-between;align-items:center}.level-filter{display:grid;grid-template-columns:1fr 1fr;gap:8px}.level-filter-btn{padding:12px 8px}.level-filter-num{font-size:1.2rem}.kp-stats-bar{flex-wrap:wrap;gap:8px;padding:12px 16px}.kp-stats-divider{display:none}.kp-stats-item{min-width:80px}.kp-accordion-header{padding:12px 14px;gap:8px}.kp-accordion-bar{width:50px}.kp-accordion-body{padding:8px 10px}.action-btn-group{flex-wrap:wrap}.image-preview img{max-height:300px}.empty-state{padding:40px 16px}.feedback-block{padding:14px}.upload-container,.practice-container,.question-detail-container{max-width:100%!important}.question-timeline-card>div:first-child{width:60px!important;height:60px!important}}@media(max-width:360px){html{font-size:13px}.content-area{padding:12px 12px 76px}.topbar{height:48px}.mobile-bottom-nav{height:54px}}.flashcard-overlay{position:fixed;inset:0;z-index:1000;background:#000000d1;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:flex;align-items:center;justify-content:center;padding:16px;animation:fadeIn .2s ease}.flashcard-modal{width:100%;max-width:520px;background:var(--bg-card);border-radius:var(--radius);padding:28px;position:relative;box-shadow:var(--shadow-lg);border:1px solid var(--border)}.flashcard-close{position:absolute;top:12px;right:12px;background:none;border:none;color:var(--text-muted);cursor:pointer;padding:6px;border-radius:50%;transition:all .15s;z-index:2}.flashcard-close:hover{background:var(--bg-hover);color:var(--text-primary)}.flashcard-loading{display:flex;flex-direction:column;align-items:center;gap:16px;padding:60px 20px;color:var(--text-muted);font-size:.9rem}.flashcard-progress{display:flex;align-items:center;gap:12px;margin-bottom:20px}.flashcard-progress-bar{flex:1;height:4px;background:var(--bg-hover);border-radius:2px;overflow:hidden}.flashcard-progress-fill{height:100%;background:var(--amber);border-radius:2px;transition:width .3s ease}.flashcard-progress-text{font-size:.75rem;color:var(--text-muted);font-family:var(--font-mono);white-space:nowrap}.flashcard-scene{perspective:800px;cursor:pointer;margin-bottom:20px}.flashcard-card{width:100%;height:300px;position:relative;transition:transform .5s ease;transform-style:preserve-3d}.flashcard-card.is-flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius-sm);padding:24px;display:flex;flex-direction:column;border:1px solid var(--border);overflow-y:auto}.flashcard-front{background:var(--bg-elevated)}.flashcard-back{background:var(--bg-elevated);transform:rotateY(180deg)}.flashcard-type-badge{display:inline-flex;align-items:center;gap:4px;font-size:.72rem;font-weight:600;padding:3px 10px;border-radius:12px;width:fit-content;margin-bottom:16px}.flashcard-face-content{flex:1;font-size:.88rem;line-height:1.7;color:var(--text-primary)}.flashcard-flip-hint{text-align:center;font-size:.72rem;color:var(--text-muted);margin-top:12px;opacity:.7}.flashcard-controls{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:14px}.flashcard-nav-btn{width:42px!important;height:42px!important;padding:0!important;display:flex!important;align-items:center;justify-content:center;border-radius:50%!important;flex-shrink:0}.flashcard-mastery-btn{padding:8px 18px!important;font-size:.8rem!important;border-radius:20px!important}.flashcard-mastered{background:#34d39926!important;border-color:#34d399!important;color:#34d399!important}.flashcard-dots{display:flex;align-items:center;justify-content:center;gap:6px}.flashcard-dot{width:8px;height:8px;border-radius:50%;border:none;background:var(--bg-hover);cursor:pointer;padding:0;transition:all .2s}.flashcard-dot.active{background:var(--amber);transform:scale(1.3)}.flashcard-dot.mastered{background:#34d399}.flashcard-summary-content{text-align:center;padding:30px 0 10px}.flashcard-summary-emoji{font-size:3rem;margin-bottom:8px}.flashcard-summary-content h3{font-size:1.2rem;font-family:var(--font-display);margin-bottom:24px}.flashcard-summary-stats{display:flex;justify-content:center;gap:36px;margin-bottom:28px}.flashcard-stat{display:flex;flex-direction:column;align-items:center;gap:4px}.flashcard-stat-num{font-size:1.8rem;font-weight:700;font-family:var(--font-display)}.flashcard-stat-label{font-size:.75rem;color:var(--text-muted)}.flashcard-summary-actions{display:flex;justify-content:center;gap:12px}.move-overlay{position:fixed;inset:0;z-index:1000;background:#000000bf;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;padding:16px;animation:fadeIn .2s ease}.move-modal{width:100%;max-width:420px;background:var(--bg-card);border-radius:var(--radius);padding:24px;position:relative;box-shadow:var(--shadow-lg);border:1px solid var(--border)}.move-close{position:absolute;top:12px;right:12px;background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;border-radius:50%;transition:all .15s}.move-close:hover{background:var(--bg-hover);color:var(--text-primary)}.move-title{display:flex;align-items:center;gap:8px;font-size:.95rem;font-weight:600;margin-bottom:18px}.move-empty{text-align:center;color:var(--text-muted);padding:30px 0;font-size:.85rem}.move-list{display:flex;flex-direction:column;gap:6px;max-height:280px;overflow-y:auto;margin-bottom:18px}.move-item{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all .15s ease;text-align:left;width:100%;font:inherit;color:inherit}.move-item:hover{border-color:var(--amber-dim)}.move-item.selected{border-color:var(--amber);background:var(--amber-glow)}.move-item-name{font-size:.88rem;font-weight:500}.move-item-meta{font-size:.72rem;color:var(--text-muted)}.move-actions{display:flex;justify-content:flex-end;gap:10px}