/* ===== 合作案例页面样式 ===== */

/* ===== 案例分类筛选区 ===== */
.cases-filter-section {
    padding: var(--spacing-5xl) var(--spacing-lg);
    background: var(--color-white);
}

.filter-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.filter-header h2 {
    font-size: var(--font-size-h2);
    color: var(--color-dark);
    margin-bottom: var(--spacing-base);
    font-weight: var(--font-weight-bold);
}

.filter-header p {
    font-size: 18px;
    color: var(--color-gray);
    font-weight: var(--font-weight-semibold);
}

.filter-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.filter-btn {
    padding: 12px 24px;
    border: 2px solid var(--color-light);
    border-radius: var(--radius-lg);
    background: var(--color-white);
    color: var(--color-gray);
    font-size: 15px;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    z-index: -1;
    transition: left var(--transition-base);
}

.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.filter-btn:hover::before {
    left: 0;
}

.filter-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: 0 8px 24px rgba(0, 102, 204, 0.3);
}

.filter-btn.active::before {
    left: 0;
}

/* ===== 案例展示网格 ===== */
.cases-showcase {
    padding: var(--spacing-5xl) var(--spacing-lg);
    background: linear-gradient(180deg, var(--color-white) 0%, #f8fbff 100%);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-3xl);
}

.case-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 102, 204, 0.08);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.8s ease-out both;
    opacity: 0;
}

.case-card.show {
    opacity: 1;
}

.case-card:nth-child(1) { animation-delay: 0.1s; }
.case-card:nth-child(2) { animation-delay: 0.2s; }
.case-card:nth-child(3) { animation-delay: 0.3s; }
.case-card:nth-child(4) { animation-delay: 0.4s; }
.case-card:nth-child(5) { animation-delay: 0.5s; }
.case-card:nth-child(6) { animation-delay: 0.6s; }
.case-card:nth-child(7) { animation-delay: 0.7s; }
.case-card:nth-child(8) { animation-delay: 0.8s; }
.case-card:nth-child(9) { animation-delay: 0.9s; }
.case-card:nth-child(10) { animation-delay: 1s; }
.case-card:nth-child(11) { animation-delay: 1.1s; }
.case-card:nth-child(12) { animation-delay: 1.2s; }

.case-card:hover {
    box-shadow: 0 20px 60px rgba(0, 102, 204, 0.25);
    transform: translateY(-12px);
}

.case-image {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
    background: var(--color-light);
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.case-card:hover .case-image img {
    transform: scale(1.1);
}

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 102, 204, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 10;
}

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

.case-overlay .btn {
    position: relative;
    z-index: 11;
}

.case-content {
    padding: var(--spacing-2xl);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.case-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-white);
    padding: 4px 12px;
    border-radius: var(--radius-base);
    font-size: 12px;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-lg);
    width: fit-content;
    letter-spacing: 0.5px;
}

.case-card h3 {
    font-size: 20px;
    color: var(--color-dark);
    margin-bottom: var(--spacing-base);
    font-weight: var(--font-weight-bold);
    line-height: 1.4;
}

.case-desc {
    font-size: 15px;
    color: var(--color-gray);
    line-height: 1.6;
    margin-bottom: var(--spacing-2xl);
    flex-grow: 1;
}

.case-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-light);
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 24px;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: 4px;
}

.stat-label {
    display: block;
    font-size: 13px;
    color: var(--color-gray);
    font-weight: var(--font-weight-semibold);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-2xl);
    }

    .filter-buttons {
        gap: var(--spacing-base);
    }

    .filter-btn {
        padding: 10px 18px;
        font-size: 14px;
    }
}

@media (max-width: 768px) {
    .cases-showcase {
        padding: var(--spacing-3xl) var(--spacing-base);
    }

    .cases-filter-section {
        padding: var(--spacing-3xl) var(--spacing-base);
    }

    .cases-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .filter-header {
        margin-bottom: var(--spacing-3xl);
    }

    .filter-header h2 {
        font-size: 24px;
    }

    .filter-header p {
        font-size: 14px;
    }

    .filter-buttons {
        flex-direction: column;
        gap: var(--spacing-base);
    }

    .filter-btn {
        width: 100%;
        padding: 12px 16px;
    }

    .case-image {
        height: 200px;
    }

    .case-content {
        padding: var(--spacing-lg);
    }

    .case-tag {
        font-size: 11px;
        padding: 3px 10px;
    }

    .case-card h3 {
        font-size: 18px;
    }

    .case-desc {
        font-size: 14px;
    }

    .stat-value {
        font-size: 20px;
    }

    .stat-label {
        font-size: 12px;
    }
}