:root {
  --bg: #0d0f14;
  --card: #161a22;
  --card-2: #1e232d;
  --border: #2a303c;
  --text: #e6e9ef;
  --muted: #8b93a3;
  --accent: #5b8cff;
  --accent-2: #3f6fe0;
  --ok: #3fb950;
  --err: #f85149;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
  background: radial-gradient(1200px 600px at 50% -10%, #1a2030 0%, var(--bg) 60%);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 440px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

header {
  text-align: center;
  margin-bottom: 22px;
}

h1 {
  margin: 0;
  font-size: 30px;
  letter-spacing: -0.5px;
}

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

.tagline {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.field {
  display: block;
  margin-bottom: 14px;
}

.field > span {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input[type="text"] {
  width: 100%;
  padding: 11px 13px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 15px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

select {
  width: 100%;
  padding: 11px 13px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
}

select:focus {
  outline: none;
  border-color: var(--accent);
}

.tabs {
  display: flex;
  gap: 6px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 18px;
}

.tab {
  flex: 1;
  padding: 9px;
  background: transparent;
  border: none;
  border-radius: 7px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.tab.active {
  background: var(--accent);
  color: #fff;
}

.panel.hidden,
.hidden {
  display: none;
}

.drop {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 96px;
  padding: 16px;
  border: 1.5px dashed var(--border);
  border-radius: 12px;
  color: var(--muted);
  cursor: pointer;
  margin-bottom: 16px;
  transition: border-color 0.15s, background 0.15s;
}

.drop:hover,
.drop.over {
  border-color: var(--accent);
  background: rgba(91, 140, 255, 0.06);
  color: var(--text);
}

.code-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  margin-bottom: 16px;
}

.grow {
  flex: 1;
  margin-bottom: 0;
}

button {
  font-family: inherit;
}

.primary {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

.primary:hover:not(:disabled) {
  background: var(--accent-2);
}

.primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.secondary {
  width: 100%;
  margin-top: 8px;
  padding: 12px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

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

.ghost {
  padding: 11px 14px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 16px;
  cursor: pointer;
}

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

.progress-wrap {
  height: 8px;
  background: var(--card-2);
  border-radius: 6px;
  overflow: hidden;
  margin-top: 18px;
}

.progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transition: width 0.15s ease;
}

.status {
  min-height: 20px;
  margin: 12px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

.status.ok {
  color: var(--ok);
}

.status.warn {
  color: #d9a531;
}

.status.err {
  color: var(--err);
}

.foot {
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  max-width: 440px;
}

.foot a {
  color: var(--accent);
  text-decoration: none;
}

/* --- connectivity check page --- */
.card.wide {
  max-width: 560px;
}

.results {
  margin-top: 18px;
}

.check-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}

.check-row strong {
  font-size: 14px;
}

.check-row .detail {
  color: var(--muted);
  font-size: 13px;
  margin-top: 3px;
}

.dot {
  flex: none;
  width: 12px;
  height: 12px;
  margin-top: 3px;
  border-radius: 50%;
  background: var(--border);
}

.dot.pending {
  background: var(--muted);
  animation: pulse 1s ease-in-out infinite;
}
.dot.ok {
  background: var(--ok);
}
.dot.warn {
  background: #d9a531;
}
.dot.err {
  background: var(--err);
}

@keyframes pulse {
  50% {
    opacity: 0.35;
  }
}

.cand-details {
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted);
}

.cand-details summary {
  cursor: pointer;
}

.cand-table {
  width: 100%;
  margin-top: 10px;
  border-collapse: collapse;
  font-family: ui-monospace, Menlo, monospace;
  font-size: 12px;
}

.cand-table th,
.cand-table td {
  text-align: left;
  padding: 5px 8px;
  border-bottom: 1px solid var(--border);
}

.cand-table th {
  color: var(--muted);
  font-weight: 600;
}

.note {
  margin-top: 20px;
  text-align: left;
  line-height: 1.6;
}

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