/* ================= 5. 页面内容区块 ================= */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.3)), url('/css/img/hx2.jpg') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-align: center;
    margin-top: 0;
}
.hero-content h1 { font-size: 64px; margin-bottom: 20px; }
.hero-content p { font-size: 24px; opacity: 0.9; max-width: 800px; margin: 0 auto; }

.section { padding: 100px 0; }
.section-title { text-align: center; font-size: 36px; margin-bottom: 60px; }

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.card {
    background: var(--light-bg);
    border-radius: 16px;
    overflow: hidden;
    transition: 0.4s;
}
.card:hover { transform: translateY(-10px); box-shadow: 0 20px 40px rgba(0,0,0,0.1); }
.card-img { height: 240px; background: #ddd; width: 100%; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.card-body { padding: 30px; }
.card-body h3 { margin-bottom: 15px; }
.card-body p { color: var(--gray); font-size: 15px; }

.cta { background: #0066cc; color: #fff; padding: 12px 35px; text-decoration: none; border-radius: 30px; font-weight: 600; display: inline-block; margin-top: 20px; }




.section {
    padding: 100px 5%;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.tech-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: all var(--transition-speed);
    position: relative;
    cursor: pointer;
    /* 初始隐藏，用于滚动动画 */
    opacity: 0;
    transform: translateY(50px);
}

.tech-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.tech-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--card-hover-shadow);
}

.card-img-wrapper {
    height: 250px;
    overflow: hidden;
    position: relative;
}

.card-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.tech-card:hover .card-img-wrapper img {
    transform: scale(1.1);
}

.card-content {
    padding: 30px;
}

.card-content h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.card-content p {
    color: var(--text-gray);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.card-link {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
}

.card-link::after {
    content: '→';
    margin-left: 8px;
    transition: transform 0.3s;
}

.tech-card:hover .card-link::after {
    transform: translateX(5px);
}