* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #1e1e2f, #2b2b45);
  display: flex;
  justify-content: center;
  align-items: center;
  color: #222;
}

/* Card */
.tabs-card {
  width: 440px;
  padding: 32px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  box-shadow: 0 30px 60px rgba(0,0,0,0.35);
}

.tabs-card h1 {
  text-align: center;
  margin-bottom: 6px;
}

.subtitle {
  text-align: center;
  font-size: 14px;
  color: #666;
  margin-bottom: 25px;
}

/* Tabs */
.tabs {
  position: relative;
  display: flex;
  background: #f1f1f5;
  padding: 6px;
  border-radius: 14px;
  margin-bottom: 25px;
}

.tab {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px;
  cursor: pointer;
  z-index: 1;
  font-weight: 500;
  transition: color 0.3s ease;
}

.tab.active {
  color: white;
}

/* Sliding indicator */
.indicator {
  position: absolute;
  top: 6px;
  left: 6px;
  width: calc(33.333% - 6px);
  height: calc(100% - 12px);
  background: linear-gradient(135deg, #667eea, #764ba2);
  border-radius: 12px;
  transition: transform 0.35s ease;
}

/* Content */
.contents {
  min-height: 120px;
}

.content {
  display: none;
  animation: fadeUp 0.35s ease;
}

.content.active {
  display: block;
}

.content h2 {
  margin-bottom: 8px;
}

.content p,
.content li {
  font-size: 14px;
  color: #444;
}

.content ul {
  padding-left: 18px;
}

/* Animation */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}