:root{--navy:#0B1B3F;--blue:#1D4ED8;--blue-dark:#1E3A8A;--sky:#93C5FD;--tone:#F59E0B;--bg:#FFFFFF;--surface:#FFFFFF;--soft:#F3F7FF;--line:#E2E8F4;--line-2:#C9D3E6;--text:#0B1B3F;--muted:#5B6B8C;--text-2:#33415C;--ok:#047857;--ok-soft:#ECFDF5;--err:#B91C1C;--err-soft:#FEF2F2;--radius:14px}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:IBM Plex Sans Thai,system-ui,sans-serif;line-height:1.6}a{color:var(--blue)}a:hover{color:var(--blue-dark)}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--sky);outline-offset:2px}@media (max-width:640px){h1{font-size:36px!important}}.wrap{max-width:1280px;margin:0 auto;padding:0 24px}.narrow{max-width:640px;margin:0 auto;padding:48px 24px 72px}.top{border-bottom:1px solid var(--line);background:var(--surface)}.top .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;padding-top:14px;padding-bottom:14px}.logo{display:flex;align-items:baseline;text-decoration:none;font-weight:700;font-size:26px;letter-spacing:-.5px;line-height:1}.logo .l{color:var(--navy)}.logo .r{position:relative;color:var(--blue);margin-left:4px}.logo .r svg{position:absolute;left:50%;top:-15px;width:11px;height:15px;transform:translateX(-10%)}.logo .c{color:var(--muted);font-size:16px;font-weight:600;margin-left:2px}.top nav{margin-left:auto;display:flex;flex-wrap:wrap;align-items:center;gap:8px}.navlink{font-size:15px;color:var(--text-2);text-decoration:none;padding:10px 12px}.avatar{width:32px;height:32px;border-radius:50%;background:var(--soft);object-fit:cover}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border-radius:10px;border:1px solid var(--blue);background:var(--blue);color:#fff;font:inherit;font-weight:600;font-size:15px;text-decoration:none;cursor:pointer}.btn:hover{background:var(--blue-dark);color:#fff}.btn.ghost{background:transparent;color:var(--blue)}.btn.ghost:hover{background:var(--soft);color:var(--blue-dark)}.btn[disabled]{opacity:.55;cursor:not-allowed}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:18px}.field label{font-weight:600;font-size:15px}.field .hint{color:var(--muted);font-size:13.5px}.input{display:flex;align-items:center;border:1px solid var(--line-2);border-radius:10px;background:#fff;overflow:hidden}.input span{padding:0 0 0 12px;color:var(--muted);font-size:15px;white-space:nowrap}.input input,textarea{flex:1;min-width:0;border:0;padding:11px 12px;font:inherit;font-size:15px;color:var(--text);background:transparent;outline:none}textarea{border:1px solid var(--line-2);border-radius:10px;resize:vertical;min-height:88px}.msg{font-size:14px}.msg.ok{color:var(--ok)}.msg.err{color:var(--err)}.notice{border-radius:12px;padding:12px 16px;font-size:14.5px;margin-bottom:18px}.notice.err{background:var(--err-soft);color:var(--err)}.notice.ok{background:var(--ok-soft);color:var(--ok)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.muted{color:var(--muted)}.profile-head{display:flex;flex-wrap:wrap;gap:20px;align-items:center;padding:48px 0 24px}.profile-head img{width:88px;height:88px;border-radius:50%;object-fit:cover;background:var(--soft)}.profile-head h1{margin:0;font-size:32px}.empty{border:1px dashed var(--line-2);border-radius:var(--radius);padding:40px 24px;text-align:center;color:var(--muted)}.foot{background:var(--navy);color:#C7D6F5;margin-top:0}.foot .wrap{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;padding-top:32px;padding-bottom:32px;font-size:14px}.foot a{color:#C7D6F5;text-decoration:none}.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}.subject-card{display:flex;flex-direction:column;gap:6px;text-decoration:none;color:var(--text);min-height:140px}.subject-card:hover{border-color:var(--blue);color:var(--text)}.subject-title{font-size:18px;font-weight:700}.subject-desc{font-size:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.lesson-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}.lesson-row{gap:12px;padding:16px 20px}.lesson-row,.token-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between}.token-row{gap:10px;padding:10px 0;border-top:1px solid var(--line)}.codebox{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-family:ui-monospace,Consolas,monospace;font-size:13px;word-break:break-all;white-space:pre-wrap}.admin-badge{background:var(--navy);color:#fff;font-size:12px;font-weight:700;padding:3px 8px;border-radius:6px;letter-spacing:.3px}.admin-nav{margin-left:auto}.admin-nav .navlink[aria-current=page]{color:var(--blue);font-weight:700}.admin-main{padding-top:32px;padding-bottom:64px}.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}.stat{padding:18px 20px}.stat-n{font-size:30px;font-weight:700;color:var(--navy);line-height:1.3}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}.admin-table{width:100%;border-collapse:collapse;font-size:14.5px}.admin-table th{text-align:left;background:var(--soft);font-weight:600;padding:10px 12px;white-space:nowrap}.admin-table td{padding:10px 12px;border-top:1px solid var(--line);vertical-align:top}.admin-table tr.suspended td{background:var(--err-soft)}.btn.sm{min-height:34px;padding:0 12px;font-size:14px}.btn.danger{color:var(--err)}.setting{padding-bottom:16px;border-bottom:1px solid var(--line)}.setting:last-child{border-bottom:0;padding-bottom:0;margin-bottom:0}.input select{flex:1;min-width:0;border:0;padding:11px 12px;font:inherit;font-size:15px;background:transparent;outline:none}.announce{background:var(--tone);color:var(--navy);text-align:center;font-size:14.5px;font-weight:600;padding:8px 16px}.prose h1{margin:0 0 4px}.prose h2{font-size:20px;margin:28px 0 8px}.prose li,.prose p{font-size:15.5px;line-height:1.75;color:var(--text-2)}.prose ul{padding-left:22px;margin:0 0 12px}.prose li{margin-bottom:6px}