:root{--bg:#0f1115;--ink:#e6edf3;--muted:#9aa4b2;--line:#202637;--accent:#1f7aec}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
.wrap{max-width:860px;margin:0 auto;padding:24px}
.site-header{border-bottom:1px solid var(--line);background:#0b0d12}
.logo a{color:var(--ink);text-decoration:none;font-weight:800}
nav ul{list-style:none;margin:0;padding:0;display:flex;gap:14px}
nav a{color:#cbd5e1;text-decoration:none}
nav a:hover{color:#fff}
.card{border:1px solid var(--line);border-radius:14px;padding:16px;background:#12151b}
.signup-card{max-width:520px;margin:24px auto}
.form input,.form select,.form textarea{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:#0b0d12;color:var(--ink)}
.form label{display:block;margin:10px 0 6px;color:#cbd5e1;font-size:14px}
.field-help{color:var(--muted);font-size:12px;margin-top:6px}
.notice{padding:10px 12px;border-radius:10px;margin:12px 0;font-size:14px}
.notice.error{background:#2a0e0e;border:1px solid #5d1c1c;color:#fecaca}
.btn{display:inline-block;border-radius:10px;padding:10px 14px;border:1px solid var(--line);background:#0b0d12;color:#fff;text-decoration:none;cursor:pointer}
.btn.primary{background:linear-gradient(180deg,#1f7aec,#1457b4);border:0}
.btn:hover{opacity:.92}
.mt-lg{margin-top:18px}
.text-center{text-align:center}
.linkish{color:#93c5fd;text-decoration:none}
.linkish:hover{text-decoration:underline}