:root{color-scheme:dark;--bg: #05060f;--surface: rgba(17, 20, 40, .65);--surface-solid: #0d1024;--text: #e6e9ff;--muted: #8a90b8;--border: rgba(120, 130, 255, .16);--primary: #7c5cff;--primary-hover: #9a80ff;--primary-soft: rgba(124, 92, 255, .14);--cyan: #00e5ff;--pink: #ff3df2;--ok: #00ffa3;--ok-soft: rgba(0, 255, 163, .12);--bad: #ff4d6d;--bad-soft: rgba(255, 77, 109, .12);--grad: linear-gradient(120deg, #00e5ff 0%, #7c5cff 50%, #ff3df2 100%);--radius: 16px;--mono: "JetBrains Mono", ui-monospace, Menlo, monospace;--glow: 0 0 0 1px rgba(124, 92, 255, .35), 0 8px 40px rgba(124, 92, 255, .25)}*{box-sizing:border-box}html{background:var(--bg)}body{margin:0;min-height:100vh;font-family:Space Grotesk,system-ui,-apple-system,Segoe UI,Noto Sans Khmer,sans-serif;color:var(--text);line-height:1.55;background-color:var(--bg);background-image:radial-gradient(900px 500px at 10% -10%,rgba(124,92,255,.28),transparent 60%),radial-gradient(800px 500px at 95% 10%,rgba(0,229,255,.16),transparent 60%),radial-gradient(700px 500px at 50% 110%,rgba(255,61,242,.14),transparent 60%);background-attachment:fixed}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:0;background-image:linear-gradient(rgba(124,92,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(124,92,255,.07) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 80%);-webkit-mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 80%)}#root{position:relative;z-index:1}a{color:inherit;text-decoration:none}h1,h2,h3{line-height:1.15;margin:0 0 .5rem;letter-spacing:-.02em}h1{font-size:clamp(2rem,5vw,3.4rem);font-weight:700}h2{font-size:1.2rem}code{font-family:var(--mono);background:var(--primary-soft);color:var(--cyan);padding:0 5px;border-radius:4px}::selection{background:var(--primary);color:#fff}.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}.container{max-width:1120px;margin:0 auto;padding:28px 16px 72px}.narrow{max-width:420px}.muted{color:var(--muted)}.small{font-size:.8rem;font-family:var(--mono)}.error{color:var(--bad);margin:0}.success{color:var(--ok);margin:0}.grow{flex:1;min-width:0}.row-between{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:16px}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.back{display:inline-block;color:var(--muted);margin-bottom:18px;font-family:var(--mono);font-size:.85rem}.back:hover{color:var(--cyan)}.nav{position:sticky;top:0;z-index:10;background:#05060fb3;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}.nav-inner{display:flex;justify-content:space-between;align-items:center;padding-top:14px;padding-bottom:14px}.brand{font-weight:700;font-size:1.1rem;display:flex;align-items:center;gap:4px}.brand-mark{font-size:1.4rem;margin-right:6px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 8px rgba(0,229,255,.6))}.nav-links{display:flex;align-items:center;gap:20px;font-family:var(--mono);font-size:.88rem}.nav-links a{color:var(--muted);transition:color .15s}.nav-links a:hover{color:var(--cyan)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;background:var(--grad);background-size:200% 100%;color:#fff;border:1px solid transparent;padding:10px 18px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer;transition:background-position .4s,box-shadow .2s,transform .1s;box-shadow:0 0 20px #7c5cff59}.btn:hover{background-position:100% 0;box-shadow:0 0 30px #00e5ff73}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-secondary{background:var(--primary-soft);color:#c9bcff;border-color:#7c5cff66;box-shadow:none}.btn-secondary:hover{background:#7c5cff40;box-shadow:0 0 18px #7c5cff59}.btn-ghost{background:transparent;color:var(--text);border-color:var(--border);box-shadow:none}.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan);box-shadow:0 0 14px #00e5ff40}.btn-danger{background:var(--bad-soft);color:var(--bad);border-color:#ff4d6d59;box-shadow:none}.btn-danger:hover{background:#ff4d6d38;box-shadow:0 0 14px #ff4d6d4d}.btn-small{padding:5px 10px;font-size:.8rem}.input{width:100%;padding:11px 13px;border-radius:10px;border:1px solid var(--border);background:#05060f99;color:var(--text);font:inherit;transition:border-color .15s,box-shadow .15s}.input::placeholder{color:#575d85}.input:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px #00e5ff26}.search{margin:8px 0 22px;max-width:420px;font-family:var(--mono);font-size:.9rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}.empty{text-align:center;color:var(--muted);font-family:var(--mono);font-size:.9rem;padding:32px}.notice{margin-bottom:16px;padding:12px 16px;font-family:var(--mono);font-size:.85rem}.form{display:flex;flex-direction:column;gap:14px}.form label{display:flex;flex-direction:column;gap:6px;font-size:.85rem;font-weight:500;color:var(--muted)}fieldset{border:1px dashed rgba(0,229,255,.25);border-radius:10px;padding:12px;display:flex;flex-direction:column;gap:12px;margin:0}legend{font-size:.75rem;color:var(--cyan);padding:0 6px;font-family:var(--mono)}.form.editing{border-color:#00e5ff80;box-shadow:0 0 0 1px #00e5ff40,0 8px 40px #00e5ff26}.form h2+.small{margin-top:-10px;color:var(--cyan)}input[type=file].input{padding:8px;font-size:.85rem;color:var(--muted)}input[type=file]::file-selector-button{margin-right:10px;padding:6px 12px;border-radius:8px;cursor:pointer;border:1px solid rgba(124,92,255,.4);background:var(--primary-soft);color:#c9bcff;font:inherit;font-weight:600}input[type=file]::file-selector-button:hover{background:#7c5cff40}.preview{width:100%;max-height:180px;object-fit:cover;border-radius:10px;border:1px solid var(--border)}.pill{display:inline-block;font-family:var(--mono);font-size:.75rem;font-weight:600;padding:3px 10px;border-radius:999px;background:#00e5ff14;color:var(--cyan);border:1px solid rgba(0,229,255,.3)}.badge{display:inline-block;font-family:var(--mono);font-size:.7rem;font-weight:600;padding:2px 8px;border-radius:6px;border:1px solid transparent}.badge.ok{background:var(--ok-soft);color:var(--ok);border-color:#00ffa34d}.badge.bad{background:var(--bad-soft);color:var(--bad);border-color:#ff4d6d4d}.badge.neutral{background:#8a90b81a;color:var(--muted);border-color:var(--border)}.hero{padding:48px 0 40px}.eyebrow{display:inline-block;font-family:var(--mono);font-size:.82rem;color:var(--cyan);margin-bottom:14px;letter-spacing:.04em}.hero p{font-size:1.1rem;max-width:560px}.hero-stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;font-family:var(--mono);font-size:.82rem}.hero-stats span{padding:6px 12px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--muted)}.hero-stats b{color:var(--text)}.live{display:inline-flex;align-items:center;gap:8px;color:var(--ok)!important}.live i{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 10px var(--ok);animation:pulse 1.6s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.3}}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}.class-card,.student-card{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:transform .2s,box-shadow .2s,border-color .2s}.class-card{overflow:hidden;display:flex;flex-direction:column}.class-card:hover,.student-card:hover{transform:translateY(-4px);border-color:#7c5cff99;box-shadow:var(--glow)}.class-img{aspect-ratio:16 / 9;background:linear-gradient(135deg,#7c5cff40,#00e5ff1f);display:grid;place-items:center;font-size:3rem;position:relative}.class-img:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(180deg,transparent 50%,rgba(5,6,15,.85))}.class-img img{width:100%;height:100%;object-fit:cover}.class-body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;align-items:flex-start}.class-body h3{font-size:1.15rem;margin:0}.clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin:0;font-size:.92rem}.class-header{display:flex;gap:24px;align-items:center;margin-bottom:24px;flex-wrap:wrap}.class-header img{width:240px;max-width:100%;aspect-ratio:16 / 10;object-fit:cover;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--glow)}.class-header>div{flex:1;min-width:240px}.student-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}.student-card{display:flex;align-items:center;gap:14px;padding:14px 16px}.avatar{width:46px;height:46px;flex-shrink:0;clip-path:polygon(25% 5%,75% 5%,100% 50%,75% 95%,25% 95%,0 50%);background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:700;font-size:1.1rem}.student-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.link{color:var(--cyan);font-family:var(--mono);font-size:.8rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.badges{display:flex;align-items:center;gap:8px;margin-top:4px}.arrow{color:var(--muted);transition:color .15s,transform .15s}.student-card:hover .arrow{color:var(--cyan);transform:translate(2px,-2px)}.admin-layout{display:grid;grid-template-columns:360px 1fr;gap:24px;align-items:start}.admin-list{display:flex;flex-direction:column;gap:10px}.admin-item{display:flex;align-items:center;gap:12px;padding:12px;flex-wrap:wrap}.thumb{width:64px;height:44px;border-radius:8px;overflow:hidden;background:var(--primary-soft);display:grid;place-items:center}.thumb img{width:100%;height:100%;object-fit:cover}.table-wrap{overflow-x:auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.table{width:100%;border-collapse:collapse;font-size:.9rem}.table th,.table td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--border);vertical-align:middle}.table th{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.table tbody tr:hover{background:#7c5cff0f}.table tr:last-child td{border-bottom:none}.table .link{display:inline-block;max-width:220px}.row-actions{white-space:nowrap;display:flex;gap:6px;justify-content:flex-end}.footer{border-top:1px solid var(--border);background:#05060f99}.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;padding-top:20px;padding-bottom:20px;font-family:var(--mono);font-size:.78rem;color:var(--muted)}#root{display:flex;flex-direction:column;min-height:100vh}#root>main{flex:1}@media (max-width: 860px){.admin-layout{grid-template-columns:1fr}.nav-links{gap:12px}}@media (max-width: 560px){.brand{font-size:.95rem}.nav-links a:first-child{display:none}}