*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0a0a0b;--surface: #111113;--surface2: #18181c;--border: #2a2a30;--border2: #3a3a44;--accent: #e8f54e;--accent2: #b8d43a;--danger: #ff4757;--warn: #ffa502;--text: #f0f0f0;--muted: #888896;--faint: #3a3a44;--font-head: "Syne", sans-serif;--font-mono: "DM Mono", monospace;--radius: 6px;--radius-lg: 12px;--transition: .18s cubic-bezier(.4, 0, .2, 1)}html{scroll-behavior:smooth}body{font-family:var(--font-head);background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden;line-height:1.5}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border2);border-radius:99px}.dashboard{display:grid;grid-template-rows:auto 1fr;min-height:100vh}.header{display:flex;align-items:center;gap:16px;padding:20px 40px;border-bottom:1px solid var(--border);background:var(--surface);position:sticky;top:0;z-index:100}.header-logo{display:flex;align-items:center;gap:10px}.header-logo-mark{width:36px;height:36px;background:var(--accent);border-radius:6px;display:grid;place-items:center;flex-shrink:0}.header-logo-mark svg{width:18px;height:18px;color:#0a0a0b}.header-title{font-size:17px;font-weight:700;letter-spacing:-.3px;color:var(--text)}.header-subtitle{font-size:11px;font-family:var(--font-mono);color:var(--muted);letter-spacing:.5px;text-transform:uppercase}.header-stats{margin-left:auto;display:flex;align-items:center;gap:24px}.stat-chip{display:flex;align-items:center;gap:8px;font-family:var(--font-mono)}.stat-chip-value{font-size:20px;font-weight:500;color:var(--accent);font-family:var(--font-head);font-weight:800;line-height:1}.stat-chip-label{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px}.main-content{display:grid;grid-template-columns:360px 1fr;gap:0;height:calc(100vh - 77px);overflow:hidden}.sidebar{border-right:1px solid var(--border);padding:32px 28px;background:var(--surface);overflow-y:auto;display:flex;flex-direction:column;gap:28px}.list-panel{padding:32px 36px;overflow-y:auto;background:var(--bg)}.section-label{font-size:10px;font-family:var(--font-mono);color:var(--muted);text-transform:uppercase;letter-spacing:2px;margin-bottom:16px;display:flex;align-items:center;gap:8px}.section-label:after{content:"";flex:1;height:1px;background:var(--border)}.form-title{font-size:22px;font-weight:800;letter-spacing:-.5px;line-height:1.1;margin-bottom:6px}.form-title span{color:var(--accent)}.form-description{font-size:13px;color:var(--muted);margin-bottom:24px;line-height:1.6}.form-group{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.form-label{font-size:11px;font-family:var(--font-mono);color:var(--muted);text-transform:uppercase;letter-spacing:1px}.form-input{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius);padding:11px 14px;font-size:14px;font-family:var(--font-head);color:var(--text);transition:border-color var(--transition),box-shadow var(--transition);outline:none;width:100%}.form-input::placeholder{color:var(--faint)}.form-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #e8f54e1a}.form-input.error-input{border-color:var(--danger);box-shadow:0 0 0 3px #ff47571a}.form-actions{display:flex;gap:10px;margin-top:4px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 18px;font-size:13px;font-weight:600;font-family:var(--font-head);border:none;border-radius:var(--radius);cursor:pointer;transition:all var(--transition);letter-spacing:.2px;white-space:nowrap;flex:1}.btn svg{width:15px;height:15px;flex-shrink:0}.btn-primary{background:var(--accent);color:#0a0a0b}.btn-primary:hover{background:var(--accent2);transform:translateY(-1px);box-shadow:0 4px 16px #e8f54e40}.btn-primary:active{transform:translateY(0)}.btn-ghost{background:var(--surface2);color:var(--muted);border:1px solid var(--border);flex:0;padding:10px 14px}.btn-ghost:hover{border-color:var(--border2);color:var(--text)}.btn-danger-ghost{background:transparent;color:var(--danger);border:1px solid rgba(255,71,87,.3);padding:7px 12px;font-size:12px;flex:0}.btn-danger-ghost:hover{background:#ff47571a;border-color:var(--danger)}.btn-edit{background:#e8f54e14;color:var(--accent);border:1px solid rgba(232,245,78,.2);padding:7px 12px;font-size:12px;flex:0}.btn-edit:hover{background:#e8f54e26;border-color:#e8f54e66}.btn-sm{padding:6px 12px;font-size:12px}.toast-container{position:fixed;bottom:28px;right:28px;display:flex;flex-direction:column;gap:8px;z-index:1000}.toast{display:flex;align-items:center;gap:12px;padding:14px 18px;border-radius:var(--radius-lg);font-size:13px;font-weight:500;border:1px solid;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);animation:toastIn .25s cubic-bezier(.34,1.56,.64,1) forwards;max-width:320px}.toast-success{background:#111113f2;border-color:#e8f54e4d;color:var(--accent)}.toast-error{background:#111113f2;border-color:#ff47574d;color:var(--danger)}.toast-icon{font-size:16px}@keyframes toastIn{0%{opacity:0;transform:translateY(12px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}.list-toolbar{display:flex;align-items:center;gap:12px;margin-bottom:24px}.search-wrapper{position:relative;flex:1}.search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted);pointer-events:none;width:15px;height:15px}.search-input{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:10px 14px 10px 36px;font-size:13px;font-family:var(--font-head);color:var(--text);outline:none;transition:border-color var(--transition)}.search-input::placeholder{color:var(--muted)}.search-input:focus{border-color:var(--border2)}.sort-select{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:10px 28px 10px 12px;font-size:12px;font-family:var(--font-mono);color:var(--muted);outline:none;cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888896' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 8px center;transition:border-color var(--transition)}.sort-select:focus{border-color:var(--border2);color:var(--text)}.students-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.student-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;transition:border-color var(--transition),box-shadow var(--transition),transform var(--transition);animation:cardIn .3s ease forwards;position:relative;overflow:hidden}.student-card:before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--accent),transparent);opacity:0;transition:opacity var(--transition)}.student-card:hover{border-color:var(--border2);box-shadow:0 8px 24px #0006;transform:translateY(-2px)}.student-card:hover:before{opacity:1}.student-card.is-editing{border-color:#e8f54e66;box-shadow:0 0 0 1px #e8f54e26,0 8px 24px #0006}.student-card.is-editing:before{opacity:1}@keyframes cardIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.card-avatar{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;font-size:16px;font-weight:800;margin-bottom:14px;flex-shrink:0;background:#e8f54e1a;color:var(--accent);border:1px solid rgba(232,245,78,.15);font-family:var(--font-mono)}.card-name{font-size:16px;font-weight:700;color:var(--text);margin-bottom:4px;letter-spacing:-.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-email{font-size:12px;font-family:var(--font-mono);color:var(--muted);margin-bottom:10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-course-badge{display:inline-flex;align-items:center;padding:3px 10px;background:var(--surface2);border:1px solid var(--border);border-radius:99px;font-size:11px;font-family:var(--font-mono);color:var(--muted);margin-bottom:16px;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-actions{display:flex;gap:8px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:80px 20px;text-align:center;color:var(--muted);gap:12px}.empty-icon{width:56px;height:56px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);display:grid;place-items:center;color:var(--faint);margin-bottom:8px}.empty-icon svg{width:24px;height:24px}.empty-title{font-size:16px;font-weight:700;color:var(--text);letter-spacing:-.3px}.empty-desc{font-size:13px;color:var(--muted);max-width:220px}.loading-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.skeleton-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px}.skeleton{background:linear-gradient(90deg,var(--surface2) 25%,var(--faint) 50%,var(--surface2) 75%);background-size:200% 100%;animation:shimmer 1.4s infinite;border-radius:4px}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.sk-avatar{width:40px;height:40px;border-radius:10px;margin-bottom:14px}.sk-name{height:16px;width:60%;margin-bottom:8px}.sk-email{height:12px;width:80%;margin-bottom:12px}.sk-badge{height:20px;width:40%;border-radius:99px;margin-bottom:16px}.sk-btns{height:30px}.count-badge{background:var(--surface2);border:1px solid var(--border);border-radius:99px;padding:2px 10px;font-size:11px;font-family:var(--font-mono);color:var(--muted)}.list-header{display:flex;align-items:center;gap:10px;margin-bottom:24px}.list-heading{font-size:20px;font-weight:800;letter-spacing:-.4px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:grid;place-items:center;z-index:200;animation:fadeIn .15s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal{background:var(--surface);border:1px solid var(--border2);border-radius:var(--radius-lg);padding:28px;width:100%;max-width:380px;animation:modalIn .2s cubic-bezier(.34,1.56,.64,1)}@keyframes modalIn{0%{opacity:0;transform:scale(.94)}to{opacity:1;transform:scale(1)}}.modal-icon{width:44px;height:44px;background:#ff47571a;border:1px solid rgba(255,71,87,.2);border-radius:10px;display:grid;place-items:center;color:var(--danger);margin-bottom:16px}.modal-icon svg{width:20px;height:20px}.modal-title{font-size:17px;font-weight:700;margin-bottom:8px;letter-spacing:-.3px}.modal-desc{font-size:13px;color:var(--muted);margin-bottom:24px;line-height:1.6}.modal-actions{display:flex;gap:10px}.btn-cancel{background:var(--surface2);color:var(--text);border:1px solid var(--border);flex:1}.btn-cancel:hover{border-color:var(--border2)}.btn-confirm-danger{background:var(--danger);color:#fff;border:none;flex:1}.btn-confirm-danger:hover{background:#ff6b7a;transform:translateY(-1px)}.error-banner{display:flex;align-items:center;gap:10px;padding:14px 16px;background:#ff475714;border:1px solid rgba(255,71,87,.2);border-radius:var(--radius);color:var(--danger);font-size:13px}.field-error{font-size:11px;color:var(--danger);font-family:var(--font-mono);margin-top:2px}.divider{height:1px;background:var(--border);margin:4px 0}@media (max-width: 900px){.main-content{grid-template-columns:1fr;height:auto;overflow:visible}.sidebar{border-right:none;border-bottom:1px solid var(--border)}.list-panel{padding:24px 20px}.header{padding:16px 20px;flex-wrap:wrap;gap:12px}.header-stats{margin-left:0;width:100%}}