:root {
  --bg-color: #f5f5f5;
  --text-color: #333;
  --card-bg: white;
  --btn-bg: #0077ff;
  --btn-hover: #005fcc;
}

body.dark {
  --bg-color: #121212;
  --text-color: #f5f5f5;
  --card-bg: #1f1f1f;
  --btn-bg: #0d6efd;
  --btn-hover: #084298;
}

body {
  font-family: Arial, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  text-align: center;
  padding: 20px;
  transition: background 0.3s, color 0.3s;
}

header {
  margin-bottom: 20px;
}

section {
  background: var(--card-bg);
  margin: 15px auto;
  padding: 15px;
  border-radius: 8px;
  width: 320px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.2s, background 0.3s;
}

section:hover {
  transform: scale(1.02);
}

button {
  background: var(--btn-bg);
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 5px;
  transition: background 0.3s;
}

button:hover {
  background: var(--btn-hover);
}

.highlight {
  background-color: yellow;
  font-weight: bold;
  padding: 5px;
  border-radius: 3px;
  transition: background-color 0.3s;
}

.countdown {
  font-size: 2rem;
  margin-top: 10px;
  min-height: 40px;
}

.fade-in {
  animation: fadeIn 1.5s ease-in-out;
}

.slide-down {
  animation: slideDown 1s ease;
}

.fade-item {
  opacity: 0;
  animation: fadeIn 0.5s forwards;
}

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

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