/* ============================================
   博尔杰PTS V2 设计系统
   参照 brady.com.cn 风格
   ============================================ */

/* === 设计令牌 === */
:root {
    /* 颜色 */
    --primary: #0055a6;
    --primary-dark: #003d7a;
    --primary-light: #e8f0fa;
    --accent: #ed8936;
    --accent-dark: #dd7a2a;
    --text: #1a1a2e;
    --text-light: #555;
    --text-muted: #888;
    --bg: #fff;
    --bg-light: #f5f7fa;
    --bg-dark: #1a1a2e;
    --border: #e2e8f0;
    --success: #22c55e;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,.12);

    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 40px;
    --space-2xl: 64px;
    --space-3xl: 96px;

    /* 圆角 */
    --radius: 4px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* 字体 */
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

    /* 容器 */
    --container: 1200px;
}

/* === 基础重置 === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; transition: color .2s; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* === 容器 === */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* === 顶部通栏 === */
.top-bar {
    background: var(--bg-dark);
    color: rgba(255,255,255,.8);
    font-size: .8125rem;
    padding: 6px 0;
}
.top-bar-content {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}
.top-bar-content i { margin-right: 4px; font-size: .75rem; }
.top-bar-right { margin-left: auto; display: flex; gap: var(--space-md); }
.top-bar-right a { color: rgba(255,255,255,.7); }
.top-bar-right a:hover { color: #fff; }

/* === 主导航 === */
.main-header {
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow .3s;
}
.main-header.scrolled { box-shadow: var(--shadow-md); }
.header-content {
    display: flex;
    align-items: center;
    height: 64px;
}
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-right: var(--space-xl);
    flex-shrink: 0;
}
.logo-main {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -.02em;
}
.logo-sub {
    font-size: .75rem;
    color: var(--text-muted);
    display: block;
}
.desktop-nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex: 1;
}
.nav-link {
    font-size: .9375rem;
    font-weight: 500;
    color: var(--text);
    padding: 6px 0;
    position: relative;
    white-space: nowrap;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width .2s;
}
.nav-link:hover { color: var(--primary); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-link.active { color: var(--primary); font-weight: 600; }

.btn-contact {
    margin-left: auto;
    background: var(--accent);
    color: #fff;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-size: .875rem;
    font-weight: 500;
    white-space: nowrap;
    transition: background .2s;
}
.btn-contact:hover { background: var(--accent-dark); color: #fff; }
.btn-contact i { margin-right: 4px; }

/* 移动菜单按钮 */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 28px;
    height: 20px;
    position: relative;
    margin-left: auto;
}
.mobile-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text);
    position: absolute;
    left: 0;
    transition: .3s;
}
.mobile-toggle span:nth-child(1) { top: 0; }
.mobile-toggle span:nth-child(2) { top: 9px; }
.mobile-toggle span:nth-child(3) { top: 18px; }
.mobile-toggle.active span:nth-child(1) { top: 9px; transform: rotate(45deg); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { top: 9px; transform: rotate(-45deg); }

/* 移动导航 */
.mobile-nav {
    display: none;
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border);
    background: #fff;
}
.mobile-nav.open { display: block; }
.mobile-link {
    display: block;
    padding: 12px 0;
    font-size: .9375rem;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}
.mobile-link:last-child { border-bottom: none; }
.mobile-link.active { color: var(--primary); font-weight: 600; }
.mobile-contact {
    background: var(--accent);
    color: #fff !important;
    text-align: center;
    border-radius: var(--radius-sm);
    margin-top: var(--space-md);
    border-bottom: none;
}

/* === Hero === */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: #fff;
    overflow: hidden;
    padding: var(--space-3xl) 0;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 80% 20%, rgba(255,255,255,.05) 0%, transparent 50%),
        radial-gradient(circle at 20% 80%, rgba(237,137,54,.1) 0%, transparent 50%);
}
.hero-content { position: relative; max-width: 720px; }
.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,.15);
    backdrop-filter: blur(4px);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: .8125rem;
    font-weight: 500;
    margin-bottom: var(--space-lg);
    border: 1px solid rgba(255,255,255,.2);
}
.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    letter-spacing: -.02em;
}
.hero-desc {
    font-size: 1.125rem;
    color: rgba(255,255,255,.8);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
}
.hero-actions { display: flex; gap: var(--space-md); margin-bottom: var(--space-2xl); flex-wrap: wrap; }

/* Hero数据统计 */
.hero-stats {
    display: flex;
    gap: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255,255,255,.15);
}
.stat-item { text-align: center; }
.stat-num { font-size: 2rem; font-weight: 800; line-height: 1; }
.stat-label { font-size: .8125rem; color: rgba(255,255,255,.6); margin-top: 4px; }

/* === 按钮 === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: .9375rem;
    font-weight: 500;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all .2s;
    white-space: nowrap;
}
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn-outline-light { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.btn-outline-light:hover { background: #fff; color: var(--primary); border-color: #fff; }

/* === Section === */
.section { padding: var(--space-3xl) 0; }
.bg-light { background: var(--bg-light); }
.section-header { text-align: center; margin-bottom: var(--space-2xl); }
.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--space-sm);
}
.section-header p { color: var(--text-light); font-size: 1.0625rem; }

/* === Grid === */
.grid { display: grid; gap: var(--space-lg); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* === Card === */
.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all .3s;
}
.card-hover:hover {
    border-color: transparent;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--space-lg);
}
.card-icon.icon-green { background: #ecfdf5; color: #16a34a; }
.card-icon.icon-purple { background: #f3e8ff; color: #7c3aed; }
.card-icon.icon-red { background: #fef2f2; color: #dc2626; }
.card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--space-sm);
}
.card p { color: var(--text-light); font-size: .9375rem; margin-bottom: var(--space-md); }
.card-list {
    margin-bottom: var(--space-lg);
}
.card-list li {
    font-size: .8125rem;
    color: var(--text-muted);
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
}
.card-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 11px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--success);
}
.card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: .875rem;
    font-weight: 600;
    color: var(--accent);
    transition: gap .2s;
}
.card-link:hover { color: var(--accent-dark); gap: 10px; }

/* === Industry Card === */
.industry-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all .3s;
}
.industry-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.industry-visual {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    color: rgba(255,255,255,.9);
}
.industry-visual.blue { background: linear-gradient(135deg, #0055a6, #3b82f6); }
.industry-visual.green { background: linear-gradient(135deg, #16a34a, #4ade80); }
.industry-visual.purple { background: linear-gradient(135deg, #7c3aed, #a78bfa); }
.industry-visual.orange { background: linear-gradient(135deg, #ea580c, #f97316); }
.industry-visual.yellow { background: linear-gradient(135deg, #ca8a04, #facc15); }
.industry-visual.teal { background: linear-gradient(135deg, #0d9488, #2dd4bf); }
.industry-body { padding: var(--space-lg); }
.industry-body h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: var(--space-sm); }
.industry-body p { font-size: .875rem; color: var(--text-light); margin-bottom: var(--space-md); }

/* === Brand Grid === */
.brand-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}
.brand-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xl) var(--space-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all .2s;
}
.brand-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}
.brand-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: .05em;
}
.brand-item span { font-size: .8125rem; color: var(--text-muted); }

/* === CTA === */
.cta-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: #fff;
    text-align: center;
    padding: var(--space-3xl) 0;
}
.cta-section h2 { font-size: 2.25rem; font-weight: 700; margin-bottom: var(--space-md); }
.cta-section p { font-size: 1.0625rem; color: rgba(255,255,255,.8); margin-bottom: var(--space-xl); }
.cta-actions { display: flex; justify-content: center; gap: var(--space-md); flex-wrap: wrap; }

/* === Footer === */
.main-footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,.7);
    padding: var(--space-2xl) 0 var(--space-lg);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid rgba(255,255,255,.1);
    margin-bottom: var(--space-lg);
}
.footer-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--space-md);
}
.footer-about p { font-size: .875rem; line-height: 1.7; }
.footer-links h4, .footer-contact h4 {
    color: #fff;
    font-size: .9375rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}
.footer-links a {
    display: block;
    font-size: .875rem;
    padding: 4px 0;
    color: rgba(255,255,255,.6);
}
.footer-links a:hover { color: var(--accent); }
.footer-contact p {
    font-size: .875rem;
    padding: 4px 0;
}
.footer-contact i { margin-right: 6px; width: 16px; text-align: center; }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    font-size: .8125rem;
    color: rgba(255,255,255,.4);
}

/* === 页面横幅 === */
.page-banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: calc(var(--space-2xl) + 60px) 0 var(--space-2xl);
    text-align: center;
}
.page-banner h1 { font-size: 2.25rem; margin-bottom: var(--space-sm); }
.page-banner p { font-size: 1.1rem; opacity: 0.9; max-width: 600px; margin: 0 auto var(--space-md); }
.breadcrumb { font-size: 0.875rem; opacity: 0.7; }
.breadcrumb a { color: #fff; text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 6px; }

/* === 产品Tab导航 === */
.product-tabs {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    border-bottom: 2px solid var(--border);
    padding-bottom: 0;
    overflow-x: auto;
}
.tab-btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    background: none;
    font-size: 1rem;
    color: var(--text-light);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    white-space: nowrap;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 600;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* === 产品卡片 === */
.product-brand-section { margin-bottom: var(--space-2xl); }
.brand-header { margin-bottom: var(--space-xl); }
.brand-header h3 { font-size: 1.5rem; color: var(--text); margin-bottom: var(--space-xs); }
.brand-header p { color: var(--text-light); }
.brand-badge {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 2px 12px;
    border-radius: var(--radius);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.product-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all .3s;
}
.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.product-visual {
    background: var(--primary-light);
    padding: var(--space-xl);
    text-align: center;
    font-size: 3rem;
    color: var(--primary);
}
.product-visual.visual-green { background: #e6f9f0; color: #059669; }
.product-visual.visual-orange { background: #fff4e6; color: #d97706; }
.product-visual.visual-purple { background: #f0e6ff; color: #7c3aed; }
.product-info { padding: var(--space-lg); }
.product-info h4 { font-size: 1.125rem; margin-bottom: var(--space-sm); color: var(--text); }
.product-info p { font-size: 0.9rem; color: var(--text-light); margin-bottom: var(--space-md); line-height: 1.6; }
.product-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 2px 8px;
    border-radius: var(--radius);
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: var(--space-sm);
}
.product-tag.tag-self { background: #fff4e6; color: #d97706; }
.product-tag.tag-sm { font-size: 0.7rem; padding: 1px 6px; }
.product-specs {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-md);
}
.product-specs li {
    font-size: 0.85rem;
    color: var(--text-light);
    padding: 4px 0;
    border-bottom: 1px solid var(--bg-light);
}
.product-specs li:last-child { border-bottom: none; }
.product-specs li::before {
    content: '✓ ';
    color: var(--primary);
    font-weight: 600;
}

.product-card-featured {
    border-color: var(--primary);
    border-width: 2px;
}

.card-compact { padding: var(--space-md); text-align: center; }
.card-compact h4 { font-size: 1rem; margin-bottom: var(--space-xs); }
.card-compact p { font-size: 0.85rem; margin-bottom: var(--space-sm); }

.btn-sm {
    font-size: 0.85rem;
    padding: 6px 16px;
}
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}
.btn-primary.btn-sm {
    font-size: 0.85rem;
    padding: 6px 16px;
}

/* === 解决方案页面 === */
.solution-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all .3s;
}
.solution-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.solution-header {
    padding: var(--space-xl) var(--space-lg) var(--space-md);
}
.solution-header i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: var(--space-md);
    display: block;
}
.solution-header h3 { font-size: 1.25rem; margin-bottom: var(--space-sm); }
.solution-header p { color: var(--text-light); font-size: 0.9rem; line-height: 1.6; }
.solution-body {
    padding: 0 var(--space-lg) var(--space-lg);
    flex: 1;
}
.solution-body h4 {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}
.solution-list {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-md);
}
.solution-list li {
    font-size: 0.875rem;
    color: var(--text-light);
    padding: 4px 0;
}
.solution-list li::before {
    content: '• ';
    color: var(--primary);
    font-weight: bold;
}
.solution-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border);
    background: var(--bg-light);
}

/* === 新闻页面 === */
.news-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all .3s;
}
.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.news-thumb {
    height: 180px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary);
}
.news-thumb.thumb-green { background: #e6f9f0; color: #059669; }
.news-thumb.thumb-orange { background: #fff4e6; color: #d97706; }
.news-thumb.thumb-purple { background: #f0e6ff; color: #7c3aed; }
.news-body { padding: var(--space-lg); }
.news-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
}
.news-tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 1px 8px;
    border-radius: var(--radius);
    font-size: 0.75rem;
}
.news-body h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
    line-height: 1.4;
}
.news-body h3 a {
    color: var(--text);
    text-decoration: none;
}
.news-body h3 a:hover { color: var(--primary); }
.news-body p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; }

/* === 技术支持页面 === */
.support-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: all .3s;
}
.support-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.support-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: var(--space-md);
}
.support-card h3 { margin-bottom: var(--space-sm); }
.support-card p { font-size: 0.9rem; color: var(--text-light); margin-bottom: var(--space-md); }

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-sm);
    overflow: hidden;
}
.faq-question {
    padding: var(--space-md) var(--space-lg);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    background: #fff;
    border: none;
    width: 100%;
    text-align: left;
    font-size: 0.95rem;
    color: var(--text);
    transition: background 0.2s;
}
.faq-question:hover { background: var(--bg-light); }
.faq-question i { color: var(--text-muted); transition: transform 0.2s; }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}
.faq-answer-inner {
    padding: 0 var(--space-lg) var(--space-lg);
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}
.faq-item.active .faq-answer { max-height: 300px; }

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}
.contact-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: all .3s;
}
.contact-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.contact-card i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: var(--space-md);
    display: block;
}
.contact-card h4 { margin-bottom: var(--space-xs); }
.contact-card p { color: var(--text-light); font-size: 0.9rem; }
.contact-card a { color: var(--primary); text-decoration: none; font-weight: 500; }
.contact-card a:hover { text-decoration: underline; }

/* === 关于我们页面 === */
.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}
.about-text h2 { margin-bottom: var(--space-md); }
.about-text p { color: var(--text-light); line-height: 1.8; margin-bottom: var(--space-md); }
.about-visual {
    background: var(--primary-light);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
}
.about-visual i { font-size: 5rem; color: var(--primary); }

.timeline {
    position: relative;
    padding-left: 40px;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}
.timeline-item {
    position: relative;
    margin-bottom: var(--space-xl);
}
.timeline-dot {
    position: absolute;
    left: -33px;
    top: 4px;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 0 0 2px var(--primary);
}
.timeline-year {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 4px;
}
.timeline-content h4 { font-size: 1rem; margin-bottom: 4px; }
.timeline-content p { font-size: 0.875rem; color: var(--text-light); }

.value-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
}
.value-card i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: var(--space-md);
}
.value-card h4 { margin-bottom: var(--space-sm); }
.value-card p { font-size: 0.875rem; color: var(--text-light); }
.value-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    transition: all .3s;
}

/* === 滚动动画 === */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .6s ease, transform .6s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* === 响应式 === */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .desktop-nav, .btn-contact { display: none; }
    .mobile-toggle { display: block; }
    .top-bar-right { display: none; }

    .hero { padding: var(--space-2xl) 0; }
    .hero h1 { font-size: 2rem; }
    .hero-desc { font-size: 1rem; }
    .hero-desc br { display: none; }
    .hero-stats { gap: var(--space-lg); flex-wrap: wrap; }
    .stat-num { font-size: 1.5rem; }

    .section { padding: var(--space-2xl) 0; }
    .section-header h2 { font-size: 1.5rem; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .brand-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; gap: 4px; }
    .cta-section h2 { font-size: 1.5rem; }

    .page-banner { padding: calc(var(--space-xl) + 60px) 0 var(--space-xl); }
    .page-banner h1 { font-size: 1.75rem; }
    .product-tabs { gap: 4px; }
    .tab-btn { padding: var(--space-xs) var(--space-md); font-size: 0.9rem; }
    .about-intro { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .timeline { padding-left: 30px; }
}