:root{
  --bg:#f5f7fb;
  --panel:#ffffff;
  --text:#172033;
  --muted:#6b7280;
  --line:#e5e7eb;
  --primary:#2563eb;
  --primary-soft:#eff6ff;
  --sidebar:#0f172a;
  --sidebar-soft:#1e293b;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;font-size:14px;line-height:1.45}
a{text-decoration:none}.app-shell{display:flex;min-height:100vh}.sidebar{width:260px;background:linear-gradient(180deg,var(--sidebar),#111827);color:#fff;position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;z-index:1040}.sidebar-brand{height:72px;display:flex;align-items:center;gap:12px;padding:0 20px;border-bottom:1px solid rgba(255,255,255,.08)}.brand-mark{width:38px;height:38px;border-radius:12px;background:#2563eb;display:grid;place-items:center}.brand-title{font-weight:700;font-size:15px;letter-spacing:.2px}.brand-subtitle{font-size:12px;color:#cbd5e1;margin-top:-1px}.sidebar-nav{padding:14px 12px;overflow:auto}.sidebar-nav .nav-link{display:flex;align-items:center;gap:10px;color:#cbd5e1;border-radius:12px;padding:10px 12px;margin-bottom:3px;font-size:13px;transition:.15s}.sidebar-nav .nav-link:hover{background:rgba(255,255,255,.08);color:#fff}.sidebar-nav .nav-link.active{background:#2563eb;color:#fff}.sidebar-nav .nav-link i{width:20px;text-align:center}.sidebar-footer{margin-top:auto;padding:16px 20px;border-top:1px solid rgba(255,255,255,.08)}.main{margin-left:260px;min-width:0;flex:1}.topbar{height:72px;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:14px;padding:0 24px;position:sticky;top:0;z-index:900}.topbar h1{font-size:18px;margin:0;font-weight:700}.topbar p{font-size:12px;margin:2px 0 0;color:var(--muted)}.content{padding:24px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:0 12px 30px rgba(15,23,42,.04)}.panel-header{padding:18px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px}.panel-title{font-size:15px;font-weight:700;margin:0}.panel-subtitle{font-size:12px;color:var(--muted);margin:2px 0 0}.panel-body{padding:20px}.metric-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;display:flex;align-items:center;justify-content:space-between;box-shadow:0 12px 30px rgba(15,23,42,.04);min-height:104px}.metric-label{font-size:12px;color:var(--muted);margin-bottom:8px}.metric-value{font-size:24px;font-weight:750;letter-spacing:-.6px}.metric-icon{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;font-size:19px}.tone-primary{background:#eff6ff;color:#2563eb}.tone-success{background:#ecfdf5;color:#059669}.tone-warning{background:#fffbeb;color:#d97706}.tone-danger{background:#fef2f2;color:#dc2626}.table{font-size:13px}.table thead th{font-size:12px;color:#475569;background:#f8fafc;white-space:nowrap}.btn{font-size:13px;border-radius:10px}.form-control,.form-select{font-size:13px;border-radius:10px;border-color:#dbe2ea}.form-label{font-size:12px;font-weight:650;color:#334155}.small-muted{font-size:12px;color:var(--muted)}.codebox{font-family:"JetBrains Mono",Consolas,monospace;font-size:12px;min-height:360px;white-space:pre;line-height:1.55}.badge-soft{background:#f1f5f9;color:#334155;border:1px solid #e2e8f0}.schedule-cell{min-width:120px}.schedule-wrap{overflow:auto}.schedule-table th,.schedule-table td{vertical-align:middle;text-align:center}.schedule-table td .subject{font-weight:650}.schedule-table td .teacher{font-size:11px;color:#64748b}.login-page{min-height:100vh;display:grid;place-items:center;background:radial-gradient(circle at top left,#dbeafe,transparent 30%),linear-gradient(135deg,#f8fafc,#eef2ff)}.login-card{width:min(420px,92vw);background:#fff;border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:0 30px 80px rgba(15,23,42,.1)}.login-logo{width:52px;height:52px;border-radius:16px;background:#2563eb;color:#fff;display:grid;place-items:center;font-size:24px;margin-bottom:18px}.text-xs{font-size:12px}.copy-btn{position:absolute;right:12px;top:12px}.position-relative textarea{padding-top:46px}
@media(max-width:991.98px){.sidebar{transform:translateX(-100%);transition:.2s}.sidebar.show{transform:translateX(0)}.main{margin-left:0}.topbar{padding:0 16px}.content{padding:16px}.metric-value{font-size:20px}}