@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--font:"Inter", system-ui, -apple-system, sans-serif;--bg-primary:#0f1117;--bg-secondary:#161b27;--bg-tertiary:#1e2536;--bg-card:#1a2133;--bg-hover:#232c41;--bg-input:#1a2133;--border:#ffffff12;--border-focus:#6366f199;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--text-inverse:#0f1117;--accent:#6366f1;--accent-hover:#4f46e5;--accent-light:#6366f126;--accent-glow:#6366f14d;--cyan:#06b6d4;--cyan-light:#06b6d41f;--success:#10b981;--success-light:#10b9811f;--warning:#f59e0b;--warning-light:#f59e0b1f;--error:#ef4444;--error-light:#ef44441f;--shadow-sm:0 1px 3px #0000004d;--shadow-md:0 4px 16px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-accent:0 4px 20px #6366f140;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--sidebar-width:260px;--header-height:64px;--transition:all .2s cubic-bezier(.4, 0, .2, 1)}[data-theme=light]{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--bg-card:#fff;--bg-hover:#f1f5f9;--bg-input:#f8fafc;--border:#00000014;--border-focus:#6366f180;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--text-inverse:#fff;--accent-light:#6366f114;--accent-glow:#6366f126;--cyan-light:#06b6d414;--success-light:#10b98114;--warning-light:#f59e0b14;--error-light:#ef444414;--shadow-sm:0 1px 3px #00000014;--shadow-md:0 4px 16px #0000001a;--shadow-lg:0 8px 32px #0000001f;--shadow-accent:0 4px 20px #6366f126}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh;transition:background .3s,color .3s}a{color:inherit;text-decoration:none}button{font-family:var(--font);cursor:pointer;background:0 0;border:none}input,textarea,select{font-family:var(--font)}img{max-width:100%;display:block}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.app-layout{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);z-index:100;transition:var(--transition);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0;overflow:hidden}.sidebar.collapsed{width:68px}.main-content{margin-left:var(--sidebar-width);flex-direction:column;flex:1;min-height:100vh;transition:margin-left .3s;display:flex}.main-content.sidebar-collapsed{margin-left:68px}.sidebar-header{border-bottom:1px solid var(--border);min-height:var(--header-height);align-items:center;gap:10px;padding:20px 16px;display:flex}.sidebar-logo{background:linear-gradient(135deg, var(--accent), var(--cyan));border-radius:var(--radius-sm);width:36px;height:36px;box-shadow:var(--shadow-accent);flex-shrink:0;justify-content:center;align-items:center;display:flex}.sidebar-logo svg{color:#fff;width:20px;height:20px}.sidebar-brand{background:linear-gradient(135deg, var(--accent), var(--cyan));-webkit-text-fill-color:transparent;white-space:nowrap;-webkit-background-clip:text;background-clip:text;font-size:16px;font-weight:700;overflow:hidden}.sidebar-nav{flex-direction:column;flex:1;gap:4px;padding:12px 8px;display:flex;overflow-y:auto}.nav-section-label{letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);white-space:nowrap;padding:8px 12px 4px;font-size:10px;font-weight:600;overflow:hidden}.nav-item{border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:var(--transition);white-space:nowrap;align-items:center;gap:10px;padding:10px 12px;font-size:14px;font-weight:500;display:flex;position:relative;overflow:hidden}.nav-item:hover{background:var(--bg-hover);color:var(--text-primary)}.nav-item.active{background:var(--accent-light);color:var(--accent)}.nav-item.active:before{content:"";background:var(--accent);border-radius:0 2px 2px 0;width:3px;position:absolute;top:8px;bottom:8px;left:0}.nav-item svg{flex-shrink:0;width:18px;height:18px}.nav-item span{text-overflow:ellipsis;overflow:hidden}.sidebar-collapse-btn{border-top:1px solid var(--border);color:var(--text-muted);cursor:pointer;transition:var(--transition);justify-content:center;align-items:center;gap:8px;padding:12px 16px;font-size:13px;font-weight:500;display:flex}.sidebar-collapse-btn:hover{color:var(--text-primary);background:var(--bg-hover)}.page-header{height:var(--header-height);background:var(--bg-secondary);border-bottom:1px solid var(--border);z-index:50;justify-content:space-between;align-items:center;padding:0 24px;display:flex;position:sticky;top:0}.page-header-left{align-items:center;gap:12px;display:flex}.page-title{color:var(--text-primary);font-size:18px;font-weight:700}.page-header-right{align-items:center;gap:12px;display:flex}.page-content{flex:1;width:100%;max-width:1400px;margin:0 auto;padding:28px 32px}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);transition:var(--transition);padding:24px}.card:hover{border-color:var(--border-focus)}.card-glass{-webkit-backdrop-filter:blur(12px);background:#1a2133b3}[data-theme=light] .card-glass{background:#fffc}.stat-cards{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin-bottom:28px;display:grid}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);transition:var(--transition);cursor:default;justify-content:space-between;align-items:flex-start;padding:22px;display:flex}.stat-card:hover{box-shadow:var(--shadow-md);border-color:var(--border-focus);transform:translateY(-2px)}.stat-icon{border-radius:var(--radius-md);flex-shrink:0;justify-content:center;align-items:center;width:48px;height:48px;display:flex}.stat-icon svg{width:22px;height:22px}.stat-icon.indigo{background:var(--accent-light);color:var(--accent)}.stat-icon.cyan{background:var(--cyan-light);color:var(--cyan)}.stat-icon.green{background:var(--success-light);color:var(--success)}.stat-icon.amber{background:var(--warning-light);color:var(--warning)}.stat-info{flex:1}.stat-value{margin-bottom:4px;font-size:28px;font-weight:800;line-height:1}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:12px;font-weight:500}.btn{border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);white-space:nowrap;border:1px solid #0000;justify-content:center;align-items:center;gap:6px;padding:10px 18px;font-size:14px;font-weight:600;display:inline-flex;position:relative;overflow:hidden}.btn:disabled{opacity:.5;cursor:not-allowed}.btn svg{flex-shrink:0;width:16px;height:16px}.btn-primary{background:var(--accent);color:#fff;box-shadow:var(--shadow-accent)}.btn-primary:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 6px 24px #6366f166}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--border)}.btn-secondary:hover:not(:disabled){background:var(--bg-hover)}.btn-danger{background:var(--error-light);color:var(--error);border-color:#ef44444d}.btn-danger:hover:not(:disabled){background:var(--error);color:#fff}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover:not(:disabled){background:var(--bg-hover);color:var(--text-primary)}.btn-icon{border-radius:var(--radius-sm);width:36px;height:36px;padding:0}.btn-sm{padding:7px 14px;font-size:13px}.btn-lg{padding:13px 24px;font-size:15px}.form-group{flex-direction:column;gap:6px;display:flex}.form-label{color:var(--text-secondary);font-size:13px;font-weight:600}.form-input{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);transition:var(--transition);outline:none;width:100%;padding:11px 14px;font-size:14px}.form-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.form-input::placeholder{color:var(--text-muted)}.form-input.error{border-color:var(--error);box-shadow:0 0 0 3px #ef444426}.form-error{color:var(--error);align-items:center;gap:4px;font-size:12px;display:flex}.input-wrapper{align-items:center;display:flex;position:relative}.input-wrapper .form-input{padding-left:40px}.input-icon{color:var(--text-muted);pointer-events:none;position:absolute;left:12px}.input-icon svg{width:16px;height:16px}.input-action{color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:4px;align-items:center;padding:4px;display:flex;position:absolute;right:10px}.input-action:hover{color:var(--text-primary)}.input-action svg{width:16px;height:16px}.search-bar{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);transition:var(--transition);align-items:center;gap:8px;padding:0 12px;display:flex}.search-bar:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.search-bar svg{width:16px;height:16px;color:var(--text-muted);flex-shrink:0}.search-bar input{color:var(--text-primary);background:0 0;border:none;outline:none;flex:1;min-width:0;padding:10px 0;font-size:14px}.search-bar input::placeholder{color:var(--text-muted)}.badge{letter-spacing:.03em;border-radius:999px;align-items:center;gap:4px;padding:3px 9px;font-size:11px;font-weight:600;display:inline-flex}.badge-indigo{background:var(--accent-light);color:var(--accent)}.badge-cyan{background:var(--cyan-light);color:var(--cyan)}.badge-green{background:var(--success-light);color:var(--success)}.badge-amber{background:var(--warning-light);color:var(--warning)}.badge-red{background:var(--error-light);color:var(--error)}.dialog-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#0009;justify-content:center;align-items:center;padding:20px;animation:.15s fadeIn;display:flex;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)scale(.96)}to{opacity:1;transform:translateY(0)scale(1)}}.dialog{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:440px;box-shadow:var(--shadow-lg);padding:28px;animation:.2s cubic-bezier(.34,1.56,.64,1) slideUp}.dialog-icon{border-radius:var(--radius-lg);justify-content:center;align-items:center;width:56px;height:56px;margin:0 auto 16px;display:flex}.dialog-icon svg{width:26px;height:26px}.dialog-icon.success{background:var(--success-light);color:var(--success)}.dialog-icon.warning{background:var(--warning-light);color:var(--warning)}.dialog-icon.error{background:var(--error-light);color:var(--error)}.dialog-icon.info{background:var(--accent-light);color:var(--accent)}.dialog-icon.confirm{background:var(--warning-light);color:var(--warning)}.dialog-title{text-align:center;margin-bottom:8px;font-size:18px;font-weight:700}.dialog-message{color:var(--text-secondary);text-align:center;margin-bottom:24px;font-size:14px;line-height:1.6}.dialog-actions{justify-content:center;gap:10px;display:flex}.dialog-actions .btn{min-width:100px}.toast-container{z-index:2000;pointer-events:none;flex-direction:column-reverse;gap:10px;display:flex;position:fixed;bottom:24px;right:24px}.toast{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);min-width:280px;max-width:380px;box-shadow:var(--shadow-lg);pointer-events:all;cursor:pointer;align-items:center;gap:10px;padding:14px 18px;animation:.25s slideUp;display:flex}.toast-icon svg{width:18px;height:18px}.toast.success .toast-icon{color:var(--success)}.toast.error .toast-icon{color:var(--error)}.toast.warning .toast-icon{color:var(--warning)}.toast.info .toast-icon{color:var(--cyan)}.toast-text{flex:1;font-size:14px;font-weight:500}.toast-close{color:var(--text-muted);padding:2px}.toast-close svg{width:14px;height:14px}.section-accordion{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);transition:var(--transition);overflow:hidden}.section-header{cursor:pointer;transition:var(--transition);justify-content:space-between;align-items:center;padding:14px 18px;display:flex}.section-header:hover{background:var(--bg-hover)}.section-header-left{align-items:center;gap:10px;display:flex}.section-type-dot{border-radius:50%;flex-shrink:0;width:8px;height:8px}.section-name{font-size:14px;font-weight:600}.section-doc-count{color:var(--text-muted);font-size:12px}.section-body{padding:0 18px 14px}.category-item{margin-bottom:12px}.category-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;justify-content:space-between;align-items:center;margin-bottom:6px;font-size:12px;font-weight:600;display:flex}.doc-chips{flex-wrap:wrap;gap:6px;display:flex}.doc-chip{background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:var(--transition);align-items:center;gap:6px;max-width:200px;padding:5px 10px;font-size:12px;display:flex}.doc-chip:hover{background:var(--bg-hover);color:var(--text-primary);border-color:var(--border-focus)}.doc-chip span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.doc-chip svg{flex-shrink:0;width:12px;height:12px}.doc-chip .chip-remove{color:var(--text-muted);margin-left:2px}.doc-chip .chip-remove:hover{color:var(--error)}.doc-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;display:grid}.doc-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);flex-direction:column;gap:12px;padding:18px;display:flex;position:relative;overflow:hidden}.doc-card:before{content:"";background:linear-gradient(90deg, var(--accent), var(--cyan));opacity:0;height:3px;transition:opacity 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24px}.upload-zone:hover,.upload-zone.dragging{border-color:var(--accent);background:var(--accent-light)}.upload-zone-icon{background:var(--accent-light);border-radius:var(--radius-xl);width:64px;height:64px;color:var(--accent);transition:var(--transition);justify-content:center;align-items:center;margin:0 auto 16px;display:flex}.upload-zone:hover .upload-zone-icon,.upload-zone.dragging .upload-zone-icon{transform:scale(1.1)}.upload-zone-icon svg{width:28px;height:28px}.upload-zone h3{margin-bottom:6px;font-size:16px;font-weight:700}.upload-zone p{color:var(--text-muted);font-size:13px}.upload-zone .browse-link{color:var(--accent);font-weight:600}.progress-bar{background:var(--bg-tertiary);border-radius:2px;height:4px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--accent), var(--cyan));border-radius:2px;height:100%;transition:width .3s}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.skeleton{background:linear-gradient(90deg, 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var(--cyan));color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:14px;font-weight:700;display:flex;overflow:hidden}.avatar-sm{width:32px;height:32px;font-size:13px}.avatar-md{width:40px;height:40px;font-size:14px}.avatar-lg{width:56px;height:56px;font-size:18px}.avatar-xl{width:80px;height:80px;font-size:24px}.course-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);cursor:pointer;transition:var(--transition);padding:22px;position:relative;overflow:hidden}.course-card-gradient{opacity:.6;border-radius:0 0 0 80px;width:80px;height:80px;position:absolute;top:0;right:0}.course-card:hover{box-shadow:var(--shadow-md);border-color:var(--border-focus);transform:translateY(-3px)}.course-card-header{justify-content:space-between;align-items:flex-start;margin-bottom:14px;display:flex}.course-icon{border-radius:var(--radius-md);justify-content:center;align-items:center;width:44px;height:44px;font-size:18px;display:flex}.course-name{margin-bottom:4px;font-size:16px;font-weight:700;line-height:1.3}.course-meta{color:var(--text-muted);font-size:12px}.course-actions{opacity:0;gap:4px;transition:opacity .2s;display:flex}.course-card:hover .course-actions{opacity:1}.course-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;display:grid}.quick-actions{flex-wrap:wrap;gap:12px;display:flex}.quick-action-btn{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);text-align:left;min-width:160px;color:var(--text-primary);align-items:center;gap:10px;padding:14px 18px;display:flex}.quick-action-btn:hover{border-color:var(--accent);background:var(--accent-light);transform:translateY(-1px)}.quick-action-icon{border-radius:var(--radius-sm);width:36px;height:36px;color:var(--accent);background:var(--accent-light);flex-shrink:0;justify-content:center;align-items:center;display:flex}.quick-action-icon svg{width:16px;height:16px}.quick-action-label{font-size:13px;font-weight:600}.theme-toggle{border-radius:var(--radius-sm);background:var(--bg-tertiary);border:1px solid var(--border);cursor:pointer;width:36px;height:36px;transition:var(--transition);color:var(--text-secondary);justify-content:center;align-items:center;display:flex}.theme-toggle:hover{background:var(--bg-hover);color:var(--text-primary)}.theme-toggle svg{width:16px;height:16px}.dropdown{position:relative}.dropdown-menu{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);min-width:160px;box-shadow:var(--shadow-lg);z-index:200;padding:6px;animation:.15s slideUp;position:absolute;top:calc(100% + 6px);right:0}.dropdown-item{border-radius:var(--radius-sm);cursor:pointer;color:var(--text-secondary);transition:var(--transition);align-items:center;gap:8px;width:100%;padding:9px 12px;font-size:13px;font-weight:500;display:flex}.dropdown-item:hover{background:var(--bg-hover);color:var(--text-primary)}.dropdown-item.danger{color:var(--error)}.dropdown-item.danger:hover{background:var(--error-light)}.dropdown-item svg{width:14px;height:14px}.dropdown-divider{background:var(--border);height:1px;margin:4px 0}.form-select{background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);transition:var(--transition);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748B'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;background-size:16px;outline:none;width:100%;padding:11px 38px 11px 14px;font-size:14px}.form-select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}@keyframes spin{to{transform:rotate(360deg)}}.spinner{border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;flex-shrink:0;width:20px;height:20px;animation:.6s linear infinite 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var(--border);border-radius:var(--radius-xl);width:100%;max-width:440px;box-shadow:var(--shadow-lg);z-index:1;padding:40px;position:relative}.auth-logo{background:linear-gradient(135deg, var(--accent), var(--cyan));border-radius:var(--radius-lg);width:52px;height:52px;box-shadow:var(--shadow-accent);justify-content:center;align-items:center;margin:0 auto 20px;display:flex}.auth-logo svg{color:#fff;width:26px;height:26px}.auth-title{text-align:center;margin-bottom:6px;font-size:24px;font-weight:800}.auth-subtitle{color:var(--text-muted);text-align:center;margin-bottom:32px;font-size:14px}.auth-form{flex-direction:column;gap:18px;display:flex}.auth-footer{text-align:center;color:var(--text-muted);margin-top:24px;font-size:13px}.auth-footer a{color:var(--accent);font-weight:600}.auth-footer a:hover{text-decoration:underline}.pw-strength{flex-direction:column;gap:6px;margin-top:8px;display:flex}.pw-strength-bar{background:var(--bg-tertiary);border-radius:2px;height:4px;overflow:hidden}.pw-strength-fill{border-radius:2px;height:100%;transition:width .3s,background .3s}.pw-strength-label{font-size:11px;font-weight:600}.pw-requirements{flex-direction:column;gap:3px;margin-top:4px;display:flex}.pw-req{align-items:center;gap:5px;font-size:11px;display:flex}.pw-req.met{color:var(--success)}.pw-req.unmet{color:var(--text-muted)}.pw-req 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