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

:root {
  --primary-color: #1a1a1a;
  --secondary-color: #666;
  --accent-color: #4a90e2;
  --background-color: #fafafa;
  --card-background: #ffffff;
  --border-color: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.05);
  --transition-speed: 0.3s;
}

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background-color: var(--background-color);
  color: var(--primary-color);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.background-decoration {
  position: fixed;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle,
    rgba(74, 144, 226, 0.03) 0%,
    transparent 70%
  );
  animation: float 20s ease-in-out infinite;
  pointer-events: none;
}

@keyframes float {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(-50px, -50px) rotate(180deg);
  }
}

.container {
  width: 100%;
  max-width: 600px;
  padding: 40px 20px;
  position: relative;
  z-index: 1;
}

.header {
  text-align: center;
  margin-bottom: 50px;
  animation: fadeInDown 0.8s ease-out;
}

.title {
  font-size: 2.5rem;
  font-weight: 200;
  letter-spacing: -1px;
  margin-bottom: 10px;
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--accent-color) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1rem;
  color: var(--secondary-color);
  font-weight: 400;
  letter-spacing: 0.5px;
}

.countdown-section {
  background: var(--card-background);
  border-radius: 20px;
  padding: 40px;
  box-shadow: 0 10px 40px var(--shadow-color);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.target-date {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--border-color);
}

.date-label {
  display: block;
  font-size: 0.875rem;
  color: var(--secondary-color);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.date-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-color);
}

.countdown-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.countdown-item {
  text-align: center;
  position: relative;
}

.countdown-value {
  font-size: 3rem;
  font-weight: 200;
  line-height: 1;
  color: var(--primary-color);
  transition: all var(--transition-speed) ease;
  display: inline-block;
}

.countdown-value.pulse {
  animation: pulse 0.5s ease-out;
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.countdown-label {
  font-size: 0.875rem;
  color: var(--secondary-color);
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.progress-container {
  width: 100%;
  height: 4px;
  background-color: var(--border-color);
  border-radius: 2px;
  margin-bottom: 30px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-color), #6bb6ff);
  border-radius: 2px;
  width: 0%;
  transition: width 1s linear;
}

.current-time {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.time-zone {
  display: block;
  font-size: 0.75rem;
  color: var(--secondary-color);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.time-value {
  display: block;
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--primary-color);
  font-variant-numeric: tabular-nums;
}

.footer {
  text-align: center;
  margin-top: 40px;
  animation: fadeIn 0.8s ease-out 0.4s both;
}

.footer-text {
  font-size: 0.875rem;
  color: var(--secondary-color);
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* 响应式设计 */
@media (max-width: 600px) {
  .container {
    padding: 20px 15px;
  }

  .title {
    font-size: 2rem;
  }

  .countdown-section {
    padding: 30px 20px;
  }

  .countdown-grid {
    gap: 15px;
  }

  .countdown-value {
    font-size: 2.5rem;
  }

  .countdown-label {
    font-size: 0.75rem;
  }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #f0f0f0;
    --secondary-color: #999;
    --accent-color: #5aa3f0;
    --background-color: #1a1a1a;
    --card-background: #2a2a2a;
    --border-color: #404040;
    --shadow-color: rgba(0, 0, 0, 0.3);
  }

  .background-decoration {
    background: radial-gradient(
      circle,
      rgba(90, 163, 240, 0.05) 0%,
      transparent 70%
    );
  }
}