:root {
  --navy: #0c1222;
  --charcoal: #1a2332;
  --text: #334155;
  --text-muted: #64748b;
  --bg: #ffffff;
  --bg-subtle: #f8fafc;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #b91c1c;
  --danger-bg: #fef2f2;
  --radius: 8px;
  --font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg-subtle);
  -webkit-font-smoothing: antialiased;
}

.admin-header {
  background: var(--navy);
  color: #fff;
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.admin-header .brand {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.admin-header .brand span {
  color: #93c5fd;
  font-weight: 500;
}

.admin-main {
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1.25rem;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: 0 4px 16px rgba(12, 18, 34, 0.06);
}

.card h1 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  color: var(--navy);
}

.card .subtitle {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
}

.alert-error {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid #fecaca;
}

.field {
  margin-bottom: 1rem;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.35rem;
  color: var(--charcoal);
}

.field input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
}

.field input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.btn {
  display: inline-block;
  font: inherit;
  font-weight: 600;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: #cbd5e1;
  border: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 0.875rem;
  padding: 0.4rem 0.75rem;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.tool-links {
  margin: 0 0 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.tool-links .btn-primary {
  width: auto;
}

.tool-links-note {
  margin: 0.65rem 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.meta-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.meta-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.9rem;
}

.meta-list li:last-child {
  border-bottom: none;
}

.meta-list .label {
  color: var(--text-muted);
}

.footer-note {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}