:root{--black: #0a0a0a;--dark: #111318;--surface: #16191f;--surface2: #1e222b;--border: #2a2f3a;--border2: #353b47;--text: #e8eaf0;--text-muted: #7a8194;--text-dim: #4a5068;--accent: #00e5a0;--accent-dim: rgba(0, 229, 160, .12);--accent-glow: rgba(0, 229, 160, .3);--blue: #4d9fff;--blue-dim: rgba(77, 159, 255, .12);--purple: #b57bee;--purple-dim: rgba(181, 123, 238, .12);--orange: #ff8c42;--orange-dim: rgba(255, 140, 66, .12);--red: #ff5a5a;--red-dim: rgba(255, 90, 90, .12);--radius: 12px;--radius-sm: 8px;--radius-lg: 16px;--font-head: "Syne", sans-serif;--font-mono: "Space Mono", monospace;--font-body: "Inter", sans-serif;--sidebar-width: 260px;--transition: .2s ease}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--black);color:var(--text);font-family:var(--font-body);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--dark)}::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}.layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:var(--dark);border-right:1px solid var(--border);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;padding:0}.sidebar-logo{padding:24px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px}.logo-icon{width:36px;height:36px;background:var(--accent);border-radius:8px;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:16px;font-weight:700;color:var(--black);flex-shrink:0}.logo-text{font-family:var(--font-head);font-size:18px;font-weight:800;color:var(--text)}.logo-sub{font-family:var(--font-mono);font-size:10px;color:var(--text-muted);letter-spacing:.1em}.sidebar-nav{padding:16px 12px;flex:1;display:flex;flex-direction:column;gap:2px}.nav-label{font-family:var(--font-mono);font-size:10px;color:var(--text-dim);letter-spacing:.15em;text-transform:uppercase;padding:8px 8px 4px}.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);color:var(--text-muted);text-decoration:none;font-size:14px;font-weight:500;transition:all var(--transition);cursor:pointer;border:none;background:none;width:100%;text-align:left}.nav-item:hover{background:var(--surface);color:var(--text)}.nav-item.active{background:var(--accent-dim);color:var(--accent);border:1px solid rgba(0,229,160,.15)}.nav-item svg{width:18px;height:18px;flex-shrink:0}.sidebar-footer{padding:16px 12px;border-top:1px solid var(--border)}.professor-card{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);background:var(--surface)}.professor-avatar{width:36px;height:36px;background:var(--accent-dim);border:1px solid rgba(0,229,160,.3);border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--font-head);font-weight:700;color:var(--accent);font-size:14px;flex-shrink:0}.professor-info{flex:1;min-width:0}.professor-name{font-size:13px;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.professor-role{font-size:11px;color:var(--text-muted);font-family:var(--font-mono)}.logout-btn{padding:6px;background:none;border:none;color:var(--text-dim);cursor:pointer;border-radius:6px;transition:all var(--transition);display:flex}.logout-btn:hover{color:var(--red);background:var(--red-dim)}.main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh;background:var(--black)}.page-header{padding:32px 40px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:16px}.page-title{font-family:var(--font-head);font-size:28px;font-weight:800;color:var(--text);letter-spacing:-.02em}.page-subtitle{color:var(--text-muted);font-size:14px;margin-top:2px}.page-body{padding:32px 40px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:all var(--transition)}.card:hover{border-color:var(--border2)}.card-grid{display:grid;gap:16px}.card-grid-2{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.card-grid-3{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.card-grid-4{grid-template-columns:repeat(4,1fr)}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;display:flex;align-items:center;gap:16px}.stat-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.stat-icon svg{width:22px;height:22px}.stat-icon.green{background:var(--accent-dim);color:var(--accent)}.stat-icon.blue{background:var(--blue-dim);color:var(--blue)}.stat-icon.purple{background:var(--purple-dim);color:var(--purple)}.stat-icon.orange{background:var(--orange-dim);color:var(--orange)}.stat-value{font-family:var(--font-head);font-size:32px;font-weight:800;color:var(--text);line-height:1}.stat-label{color:var(--text-muted);font-size:13px;margin-top:4px}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;cursor:pointer;border:none;transition:all var(--transition);text-decoration:none;white-space:nowrap}.btn svg{width:16px;height:16px}.btn-primary{background:var(--accent);color:var(--black)}.btn-primary:hover{background:#00c98a;box-shadow:0 0 20px var(--accent-glow)}.btn-secondary{background:var(--surface2);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--border2);background:var(--surface)}.btn-danger{background:var(--red-dim);color:var(--red);border:1px solid rgba(255,90,90,.2)}.btn-danger:hover{background:#ff5a5a33}.btn-ghost{background:transparent;color:var(--text-muted)}.btn-ghost:hover{background:var(--surface);color:var(--text)}.btn-sm{padding:6px 12px;font-size:13px}.btn-icon{padding:8px}.btn-icon svg{margin:0}.form-group{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.form-label{font-size:13px;font-weight:500;color:var(--text-muted);font-family:var(--font-mono)}.form-input,.form-select,.form-textarea{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px;color:var(--text);font-size:14px;font-family:var(--font-body);transition:all var(--transition);width:100%}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}.form-input::placeholder,.form-textarea::placeholder{color:var(--text-dim)}.form-select{cursor:pointer}.form-textarea{resize:vertical;min-height:100px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.form-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:8px;padding-top:16px;border-top:1px solid var(--border)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000c;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn .15s ease}.modal{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:560px;max-height:90vh;overflow-y:auto;animation:slideUp .2s ease}.modal-header{padding:24px 24px 0;display:flex;align-items:center;justify-content:space-between}.modal-title{font-family:var(--font-head);font-size:20px;font-weight:700;color:var(--text)}.modal-body{padding:20px 24px 24px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}table{width:100%;border-collapse:collapse}thead{background:var(--surface)}th{padding:12px 16px;text-align:left;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--text-muted);text-transform:uppercase;border-bottom:1px solid var(--border);white-space:nowrap}td{padding:14px 16px;border-bottom:1px solid var(--border);color:var(--text)}tr:last-child td{border-bottom:none}tr:hover td{background:var(--surface)}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600;font-family:var(--font-mono)}.badge-green{background:var(--accent-dim);color:var(--accent)}.badge-blue{background:var(--blue-dim);color:var(--blue)}.badge-purple{background:var(--purple-dim);color:var(--purple)}.badge-orange{background:var(--orange-dim);color:var(--orange)}.badge-red{background:var(--red-dim);color:var(--red)}.badge-gray{background:#7a81941f;color:var(--text-muted)}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.empty-state-icon{width:60px;height:60px;background:var(--surface2);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;color:var(--text-dim)}.empty-state-icon svg{width:28px;height:28px}.empty-state h3{font-family:var(--font-head);font-size:18px;color:var(--text);margin-bottom:6px}.empty-state p{font-size:14px;color:var(--text-muted)}.alert{padding:12px 16px;border-radius:var(--radius-sm);font-size:14px;margin-bottom:16px;display:flex;align-items:flex-start;gap:10px}.alert-error{background:var(--red-dim);color:var(--red);border:1px solid rgba(255,90,90,.2)}.alert-success{background:var(--accent-dim);color:var(--accent);border:1px solid rgba(0,229,160,.2)}.login-page{min-height:100vh;background:var(--black);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.login-bg{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 600px 400px at 20% 50%,rgba(0,229,160,.06) 0%,transparent 70%),radial-gradient(ellipse 400px 300px at 80% 20%,rgba(77,159,255,.05) 0%,transparent 70%)}.login-grid{position:absolute;top:0;right:0;bottom:0;left:0;background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);background-size:40px 40px;opacity:.3}.login-card{position:relative;width:100%;max-width:420px;background:var(--dark);border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px;box-shadow:0 40px 80px #00000080}.login-logo{display:flex;align-items:center;gap:12px;margin-bottom:32px}.login-title{font-family:var(--font-head);font-size:24px;font-weight:800;color:var(--text);margin-bottom:8px}.login-subtitle{color:var(--text-muted);font-size:14px;margin-bottom:28px}.login-default{margin-top:20px;padding:12px;background:var(--surface2);border-radius:var(--radius-sm);font-family:var(--font-mono);font-size:12px;color:var(--text-muted)}.login-default code{color:var(--accent)}.loading{display:flex;align-items:center;justify-content:center;padding:60px;color:var(--text-muted);gap:12px}.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.material-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:all var(--transition);display:flex;flex-direction:column;gap:12px}.material-card:hover{border-color:var(--border2);transform:translateY(-1px)}.material-type-icon{width:42px;height:42px;border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.material-type-icon svg{width:20px;height:20px}.material-header{display:flex;align-items:flex-start;gap:12px}.material-info{flex:1;min-width:0}.material-title{font-size:15px;font-weight:600;color:var(--text);margin-bottom:4px}.material-desc{font-size:13px;color:var(--text-muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.material-footer{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}.material-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.chip{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border-radius:6px;font-size:12px;color:var(--text-muted);background:var(--surface2);font-family:var(--font-mono)}.search-bar{position:relative;flex:1;max-width:320px}.search-bar svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-dim);width:16px;height:16px}.search-input{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:9px 14px 9px 38px;color:var(--text);font-size:14px;width:100%;transition:all var(--transition)}.search-input:focus{outline:none;border-color:var(--accent)}.search-input::placeholder{color:var(--text-dim)}.toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.section-title{font-family:var(--font-head);font-size:16px;font-weight:700;color:var(--text);margin-bottom:16px;display:flex;align-items:center;gap:8px}.section-title:after{content:"";flex:1;height:1px;background:var(--border)}@media (max-width: 768px){.sidebar{transform:translate(-100%)}.main-content{margin-left:0}.page-header,.page-body{padding:20px}.card-grid-4{grid-template-columns:1fr 1fr}.form-row{grid-template-columns:1fr}}