:root{--p:#0f2f5f;--p2:#174a8b;--a:#f59e0b;--g:#16a34a;--r:#dc2626;--bg:#f3f6fb;--b:#d8e0ef}
*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,Arial,sans-serif;background:var(--bg);color:#111827}
.header{background:linear-gradient(135deg,var(--p),var(--p2));color:#fff;padding:14px 24px;display:flex;justify-content:space-between;align-items:center;gap:12px;position:sticky;top:0;z-index:10}
.brand{display:flex;gap:12px;align-items:center}.logo{background:#fff;color:var(--p);height:44px;width:44px;border-radius:12px;display:grid;place-items:center;font-weight:900}.brand small{display:block;opacity:.85}
.wrap{max-width:1260px;margin:24px auto;padding:0 16px}.card{background:#fff;border:1px solid var(--b);border-radius:18px;box-shadow:0 10px 30px #14233c12;padding:20px;margin-bottom:18px}
.grid{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media(max-width:850px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.header{flex-direction:column;align-items:flex-start}}
.btn{border:0;border-radius:10px;padding:10px 14px;font-weight:700;cursor:pointer;background:#e5e7eb;color:#111;text-decoration:none;display:inline-block}.btn-primary{background:var(--p2);color:#fff}.btn-accent{background:var(--a);color:#111}.btn-success{background:var(--g);color:#fff}.btn-danger{background:var(--r);color:#fff}.btn-light{background:#fff;color:var(--p)}.btn-small{padding:7px 10px;font-size:13px}
.stat{padding:18px;border-radius:16px;background:linear-gradient(135deg,#eff6ff,#fff);border:1px solid #dbeafe}.stat b{font-size:28px;display:block}.muted{color:#6b7280}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}.tab{padding:10px 14px;border:1px solid var(--b);background:#fff;border-radius:999px;font-weight:700;text-decoration:none;color:#111}.tab.active{background:var(--p);color:#fff}
input,select,textarea{width:100%;padding:11px 12px;border:1px solid var(--b);border-radius:12px;font:inherit;background:#fff}textarea{min-height:110px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}@media(max-width:700px){.form-row{grid-template-columns:1fr}}label{font-weight:700;font-size:14px;margin:10px 0 6px;display:block}.help{font-size:12px;color:#6b7280}
table{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden}th,td{padding:12px;border-bottom:1px solid var(--b);text-align:left;vertical-align:top}th{background:#eef4ff;color:#0f2f5f;font-size:13px}
.pill{display:inline-block;padding:5px 10px;border-radius:999px;font-size:12px;font-weight:800}.pill-green{background:#dcfce7;color:#166534}.pill-red{background:#fee2e2;color:#991b1b}.pill-blue{background:#dbeafe;color:#1e40af}
.login-box{max-width:700px;margin:36px auto}.notice{padding:12px 14px;border-radius:12px;background:#fff7ed;border:1px solid #fed7aa;color:#9a3412}.successbox{padding:12px 14px;border-radius:12px;background:#ecfdf5;border:1px solid #bbf7d0;color:#166534}.dangerbox{padding:12px 14px;border-radius:12px;background:#fef2f2;border:1px solid #fecaca;color:#991b1b}
.exam-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:16px}@media(max-width:980px){.exam-layout{grid-template-columns:1fr}}.timer{font-size:30px;font-weight:900;color:#fff;background:var(--r);padding:12px;border-radius:14px;text-align:center}.question-card{border:1px solid var(--b);border-radius:16px;padding:16px;margin-bottom:14px;background:#fbfdff}.answer-box{min-height:150px}.video-box{background:#050816;border-radius:16px;overflow:hidden;border:4px solid #0f2f5f}video{width:100%;display:block;min-height:210px;background:#111}.overlay{position:fixed;inset:0;background:rgba(127,29,29,.96);color:#fff;z-index:999;display:none;align-items:center;justify-content:center;text-align:center;padding:24px}.progress{height:10px;background:#e5e7eb;border-radius:999px;overflow:hidden}.bar{height:100%;background:var(--g);width:0}.answer-preview{white-space:pre-wrap;max-height:220px;overflow:auto;background:#f8fafc;border-radius:10px;padding:10px;border:1px solid var(--b)}
.footer-note{text-align:center;color:#64748b;font-size:12px;margin:28px 0}@media print{.header,.btn,.footer-note{display:none!important}.wrap{max-width:100%;margin:0}.card{box-shadow:none;border:0}}