/* ==============================================================
   格引创科技 - AI智能营销网站 主样式表
   设计风格: 京东/天猫电商风格 (红+白)
   策略: 手机优先 (Mobile-First) → 自适应 PC/平板
   ============================================================== */

/* ==================== CSS Variables ==================== */
:root {
    /* 品牌色 - 京东红 */
    --color-primary: #C91623;
    --color-primary-dark: #A0121D;
    --color-primary-light: #FF4D4F;
    --color-primary-bg: #FFF1F0;

    /* 中性色 */
    --color-text: #222222;
    --color-text-secondary: #666666;
    --color-text-light: #999999;
    --color-bg: #FFFFFF;
    --color-bg-gray: #F5F5F5;
    --color-bg-dark: #1A1A1A;
    --color-border: #E8E8E8;
    --color-border-light: #F0F0F0;

    /* 功能色 */
    --color-success: #52C41A;
    --color-warning: #FAAD14;
    --color-info: #1890FF;

    /* 尺寸 */
    --max-width: 1200px;
    --header-height: 56px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --shadow-card: 0 2px 12px rgba(0,0,0,0.06);

    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 13px;
    --font-size-base: 15px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 22px;
    --font-size-2xl: 28px;
    --font-size-3xl: 36px;
}

/* ==================== Reset ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ==================== Container ==================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
}

/* ==================== Header ==================== */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
    backdrop-filter: blur(10px);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 800;
}

.nav-desktop { display: none; }

.nav-desktop .nav-link {
    padding: 6px 14px;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.nav-desktop .nav-link:hover,
.nav-desktop .nav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-bg);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-search {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--color-bg-gray);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
}

.btn-contact {
    display: none;
    padding: 8px 16px;
    background: var(--color-primary);
    color: white;
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    white-space: nowrap;
}

.btn-menu {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 24px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px;
}

.btn-menu span {
    display: block;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all 0.3s;
}

/* Search Overlay */
.search-overlay {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
}

.search-overlay.active { display: block; }

.search-bar-container {
    display: flex;
    gap: 8px;
}

.search-input {
    flex: 1;
    padding: 10px 16px;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    outline: none;
}

.search-close {
    border: none;
    background: var(--color-bg-gray);
    border-radius: var(--radius-md);
    padding: 0 16px;
    cursor: pointer;
    font-size: 18px;
    color: var(--color-text-secondary);
}

/* Mobile Navigation */
.nav-mobile {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    padding: 16px;
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-lg);
    z-index: 99;
}

.nav-mobile.active { display: flex; flex-direction: column; gap: 4px; }

.nav-mobile .nav-link {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-md);
    color: var(--color-text);
}

.nav-mobile .nav-link:hover { background: var(--color-bg-gray); }
.nav-mobile .nav-link.highlight { color: var(--color-primary); font-weight: 600; }

/* ==================== Hero Banner ==================== */
.hero-banner {
    background: linear-gradient(135deg, #FFF5F5 0%, #FFFFFF 50%, #FFF1F0 100%);
    padding: 40px 0 60px;
    overflow: hidden;
    position: relative;
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
    position: relative;
    z-index: 2;
}

.hero-content { text-align: center; max-width: 600px; margin: 0 auto; }

.hero-title {
    font-size: 28px;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    color: var(--color-text);
}

.hero-title .highlight {
    color: var(--color-primary);
    display: block;
}

.hero-subtitle {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    margin-bottom: 28px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    margin-bottom: 32px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(201,22,35,0.3); }

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    background: white;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-outline:hover { background: var(--color-primary-bg); }

.btn-lg { padding: 14px 36px; font-size: var(--font-size-lg); }

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 24px;
    font-weight: 800;
    color: var(--color-primary);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

/* Hero Visual (Desktop) */
.hero-visual { display: none; }

/* ==================== Sections ==================== */
section { padding: 48px 0; }

.section-header {
    text-align: center;
    margin-bottom: 32px;
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--color-text);
}

.section-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.section-more {
    display: inline-block;
    margin-top: 12px;
    font-size: var(--font-size-sm);
    color: var(--color-primary);
}

.section-more:hover { text-decoration: underline; }

/* ==================== Features Grid ==================== */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.feature-card {
    padding: 24px;
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    text-align: center;
    transition: all 0.3s;
}

.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--color-primary-light); }

.feature-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ==================== Articles Grid ==================== */
.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.article-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    transition: all 0.3s;
    display: block;
}

.article-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.card-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    background: var(--color-bg-gray);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.article-card:hover .card-image img { transform: scale(1.05); }

.card-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    background: linear-gradient(135deg, #FFF5F5, #FFE8E8);
}

.card-body {
    padding: 14px;
}

.card-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

.card-summary {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    gap: 12px;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

.card-type {
    display: inline-block;
    padding: 2px 8px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    border-radius: 4px;
    font-size: var(--font-size-xs);
    margin-bottom: 6px;
}

/* ==================== Video Grid ==================== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.video-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    cursor: pointer;
    transition: all 0.3s;
}

.video-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.video-cover {
    position: relative;
    aspect-ratio: 3 / 4;
    background: var(--color-bg-gray);
    overflow: hidden;
}

.video-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-cover .play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 48px;
    height: 48px;
    background: rgba(0,0,0,0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-info {
    padding: 10px 12px;
}

.video-info h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-likes, .video-stats {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

/* ==================== Cases Grid ==================== */
.cases-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.case-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    transition: all 0.3s;
    display: block;
}

.case-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.case-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 12px;
    background: var(--color-primary);
    color: white;
    border-radius: 4px;
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.case-tags {
    display: flex;
    gap: 8px;
    font-size: var(--font-size-xs);
    color: var(--color-primary);
    margin-top: 4px;
}

/* ==================== Keyword Cloud ==================== */
.section-keywords { background: var(--color-bg-gray); }

.keyword-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    padding: 20px 0;
}

.keyword-tag {
    display: inline-block;
    padding: 8px 16px;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: all 0.2s;
    white-space: nowrap;
}

.keyword-tag:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: var(--color-primary-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* ==================== CTA Section ==================== */
.section-cta { padding: 32px 0 64px; }

.cta-banner {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-xl);
    padding: 36px 24px;
    text-align: center;
    color: white;
}

.cta-content h2 {
    font-size: var(--font-size-xl);
    margin-bottom: 8px;
}

.cta-content p {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    margin-bottom: 24px;
}

.cta-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.cta-banner .btn-primary {
    background: white;
    color: var(--color-primary);
}

.cta-banner .btn-primary:hover { background: #FFF1F0; }

.cta-banner .btn-outline {
    border-color: rgba(255,255,255,0.5);
    color: white;
    background: transparent;
}

.cta-divider {
    font-size: var(--font-size-sm);
    opacity: 0.7;
}

/* ==================== Float Buttons ==================== */
.cta-float {
    position: fixed;
    bottom: 80px;
    left: 16px;
    right: 16px;
    z-index: 90;
}

.cta-float .cta-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(201,22,35,0.4);
    transition: all 0.2s;
}

.cta-float .cta-btn:hover { transform: translateY(-2px); }

.chatbot-float {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 89;
    transition: all 0.3s;
}

.chatbot-float:hover { transform: scale(1.1); }

/* ==================== Recommend Section ==================== */
.section-recommend { background: var(--color-bg-gray); }

.recommend-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

/* ==================== Page Templates ==================== */
.page-container { padding: 24px 16px 48px; max-width: var(--max-width); margin: 0 auto; }

.page-header {
    text-align: center;
    margin-bottom: 28px;
}

.page-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-bottom: 8px;
}

.page-header p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* Filter Bar */
.filter-bar {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 0 0 20px;
    -webkit-overflow-scrolling: touch;
}

.filter-btn {
    padding: 8px 16px;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
}

.filter-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Load More */
.load-more-container { text-align: center; padding: 32px 0; }

.btn-load-more {
    padding: 10px 40px;
    background: var(--color-bg-gray);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.btn-load-more:hover { background: var(--color-border-light); }

/* ==================== Article Detail ==================== */
.article-detail { padding: 16px 0 48px; }

.breadcrumb {
    max-width: var(--max-width);
    margin: 0 auto 20px;
    padding: 0 16px;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    display: flex;
    gap: 8px;
    align-items: center;
}

.breadcrumb a { color: var(--color-primary); }
.breadcrumb a:hover { text-decoration: underline; }

.article-container {
    max-width: 750px;
    margin: 0 auto;
    padding: 0 16px;
}

.article-header { margin-bottom: 24px; }

.article-title {
    font-size: var(--font-size-xl);
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 12px;
}

.article-meta {
    display: flex;
    gap: 16px;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

.article-cover {
    margin: 20px -16px;
}

.article-cover img {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
}

.article-content {
    font-size: var(--font-size-md);
    line-height: 1.9;
    color: var(--color-text);
    word-break: break-word;
}

.article-content h2 {
    font-size: var(--font-size-xl);
    margin: 28px 0 14px;
    padding-left: 12px;
    border-left: 4px solid var(--color-primary);
}

.article-content h3 {
    font-size: var(--font-size-lg);
    margin: 20px 0 10px;
}

.article-content p {
    margin-bottom: 14px;
    color: #333;
}

.article-content ul, .article-content ol {
    padding-left: 20px;
    margin-bottom: 14px;
}

.article-content li { margin-bottom: 6px; }

.article-content img {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin: 16px 0;
}

/* Article Footer CTA */
.article-footer-cta { margin-top: 40px; }

.cta-box {
    background: linear-gradient(135deg, #FFF5F5, #FFF1F0);
    border: 2px solid var(--color-primary-light);
    border-radius: var(--radius-lg);
    padding: 28px;
    text-align: center;
}

.cta-box h3 { font-size: var(--font-size-lg); margin-bottom: 8px; }
.cta-box p { font-size: var(--font-size-sm); color: var(--color-text-secondary); margin-bottom: 20px; }

.cta-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.cta-buttons .btn-primary, .cta-buttons .btn-outline {
    justify-content: center;
}

/* Related Articles */
.related-articles { margin-top: 40px; }

.related-articles h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 16px;
}

/* Case Metrics */
.case-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 32px;
    background: var(--color-bg-gray);
    border-radius: var(--radius-lg);
    padding: 20px;
}

.metric-item { text-align: center; }

.metric-value {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--color-primary);
}

.metric-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

.case-gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 24px;
}

.case-gallery img {
    width: 100%;
    border-radius: var(--radius-md);
    aspect-ratio: 1;
    object-fit: cover;
}

.case-type-badge {
    display: inline-block;
    padding: 4px 14px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    border-radius: 4px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: 12px;
}

/* ==================== Search Page ==================== */
.search-bar-inline {
    display: flex;
    gap: 8px;
    max-width: 500px;
    margin: 16px auto 0;
}

.search-input-page {
    flex: 1;
    padding: 10px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    outline: none;
}

.search-input-page:focus { border-color: var(--color-primary); }

.search-hint { margin-top: 12px; font-size: var(--font-size-sm); color: var(--color-text-light); }

.search-results { display: flex; flex-direction: column; gap: 12px; }

.search-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 16px;
    transition: all 0.2s;
    display: block;
}

.search-item:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-sm);
}

.search-item-type {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    margin-bottom: 6px;
}

.search-item h3 { font-size: var(--font-size-base); margin-bottom: 4px; }
.search-item p { font-size: var(--font-size-sm); color: var(--color-text-secondary); }

/* ==================== Error Pages ==================== */
.error-page {
    text-align: center;
    padding: 80px 20px;
}

.error-code {
    font-size: 80px;
    font-weight: 900;
    color: var(--color-primary);
    opacity: 0.2;
}

.error-msg {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin: 16px 0 32px;
}

/* ==================== Video Modal ==================== */
.video-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.9);
    z-index: 200;
    align-items: center;
    justify-content: center;
}

.video-modal.active { display: flex; }

.video-modal-content {
    width: 90vw;
    max-width: 600px;
    position: relative;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

.video-player {
    aspect-ratio: 9 / 16;
    background: black;
    border-radius: var(--radius-md);
    overflow: hidden;
}

/* ==================== Skeleton Loading ==================== */
.skeleton {
    pointer-events: none;
}

.skeleton-image {
    background: linear-gradient(90deg, var(--color-bg-gray) 25%, #EEE 50%, var(--color-bg-gray) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    aspect-ratio: 16/9;
}

.skeleton-line {
    height: 14px;
    background: linear-gradient(90deg, var(--color-bg-gray) 25%, #EEE 50%, var(--color-bg-gray) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
    margin-bottom: 8px;
}

.w-80 { width: 80%; }
.w-60 { width: 60%; }
.w-40 { width: 40%; }

@keyframes shimmer {
    from { background-position: 200% 0; }
    to { background-position: -200% 0; }
}

/* Loading Dots */
.loading-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 40px;
}

.loading-dots span {
    width: 10px;
    height: 10px;
    background: var(--color-border);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    grid-column: 1 / -1;
}

/* ==================== Footer ==================== */
.app-footer {
    background: var(--color-bg-dark);
    color: #BBB;
    padding: 40px 0 20px;
}

.footer-container { max-width: var(--max-width); margin: 0 auto; padding: 0 16px; }

.footer-grid { display: grid; grid-template-columns: 1fr; gap: 28px; margin-bottom: 28px; }

.footer-col h4 {
    color: white;
    font-size: var(--font-size-base);
    margin-bottom: 12px;
}

.footer-desc {
    font-size: var(--font-size-sm);
    line-height: 1.7;
    margin-bottom: 12px;
}

.footer-contact p {
    font-size: var(--font-size-xs);
    margin-bottom: 4px;
}

.footer-col a {
    display: block;
    font-size: var(--font-size-sm);
    color: #BBB;
    padding: 4px 0;
    transition: color 0.2s;
}

.footer-col a:hover { color: white; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
    padding: 4px 12px;
    background: rgba(255,255,255,0.08);
    border-radius: 12px;
    font-size: var(--font-size-xs);
}

.tag:hover { background: var(--color-primary); color: white; }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 16px;
    text-align: center;
    font-size: var(--font-size-xs);
}

.icp { margin-top: 4px; opacity: 0.6; }

/* ==================== Tablet (≥768px) ==================== */
@media (min-width: 768px) {
    :root { --header-height: 64px; }

    .container { padding: 0 24px; }

    .hero-title { font-size: 36px; }
    .hero-subtitle { font-size: var(--font-size-lg); }
    .hero-cta { flex-direction: row; justify-content: center; }

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

    .articles-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }

    .video-grid { grid-template-columns: repeat(4, 1fr); gap: 16px; }

    .cases-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }

    .recommend-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }

    .footer-grid { grid-template-columns: repeat(3, 1fr); }

    .cta-float { left: auto; right: 24px; width: auto; }
    .cta-float .cta-btn { width: auto; padding: 14px 28px; border-radius: 28px; }

    .cta-buttons { flex-direction: row; justify-content: center; }

    .case-metrics { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
    .case-gallery { grid-template-columns: repeat(3, 1fr); }

    .cta-banner { padding: 48px 40px; }
}

/* ==================== Desktop (≥1024px) ==================== */
@media (min-width: 1024px) {
    :root { --header-height: 72px; }

    .btn-menu { display: none; }
    .nav-desktop { display: flex; align-items: center; gap: 4px; }
    .btn-contact { display: block; }

    .hero-banner { padding: 80px 0 100px; }

    .hero-container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        align-items: center;
        gap: 60px;
    }

    .hero-content { text-align: left; }

    .hero-title { font-size: 48px; }

    .hero-cta { justify-content: flex-start; }

    .hero-stats { justify-content: flex-start; gap: 40px; }

    .hero-visual {
        display: block;
        position: relative;
    }

    .hero-shape {
        width: 400px;
        height: 400px;
        background: radial-gradient(circle, var(--color-primary-bg) 0%, transparent 70%);
        border-radius: 50%;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }

    .hero-mockup {
        position: relative;
        z-index: 2;
    }

    .mockup-screen {
        background: white;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        padding: 20px;
        max-width: 360px;
        margin: 0 auto;
    }

    .mockup-dots {
        display: flex;
        gap: 6px;
        margin-bottom: 16px;
    }

    .mockup-dots span {
        width: 10px;
        height: 10px;
        border-radius: 50%;
        background: var(--color-border);
    }

    .mockup-chart {
        display: flex;
        align-items: flex-end;
        gap: 12px;
        height: 120px;
        padding: 8px;
    }

    .mockup-chart .bar {
        flex: 1;
        background: var(--color-bg-gray);
        border-radius: 4px 4px 0 0;
        transition: all 0.3s;
    }

    .mockup-chart .bar.active {
        background: linear-gradient(to top, var(--color-primary), var(--color-primary-light));
    }

    .features-grid { grid-template-columns: repeat(4, 1fr); gap: 24px; }

    .articles-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; }

    .cases-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; }

    .recommend-grid { grid-template-columns: repeat(4, 1fr); gap: 24px; }

    .article-title { font-size: var(--font-size-3xl); }
    .article-content { font-size: var(--font-size-lg); }

    .cta-banner { display: flex; align-items: center; justify-content: space-between; text-align: left; }
    .cta-content h2 { font-size: var(--font-size-2xl); }
    .cta-actions { flex-direction: row; }

    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

/* ==================== Large Desktop (≥1200px) ==================== */
@media (min-width: 1200px) {
    .hero-title { font-size: 56px; }

    .section-features { padding: 80px 0; }
    .section-articles { padding: 80px 0; }
    .section-douyin { padding: 80px 0; }
    .section-cases { padding: 80px 0; }
}

/* ==================== Hero Badge & Trust ==================== */
.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: 16px;
}

.hero-trust {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 24px;
}

.trust-item {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

/* Hero Window Visual */
.hero-window {
    position: relative;
    z-index: 2;
    max-width: 300px;
    margin: 0 auto;
}

.window-frame {
    background: #E8E0D5;
    border-radius: 12px;
    padding: 12px;
    box-shadow: var(--shadow-lg);
}

.window-glass {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, #A8D8EA 0%, #C9E8F5 50%, #B8D8E8 100%);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.glass-reflection {
    position: absolute;
    top: 0;
    left: 0;
    width: 40%;
    height: 100%;
    background: linear-gradient(90deg, rgba(255,255,255,0.3) 0%, transparent 100%);
    transform: skewX(-10deg);
}

.quiet-text {
    font-size: 60px;
    color: rgba(255,255,255,0.8);
    z-index: 1;
    font-weight: 900;
    text-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.window-sill {
    height: 6px;
    background: #C8BDA5;
    border-radius: 0 0 8px 8px;
    margin-top: 4px;
}

.noise-outside, .quiet-inside {
    position: absolute;
    text-align: center;
    font-size: var(--font-size-xs);
}

.noise-outside {
    top: -36px;
    right: -20px;
    color: #E74C3C;
}

.quiet-inside {
    bottom: -36px;
    left: -20px;
    color: #27AE60;
}

.noise-wave, .quiet-icon { font-size: 20px; display: block; }

/* ==================== Pain Points ==================== */
.section-painpoints {
    background: var(--color-bg-gray);
}

.painpoints-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.painpoint-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    border-left: 4px solid var(--color-primary);
    transition: all 0.3s;
}

.painpoint-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.painpoint-icon {
    font-size: 32px;
    margin-bottom: 8px;
}

.painpoint-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 8px;
    color: var(--color-text);
}

.painpoint-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.painpoint-data {
    margin-top: 12px;
    padding: 8px 12px;
    background: var(--color-primary-bg);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-primary);
}

.painpoint-note {
    text-align: center;
    margin-top: 24px;
    padding: 12px 20px;
    background: #FFFBF0;
    border: 1px solid #F5D77B;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: #8B6914;
}

/* ==================== Solution ==================== */
.section-solution { background: var(--color-bg); }

.solution-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.solution-card {
    padding: 24px;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    position: relative;
    transition: all 0.3s;
}

.solution-card:hover { border-color: var(--color-primary-light); box-shadow: var(--shadow-sm); }

.solution-num {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 40px;
    font-weight: 900;
    color: var(--color-primary-bg);
}

.solution-card h3 {
    font-size: var(--font-size-md);
    margin-bottom: 6px;
    padding-right: 50px;
}

.solution-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.solution-cta {
    text-align: center;
    margin-top: 28px;
}

/* ==================== Products ==================== */
.section-products { background: var(--color-bg-gray); }

.products-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.product-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    border: 2px solid var(--color-border-light);
    text-align: center;
    position: relative;
    transition: all 0.3s;
}

.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.product-card.featured {
    border-color: var(--color-primary);
    box-shadow: 0 4px 20px rgba(201,22,35,0.15);
}

.product-tag {
    display: inline-block;
    padding: 2px 12px;
    border-radius: 12px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    margin-bottom: 12px;
    background: var(--color-bg-gray);
    color: var(--color-text-secondary);
}

.product-card.featured .product-tag {
    background: var(--color-primary);
    color: white;
}

.product-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: 12px;
}

.product-spec {
    margin-bottom: 16px;
}

.product-spec span {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

.product-spec strong {
    font-size: 32px;
    color: var(--color-primary);
    font-weight: 900;
}

.product-features {
    list-style: none;
    text-align: left;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.product-features li {
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: bold;
}

.btn-sm { padding: 8px 20px; font-size: var(--font-size-sm); }

/* ==================== Process Steps ==================== */
.section-process { background: var(--color-bg); }

.process-steps {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.process-step {
    text-align: center;
    padding: 20px;
    position: relative;
    max-width: 240px;
}

.step-number {
    width: 36px;
    height: 36px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: var(--font-size-sm);
    margin: 0 auto 8px;
}

.step-icon { font-size: 28px; margin-bottom: 8px; }

.process-step h4 {
    font-size: var(--font-size-md);
    margin-bottom: 4px;
}

.process-step p {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.process-arrow {
    font-size: 24px;
    color: var(--color-primary);
    transform: rotate(90deg);
}

/* ==================== FAQ ==================== */
.section-faq { background: var(--color-bg-gray); }

.faq-list {
    max-width: 750px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.faq-item {
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    cursor: pointer;
    font-weight: 600;
    font-size: var(--font-size-base);
    user-select: none;
}

.faq-arrow { transition: transform 0.3s; color: var(--color-text-light); }

.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-item.open .faq-question { color: var(--color-primary); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer { max-height: 500px; }

.faq-answer p {
    padding: 0 20px 16px;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ==================== Trust Bar ==================== */
.section-trust { padding: 24px 0; background: var(--color-bg); }

.trust-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    padding: 0;
}

.trust-bar .trust-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: var(--color-bg-gray);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.trust-icon { font-size: 18px; }

/* ==================== Final CTA ==================== */
.section-final-cta { padding: 32px 0 64px; }

.cta-urgency {
    margin-top: 12px;
    font-size: var(--font-size-xs);
    background: rgba(255,255,255,0.2);
    display: inline-block;
    padding: 4px 14px;
    border-radius: 12px;
}

/* Case Mini Metrics */
.case-mini-metrics {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
}

.mini-metric {
    font-size: var(--font-size-xs);
    background: var(--color-primary-bg);
    color: var(--color-primary);
    padding: 2px 8px;
    border-radius: 4px;
}

/* ==================== Responsive Additions ==================== */

/* Tablet */
@media (min-width: 768px) {
    .painpoints-grid { grid-template-columns: repeat(3, 1fr); }
    .solution-grid { grid-template-columns: repeat(2, 1fr); }
    .products-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { flex-direction: row; align-items: flex-start; gap: 0; }
    .process-arrow { transform: rotate(0deg); align-self: center; margin-top: 30px; }
    .hero-trust { justify-content: flex-start; }
    .hero-banner { text-align: left; }
}

/* Desktop */
@media (min-width: 1024px) {
    .hero-visual { display: block; }
    .hero-shape {
        width: 450px;
        height: 450px;
        background: radial-gradient(circle, var(--color-primary-bg) 0%, var(--color-bg-gray) 50%, transparent 70%);
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
}

/* ==============================================================
   2.0 JD-style 11-section Homepage
   ============================================================== */

/* Section Common */
.sec-headline { font-size: 21px; font-weight: 800; text-align: center; margin-bottom: 10px; line-height: 1.4; }
.sec-headline .hl { color: var(--color-primary); }
.sec-sub { text-align: center; font-size: 13px; color: var(--color-text-secondary); margin-bottom: 24px; }
.link-more { display: block; text-align: center; margin-top: 20px; font-size: 13px; color: var(--color-primary); font-weight: 600; }

/* ===== 1. Hero ===== */
.sec-hero {
    background: linear-gradient(175deg, #0d0505 0%, #1f0c0c 40%, #2a1010 100%);
    padding: 56px 0 40px; color: #fff; position: relative; overflow: hidden;
}
.sec-hero::before {
    content: ''; position: absolute; top: -80px; right: -60px;
    width: 280px; height: 280px;
    background: radial-gradient(circle, rgba(201,22,35,0.15) 0%, transparent 70%);
}
.hero-grid { display: flex; flex-direction: column; gap: 28px; position: relative; z-index: 1; }
.hero-text { text-align: center; }
.hero-eyebrow { display: inline-block; font-size: 11px; color: rgba(255,255,255,0.45); margin-bottom: 16px; letter-spacing: 2px; padding: 4px 14px; border: 1px solid rgba(255,255,255,0.12); border-radius: 20px; }
.hero-headline { font-size: 24px; font-weight: 900; line-height: 1.35; margin-bottom: 14px; letter-spacing: 1px; }
.hero-headline .hl { color: var(--color-primary-light); display: block; margin-top: 2px; }
.hero-sub { font-size: 13px; color: rgba(255,255,255,0.55); margin-bottom: 24px; line-height: 1.7; }
.hero-btns { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.btn-hero {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 14px 32px; background: var(--color-primary); color: #fff;
    border-radius: 28px; font-size: 15px; font-weight: 700;
    box-shadow: 0 4px 20px rgba(201,22,35,0.4); transition: all 0.2s;
}
.btn-hero:hover { transform: translateY(-2px); box-shadow: 0 6px 28px rgba(201,22,35,0.5); }
.hero-badge { font-size: 10px; color: rgba(255,255,255,0.35); }
.hero-visual { display: flex; justify-content: center; gap: 14px; align-items: center; margin: 8px 0; }
.hero-db-box {
    text-align: center; background: rgba(255,255,255,0.06);
    backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,0.1);
    border-radius: 20px; padding: 24px 28px;
}
.db-num { font-size: 60px; font-weight: 900; display: block; line-height: 1; color: #fff; }
.db-unit { font-size: 18px; font-weight: 600; color: rgba(255,255,255,0.6); }
.db-label { font-size: 11px; color: rgba(255,255,255,0.3); margin-top: 4px; }
.hero-stamp {
    background: var(--color-primary); color: #fff; width: 68px; height: 68px;
    border-radius: 50%; display: flex; flex-direction: column; align-items: center;
    justify-content: center; font-size: 9px; font-weight: 700; line-height: 1.3;
    text-align: center; flex-shrink: 0; box-shadow: 0 0 24px rgba(201,22,35,0.5);
}
.hero-trust-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin-top: 24px; font-size: 10px; color: rgba(255,255,255,0.3); position: relative; z-index: 1; letter-spacing: 0.5px; }

/* ===== 2. Pain Points ===== */
.sec-pain { padding: 56px 0; background: #fff; }
.pain-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.pain-card {
    background: #fafafa; padding: 20px 16px; border-radius: 14px;
    transition: all 0.2s; position: relative; overflow: hidden;
}
.pain-card::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--color-primary); border-radius: 0 2px 2px 0; }
.pain-card:hover { background: #fff5f5; transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.pain-icon { font-size: 28px; margin-bottom: 8px; display: block; }
.pain-card h4 { font-size: 14px; margin-bottom: 6px; color: #222; }
.pain-card p { font-size: 12px; color: #777; line-height: 1.6; }
.pain-footer { text-align: center; margin-top: 28px; font-size: 11px; color: #aaa; font-style: italic; line-height: 1.6; }

/* ===== 3. Effect ===== */
.sec-effect { padding: 56px 0; background: #fafafa; }
.effect-grid { display: flex; flex-direction: column; gap: 28px; align-items: center; }
.db-chart { width: 100%; max-width: 380px; padding: 0 8px; }
.db-bar-row { display: flex; align-items: flex-end; gap: 8px; height: 110px; }
.db-bar {
    flex: 1; border-radius: 6px 6px 0 0; display: flex; align-items: flex-start;
    justify-content: center; padding-top: 4px; font-size: 9px; color: #fff; font-weight: 700;
}
.db-bar.active { box-shadow: 0 0 20px rgba(39,174,96,0.4); position: relative; }
.db-bar.active::after { content: '逸静'; position: absolute; bottom: -20px; font-size: 9px; color: var(--color-primary); font-weight: 700; }
.db-labels { display: flex; gap: 8px; margin-top: 8px; font-size: 10px; color: #999; }
.db-labels span { flex: 1; text-align: center; }
.before-after { display: flex; gap: 16px; align-items: center; }
.ba-card { text-align: center; padding: 20px 18px; border-radius: 14px; min-width: 110px; }
.ba-card.before { background: #fff; border: 2px solid #ffccc7; }
.ba-card.after { background: #fff; border: 2px solid #87d068; }
.ba-label { font-size: 10px; color: #999; margin-bottom: 6px; text-transform: uppercase; letter-spacing: 1px; }
.ba-num { font-size: 36px; font-weight: 900; line-height: 1; }
.ba-num span { font-size: 14px; font-weight: 600; }
.ba-card.before .ba-num { color: #e74c3c; }
.ba-card.after .ba-num { color: #27ae60; }
.ba-desc { font-size: 10px; color: #999; margin-top: 4px; }
.ba-arrow { font-size: 22px; font-weight: 900; color: #ddd; }

/* ===== 4. Tech ===== */
.sec-tech { padding: 56px 0; background: #fff; }
.tech-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.tech-card {
    background: #fafafa; padding: 18px 14px; border-radius: 14px;
    position: relative; transition: all 0.2s;
}
.tech-card:hover { background: #fff5f5; box-shadow: 0 2px 12px rgba(0,0,0,0.05); }
.tech-num {
    display: inline-flex; align-items: center; justify-content: center;
    width: 24px; height: 24px; background: var(--color-primary);
    color: #fff; border-radius: 50%; font-size: 11px; font-weight: 800;
    margin-bottom: 10px;
}
.tech-card h4 { font-size: 13px; margin-bottom: 4px; }
.tech-card p { font-size: 11px; color: #777; line-height: 1.5; }

/* ===== 5. Scene ===== */
.sec-scene { padding: 56px 0; background: #fafafa; }
.scene-list { max-width: 520px; margin: 0 auto; }
.scene-row { display: flex; align-items: stretch; gap: 8px; margin-bottom: 12px; }
.scene-before, .scene-after {
    flex: 1; padding: 14px 12px; border-radius: 12px; font-size: 12px;
    display: flex; align-items: center; line-height: 1.5;
}
.scene-before { background: #fff5f5; border: 1px solid #ffa39e; color: #cf1322; }
.scene-after { background: #f6ffed; border: 1px solid #b7eb8f; color: #389e0d; }
.scene-arrow { display: flex; align-items: center; font-size: 18px; color: #ccc; font-weight: 700; }

/* ===== 6. Contract ===== */
.sec-contract {
    padding: 56px 0; color: #fff; position: relative; overflow: hidden;
    background: linear-gradient(150deg, #0d0505 0%, #1a0a0a 50%, #2d1111 100%);
}
.sec-contract::after { content: ''; position: absolute; bottom: -40px; left: -40px; width: 200px; height: 200px; background: radial-gradient(circle, rgba(201,22,35,0.1) 0%, transparent 70%); }
.contract-box { display: flex; flex-direction: column; gap: 28px; align-items: center; position: relative; z-index: 1; }
.contract-text h2 { font-size: 24px; margin-bottom: 12px; line-height: 1.3; }
.contract-text .hl { color: #ff7875; }
.contract-text p { font-size: 13px; opacity: 0.65; line-height: 1.8; }
.contract-paper {
    background: #fff; color: #222; padding: 28px 24px; border-radius: 12px;
    text-align: center; position: relative; box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.contract-stamp {
    position: absolute; top: 14px; right: 14px; border: 3px solid var(--color-primary);
    color: var(--color-primary); width: 48px; height: 48px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 9px; font-weight: 700; transform: rotate(-18deg); opacity: 0.7;
}
.contract-paper .contract-title { font-size: 14px; font-weight: 800; color: var(--color-primary); margin-bottom: 12px; letter-spacing: 2px; }
.contract-detail { font-size: 10px; color: #999; margin: 3px 0; }
.contract-flow { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin-top: 28px; font-size: 10px; position: relative; z-index: 1; }
.contract-flow span { padding: 5px 10px; border-radius: 14px; background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.5); }
.contract-flow span.active { background: var(--color-primary); color: #fff; font-weight: 600; }

/* ===== 7. Cases ===== */
.sec-cases { padding: 56px 0; background: #fff; }
.cases-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.case-card-2 {
    background: #fafafa; border-radius: 14px; overflow: hidden;
    transition: all 0.2s; display: flex; flex-direction: column;
}
.case-card-2:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,0,0,0.08); }
.case-card-img { height: 100px; background: #eee; display: flex; align-items: center; justify-content: center; }
.case-card-img img { width: 100%; height: 100%; object-fit: cover; }
.case-avatar { font-size: 36px; opacity: 0.5; }
.case-card-body { padding: 12px; }
.case-card-body h4 { font-size: 13px; margin-bottom: 4px; line-height: 1.3; }
.case-summary { font-size: 11px; color: #999; margin-bottom: 8px; }
.case-data { display: flex; flex-wrap: wrap; gap: 4px; }
.data-tag { padding: 3px 8px; background: var(--color-primary-bg); color: var(--color-primary); border-radius: 4px; font-size: 10px; font-weight: 700; }
.data-tag small { font-weight: 400; opacity: 0.7; }

/* ===== 8. Enterprise ===== */
.sec-enterprise { padding: 56px 0; background: #fafafa; }
.ent-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.ent-card {
    background: #fff; padding: 14px 12px; border-radius: 10px;
    border: 1px solid #f0f0f0; transition: all 0.2s;
}
.ent-card:hover { border-color: #ffa39e; }
.ent-card.highlight { border-color: var(--color-primary); background: #fff5f5; }
.ent-card strong { font-size: 12px; display: block; margin-bottom: 3px; }
.ent-card p { font-size: 10px; color: #999; }
.ent-footer { text-align: center; margin-top: 24px; font-size: 11px; color: #bbb; }

/* ===== 9. Brand ===== */
.sec-brand { padding: 56px 0; background: #fff; }
.brand-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.brand-card {
    background: #fafafa; padding: 22px 14px; border-radius: 14px;
    text-align: center; transition: all 0.2s;
}
.brand-card:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.brand-card.star { background: linear-gradient(135deg, #fff8e1, #fff3cd); }
.brand-icon { font-size: 32px; margin-bottom: 8px; display: block; }
.brand-card h4 { font-size: 13px; margin-bottom: 4px; }
.brand-card p { font-size: 10px; color: #999; line-height: 1.4; }

/* ===== 10. FAQ ===== */
.sec-faq { padding: 56px 0; background: #fafafa; }
.faq-list-2 { max-width: 640px; margin: 0 auto; }
.faq-item-2 { background: #fff; border-radius: 12px; margin-bottom: 8px; overflow: hidden; border: 1px solid #f0f0f0; }
.faq-q { padding: 14px 16px; font-size: 13px; font-weight: 600; cursor: pointer; display: flex; align-items: center; gap: 10px; user-select: none; }
.faq-q span { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; background: var(--color-primary); color: #fff; border-radius: 50%; font-size: 11px; font-weight: 700; flex-shrink: 0; }
.faq-a { max-height: 0; overflow: hidden; transition: all 0.3s ease; padding: 0 16px 0 50px; font-size: 12px; color: #777; line-height: 1.7; }
.faq-item-2.open .faq-a { max-height: 300px; padding-bottom: 14px; }
.faq-item-2.open { border-color: var(--color-primary-light); }

/* ===== Articles ===== */
.sec-articles { padding: 56px 0; background: #fff; }
.articles-grid-2 { display: flex; flex-direction: column; gap: 12px; }
.article-card-2 {
    display: flex; gap: 12px; background: #fafafa; border-radius: 14px;
    overflow: hidden; transition: all 0.2s;
}
.article-card-2:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,0.06); }
.card-img { width: 100px; height: 75px; background: #eee; flex-shrink: 0; display: flex; align-items: center; justify-content: center; border-radius: 14px 0 0 14px; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.card-img-placeholder { font-size: 28px; color: #ccc; }
.card-info { padding: 10px; flex: 1; min-width: 0; }
.card-info h4 { font-size: 13px; margin-bottom: 4px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-info p { font-size: 11px; color: #999; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 4px; }
.card-meta { font-size: 10px; color: #bbb; }

/* ===== 11. CTA ===== */
.sec-cta-final { padding: 56px 0 64px; background: #fafafa; }
.cta-steps { display: flex; gap: 0; margin-bottom: 32px; }
.cta-step { flex: 1; text-align: center; padding: 8px; }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 50%; background: var(--color-primary); color: #fff; font-size: 16px; font-weight: 800; margin-bottom: 8px; box-shadow: 0 2px 12px rgba(201,22,35,0.3); }
.cta-step strong { display: block; font-size: 12px; margin-bottom: 4px; }
.cta-step p { font-size: 10px; color: #bbb; }
.cta-bottom { text-align: center; background: linear-gradient(135deg, var(--color-primary), #8B0000); color: #fff; padding: 32px 24px; border-radius: 20px; box-shadow: 0 8px 32px rgba(201,22,35,0.25); }
.cta-bottom h3 { font-size: 18px; margin-bottom: 8px; }
.cta-bottom p { font-size: 11px; opacity: 0.7; margin-bottom: 20px; }
.btn-cta-main { display: inline-block; background: #fff; color: var(--color-primary); padding: 14px 40px; border-radius: 28px; font-size: 16px; font-weight: 800; box-shadow: 0 4px 16px rgba(0,0,0,0.15); transition: all 0.2s; }
.btn-cta-main:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(0,0,0,0.2); }

/* ===== Responsive ===== */
@media (min-width: 768px) {
    .sec-headline { font-size: 26px; }
    .hero-grid { flex-direction: row; align-items: center; }
    .hero-text { text-align: left; flex: 1; }
    .hero-headline { font-size: 30px; }
    .hero-btns { flex-direction: row; }
    .contract-box { flex-direction: row; justify-content: center; }
    .effect-grid { flex-direction: row; justify-content: center; gap: 40px; }
    .pain-grid { grid-template-columns: repeat(4, 1fr); }
    .tech-grid { grid-template-columns: repeat(3, 1fr); max-width: 700px; margin: 0 auto; }
    .cases-grid-2 { grid-template-columns: repeat(3, 1fr); }
    .ent-grid { grid-template-columns: repeat(4, 1fr); }
    .brand-grid { grid-template-columns: repeat(3, 1fr); }
    .articles-grid-2 { flex-direction: row; flex-wrap: wrap; }
    .article-card-2 { width: calc(50% - 6px); }
    .cta-bottom { padding: 40px 48px; }
    .cta-bottom h3 { font-size: 22px; }
}
@media (min-width: 1024px) {
    .hero-headline { font-size: 36px; }
    .sec-headline { font-size: 28px; }
    .tech-grid { grid-template-columns: repeat(5, 1fr); max-width: 900px; }
    .brand-grid { grid-template-columns: repeat(5, 1fr); }
    .article-card-2 { width: calc(33.33% - 8px); }
}