/* 3D Tilt Card - 3D 倾斜卡片 */
/* 依赖: 需要少量 JS 来追踪鼠标位置，纯 CSS 也可用:hover做简单版 */

/* 纯 CSS 版 - hover 时轻微倾斜 */
.tilt-card {
  perspective: 1000px;
  display: inline-block;
}

.tilt-card__inner {
  transition: transform 0.4s cubic-bezier(0.03, 0.98, 0.52, 0.99);
  transform-style: preserve-3d;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  border-radius: 20px;
  padding: 2.5rem;
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  overflow: hidden;
}

.tilt-card__inner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.08), transparent 50%);
  transform: translateZ(-1px);
}

.tilt-card:hover .tilt-card__inner {
  transform: rotateY(-5deg) rotateX(5deg) translateZ(20px);
  box-shadow: 
    20px 20px 60px rgba(0, 0, 0, 0.3),
    -5px -5px 20px rgba(99, 102, 241, 0.1);
}

/* JS 增强版 - 跟随鼠标倾斜 */
.tilt-card--js .tilt-card__inner {
  will-change: transform;
}

/* 卡片内元素的 3D 深度 */
.tilt-card__shine {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1) 0%,
    transparent 50%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
  border-radius: 20px;
}

.tilt-card:hover .tilt-card__shine {
  opacity: 1;
}

.tilt-card__icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: block;
  transform: translateZ(30px);
}

.tilt-card__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  transform: translateZ(20px);
}

.tilt-card__desc {
  font-size: 0.9rem;
  opacity: 0.7;
  line-height: 1.6;
  transform: translateZ(10px);
}

/* 变体 */
.tilt-card--gradient .tilt-card__inner {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  color: #fff;
  border: none;
}

.tilt-card--glass .tilt-card__inner {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}