:root{--blue:#0799dc;--dark:#17212d;--muted:#657080;--bg:#f5f7fa;--line:#e4e9ef}*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;color:var(--dark);background:#fff}.placeholder{max-width:760px;margin:15vh auto;padding:40px}.placeholder a,button{background:var(--blue);color:#fff;border:0;border-radius:8px;padding:12px 18px;text-decoration:none}.admin-bg{background:var(--bg);min-height:100vh;display:grid;place-items:center}.login-card{width:min(420px,92vw);background:#fff;padding:32px;border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 50px #00000010}.login-card label{display:block;margin:16px 0}.login-card input:not([type=hidden]){display:block;width:100%;padding:12px;margin-top:6px;border:1px solid var(--line);border-radius:8px}.login-card button{width:100%}.error{padding:10px;background:#fff1f1;color:#a10000;border-radius:8px}.admin-shell{display:grid;grid-template-columns:250px 1fr;min-height:100vh}.admin-shell aside{padding:28px;background:#121b25;color:#fff}.admin-shell nav{display:grid;gap:8px;margin-top:28px}.admin-shell nav a,.admin-shell nav span{color:#dce6ef;text-decoration:none;padding:10px;border-radius:8px}.admin-shell main{padding:32px}.admin-top{display:flex;justify-content:space-between;align-items:center}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:30px}.cards>div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}@media(max-width:800px){.admin-shell{grid-template-columns:1fr}.admin-shell aside{display:none}.cards{grid-template-columns:1fr 1fr}}