:root{color-scheme:dark;--ink:#001f2b;--panel:#003846;--aqua:#35d8df;--coral:#ff4d5a;--text:#f5ffff;--muted:#afd1d3;--line:rgba(95,220,224,.24)}
*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 16% 12%,#075a67 0,transparent 30%),linear-gradient(135deg,#001f2b,#00313d);font:15px "DM Sans",system-ui,sans-serif;color:var(--text)}.admin-shell{width:min(680px,calc(100% - 32px));margin:0 auto;padding:52px 0}.back-link{color:var(--aqua);text-decoration:none;font-weight:700}.admin-card{margin-top:22px;padding:clamp(25px,5vw,44px);border:1px solid var(--line);border-radius:24px;background:rgba(0,49,61,.88);box-shadow:0 24px 60px rgba(0,0,0,.35)}.eyebrow{margin:0 0 8px;color:var(--aqua);font-size:11px;font-weight:800;letter-spacing:1.6px}.admin-card h1{margin:0;font-size:clamp(34px,7vw,48px);letter-spacing:-2px}.intro{margin:10px 0 28px;color:var(--muted);line-height:1.5}.login-form,.settings-form{display:grid;gap:17px}.login-form label,.announcement-label{display:grid;gap:7px;font-size:12px;font-weight:700;color:#cceced}input,textarea{width:100%;border:1px solid var(--line);border-radius:11px;padding:12px;background:#002b36;color:var(--text);outline-color:var(--aqua)}textarea{min-height:100px;resize:vertical;line-height:1.45}button{border:0;border-radius:11px;padding:13px 16px;background:var(--coral);color:white;font:inherit;font-weight:800;cursor:pointer;transition:transform .2s ease,filter .2s ease}button:hover{transform:translateY(-2px);filter:brightness(1.08)}.setting-row{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:17px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.setting-row b,.setting-row span{display:block}.setting-row span{margin-top:5px;color:var(--muted);font-size:13px;line-height:1.4}.switch{position:relative;flex:none;width:50px;height:29px}.switch input{position:absolute;opacity:0}.switch span{position:absolute;inset:0;margin:0;border-radius:999px;background:#1a5560;cursor:pointer}.switch span:after{content:"";position:absolute;top:4px;left:4px;width:21px;height:21px;border-radius:50%;background:#fff;transition:transform .2s}.switch input:checked+span{background:var(--aqua)}.switch input:checked+span:after{transform:translateX(21px)}small{color:var(--muted);font-weight:400}.actions{display:flex;gap:10px;flex-wrap:wrap}.secondary{background:transparent;border:1px solid var(--line);color:#d8f5f5}.message{min-height:22px;margin:20px 0 0;color:var(--aqua);font-size:13px}.message.error{color:#ff9da4}@media (max-width:500px){.admin-shell{padding-top:28px}.admin-card{padding:24px}.setting-row{align-items:flex-start}.actions>*{width:100%}}