/* ==========================================
   1. 粒子星河背景 + 文字显形（最新优化版）
   ========================================== */
.vfx-particle-text-wrap {
    width: 100%;
    position: relative;
    overflow: hidden;
    background: #0a0a20;
}
.vfx-particle-canvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
}
.vfx-particle-overlay {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}
.vfx-particle-overlay h2 {
    font-size: 5vw;
    color: rgba(255, 255, 255, 0.5);     /* 文字半透明 */
    margin: 0;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    transition: color 0.5s, text-shadow 0.5s;
}

/* ==========================================
   2. 3D 翻转卡片矩阵（初始稳定版）
   ========================================== */
.vfx-3d-cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}
.vfx-flip-card {
    background: transparent;
    perspective: 1200px;
    height: 250px;
}
.vfx-flip-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}
.vfx-flip-card:hover .vfx-flip-inner {
    transform: rotateY(180deg);
}
.vfx-flip-front, .vfx-flip-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 12px;
    overflow: hidden;
}
.vfx-flip-front { background: #111; }
.vfx-flip-front img { width: 100%; height: 100%; object-fit: cover; }
.vfx-flip-back {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}
.vfx-flip-back h3 { margin: 0 0 10px; font-size: 22px; font-weight: 700; }
.vfx-flip-back p { margin: 0; font-size: 15px; opacity: 0.9; }
.vfx-flip-card:hover .vfx-flip-inner {
    box-shadow: 0 0 25px rgba(102,126,234,0.8), 0 0 50px rgba(118,75,162,0.5);
}

/* 自动翻动时的翻转效果 */
.vfx-flip-inner.auto-flip {
    transform: rotateY(180deg);
}


/* 响应式 */
@media (max-width: 900px) {
    .vfx-3d-cards-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 500px) {
    .vfx-3d-cards-grid { grid-template-columns: 1fr; }
}