@import"https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap";.app-layout{display:flex;height:100vh;width:100vw;overflow:hidden;background-color:var(--bg);color:var(--text)}.sidebar{display:flex;flex-direction:column;background:var(--surface);border-right:1px solid var(--border);transition:width .4s cubic-bezier(.4,0,.2,1);overflow:hidden;position:relative;z-index:100}.sidebar.open{width:280px}.sidebar.closed{width:80px}.sidebar-header{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 24px}.logo-text{font-weight:700;font-size:20px;background:linear-gradient(90deg,#818cf8,#c084fc);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.02em}.nav-item{display:flex;align-items:center;padding:12px 16px;border-radius:var(--radius-md);margin-bottom:4px;cursor:pointer;transition:var(--transition);color:var(--text-dim);gap:12px}.nav-item:hover{background:var(--surface-hover);color:var(--text);transform:translate(4px)}.nav-item.active{background:var(--primary-glow);border:1px solid var(--border-bright);color:var(--primary);font-weight:600}.sidebar-nav{flex:1;overflow-y:auto;padding:8px 12px;display:flex;flex-direction:column}.nav-section{margin-top:8px}.section-label{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;padding:8px 8px 4px}.course-list{display:flex;flex-direction:column}.sidebar-footer{padding:8px 12px 12px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:2px}.main-content{flex:1;display:flex;flex-direction:column;overflow:hidden}.app-header{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 40px;background:#030712cc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);z-index:90}.header-search{display:flex;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:0 20px;width:440px;height:44px;transition:var(--transition)}.header-search:focus-within{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-glow);width:480px}.search-icon{color:var(--text-muted);margin-right:12px}.header-search input{background:none;border:none;color:var(--text);font-size:15px;width:100%;outline:none}.page-wrapper{flex:1;overflow-y:auto;padding:40px 60px}.mobile-menu-btn,.mobile-bottom-nav,.mobile-drawer,.drawer-overlay{display:none}@media(max-width:768px){.sidebar{display:none!important}.mobile-menu-btn{display:flex}.app-header{padding:0 16px;height:56px}.header-search{display:none}.page-wrapper{padding:16px 16px 80px}.mobile-bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;height:64px;background:var(--surface);border-top:1px solid var(--border);z-index:200;justify-content:space-around;align-items:center;padding-bottom:env(safe-area-inset-bottom)}.bottom-nav-item{display:flex;flex-direction:column;align-items:center;gap:3px;background:none;border:none;color:var(--text-dim);font-size:10px;padding:8px 20px;cursor:pointer;transition:color .2s}.bottom-nav-item.active{color:var(--primary)}.bottom-nav-item:active{opacity:.7}.drawer-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;z-index:299}.mobile-drawer{display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;width:280px;background:var(--surface);border-right:1px solid var(--border);z-index:300;transform:translate(-100%);transition:transform .3s ease;overflow-y:auto}.mobile-drawer.open{transform:translate(0)}.drawer-header{display:flex;align-items:center;justify-content:space-between;padding:20px 16px;border-bottom:1px solid var(--border)}.drawer-nav,.drawer-footer{display:flex;flex-direction:column;padding:8px}.drawer-footer{margin-top:16px;border-top:1px solid var(--border)}.drawer-item{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:10px;cursor:pointer;color:var(--text-dim);font-size:15px;transition:background .15s}.drawer-item:active{background:var(--surface-hover)}.drawer-item.accent{color:var(--primary)}.drawer-item.danger{color:#f87171}.drawer-section-label{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;padding:8px 16px 4px}}.course-card{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:32px;cursor:pointer;overflow:hidden;transition:var(--transition);display:flex;flex-direction:column;gap:20px}.course-card:hover{transform:translateY(-8px) scale(1.01);border-color:var(--primary);box-shadow:0 24px 48px -12px #00000080;background:var(--surface-hover)}.course-icon{font-size:44px;margin-bottom:8px;filter:drop-shadow(0 8px 16px rgba(0,0,0,.3))}.course-name{font-size:22px;font-weight:700;color:var(--text);margin:0;letter-spacing:-.02em}.course-type{font-size:12px;color:var(--text-muted);font-weight:600;text-transform:uppercase;letter-spacing:.1em}.course-stats{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.stat{display:flex;align-items:center;gap:5px;font-size:12px;color:var(--text-dim);font-weight:500}.stat.warning{color:#f59e0b}.progress-container{display:flex;flex-direction:column;gap:8px;margin-top:12px}.progress-info{display:flex;justify-content:space-between;font-size:12px;font-weight:600;color:var(--text-dim)}.progress-bar{height:8px;background:var(--surface-raised);border-radius:4px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),#a78bfa);border-radius:var(--radius-sm);box-shadow:0 0 12px var(--primary-glow)}.card-bg-glow{position:absolute;top:-40px;right:-40px;width:120px;height:120px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--accent, var(--primary)) 20%,transparent),transparent 70%);pointer-events:none}.card-header{display:flex;align-items:flex-start;justify-content:space-between}.card-body{display:flex;flex-direction:column;gap:6px;flex:1}.countdown-chip{display:flex;align-items:center;gap:4px;font-size:11px;font-weight:600;background:var(--surface-raised);border:1px solid var(--border);padding:3px 9px;border-radius:99px;color:var(--text-dim)}.countdown-chip.urgent{color:#ef4444;background:#ef44441a;border-color:#ef444440}.spinner-container{display:flex;justify-content:center;align-items:center;padding:2rem}.spinner-container.full-screen{position:fixed;top:0;left:0;right:0;bottom:0;background:#0006;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:10000;padding:0}.spinner-content{display:flex;flex-direction:column;align-items:center;gap:1rem;background:var(--glass-bg);padding:2rem;border-radius:1.5rem;border:1px solid rgba(255,255,255,.1);box-shadow:0 20px 40px #0006}.spinner-icon{color:var(--primary)}.spinner-message{font-weight:500;color:var(--text-main);font-size:1.1rem}.animate-spin{animation:spin 1s linear infinite}.dashboard-container{max-width:1200px;margin:0 auto}.dashboard-header{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:48px}.greeting{font-size:40px;font-weight:800;margin:0 0 12px;letter-spacing:-.04em;background:linear-gradient(to right,var(--text),var(--text-dim));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.subtitle{color:var(--text-dim);font-size:18px;margin:0;font-weight:400}.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:32px}.empty-dashboard{grid-column:1 / -1;text-align:center;padding:100px 40px;background:var(--surface);border-radius:var(--radius-xl);border:1px solid var(--border);box-shadow:inset 0 0 40px #0003}.add-btn{display:flex;align-items:center;gap:10px;background:var(--primary);color:#fff;border:none;padding:12px 24px;border-radius:var(--radius-md);font-weight:600;cursor:pointer;box-shadow:0 8px 16px var(--primary-glow)}.add-btn:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:0 12px 24px var(--primary-glow)}.dialog-overlay{position:fixed;top:0;left:0;right:0;bottom:0;z-index:10001;display:flex;align-items:center;justify-content:center;padding:1.5rem;animation:fade-in .2s ease-out}.dialog-card{width:100%;max-width:440px;background:var(--glass-heavy-bg);border-radius:1.5rem;border:1px solid rgba(255,255,255,.1);box-shadow:0 25px 50px -12px #00000080;padding:1.5rem;animation:scale-up .3s cubic-bezier(.16,1,.3,1)}.dialog-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:1.25rem}.dialog-icon{padding:.75rem;border-radius:1rem;background:#ffffff0d;color:var(--primary)}.dialog-icon.destructive{background:#ef44441a;color:#ef4444}.close-btn{background:none;border:none;color:var(--text-dim);cursor:pointer;padding:.5rem;border-radius:.75rem;transition:all .2s}.close-btn:hover{background:#ffffff1a;color:var(--text-main)}.dialog-body{margin-bottom:2rem}.dialog-title{font-size:1.5rem;font-weight:700;margin-bottom:.5rem;color:var(--text-main)}.dialog-message{color:var(--text-dim);line-height:1.5;font-size:1rem}.dialog-footer{display:flex;gap:1rem}.confirm-btn-cancel,.confirm-btn-action{flex:1;padding:.875rem;border-radius:.875rem;font-weight:600;font-size:.95rem;cursor:pointer;transition:all .2s;border:none}.confirm-btn-cancel{background:#ffffff0d;color:var(--text-main)}.confirm-btn-cancel:hover{background:#ffffff1a}.confirm-btn-action{background:var(--primary);color:#fff}.confirm-btn-action:hover{opacity:.9;transform:translateY(-1px)}.confirm-btn-action.destructive{background:#ef4444}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes scale-up{0%{transform:scale(.95);opacity:0}to{transform:scale(1);opacity:1}}.files-tab-container{display:flex;flex-direction:column;gap:20px;position:relative;min-height:400px}.files-tab-container.dragging{border-radius:var(--radius-lg)}.drop-overlay{position:absolute;top:0;left:0;right:0;bottom:0;z-index:100;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-lg);pointer-events:none}.drop-content{text-align:center;color:var(--primary)}.drop-content h2{font-size:24px;margin:16px 0 8px}.drop-content p{color:var(--text-dim)}.files-toolbar{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;border-radius:var(--radius-lg);border:1px solid var(--border)}.toolbar-left,.toolbar-right{display:flex;align-items:center;gap:16px}.count-label{font-size:14px;color:var(--text-dim);font-weight:500}.divider{width:1px;height:20px;background:var(--border)}.tool-btn{display:flex;align-items:center;gap:8px;background:none;border:none;color:var(--text-dim);font-size:14px;font-weight:500;cursor:pointer;padding:8px 12px;border-radius:var(--radius-md);transition:var(--transition)}.tool-btn:hover{background:var(--surface-hover);color:var(--text)}.tool-btn.active{background:var(--primary-glow);color:var(--primary)}.add-file-btn{display:flex;align-items:center;gap:8px;background:var(--primary);color:#fff;border:none;padding:10px 20px;border-radius:var(--radius-md);font-weight:600;font-size:14px;cursor:pointer;box-shadow:0 4px 12px var(--primary-glow)}.add-file-btn:hover{background:var(--primary-hover);transform:translateY(-1px)}.upload-progress-area{display:flex;flex-direction:column;gap:8px}.upload-strip{display:flex;align-items:center;gap:12px;padding:10px 16px;border-radius:var(--radius-md);font-size:13px}.upload-name{flex:1;font-weight:500}.upload-status{color:var(--text-dim)}.upload-retry{background:transparent;border:1px solid var(--border-bright);color:var(--text);border-radius:8px;padding:4px 8px;cursor:pointer}.files-display.list{display:flex;flex-direction:column;gap:10px}.file-row{display:flex;align-items:center;padding:14px 20px;border-radius:var(--radius-lg);border:1px solid var(--border);cursor:pointer}.file-row:hover{border-color:var(--border-bright);background:var(--surface-hover);transform:translate(4px)}.file-row.selected{border-color:var(--primary);background:var(--primary-glow)}.row-icon{font-size:28px;margin-right:20px}.row-info{flex:1;min-width:0}.row-name{font-size:15px;font-weight:600;color:var(--text);margin-bottom:6px}.row-tags{display:flex;gap:8px}.tag-badge{font-size:11px;font-weight:600;padding:3px 10px;border-radius:6px}.row-status{margin:0 24px}.status-label{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600}.status-label.processing{color:var(--primary)}.status-label.completed{color:#10b981}.status-label.failed{color:#f43f5e}.proc-badge{background:var(--surface-raised);color:var(--text);border:none;padding:6px 12px;border-radius:6px;font-size:12px;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:6px}.proc-badge:hover{background:var(--primary)}.empty-files{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:80px 40px;background:var(--surface);border-radius:var(--radius-xl);border:2px dashed var(--border);color:var(--text-dim)}.icon-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px;border-radius:4px}.icon-btn:hover{background:var(--surface-raised);color:var(--text)}.pulse{animation:pulse 2s infinite}@keyframes pulse{0%{transform:scale(1);opacity:1}50%{transform:scale(1.1);opacity:.7}to{transform:scale(1);opacity:1}}.spin{animation:spin 2s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.tag-modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.tag-modal{background:var(--surface-raised);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;min-width:320px;max-width:420px;width:90%;display:flex;flex-direction:column;gap:14px}.tag-modal-header{display:flex;align-items:center;justify-content:space-between;font-weight:700;font-size:14px}.tag-modal-filename{font-size:12px;color:var(--text-dim);margin:0;line-height:1.5}.tag-options{display:flex;flex-wrap:wrap;gap:8px}.tag-option{padding:6px 12px;border-radius:99px;border:1px solid var(--border);background:var(--surface-hover);color:var(--text-dim);font-size:12px;font-weight:500;cursor:pointer;transition:var(--transition)}.tag-option:hover{border-color:var(--border-bright);color:var(--text)}.tag-option.active{font-weight:700}.tag-modal-actions{display:flex;gap:8px;justify-content:flex-end}.tag-modal-actions button{padding:8px 16px;border-radius:10px;border:1px solid var(--border);background:var(--surface-hover);color:var(--text);font-size:13px;font-weight:600;cursor:pointer;transition:var(--transition)}.tag-modal-actions .save-btn{background:var(--primary);color:#fff;border-color:var(--primary)}.tag-modal-actions .save-btn:disabled{opacity:.5;cursor:not-allowed}.topic-tree-container{display:flex;flex-direction:column}.topic-list{display:flex;flex-direction:column;gap:8px}.topic-node{display:flex;align-items:center;padding:12px 18px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);gap:16px}.topic-node:hover{background:var(--surface-hover);border-color:var(--border-bright);transform:translate(4px)}.topic-node.expanded{border-bottom-left-radius:0;border-bottom-right-radius:0;background:var(--surface-hover)}.node-icon{display:flex;align-items:center;justify-content:center;width:24px;color:var(--text-dim)}.node-icon .dot{width:6px;height:6px;background:var(--text-muted);border-radius:50%}.node-content{flex:1;display:flex;align-items:center;gap:10px;min-width:0}.node-name{font-size:15px;font-weight:500;color:var(--text)}.completed-icon{color:#10b981}.study-btn{display:flex;align-items:center;gap:6px;background:var(--primary-glow);color:var(--primary);border:none;padding:6px 12px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer}.study-btn:hover{background:var(--primary);color:#fff}.node-children{padding-left:24px;border-left:1px solid var(--border);margin-left:30px;display:flex;flex-direction:column;gap:6px;margin-bottom:12px}.topic-toolbar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-bottom:14px}.toolbar-left,.toolbar-right{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.topic-count-label{font-size:12px;color:var(--text-muted);font-weight:500;margin-right:4px}.selected-count-label{font-size:12px;font-weight:600;color:var(--primary)}.pill-tool{display:inline-flex;align-items:center;gap:4px;padding:5px 12px;font-size:12px;font-weight:600;border-radius:99px;border:1px solid var(--border);background:var(--surface);color:var(--text-dim);cursor:pointer;transition:var(--transition);white-space:nowrap}.pill-tool:hover{background:var(--surface-hover);color:var(--text);border-color:var(--border-bright)}.pill-tool.active{background:#818cf826;color:var(--primary);border-color:#818cf84d}.pill-tool.warning{color:#f59e0b;border-color:#f59e0b4d;background:#f59e0b14}.pill-tool.warning:hover{background:#f59e0b26}.pill-tool.danger{color:#ef4444;border-color:#ef44444d;background:#ef444414}.pill-tool.danger:hover{background:#ef444426}.analyze-btn{padding:7px 16px;font-size:13px;font-weight:600;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;transition:var(--transition);white-space:nowrap}.analyze-btn:hover:not(:disabled){background:var(--primary);color:#fff;border-color:var(--primary)}.analyze-btn:disabled{opacity:.5;cursor:not-allowed}.empty-topics{padding:48px 24px;text-align:center;color:var(--text-dim);display:flex;flex-direction:column;align-items:center;gap:14px}.weak-topics-panel{background:#f59e0b0f;border:1px solid rgba(245,158,11,.2);border-radius:var(--radius-lg);padding:12px 16px;margin-bottom:14px}.weak-panel-title{font-size:12px;font-weight:700;color:#f59e0b;margin-bottom:10px}.weak-chips{display:flex;flex-wrap:wrap;gap:6px}.weak-chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;background:#f59e0b1a;border:1px solid rgba(245,158,11,.25);border-radius:99px;font-size:12px}.weak-chip-name{color:var(--text);font-weight:500}.weak-chip-count{color:#f59e0b;font-weight:600}.weak-chip-dismiss{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:13px;padding:0 2px;line-height:1;transition:color .15s}.weak-chip-dismiss:hover:not(:disabled){color:#ef4444}.weak-chip-dismiss:disabled{opacity:.5;cursor:not-allowed}.topic-node-wrapper{display:flex;flex-direction:column}.topic-node.excluded{opacity:.45}.topic-node.excluded .node-name{text-decoration:line-through;color:var(--text-muted)}.topic-node.has-errors{border-color:#f59e0b59}.topic-node.selected{background:#818cf81a;border-color:#818cf866}.topic-checkbox{width:15px;height:15px;accent-color:var(--primary);cursor:pointer;flex-shrink:0}.error-tag{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:600;color:#f59e0b;background:#f59e0b1f;border:1px solid rgba(245,158,11,.25);padding:2px 8px;border-radius:99px;white-space:nowrap}.dismiss-inline{background:none;border:none;color:inherit;cursor:pointer;font-size:13px;padding:0;line-height:1;opacity:.7;transition:opacity 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auto}.course-detail-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:32px}.header-info{display:flex;align-items:center;gap:24px}.course-icon-large{font-size:56px;background:var(--surface);color:var(--primary);width:96px;height:96px;display:flex;align-items:center;justify-content:center;border-radius:24px;border:1px solid var(--border);box-shadow:0 8px 16px #0003}.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;margin-bottom:8px;color:var(--text-dim)}.crumb-link{cursor:pointer;transition:color .2s}.crumb-link:hover{color:var(--primary)}.crumb-sep{opacity:.5}.course-title{font-size:32px;font-weight:800;margin:0 0 12px;letter-spacing:-.02em}.course-meta{display:flex;gap:12px;align-items:center}.meta-badge{background:var(--surface);border:1px solid var(--border);padding:4px 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36px}.auth-logo{display:flex;align-items:center;gap:10px;margin-bottom:32px}.auth-logo-icon{font-size:28px}.auth-logo-text{font-size:22px;font-weight:800;letter-spacing:-.02em}.auth-logo-badge{font-size:11px;font-weight:700;background:var(--primary);color:#fff;padding:2px 7px;border-radius:6px;margin-left:4px;letter-spacing:.05em}.auth-title{font-size:24px;font-weight:800;margin:0 0 6px;letter-spacing:-.02em}.auth-desc{color:var(--text-dim);font-size:14px;line-height:1.5;margin:0 0 24px}.auth-form{display:flex;flex-direction:column;gap:16px;margin-top:24px}.auth-form label{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:600;color:var(--text-dim)}.auth-form input{width:100%;padding:11px 14px;background:var(--surface-hover);border:1px solid var(--border);border-radius:10px;color:var(--text);font-size:15px;outline:none;transition:border-color .15s;box-sizing:border-box}.auth-form input:focus{border-color:var(--primary)}.auth-form 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#f9fafb;--text-dim: #9ca3af;--text-muted: #6b7280;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--glass: rgba(17, 24, 39, .7);--glass-border: rgba(255, 255, 255, .1);--transition: all .2s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box}body{margin:0;padding:0;font-family:Outfit,-apple-system,sans-serif;background-color:var(--bg);background-image:radial-gradient(at 0% 0%,rgba(99,102,241,.05) 0px,transparent 50%),radial-gradient(at 100% 100%,rgba(139,92,246,.05) 0px,transparent 50%);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100vh;overflow-x:hidden}.glass{background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid 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