:root {
  color-scheme: light dark;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --border: #e1e4e8;
  --text: #1c2126;
  --muted: #5b6570;
  --accent: #2b6cb0;
  --danger: #c0392b;
  --ok: #1e7e34;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar .brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.topbar nav a {
  margin-left: 1.25rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
}

.topbar nav a:hover { color: var(--accent); }

.topbar nav .user {
  margin-left: 1.25rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.topbar nav .logout-form {
  display: inline;
  margin-left: 0.5rem;
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 400;
  cursor: pointer;
  text-decoration: underline;
}

.login-card {
  max-width: 360px;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
}

h1 { font-size: 1.4rem; margin-bottom: 1rem; }
h2 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

table.kv th {
  text-align: left;
  width: 160px;
  color: var(--muted);
  font-weight: 600;
  background: var(--bg);
}

table th, table td {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  text-align: left;
}

table.list th {
  background: var(--bg);
  color: var(--muted);
}

tr.revoked td { opacity: 0.6; }

tr:last-child td { border-bottom: none; }

.mono { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 0.85rem; }

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge.valid { background: #e6f4ea; color: var(--ok); }
.badge.revoked { background: #fbeae8; color: var(--danger); }

.empty { color: var(--muted); }

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 700px) {
  .cards { grid-template-columns: 1fr; }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.hint { color: var(--muted); font-size: 0.85rem; margin-top: -0.4rem; }

form label {
  display: block;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--muted);
}

form input, form textarea {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
}

form textarea { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }

button, .button {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.55rem 1rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

button.danger { background: var(--danger); }

.actions { margin-top: 1.25rem; display: flex; gap: 0.75rem; align-items: center; }
.actions form { margin: 0; }

.error {
  background: #fbeae8;
  color: var(--danger);
  border: 1px solid #f3c8c3;
  border-radius: 6px;
  padding: 0.6rem 0.9rem;
  font-size: 0.9rem;
}