* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 30% 20%, color-mix(in srgb, var(--theme-color) 25%, var(--bg-color)) 0%, var(--bg-color) 60%);
  color: var(--text-color);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  padding: 24px;
}

.countdown-wrap {
  text-align: center;
  max-width: 640px;
  width: 100%;
}

.logo {
  max-height: 72px;
  margin-bottom: 20px;
}

h1 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  margin: 0 0 8px;
  font-weight: 700;
}

.subtitle {
  opacity: 0.75;
  margin: 0 0 36px;
  font-size: clamp(0.95rem, 2vw, 1.15rem);
}

.countdown-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.unit {
  background: color-mix(in srgb, var(--text-color) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--text-color) 15%, transparent);
  border-radius: 16px;
  padding: 20px 8px;
  backdrop-filter: blur(6px);
}

.unit span {
  display: block;
  font-size: clamp(1.8rem, 6vw, 3rem);
  font-weight: 800;
  color: var(--theme-color);
  line-height: 1;
}

.unit label {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.7;
}

.finished-message {
  font-size: clamp(1.3rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--theme-color);
  margin-top: 20px;
}

@media (max-width: 480px) {
  .countdown-grid {
    gap: 8px;
  }
  .unit {
    padding: 14px 4px;
    border-radius: 12px;
  }
}