:root {
  --bg: #0b1020;
  --card: rgba(255, 255, 255, 0.06);
  --text: #e9eefc;
  --muted: rgba(233, 238, 252, 0.75);
  --accent: #7aa2ff;
  --border: rgba(255, 255, 255, 0.12);
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% 10%, rgba(122, 162, 255, 0.25), transparent 60%),
              radial-gradient(900px 600px at 80% 80%, rgba(255, 122, 200, 0.18), transparent 55%),
              var(--bg);
  display: grid;
  place-items: center;
  padding: 24px;
}

.container {
  width: min(860px, 100%);
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 18px;
  padding: 28px;
  backdrop-filter: blur(10px);
}

.header h1 {
  margin: 0 0 6px 0;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: 0.4px;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

.target {
  margin: 10px 0 0 0;
  font-weight: 600;
  color: var(--accent);
}

.timer {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.tile {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 14px;
  text-align: center;
  background: rgba(0, 0, 0, 0.12);
}

.num {
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 54px);
  font-weight: 800;
  line-height: 1.1;
}

.label {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.status {
  margin: 18px 0 0 0;
  color: var(--muted);
  min-height: 1.2em;
}

.footer {
  margin-top: 18px;
  color: var(--muted);
}

code {
  color: var(--text);
  background: rgba(0, 0, 0, 0.25);
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

@media (max-width: 640px) {
  .timer { grid-template-columns: repeat(2, 1fr); }
}