:root{--bg:#f4f6fb;--card:#fff;--ink:#0f172a;--mut:#64748b;--pri:#2563eb;--pri2:#1e40af;--line:#e2e8f0}
*{box-sizing:border-box}body{margin:0;font-family:'IBM Plex Sans Thai',system-ui,sans-serif;background:var(--bg);color:var(--ink);font-size:15px}
.top{display:flex;align-items:center;gap:24px;background:#0f172a;color:#fff;padding:12px 24px}
.brand{display:flex;gap:8px;align-items:center;font-weight:600}.top nav{flex:1;display:flex;gap:16px}
.top a{color:#cbd5e1;text-decoration:none}.top a:hover{color:#fff}.who small{color:#94a3b8}
.wrap{max-width:1100px;margin:24px auto;padding:0 16px}.center{min-height:100vh;display:grid;place-items:center;padding:16px;align-content:center}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px;box-shadow:0 4px 20px rgba(15,23,42,.05);width:100%;max-width:420px}
.wrap .card{max-width:none;margin-bottom:20px}.wrap .card.narrow{max-width:520px}
h1{font-size:20px;margin:0 0 4px}p.sub{color:var(--mut);margin:0 0 18px}
label{display:block;font-weight:500;margin:14px 0 6px}
input,select{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;background:#fff}
input:focus,select:focus{outline:2px solid #bfdbfe;border-color:var(--pri)}
button{margin-top:18px;background:var(--pri);color:#fff;border:0;border-radius:8px;padding:10px 16px;font:inherit;font-weight:500;cursor:pointer}
button:hover{background:var(--pri2)}button.link{background:none;margin:0 0 0 12px;padding:0;color:#93c5fd}
button.sm{margin:0;padding:5px 10px;font-size:13px}button.gray{background:#64748b}
.alert{padding:10px 14px;border-radius:8px;margin-bottom:16px;max-width:420px;width:100%}
.wrap .alert{max-width:none}.alert.ok{background:#dcfce7;color:#14532d}.alert.err{background:#fee2e2;color:#7f1d1d}
table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:10px;border-bottom:1px solid var(--line)}th{color:var(--mut);font-weight:500;font-size:13px}
.tabs{display:flex;gap:8px;margin-bottom:8px}.tabs a{padding:6px 12px;border-radius:999px;text-decoration:none;color:var(--mut);background:#eef2ff}.tabs a.on{background:var(--pri);color:#fff}
.badge{font-size:12px;padding:2px 8px;border-radius:999px;background:#e0e7ff;color:#3730a3}.badge.off{background:#fee2e2;color:#991b1b}