:root {
  color-scheme: light dark;
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Segoe UI", sans-serif;
  --bg: #0f172a;
  --card: rgba(15, 23, 42, 0.72);
  --accent: #38bdf8;
  --text: #e2e8f0;
  --muted: #94a3b8;
}

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

body {
  min-height: 100vh;
  background: radial-gradient(circle at top, #1e293b 0%, var(--bg) 65%);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
}

.clock-page {
  width: min(680px, 92vw);
}

.clock-card {
  padding: 48px 40px;
  border-radius: 28px;
  background: var(--card);
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(148, 163, 184, 0.2);
  display: grid;
  gap: 16px;
  text-align: center;
}

.clock-label {
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.clock-time {
  font-size: clamp(2.8rem, 8vw, 5rem);
  font-weight: 600;
  color: var(--accent);
  text-shadow: 0 0 24px rgba(56, 189, 248, 0.4);
}

.clock-date {
  font-size: 1.2rem;
  letter-spacing: 0.08em;
}

.clock-meta {
  font-size: 1rem;
  color: var(--muted);
}

@media (max-width: 480px) {
  .clock-card {
    padding: 36px 24px;
  }
}