:root{--bg-primary: #faf8f9;--bg-secondary: #ffffff;--bg-tertiary: #f5f3f4;--bg-card: #ffffff;--bg-sidebar: rgba(255, 255, 255, .85);--bg-hover: rgba(0, 0, 0, .04);--bg-active: rgba(255, 139, 37, .1);--text-primary: #1a1a1a;--text-secondary: #6b7280;--text-accent: #ff8b25;--border-color: rgba(0, 0, 0, .08);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 24px;--green: #34c759;--red: #ff3b30;--blue: #007aff;--orange: #ff9500;--accent: #e89316}[data-theme=dark]{--bg-primary: #0a0a0f;--bg-secondary: #141418;--bg-tertiary: #1c1c22;--bg-card: #1c1c22;--bg-sidebar: rgba(28, 28, 34, .92);--bg-hover: rgba(255, 255, 255, .06);--bg-active: rgba(255, 139, 37, .15);--text-primary: #f0f0f0;--text-secondary: #888;--border-color: rgba(255, 255, 255, .08);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--accent: #e89316}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,Segoe UI,Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);overflow:hidden;height:100vh}#root{height:100vh;display:flex}button{cursor:pointer;border:none;background:none;font-family:inherit;color:inherit}input,textarea,select{font-family:inherit;color:var(--text-primary);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);padding:8px 12px;outline:none;transition:border-color .2s}input:focus,textarea:focus,select:focus{border-color:var(--text-accent)}.app-layout{display:flex;width:100%;height:100vh}.sidebar{width:220px;min-width:220px;background:var(--bg-sidebar);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-right:1px solid var(--border-color);display:flex;flex-direction:column;padding:16px 12px;gap:4px;z-index:10;transition:width .22s cubic-bezier(.4,0,.2,1),min-width .22s cubic-bezier(.4,0,.2,1)}.sidebar-collapsed{width:56px;min-width:56px;padding:16px 6px;align-items:center}.sidebar-collapsed .sidebar-logo{display:none}.sidebar-collapse-btn{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:6px;color:var(--text-secondary);background:transparent;cursor:pointer;transition:all .15s;flex-shrink:0}.sidebar-collapse-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-collapsed .nav-item{justify-content:center;padding:10px}.sidebar-collapsed .theme-toggle{justify-content:center}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:12px 8px 20px}.sidebar-logo{font-size:22px;font-weight:800;letter-spacing:-.5px;background:linear-gradient(135deg,#ff8b25,#ffb347);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;white-space:nowrap;overflow:hidden}.sidebar-header-avatar{width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,#ff8b25,#ffb347);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex-shrink:0;border:none;cursor:pointer;transition:opacity .15s,transform .15s}.sidebar-header-avatar:hover{opacity:.85;transform:scale(1.05)}.sidebar-collapsed .sidebar-header{justify-content:center}.sidebar-collapsed .sidebar-header-avatar{width:24px;height:24px;font-size:11px}.sidebar-nav{flex:1;display:flex;flex-direction:column;gap:2px;padding-top:20px}.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-md);font-size:14px;font-weight:500;color:var(--text-secondary);transition:all .15s ease;text-decoration:none}.nav-item:hover{background:var(--bg-hover);color:var(--text-primary);transform:scale(1.02)}.nav-item.active{color:var(--text-accent);font-weight:600;background:var(--bg-active)}.nav-item .nav-icon{font-size:18px;width:24px;text-align:center;display:flex;align-items:center;justify-content:center}.sidebar-footer{display:flex;flex-direction:column;align-items:center;padding:8px;border-top:1px solid var(--border-color);margin-top:8px}.theme-toggle{display:flex;align-items:center;gap:6px;padding:6px 10px;border-radius:var(--radius-sm);font-size:14px;color:var(--text-secondary);transition:all .15s}.theme-toggle:hover{background:var(--bg-hover);color:var(--text-primary)}.main-content{flex:1;overflow-y:auto;padding:24px 32px;background:var(--bg-primary)}.page-title{font-size:36px;font-weight:700;letter-spacing:-.5px;margin-bottom:4px}.page-subtitle{color:var(--text-secondary);font-size:14px;margin-bottom:24px}.card-surface{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:16px;transition:box-shadow .2s}.card-surface:hover{box-shadow:var(--shadow-sm)}.btn-primary{background:var(--text-accent);color:#fff;padding:10px 20px;border-radius:var(--radius-md);font-weight:600;font-size:14px;transition:all .15s}.btn-primary:hover{opacity:.9;transform:translateY(-1px)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);padding:10px 20px;border-radius:var(--radius-md);font-weight:600;font-size:14px;border:1px solid var(--border-color);transition:all .15s}.btn-secondary:hover{background:var(--bg-hover)}.btn-danger{background:var(--red);color:#fff;padding:10px 20px;border-radius:var(--radius-md);font-weight:600;font-size:14px;transition:all .15s}.btn-pill{padding:8px 18px;border-radius:999px;font-size:13px;font-weight:600;background:var(--text-primary);color:var(--bg-primary);transition:all 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6px);right:0;z-index:1000;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:10px;padding:4px;min-width:220px;box-shadow:0 8px 24px #0000002e}.export-popover-item{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;padding:8px 12px;font-size:13px;font-weight:500;color:var(--text-primary);border-radius:6px;border:none;background:none;cursor:pointer;text-align:left;white-space:nowrap}.export-popover-item:hover{background:var(--bg-hover)}.export-popover-submenu{position:relative}.export-popover-parent{cursor:default}.export-popover-sub{display:none;position:absolute;right:calc(100% + 4px);top:-4px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:10px;padding:4px;min-width:180px;box-shadow:0 8px 24px #0000002e}.export-popover-submenu:hover .export-popover-sub{display:block}.deck-detail-panel{position:fixed;top:0;right:0;width:48%;max-width:650px;height:100vh;background:var(--bg-primary);border-left:1px solid var(--border-color);box-shadow:-4px 0 24px #0000001f;transform:translate(calc(100% + 30px));transition:transform .28s cubic-bezier(.4,0,.2,1),visibility .28s;z-index:100;overflow-y:auto;padding:24px 28px;visibility:hidden}.deck-detail-panel.open{transform:translate(0);visibility:visible}.fab-add-card{position:sticky;bottom:24px;float:right;margin-right:0;z-index:100;width:48px;height:48px;border-radius:50%;background:#e89316;color:#fff;font-size:30px;font-weight:300;border:none;cursor:pointer;box-shadow:0 4px 12px #0003;display:flex;align-items:center;justify-content:center;transition:transform .15s,box-shadow .15s;line-height:1;padding:0 0 2px}.fab-add-card:hover{transform:scale(1.1);box-shadow:0 6px 16px #00000040}.deck-detail-header{display:flex;align-items:flex-start;gap:12px;margin-bottom:16px}.deck-detail-close{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:8px;color:var(--text-secondary);background:transparent;cursor:pointer;transition:all .15s;flex-shrink:0;margin-top:2px}.deck-detail-close:hover{background:var(--bg-tertiary);color:var(--text-primary)}.folder-item{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:var(--radius-md);cursor:pointer;transition:all .15s}.folder-item:hover{background:var(--bg-hover)}.folder-icon{font-size:20px}.card-editor-row{display:flex;align-items:flex-start;gap:12px;padding:12px;background:var(--bg-tertiary);border-radius:var(--radius-md);margin-bottom:8px}.card-number{width:32px;height:32px;border-radius:50%;background:var(--text-accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex-shrink:0}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.animate-in{animation:fadeIn .3s ease forwards}.scrollbar-hide::-webkit-scrollbar{display:none}.scrollbar-hide{scrollbar-width:none}.sb-back-btn{display:inline-flex;align-items:center;gap:4px;padding:6px 12px;border-radius:10px;font-weight:600;font-size:14px;background:#8080801f;border:1px solid rgba(128,128,128,.18);margin-bottom:4px}.sb-back-btn:hover{background:#80808033}.sb-breadcrumbs{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-secondary);padding-left:10px;margin-bottom:8px}.sb-breadcrumb-link{cursor:pointer;opacity:.6}.sb-breadcrumb-link:hover{opacity:1;text-decoration:underline}.sb-breadcrumb-sep{opacity:.4}.sb-breadcrumb-current{font-weight:600}.sb-folder-header{display:flex;align-items:center;gap:10px;margin-bottom:12px}.sb-sort-bar{display:flex;align-items:center;gap:8px;padding:4px 0}.sb-sort-btn{padding:4px 12px;border-radius:6px;font-size:12px;font-weight:500;color:var(--text-secondary);background:var(--bg-tertiary)}.sb-sort-btn.active{color:var(--text-accent);background:var(--bg-active);font-weight:600}.sb-list{display:flex;flex-direction:column;gap:2px}.sb-list-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:10px;cursor:pointer;transition:all .15s}.sb-list-item:hover{background:var(--bg-hover)}.sb-item-icon{width:38px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.sb-item-info{flex:1;min-width:0}.sb-item-name{font-weight:600;font-size:15px;display:flex;align-items:center;gap:6px}.sb-star{color:var(--orange);font-size:14px}.sb-item-meta{font-size:12px;color:var(--text-secondary);margin-top:2px}.sb-item-chevron{font-size:20px;color:var(--text-secondary);opacity:.5}.sb-item-actions{display:flex;gap:8px}.sb-action-btn{padding:6px 14px;border-radius:8px;font-size:13px;font-weight:500;background:var(--bg-tertiary);border:1px solid var(--border-color);transition:all .15s}.sb-action-btn:hover{background:var(--bg-hover)}.sb-exam-btn{background:#42699f1a;color:#42699f;border-color:#42699f4d}.sb-exam-btn:hover{background:#42699f33}.sb-export-btn{display:inline-flex;align-items:center;justify-content:center;padding:4px 8px!important;min-width:32px;background:#64646414;border-color:#64646433}.sb-export-btn:hover{background:#6464642e}.sb-suggestions-section{padding:10px 0 8px}.sb-suggestions-label{font-size:13px;font-weight:600;color:var(--text-secondary);opacity:.75;padding-left:4px;display:block;margin-bottom:8px}.sb-suggestions-card{background:var(--card-bg, rgba(128,128,128,.04));border:1px solid var(--border-color, rgba(128,128,128,.08));border-radius:18px;overflow:hidden}.sb-suggestion-row{display:flex;flex-direction:column;gap:8px;padding:14px 16px;width:100%;border:none;background:none;cursor:pointer;text-align:left;color:inherit;font-family:inherit}.sb-suggestion-row:hover{background:var(--hover-bg, 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16px}.sg-card-question{font-size:14px;color:var(--text-primary);line-height:1.5;margin-bottom:6px}.sg-card-num{font-weight:700;color:var(--text-secondary);font-size:13px}.sg-card-choices{display:flex;flex-direction:column;gap:4px;margin-top:6px}.sg-card-choice{display:flex;align-items:flex-start;gap:8px;font-size:13px;color:var(--text-secondary);padding:4px 8px;border-radius:6px}.sg-card-choice.correct{background:#30d1581f;color:#30d158;font-weight:500}.sg-choice-letter{font-weight:600;flex-shrink:0;width:16px}.sg-choice-text{flex:1}.sg-card-answer{margin-top:6px;font-size:13px;color:var(--text-secondary)}.sg-answer-label{font-weight:600}.sg-note-body{padding:4px 0}.sg-markdown{font-size:14px;line-height:1.6;color:var(--text-primary)}.sg-markdown h1{font-size:22px;font-weight:700;margin:24px 0 12px}.sg-markdown h2{font-size:18px;font-weight:600;margin:20px 0 10px;color:#3478f6}.sg-markdown h3{font-size:15px;font-weight:600;margin:16px 0 8px}.sg-markdown p{margin:8px 0}.sg-markdown ul{margin:8px 0;padding-left:22px}.sg-markdown li{margin:4px 0}.sg-markdown strong{color:var(--text-primary)}.sg-generating-overlay{position:absolute;inset:0;background:#0009;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;z-index:100;border-radius:12px}.sg-generating-card{text-align:center;padding:36px}.sg-generating-card .sg-progress-bar-container{width:200px;margin:0 auto 16px}.sg-generating-label{color:#fff;font-size:16px;font-weight:600;margin:0 0 6px}.sg-generating-sub{color:#fff9;font-size:13px;margin:0 0 8px}.sg-generating-pct{color:#5ac8fa;font-size:20px;font-weight:700}.sg-error{color:#ff453a;font-size:13px;margin-top:10px}@media(max-width:768px){.sg-split{flex-direction:column}.sg-sidebar{width:100%;max-height:280px;border-right:none;border-bottom:1px solid var(--border-color)}}