*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --border: #334155;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --success: #4ade80;
  --danger: #f87171;
  --radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.status {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.status.loading {
  background: rgba(148, 163, 184, 0.15);
  color: var(--muted);
}

.status.ok {
  background: rgba(74, 222, 128, 0.15);
  color: var(--success);
}

.status.fail {
  background: rgba(248, 113, 113, 0.15);
  color: var(--danger);
}

.info-list {
  list-style: none;
}

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

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

.info-list span {
  color: var(--muted);
}

.counter-display {
  font-size: 3.5rem;
  font-weight: 700;
  text-align: center;
  color: var(--accent);
  margin-bottom: 1rem;
  font-variant-numeric: tabular-nums;
}

.btn-group {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}

.btn:active {
  transform: scale(0.96);
}

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

.btn-secondary {
  background: var(--border);
  color: var(--text);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 1rem;
}