/* 案例展示区块 */
.cases {
    padding: 5rem 5%;
    background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%);
}

.cases-container {
    max-width: 1200px;
    margin: 0 auto;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

/* 案例卡片 */
.case-card {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    opacity: 0;
    transform: scale(0.9) translateY(20px);
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

.case-card:nth-child(1) { transition-delay: 0.1s; }
.case-card:nth-child(2) { transition-delay: 0.2s; }
.case-card:nth-child(3) { transition-delay: 0.3s; }
.case-card:nth-child(4) { transition-delay: 0.4s; }

/* 图片容器 */
.case-image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    overflow: hidden;
}

.case-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease, filter 0.4s ease;
}

.case-card:hover .case-image {
    transform: scale(1.1);
    filter: brightness(0.7);
}

/* 遮罩层 */
.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to top,
        rgba(30, 58, 95, 0.95) 0%,
        rgba(30, 58, 95, 0.6) 50%,
        transparent 100%
    );
    display: flex;
    align-items: flex-end;
    padding: 1.5rem;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.case-card:hover .case-overlay {
    opacity: 1;
}

.case-content {
    transform: translateY(20px);
    transition: transform 0.4s ease;
}

.case-card:hover .case-content {
    transform: translateY(0);
}

.case-content h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: #ffffff;
    margin-bottom: 0.5rem;
    font-weight: 700;
    line-height: 1.3;
}

.case-content p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.5;
    margin: 0;
}

/* 案例标题 */
.cases-title {
    text-align: center;
    margin-bottom: 3rem;
}

.cases-title h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.cases-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #1e3a5f, #c9a961);
    border-radius: 2px;
}

.cases-title p {
    font-size: 1.1rem;
    color: #6b7280;
    margin-top: 1.5rem;
}