:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --border: #dfe3e8;
  --text: #1c2024;
  --muted: #6b7280;
  --accent: #2f6feb;
  --danger: #c92a2a;
}

* {
  box-sizing: border-box;
}

/* View switching relies on `hidden`; layout rules below must never win over it. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  padding: 0 1rem 3rem;
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei',
    sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 0 1rem;
}

.topbar h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

main {
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

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

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.hint {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0 0 0.75rem;
}

label {
  display: block;
  margin: 0.75rem 0 0.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}

input,
select {
  font: inherit;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: inherit;
}

input[type='text'],
input[type='password'] {
  flex: 1;
  min-width: 0;
}

button {
  font: inherit;
  padding: 0.45rem 0.85rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.secondary {
  background: #fff;
  color: var(--text);
  border-color: var(--border);
}

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

form button[type='submit'] {
  margin-top: 1rem;
}

.row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.row.space-between {
  justify-content: space-between;
}

.notice {
  margin-top: 1rem;
  padding: 0.75rem;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: #eef3fe;
}

.notice p {
  margin: 0 0 0.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  text-align: left;
  padding: 0.5rem 0.4rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

td.actions {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

td.actions button,
td.actions select {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-size: 0.78rem;
  background: #e9ecef;
}

.badge.active {
  background: #d3f9d8;
  color: #2b8a3e;
}

.badge.expired {
  background: #fff3bf;
  color: #a06d00;
}

.badge.revoked {
  background: #ffe3e3;
  color: var(--danger);
}

/* Login view: a single narrow card, comfortably usable on a phone. */
.login-view {
  max-width: 26rem;
  margin: 0 auto;
  padding-top: 3rem;
  display: block;
}

.login-card h1 {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
}

.login-card label {
  margin-top: 0;
}

.login-card input[type='password'] {
  display: block;
  width: 100%;
}

.login-card button[type='submit'] {
  width: 100%;
  padding: 0.6rem 0.85rem;
}

.login-error {
  margin: 0.75rem 0 0;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--danger);
  border-radius: 6px;
  color: var(--danger);
  font-size: 0.875rem;
}

.login-note {
  margin: 1rem 0 0;
}

.topbar .row.space-between {
  align-items: flex-start;
}

.status {
  max-width: 960px;
  margin: 1rem auto 0;
  min-height: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.status[data-kind='error'] {
  color: var(--danger);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --card: #1c1f24;
    --border: #33383f;
    --text: #e8eaed;
    --muted: #9aa3ad;
  }

  input,
  select {
    background: #14161a;
    color: var(--text);
  }

  button.secondary {
    background: #14161a;
    color: var(--text);
  }

  .notice {
    background: #1b2536;
  }
}