/* ===================================================
   cases.css — 产品案例页面专属样式
   核力科技（上海）有限公司

   包含：Hero、行业筛选、案例网格、详情弹窗、CTA
   不含：Header、Nav、Mobile Nav、Footer、Loader、Back-to-Top、Buttons
         （这些已在 shared.css 中）
   =================================================== */

/* ===================================================
   Hero Banner — 产品案例页首屏
   =================================================== */
.cases-hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(180deg, #0a1628 0%, #0f2847 50%, #1a365d 100%);
    overflow: hidden;
    padding-top: 5rem;
}

/* 科技感背景网格 */
.cases-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 0;
}

/* 光晕效果 */
.cases-hero::after {
    content: '';
    position: absolute;
    top: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.15) 0%, rgba(0, 212, 170, 0.08) 40%, transparent 70%);
    border-radius: 50%;
    animation: pulse-glow 8s ease-in-out infinite;
    z-index: 0;
}

@keyframes pulse-glow {
    0%, 100% { opacity: 0.8; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.1); }
}

.cases-hero-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
    z-index: 1;
}

.cases-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 102, 255, 0.2);
    color: #00D4AA;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(0, 212, 170, 0.3);
}

.cases-hero-title {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #FFFFFF 0%, #00D4AA 50%, #0066FF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease;
}

.cases-hero-subtitle {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
    animation: fadeInUp 1s ease 0.2s backwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================================
   行业筛选栏
   =================================================== */
.cases-filter {
    padding: 3rem 2rem 1rem;
    background: var(--dark);
}

.cases-filter-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.filter-btn {
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(0, 102, 255, 0.1);
}

.filter-btn.active {
    background: var(--gradient-1);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
}

/* ===================================================
   案例网格
   =================================================== */
.cases-grid-section {
    padding: 2rem 2rem 6rem;
    background: var(--dark);
}

.cases-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

/* ---------- 案例卡片 ---------- */
.case-card {
    background: var(--dark-light);
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.case-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(0, 102, 255, 0.2);
}

/* 卡片顶部渐变条 */
.case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.case-card:hover::before {
    transform: scaleX(1);
}

/* 案例图片区域 */
.case-card-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.08) 0%, rgba(0, 212, 170, 0.05) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.case-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* SVG 占位图 */
.case-placeholder-svg {
    width: 100%;
    height: 100%;
}

/* 行业标签（图片右上角） */
.case-card-industry {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(0, 102, 255, 0.9);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
}

/* 卡片内容区 */
.case-card-content {
    padding: 1.5rem;
}

.case-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.case-card-client {
    font-size: 0.85rem;
    color: var(--secondary);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.case-card-summary {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.case-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.case-card-tag {
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    transition: all 0.3s ease;
}

.case-card:hover .case-card-tag {
    background: rgba(0, 102, 255, 0.15);
    color: rgba(255, 255, 255, 0.9);
}

/* ---------- 无结果提示 ---------- */
.cases-empty {
    text-align: center;
    padding: 4rem 2rem;
    color: rgba(255, 255, 255, 0.5);
    font-size: 1.1rem;
    grid-column: 1 / -1;
}

.cases-empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* ===================================================
   案例详情弹窗（Modal）
   =================================================== */
.case-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.case-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.case-modal {
    background: white;
    border-radius: 24px;
    max-width: 800px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    transform: translateY(30px) scale(0.95);
    transition: all 0.3s ease;
}

.case-modal-overlay.active .case-modal {
    transform: translateY(0) scale(1);
}

.case-modal-close {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: rgba(0, 0, 0, 0.06);
    color: var(--dark);
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10;
    line-height: 1;
}

.case-modal-close:hover {
    background: rgba(0, 0, 0, 0.12);
    transform: rotate(90deg);
}

.case-modal-header {
    padding: 2.5rem 2.5rem 0;
}

.case-modal-industry {
    display: inline-block;
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary);
    padding: 0.3rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.case-modal-title {
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--dark);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.case-modal-client {
    font-size: 1rem;
    color: var(--gray);
    margin-bottom: 1.5rem;
}

.case-modal-body {
    padding: 2rem 2.5rem 2.5rem;
}

.case-modal-section {
    margin-bottom: 2rem;
}

.case-modal-section:last-child {
    margin-bottom: 0;
}

.case-modal-section-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.case-modal-section-title .section-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.case-modal-section-title .section-icon.challenge {
    background: rgba(239, 68, 68, 0.1);
}

.case-modal-section-title .section-icon.solution {
    background: rgba(0, 102, 255, 0.1);
}

.case-modal-section-title .section-icon.result {
    background: rgba(0, 212, 170, 0.1);
}

.case-modal-section p {
    color: var(--gray);
    line-height: 1.8;
    font-size: 0.95rem;
}

.case-modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #E2E8F0;
}

.case-modal-tag {
    background: var(--light);
    color: var(--dark);
    padding: 0.35rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* ===================================================
   CTA 行动引导
   =================================================== */
.cases-cta {
    padding: 6rem 2rem;
    background: white;
    text-align: center;
}

.cases-cta-inner {
    max-width: 700px;
    margin: 0 auto;
}

.cases-cta-title {
    font-size: 2.25rem;
    font-weight: 900;
    color: var(--dark);
    margin-bottom: 1rem;
}

.cases-cta-desc {
    color: var(--gray);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.cases-cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}



/* ===================================================
   Responsive 响应式
   =================================================== */
@media (max-width: 1024px) {
    .cases-hero-title {
        font-size: 2.5rem;
    }

    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

}

@media (max-width: 768px) {
    .cases-hero {
        min-height: auto;
        padding-top: 6rem;
        padding-bottom: 2rem;
    }

    .cases-hero-title {
        font-size: 2.2rem;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .cases-cta-title {
        font-size: 1.75rem;
    }

    .case-modal {
        max-height: 90vh;
        border-radius: 16px;
    }

    .case-modal-header {
        padding: 2rem 1.5rem 0;
    }

    .case-modal-body {
        padding: 1.5rem;
    }

    .case-modal-title {
        font-size: 1.4rem;
    }

}

@media (max-width: 480px) {
    .cases-hero-inner {
        padding: 2rem 1rem;
    }

    .cases-hero-title {
        font-size: 1.8rem;
    }

    .cases-filter-inner {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }

    .cases-grid-section {
        padding: 1rem 1rem 4rem;
    }

    .case-card-content {
        padding: 1.25rem;
    }

    .section-title {
        font-size: 1.8rem;
    }
}