:root {
  color-scheme: light dark;
  --bg: #f4f6fa;
  --bg-accent: radial-gradient(1200px 500px at 10% -10%, #e0e7ff 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #ccfbf1 0%, transparent 50%);
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: rgba(15, 23, 42, 0.12);
  --text: #0f172a;
  --muted: #64748b;
  --accent: #0f766e;
  --accent-hover: #0d9488;
  --accent-soft: rgba(15, 118, 110, 0.12);
  --danger: #be123c;
  --danger-soft: rgba(190, 18, 60, 0.1);
  --ok: #047857;
  --ok-soft: rgba(4, 120, 87, 0.1);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 12px 40px rgba(15, 23, 42, 0.08);
  --radius: 14px;
  --font: "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --bg-accent: radial-gradient(1200px 500px at 10% -10%, #1e1b4b 0%, transparent 55%),
      radial-gradient(900px 400px at 100% 0%, #134e4a 0%, transparent 50%);
    --surface: #111827;
    --surface-2: #0f172a;
    --border: rgba(148, 163, 184, 0.18);
    --text: #e2e8f0;
    --muted: #94a3b8;
    --accent: #2dd4bf;
    --accent-hover: #5eead4;
    --accent-soft: rgba(45, 212, 191, 0.15);
    --danger: #fb7185;
    --danger-soft: rgba(251, 113, 133, 0.12);
    --ok: #34d399;
    --ok-soft: rgba(52, 211, 153, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 18px 50px rgba(0, 0, 0, 0.45);
  }
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  background-image: var(--bg-accent);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.brand h1 {
  margin: 0;
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 36rem;
}

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

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--muted);
  white-space: nowrap;
}

.badge.secure {
  border-color: rgba(4, 120, 87, 0.35);
  background: var(--ok-soft);
  color: var(--ok);
}

.badge.warn {
  border-color: rgba(190, 18, 60, 0.35);
  background: var(--danger-soft);
  color: var(--danger);
}

.tls-banner {
  margin-bottom: 1.25rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  font-size: 0.92rem;
}

.tls-banner strong {
  color: var(--text);
}

.tls-banner code {
  font-family: var(--mono);
  font-size: 0.85em;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.35rem 1.35rem 1.15rem;
  margin-bottom: 1.25rem;
}

.card h2 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.card .hint {
  margin: 0 0 1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

label.field {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 1rem;
  margin-bottom: 0.4rem;
}

label.field:first-of-type {
  margin-top: 0;
}

textarea,
input[type="text"] {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.88rem;
  padding: 0.65rem 0.75rem;
  line-height: 1.45;
  resize: vertical;
  min-height: 6.5rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea#msg {
  min-height: 5.5rem;
}

textarea:focus,
input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.check {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
  cursor: pointer;
}

.check input {
  margin-top: 0.25rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.15rem;
}

button {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
}

button:active {
  transform: translateY(1px);
}

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

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

.btn-ghost {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.82rem;
}

.flash-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.flash {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.92rem;
  border: 1px solid var(--border);
}

.flash.ok {
  background: var(--ok-soft);
  border-color: rgba(4, 120, 87, 0.25);
  color: var(--text);
}

.flash.fail {
  background: var(--danger-soft);
  border-color: rgba(190, 18, 60, 0.25);
  color: var(--text);
}

.flash.warn {
  background: rgba(180, 130, 20, 0.12);
  border-color: rgba(180, 130, 20, 0.35);
  color: var(--text);
}

@media (prefers-color-scheme: dark) {
  .flash.warn {
    background: rgba(251, 191, 36, 0.1);
    border-color: rgba(251, 191, 36, 0.32);
  }
}

.section-title {
  margin: 2rem 0 0.65rem;
  font-size: 1.1rem;
  font-weight: 700;
}

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th,
td {
  padding: 0.55rem 0.75rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
  background: var(--surface-2);
}

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

tbody tr:hover td {
  background: rgba(15, 118, 110, 0.04);
}

@media (prefers-color-scheme: dark) {
  tbody tr:hover td {
    background: rgba(45, 212, 191, 0.06);
  }
}

.cell-ok {
  color: var(--ok);
  font-weight: 700;
}

.cell-fail {
  color: var(--danger);
  font-weight: 700;
}

code.inline {
  font-family: var(--mono);
  font-size: 0.86em;
  padding: 0.1em 0.35em;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.rejected textarea {
  min-height: 4rem;
  margin-top: 0.35rem;
}

.footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
}

.footer code {
  font-family: var(--mono);
  font-size: 0.92em;
}

.meta-links {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.35rem;
}

.auth-wrap {
  max-width: 28rem;
}

.auth-title {
  margin: 0 0 0.3rem;
  font-size: 1.35rem;
}