*{box-sizing:border-box}html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Helvetica,Arial}
:root{--blue:#2563eb;--blue-600:#1d4ed8;--bg:#f5f7fb;--card:#fff;--text:#111827;--muted:#6b7280}
body{background:var(--bg);color:var(--text)}
.container{max-width:960px;margin:0 auto;padding:20px}
.site-header{background:linear-gradient(135deg,var(--blue),var(--blue-600));color:#fff;padding:20px 0}
.header-flex{display:flex;align-items:flex-end;justify-content:space-between;gap:12px}
.brand{color:#fff;text-decoration:none;font-weight:700;font-size:22px}
.subtitle{opacity:.85;font-size:12px}
.nav a{color:#eaf2ff;margin-left:12px;text-decoration:none}
.nav .btn{background:#fff;color:var(--blue);padding:6px 12px;border-radius:10px;font-weight:600}
.card{background:var(--card);border-radius:14px;box-shadow:0 10px 24px rgba(0,0,0,.06);padding:24px;margin-top:18px}
.card h2{margin-top:0}.narrow{max-width:420px;margin:18px auto}
label{display:block;margin:10px 0 6px}
input{width:100%;padding:10px;border:1px solid #e5e7eb;border-radius:10px}
button.btn,.btn{display:inline-block;background:var(--blue);color:#fff;border:none;padding:10px 16px;border-radius:10px;cursor:pointer;text-decoration:none}
.alert{background:#fff7ed;border:1px solid #fdba74;color:#9a3412;border-radius:10px;padding:10px;margin:10px 0}
.muted{color:var(--muted)}.site-footer{padding:24px 0;color:#94a3b8;text-align:center}