:root {
  --bg: #0B1120;
  --surface: #131A2A;
  --surface-2: #1B2437;
  --border: #263049;
  --text: #F8FAFC;
  --text-dim: #97A3BC;
  --accent: #4C6EF5;
  --accent-contrast: #4266F4;
  --green: #22C55E;
  --amber: #F59E0B;
  --red: #EF4444;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

a { color: var(--accent); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.site-header img { height: 32px; width: auto; display: block; }

.btn {
  display: inline-block;
  padding: 12px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.btn-primary { background: var(--accent-contrast); border-color: var(--accent-contrast); color: #fff; }

.auth { padding: 32px 20px 64px; display: flex; justify-content: center; }

.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.auth-card h1 { margin: 0 0 8px; font-size: 24px; }
.auth-sub { margin: 0 0 20px; color: var(--text-dim); }
.auth-alt { margin: 12px 0 0; color: var(--text-dim); font-size: 14px; }

label { display: block; margin: 14px 0 6px; font-size: 14px; font-weight: 600; }
.opt { color: var(--text-dim); font-weight: 400; }

input[type="text"], input[type="email"], input[type="password"], input[type="url"], select {
  width: 100%;
  padding: 12px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font: inherit;
}

input:focus, select:focus, .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.hint { margin: 6px 0 0; color: var(--text-dim); font-size: 13px; }
form .btn { width: 100%; margin-top: 20px; }

.alert { padding: 12px 14px; border-radius: 10px; font-size: 14px; }
.alert-error { background: rgba(239, 68, 68, 0.12); border: 1px solid var(--red); color: #FECACA; }
.alert-ok { background: rgba(34, 197, 94, 0.12); border: 1px solid var(--green); color: #BBF7D0; }

.hero { padding: 48px 20px; max-width: 720px; margin: 0 auto; text-align: left; }
.hero h1 { font-size: 32px; line-height: 1.2; margin: 0 0 16px; }
.hero p { color: var(--text-dim); font-size: 18px; margin: 0 0 28px; }
.hero .btn { margin-right: 12px; }

.steps { list-style: none; margin: 40px 0 0; padding: 0; display: grid; gap: 16px; }
.steps li { padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.steps b { display: block; margin-bottom: 6px; }

.site-footer { padding: 24px 20px; border-top: 1px solid var(--border); color: var(--text-dim); font-size: 14px; }

@media (min-width: 768px) {
  .hero { padding: 80px 24px; }
  .hero h1 { font-size: 44px; }
  .steps { grid-template-columns: repeat(3, 1fr); }
}