*{box-sizing:border-box}body{margin:0;font:15px/1.5 "Segoe UI",system-ui,sans-serif;background:#f6f8fc;color:#1c2333}
.app{display:flex;min-height:100vh}.side{width:260px;background:#fff;padding:16px 20px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;border-radius:0 18px 18px 0;box-shadow:0 0 24px #1d4ed80d;flex-shrink:0}
.brand{display:flex;align-items:center;gap:10px;margin-bottom:22px;font-size:18px}.brand img{height:34px}.lg{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:#1d4ed8;color:#fff;font-weight:700}
.side nav{display:flex;flex-direction:column;gap:4px;flex:1}.side nav a{display:flex;gap:12px;align-items:center;padding:11px 14px;border-radius:10px;color:#1c2333;text-decoration:none}.side nav a:hover{background:#f1f5fd}.side nav a.on{background:#e6eeff;color:#1d4ed8;font-weight:600}
.usr{display:flex;gap:10px;align-items:center;background:#f4f6fb;border-radius:12px;padding:10px}.usr i{font-style:normal;display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:#2563eb;color:#fff;font-weight:700;font-size:13px}
.content{flex:1;min-width:0}.tb{display:flex;align-items:center;gap:12px;padding:16px 24px}.tb h1{font-size:18px;margin:0;flex:1}.out{color:#dc2626;text-decoration:none;font-size:22px}.burger{display:none;font-size:22px;cursor:pointer}
main{max-width:1200px;margin:0 auto;padding:0 24px 24px}
@media(max-width:800px){.side{display:none;position:fixed;z-index:20;left:0;top:0}#mt:checked~.side{display:flex}.burger{display:block}main{padding:0 12px 24px}.tb{padding:12px}}
.card{background:#fff;border-radius:14px;padding:16px;margin-bottom:14px;box-shadow:0 1px 3px #0001}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-bottom:18px}
.stat{position:relative;overflow:hidden;border-radius:14px;padding:20px;color:#dbe7ff;background:linear-gradient(135deg,#2563eb,#1d4ed8)}.stat b{display:block;font-size:30px;color:#fff;line-height:1.2}.stat i{position:absolute;right:14px;bottom:6px;font-style:normal;font-size:52px;opacity:.25}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid #d5dce8;border-radius:10px;font:inherit;margin:4px 0 10px;background:#fff}
input[type=checkbox],input[type=radio]{width:auto;margin:0 8px 0 0}
.btn{background:#2563eb;color:#fff;border:0;border-radius:10px;padding:10px 18px;cursor:pointer;font:inherit;text-decoration:none;display:inline-block}.btn.sm{padding:4px 10px;font-size:13px}.red{background:#dc2626}.gray{background:#64748b}.grn{background:#16a34a}
.ox{overflow-x:auto;border:1px solid #e5e9f2;border-radius:12px;background:#fff;margin-bottom:14px}table{border-collapse:collapse;width:100%}th,td{padding:12px 14px;border-bottom:1px solid #eef1f6;text-align:left;font-size:14px}th{background:#f8fafd;font-size:12px;text-transform:uppercase;color:#475569}
.bd{padding:3px 10px;border-radius:99px;font-size:12px;white-space:nowrap}.gn{background:#dcfce7;color:#166534}.bl{background:#dbeafe;color:#1e40af}.gr{background:#e5e7eb;color:#374151}
.msg{background:#dcfce7;padding:10px 14px;border-radius:10px;margin-bottom:12px}.warn{background:#fef3c7}
/* login */
.lgn{min-height:100vh;display:grid;place-items:center;padding:20px;background:radial-gradient(ellipse 60% 22% at 12% 92%,#fff 0,#fff0 70%),radial-gradient(ellipse 70% 26% at 80% 98%,#fff 0,#fff0 70%),radial-gradient(ellipse 40% 14% at 50% 80%,#ffffffb0 0,#fff0 70%),linear-gradient(#8ec9ee,#bfe2f6 45%,#eef6fc 85%)}
.lgn .br{position:fixed;top:28px;left:5vw;display:flex;gap:10px;align-items:center;font-weight:700;font-size:20px}.lgn .br span,.lgn .br img{width:40px;height:40px;border-radius:12px;background:#1c1c28;color:#fff;display:grid;place-items:center;object-fit:cover}
.lc{width:100%;max-width:410px;text-align:center;padding:36px 32px 30px;border-radius:30px;background:linear-gradient(#c9f3ff,#fff 38%);box-shadow:0 20px 50px #3b82c633,0 0 0 1px #ffffffb0}
.lc .ic{width:62px;height:62px;margin:0 auto 22px;border-radius:18px;background:#f4f8fb;display:grid;place-items:center;font-size:26px;box-shadow:0 6px 14px #0002}.lc h2{margin:0 0 6px;font-size:25px}.lc p{margin:0 0 24px;color:#6b7385}
.fi{display:flex;align-items:center;gap:10px;background:#f1f3f8;border-radius:14px;padding:0 14px;margin-bottom:12px}.fi input{border:0;background:none;margin:0;padding:14px 0;outline:0}.fi span{color:#7b8499;cursor:default}.fi .eye{cursor:pointer}
.fg{display:block;text-align:right;color:#222;font-size:14px;margin:-2px 0 18px;text-decoration:none}
.lc button{width:100%;padding:15px;border:0;border-radius:15px;color:#fff;font:600 16px inherit;cursor:pointer;background:linear-gradient(#2b2b3c,#14141e);box-shadow:inset 0 0 0 1px #fff3}
.lc small{display:block;margin-top:18px;color:#7b8499}.lc .msg{text-align:left;font-size:14px}
/* ujian */
.ov{position:fixed;inset:0;background:#0f172af0;display:flex;align-items:center;justify-content:center;z-index:99;padding:16px}.ov[hidden]{display:none}.ov .card{max-width:440px;text-align:center}
.bar{display:flex;justify-content:space-between;align-items:center;gap:8px;background:#fff;padding:10px 14px;border-radius:12px;margin-bottom:12px;position:sticky;top:0;z-index:2}
.ex{display:grid;grid-template-columns:1fr 220px;gap:12px}@media(max-width:760px){.ex{grid-template-columns:1fr}}
.qt img,.opt img{max-width:100%;height:auto}.qt{margin-bottom:12px}
.opt{display:flex;align-items:flex-start;padding:10px;border:1px solid #cbd5e1;border-radius:8px;margin:6px 0;cursor:pointer}.opt.on{border-color:#2563eb;background:#eff6ff}
#nav{display:flex;flex-wrap:wrap;gap:6px;align-content:flex-start}#nav button{width:38px;height:38px;border:1px solid #cbd5e1;border-radius:8px;background:#fff;cursor:pointer}#nav .d{background:#16a34a;color:#fff}#nav .c{outline:2px solid #2563eb}