:root{--blue:#425CC7;--navy:#132048;--gold:#FFB71B;--kg:#9078b7;--bg:#f4f6fb;--card:#fff;--muted:#6b7280;--line:#e5e7eb;--red:#dc2626;--green:#16a34a}*{box-sizing:border-box}body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--navy)}a{text-decoration:none;color:inherit}.login-body{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,var(--blue),var(--navy))}.login-card{background:#fff;width:min(440px,92vw);padding:34px;border-radius:28px;box-shadow:0 24px 80px rgba(0,0,0,.25)}.login-card h1{margin:10px 0;font-size:32px}.logo-line{display:flex;align-items:center;gap:12px}.logo-mark{width:54px;height:54px;border-radius:18px;background:var(--gold);display:grid;place-items:center;font-weight:900}.field{display:flex;flex-direction:column;gap:7px;margin:15px 0}.field label{font-weight:800}.field input,.field select,.field textarea{border:1px solid var(--line);border-radius:14px;padding:13px 14px;font:inherit;background:#fff}.btn{border:0;border-radius:14px;padding:11px 16px;font-weight:900;display:inline-flex;align-items:center;gap:8px;cursor:pointer;background:#eef2ff;color:var(--blue)}.btn.primary{background:var(--blue);color:white}.btn.gold{background:var(--gold);color:var(--navy)}.btn.danger{background:#fee2e2;color:var(--red)}.btn.sm{padding:8px 11px;border-radius:11px;font-size:13px}.alert{padding:12px 14px;border-radius:14px;background:#fff7ed;color:#9a3412;margin:10px 0}.app{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{background:#fff;border-right:1px solid var(--line);padding:22px;position:sticky;top:0;height:100vh}.brand{display:flex;gap:12px;align-items:center;margin-bottom:26px}.brand h2{margin:0;font-size:20px}.brand small{color:var(--muted);font-weight:700}.nav a{display:flex;gap:12px;align-items:center;padding:13px 14px;border-radius:15px;margin:6px 0;color:#334155;font-weight:800}.nav a.active,.nav a:hover{background:var(--blue);color:white}.main{padding:24px 28px}.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.topbar h1{margin:0;font-size:30px}.top-actions{display:flex;gap:10px;align-items:center}.grid{display:grid;gap:18px}.grid.cards{grid-template-columns:repeat(4,minmax(0,1fr))}.grid.two{grid-template-columns:1.2fr .8fr}.card{background:var(--card);border:1px solid var(--line);border-radius:24px;box-shadow:0 10px 30px rgba(15,23,42,.05);padding:20px}.hero{background:linear-gradient(135deg,var(--blue),#253a9b);color:#fff;border-radius:28px;padding:28px;display:flex;justify-content:space-between;gap:20px;align-items:flex-end;margin-bottom:20px}.hero h1{font-size:36px;margin:0 0 8px}.hero p{margin:0;color:#e0e7ff}.kpi strong{font-size:32px;display:block}.kpi span{color:var(--muted);font-weight:800}.class-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.class-card{overflow:hidden;padding:0}.class-cover{padding:22px;background:linear-gradient(135deg,var(--blue),var(--navy));color:#fff;min-height:126px}.class-cover h3{margin:0;font-size:22px}.class-body{padding:16px}.badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:#eef2ff;color:var(--blue);font-weight:900;font-size:12px}.badge.green{background:#dcfce7;color:var(--green)}.badge.gold{background:#fef3c7;color:#92400e}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}.tabs a{padding:10px 14px;border-radius:999px;background:white;border:1px solid var(--line);font-weight:900}.tabs a.active{background:var(--blue);color:white}.post{border:1px solid var(--line);border-radius:20px;padding:18px;background:#fff;margin-bottom:14px}.post-head{display:flex;justify-content:space-between;gap:10px}.post-title{font-size:18px;font-weight:900}.muted{color:var(--muted)}.table{width:100%;border-collapse:separate;border-spacing:0 9px}.table th{text-align:left;color:var(--muted);font-size:13px}.table td,.table th{padding:10px 12px}.table tbody tr{background:#fff;box-shadow:0 0 0 1px var(--line);border-radius:16px}.table tbody td:first-child{border-radius:16px 0 0 16px}.table tbody td:last-child{border-radius:0 16px 16px 0}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.form-grid .full{grid-column:1/-1}.quick{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}.quick a{background:#f8fafc;border:1px solid var(--line);padding:15px;border-radius:16px;font-weight:900}.student-list{max-height:520px;overflow:auto}.avatar{width:38px;height:38px;border-radius:14px;background:var(--gold);display:inline-grid;place-items:center;font-weight:900;margin-right:8px}@media(max-width:900px){.app{grid-template-columns:1fr}.sidebar{position:relative;height:auto}.main{padding:16px}.grid.cards,.grid.two{grid-template-columns:1fr}.hero{display:block}.form-grid{grid-template-columns:1fr}.topbar{align-items:flex-start;gap:12px;flex-direction:column}}