/* Hello Jerry - 深蓝科技风主题 */
:root {
  --bg-primary: #0f172a;       /* slate-900 */
  --bg-card: #1e293b;          /* slate-800 */
  --primary: #38bdf8;          /* sky-400 */
  --text-white: #f8fafc;       /* slate-50 */
  --text-muted: #94a3b8;       /* slate-400 */
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

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

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-white);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  line-height: 1.6;
}

#app {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-radius: 1.25rem;
  box-shadow: var(--shadow);
  padding: 3rem 2.5rem;
  text-align: center;
  max-width: 520px;
  width: 100%;
}

.title {
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-white);
  margin-bottom: 1.5rem;
}

.clock {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 375px) {
  .card {
    padding: 2rem 1.5rem;
  }
  .title {
    font-size: 2.25rem;
  }
  .subtitle {
    font-size: 1rem;
  }
}