/* ===================== 全局重置与基础 ===================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #0d47a1;
    --primary-light: #1565c0;
    --primary-accent: #42a5f5;
    --bg-light: #f5f8fc;
    --bg-card: #ffffff;
    --text: #2c3e50;
    --text-light: #7f8c9b;
    --white: #ffffff;
    --dark-bg: #1b2a4a;
    --radius: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
    --shadow: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-hover: 0 8px 28px rgba(13,71,161,0.12);
    --transition: all 0.25s ease;
    --max-width: 1200px;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-weight: 400;
    color: var(--text);
    line-height: 1.7;
    background: var(--white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    line-height: 1.3;
    color: var(--primary);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 clamp(16px, 3vw, 24px);
}

.section { padding: clamp(60px, 8vw, 90px) 0; }

.section-title {
    text-align: center;
    font-size: clamp(24px, 4vw, 36px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 10px;
}

.section-subtitle {
    text-align: center;
    font-size: clamp(14px, 1.6vw, 16px);
    color: var(--text-light);
    margin-bottom: clamp(30px, 5vw, 50px);
}

/* ===================== 按钮样式 ===================== */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
    line-height: 1.5;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(13,71,161,0.25);
}

.btn-primary {
    background: var(--white);
    color: var(--primary);
    border-color: var(--white);
}
.btn-primary:hover { background: var(--bg-light); border-color: var(--bg-light); }

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
}
.btn-outline:hover { background: var(--white); color: var(--primary); }

.btn-blue {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}
.btn-blue:hover { background: var(--primary-light); border-color: var(--primary-light); }

.btn-blue-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}
.btn-blue-outline:hover { background: var(--primary); color: var(--white); }

/* ===================== 顶部导航栏 ===================== */
.header {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: box-shadow 0.3s ease;
}

.header.scrolled { box-shadow: 0 1px 12px rgba(0,0,0,0.06); }

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 90px;
}

.header-logo { flex-shrink: 0; }

.header-logo .logo-name {
    font-size: clamp(28px, 3.5vw, 38px);
    font-weight: 900;
    color: var(--primary);
    line-height: 1.2;
    display: block;
}

.header-logo .logo-info {
    font-size: clamp(12px, 1.4vw, 16px);
    color: var(--text-light);
    line-height: 1.3;
    display: block;
    margin-top: 2px;
}

.header-nav { display: flex; align-items: center; gap: clamp(16px, 2.5vw, 32px); }

.header-nav a {
    font-size: 15px;
    font-weight: 400;
    color: var(--text);
    position: relative;
    padding: 4px 0;
}

.header-nav a::after {
    content: '';
    position: absolute;
    bottom: 0; left: 50%;
    width: 0; height: 2px;
    background: var(--primary-accent);
    transition: all 0.3s ease;
    transform: translateX(-50%);
    border-radius: 2px;
}

.header-nav a:hover, .header-nav a.active { color: var(--primary); font-weight: 700; }
.header-nav a:hover::after, .header-nav a.active::after { width: 100%; }

.header-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 700;
    color: var(--primary);
    flex-shrink: 0;
}

.header-phone svg { width: 18px; height: 18px; }

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 4px;
}

.hamburger span {
    width: 22px; height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===================== 页面Banner（内页） ===================== */
.page-banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: clamp(120px, 14vw, 150px) 0 clamp(40px, 6vw, 65px);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.06) 0%, transparent 60%);
    pointer-events: none;
}

.page-banner h1 {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
}

.page-banner p {
    font-size: clamp(14px, 1.6vw, 16px);
    color: rgba(255,255,255,0.8);
    position: relative;
    z-index: 1;
}

/* ===================== 首页Banner ===================== */
.hero-banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--primary-accent) 100%);
    padding: clamp(120px, 16vw, 170px) 0 clamp(60px, 10vw, 110px);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 80%, rgba(255,255,255,0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255,255,255,0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content { position: relative; z-index: 1; }

.hero-tag {
    display: inline-block;
    border: 1px solid rgba(255,255,255,0.4);
    border-radius: 50px;
    padding: 6px 24px;
    font-size: clamp(12px, 1.4vw, 14px);
    color: rgba(255,255,255,0.9);
    margin-bottom: clamp(16px, 2.5vw, 28px);
    letter-spacing: 2px;
}

.hero-title {
    font-size: clamp(32px, 7vw, 64px);
    font-weight: 900;
    color: var(--white);
    letter-spacing: clamp(3px, 0.8vw, 8px);
    margin-bottom: 12px;
}

.hero-founder {
    font-size: clamp(18px, 3vw, 28px);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 10px;
}

.hero-phone {
    font-size: clamp(22px, 4vw, 38px);
    font-weight: 900;
    background: linear-gradient(90deg, #ffd700, #ffb300);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 14px;
}

.hero-desc {
    font-size: clamp(14px, 1.6vw, 16px);
    color: rgba(255,255,255,0.85);
    margin-bottom: clamp(24px, 4vw, 40px);
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ===================== 数据统计条 ===================== */
.stats-bar {
    margin-top: -36px;
    position: relative;
    z-index: 10;
    padding-bottom: clamp(40px, 6vw, 80px);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: clamp(12px, 2vw, 20px);
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: clamp(20px, 3vw, 36px) clamp(12px, 2vw, 20px);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.03);
}

.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }

.stat-number {
    font-size: clamp(28px, 3.5vw, 40px);
    font-weight: 900;
    color: var(--primary);
    line-height: 1.2;
}

.stat-label { font-size: 13px; color: var(--text-light); margin-top: 6px; }

/* ===================== 产品卡片 ===================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: clamp(16px, 2.5vw, 30px);
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.04);
    transition: var(--transition);
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: transparent;
}

.product-card .card-img { width: 100%; height: 220px; overflow: hidden; }

.product-card .card-img img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.product-card:hover .card-img img { transform: scale(1.06); }

.product-card .card-body { padding: clamp(16px, 2.5vw, 24px); }

.product-card .card-tag {
    display: inline-block;
    background: var(--bg-light);
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    margin-bottom: 8px;
}

.product-card .card-title {
    font-size: clamp(16px, 2vw, 20px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 6px;
}

.product-card .card-desc {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 14px;
    line-height: 1.6;
}

.product-card .card-price {
    font-size: clamp(18px, 2.2vw, 22px);
    font-weight: 900;
    color: var(--primary-accent);
}

.product-card .card-price small { font-size: 13px; font-weight: 400; color: var(--text-light); }

/* ===================== 关于我们概览 ===================== */
.about-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: clamp(30px, 5vw, 60px);
    align-items: center;
}

.about-text h3 { font-size: clamp(22px, 3vw, 28px); margin-bottom: 14px; }
.about-text p { margin-bottom: 20px; color: var(--text); }

.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-top: 20px;
}

.feature-card {
    background: var(--bg-light);
    padding: 18px 12px;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover { background: var(--white); box-shadow: var(--shadow); }
.feature-card .feature-icon { font-size: 26px; margin-bottom: 6px; }
.feature-card .feature-title { font-size: 13px; font-weight: 700; color: var(--primary); }

.about-brand-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-lg);
    padding: clamp(36px, 6vw, 60px) clamp(24px, 4vw, 40px);
    text-align: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.about-brand-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 70% 30%, rgba(255,255,255,0.08) 0%, transparent 60%);
    pointer-events: none;
}

.about-brand-card .brand-name {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 900;
    letter-spacing: 6px;
    position: relative; z-index: 1;
}

.about-brand-card .brand-founder {
    font-size: clamp(18px, 2.5vw, 22px);
    font-weight: 700;
    margin-top: 10px;
    position: relative; z-index: 1;
}

.about-brand-card .brand-phone {
    font-size: clamp(22px, 3vw, 30px);
    font-weight: 900;
    margin-top: 14px;
    background: linear-gradient(90deg, #ffd700, #ffb300);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative; z-index: 1;
}

/* ===================== 新闻卡片 ===================== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: clamp(16px, 2.5vw, 30px);
}

.news-card {
    display: flex;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0,0,0,0.04);
    transition: var(--transition);
    cursor: pointer;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: transparent;
}

.news-card .card-img {
    width: clamp(180px, 25vw, 240px);
    flex-shrink: 0;
    overflow: hidden;
}

.news-card .card-img img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.news-card .card-body {
    padding: clamp(16px, 2.5vw, 24px);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-card .card-date { font-size: 12px; color: var(--text-light); margin-bottom: 6px; }

.news-card .card-title {
    font-size: clamp(15px, 1.8vw, 18px);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.news-card .card-desc { font-size: 13px; color: var(--text-light); line-height: 1.6; }

/* ===================== CTA行动号召 ===================== */
.cta-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: clamp(50px, 8vw, 80px) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.04) 0%, transparent 70%);
    pointer-events: none;
}

.cta-title {
    font-size: clamp(22px, 3.5vw, 32px);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 14px;
    position: relative; z-index: 1;
}

.cta-phone {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 900;
    color: var(--white);
    margin-bottom: clamp(20px, 3vw, 30px);
    position: relative; z-index: 1;
}

.cta-section .btn { position: relative; z-index: 1; }

/* ===================== 页脚 ===================== */
.footer {
    background: var(--dark-bg);
    color: rgba(255,255,255,0.8);
    padding: clamp(40px, 6vw, 60px) 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: clamp(24px, 4vw, 40px);
    padding-bottom: clamp(28px, 4vw, 40px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .footer-logo {
    font-size: clamp(20px, 2.5vw, 26px);
    font-weight: 900;
    color: var(--white);
    letter-spacing: 3px;
    display: block;
    margin-bottom: 8px;
}

.footer-brand .footer-founder,
.footer-brand .footer-phone-text {
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 4px;
}

.footer-brand .footer-desc {
    font-size: 13px;
    line-height: 1.8;
    color: rgba(255,255,255,0.5);
    margin-top: 12px;
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-col ul li { margin-bottom: 8px; }

.footer-col ul li a {
    font-size: 13px;
    color: rgba(255,255,255,0.5);
}
.footer-col ul li a:hover { color: var(--white); }

.footer-copyright {
    text-align: center;
    padding: 18px 0;
    font-size: 12px;
    color: rgba(255,255,255,0.35);
}

/* ===================== 面包屑导航 ===================== */
.breadcrumb { padding: 18px 0; font-size: 13px; color: var(--text-light); }
.breadcrumb a { color: var(--primary); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 6px; }

/* ===================== 关于我们页面 ===================== */
.about-section { padding: clamp(40px, 6vw, 60px) 0; }

.about-section h2 {
    font-size: clamp(22px, 3vw, 28px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 18px;
}

.about-section p {
    font-size: clamp(14px, 1.5vw, 15px);
    line-height: 1.9;
    color: var(--text);
    margin-bottom: 14px;
}

.timeline { position: relative; padding: 36px 0; }

.timeline::before {
    content: '';
    position: absolute;
    left: 50%; top: 0; bottom: 0;
    width: 2px;
    background: var(--bg-light);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 36px;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
    padding-right: calc(50% + 28px);
    text-align: right;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
    padding-left: calc(50% + 28px);
}

.timeline-dot {
    position: absolute;
    left: 50%; transform: translateX(-50%);
    width: 14px; height: 14px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--white);
    box-shadow: 0 0 0 2px var(--primary-accent);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-light);
    padding: 16px 20px;
    border-radius: var(--radius);
}

.timeline-year {
    font-size: clamp(20px, 2.5vw, 24px);
    font-weight: 900;
    color: var(--primary);
    margin-bottom: 4px;
}

.timeline-text { font-size: 13px; color: var(--text); }

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: clamp(16px, 2.5vw, 30px);
    margin-top: 28px;
}

.value-card {
    background: var(--bg-light);
    padding: clamp(24px, 3.5vw, 36px) clamp(16px, 2.5vw, 24px);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.value-card:hover {
    background: var(--white);
    box-shadow: var(--shadow);
    transform: translateY(-3px);
}

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

.value-card h4 {
    font-size: clamp(16px, 2vw, 18px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 10px;
}

.value-card p { font-size: 13px; color: var(--text-light); }

.founder-card {
    display: flex;
    align-items: center;
    gap: clamp(24px, 4vw, 40px);
    background: var(--bg-light);
    padding: clamp(24px, 4vw, 40px);
    border-radius: var(--radius-lg);
    margin-top: 36px;
}

.founder-avatar {
    width: clamp(100px, 14vw, 160px);
    height: clamp(100px, 14vw, 160px);
    background: linear-gradient(135deg, var(--primary), var(--primary-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 900;
    flex-shrink: 0;
}

.founder-info h3 {
    font-size: clamp(20px, 2.5vw, 24px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 4px;
}

.founder-info .founder-title {
    font-size: 13px;
    color: var(--primary-accent);
    font-weight: 700;
    margin-bottom: 14px;
}

.founder-info p {
    font-size: 14px;
    color: var(--text);
    line-height: 1.8;
    margin-bottom: 10px;
}

.founder-info .founder-phone {
    font-size: clamp(18px, 2.2vw, 20px);
    font-weight: 900;
    color: var(--primary);
}

/* ===================== 产品中心 ===================== */
.filter-bar {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 24px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 700;
    border: 1.5px solid var(--bg-light);
    background: var(--white);
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
}

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

/* ===================== 产品详情 ===================== */
.product-detail-top {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: clamp(24px, 5vw, 50px);
    padding: 36px 0;
}

.product-detail-img { border-radius: var(--radius-lg); overflow: hidden; }

.product-detail-img img { width: 100%; height: auto; border-radius: var(--radius-lg); }

.product-detail-info h1 {
    font-size: clamp(24px, 3.5vw, 32px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 10px;
}

.product-detail-info .price {
    font-size: clamp(26px, 3vw, 32px);
    font-weight: 900;
    color: var(--primary-accent);
    margin-bottom: 18px;
}

.product-detail-info .desc {
    font-size: 14px;
    color: var(--text);
    line-height: 1.8;
    margin-bottom: 22px;
}

.spec-table { width: 100%; border-collapse: collapse; margin-bottom: 22px; }

.spec-table th, .spec-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--bg-light);
    font-size: 13px;
}

.spec-table th {
    font-weight: 700;
    color: var(--primary);
    width: 35%;
    background: var(--bg-light);
}

.spec-table td { color: var(--text); }

.product-detail-bottom { padding: 36px 0; }

.product-detail-bottom h2 {
    font-size: clamp(20px, 2.5vw, 24px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 18px;
}

.product-detail-bottom p {
    font-size: 14px;
    line-height: 1.9;
    color: var(--text);
    margin-bottom: 14px;
}

.related-products {
    padding: clamp(40px, 6vw, 60px) 0;
    background: var(--bg-light);
}

.related-products h2 {
    text-align: center;
    font-size: clamp(22px, 3vw, 28px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 36px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: clamp(16px, 2.5vw, 30px);
}

/* ===================== 新闻列表 ===================== */
.news-list { padding: clamp(40px, 6vw, 60px) 0; }
.news-list .news-card { margin-bottom: 20px; }
.news-list .news-card .card-img { width: clamp(200px, 25vw, 280px); }

.pagination { display: flex; justify-content: center; gap: 6px; margin-top: 36px; }

.pagination a, .pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px; height: 38px;
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 700;
    border: 1px solid var(--bg-light);
    color: var(--text);
    transition: var(--transition);
}

.pagination a:hover, .pagination span.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* ===================== 文章详情 ===================== */
.article-detail { padding: 36px 0 50px; }

.article-header { margin-bottom: 28px; }

.article-header h1 {
    font-size: clamp(24px, 3.5vw, 32px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 10px;
}

.article-meta { display: flex; gap: 18px; font-size: 13px; color: var(--text-light); flex-wrap: wrap; }

.article-body { font-size: 15px; line-height: 1.9; color: var(--text); }
.article-body p { margin-bottom: 18px; }

.article-body h2 {
    font-size: clamp(18px, 2.5vw, 22px);
    font-weight: 800;
    color: var(--primary);
    margin: 32px 0 14px;
}

.article-body h3 {
    font-size: clamp(16px, 2vw, 18px);
    font-weight: 700;
    color: var(--primary);
    margin: 22px 0 10px;
}

.article-body .article-img { margin: 24px 0; border-radius: var(--radius-lg); overflow: hidden; }
.article-body .article-img img { width: 100%; border-radius: var(--radius-lg); }

.article-nav {
    display: flex;
    justify-content: space-between;
    padding: 24px 0;
    border-top: 1px solid var(--bg-light);
    margin-top: 36px;
    gap: 12px;
}

.article-nav a { font-size: 13px; color: var(--primary); font-weight: 700; }
.article-nav a:hover { text-decoration: underline; }

/* ===================== 联系我们 ===================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: clamp(24px, 5vw, 50px);
    padding: clamp(40px, 6vw, 60px) 0;
}

.contact-info {
    background: var(--bg-light);
    padding: clamp(24px, 4vw, 40px);
    border-radius: var(--radius-lg);
}

.contact-info h2 {
    font-size: clamp(20px, 2.5vw, 24px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 24px;
}

.contact-item { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 20px; }

.contact-item .icon {
    width: 40px; height: 40px;
    background: var(--primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--white);
    font-size: 18px;
}

.contact-item .label { font-size: 12px; color: var(--text-light); margin-bottom: 2px; }
.contact-item .value { font-size: 15px; font-weight: 700; color: var(--text); }

.contact-item .value.phone-large {
    font-size: clamp(20px, 2.5vw, 24px);
    font-weight: 900;
    color: var(--primary);
}

.contact-form {
    background: var(--white);
    padding: clamp(24px, 4vw, 40px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.contact-form h2 {
    font-size: clamp(20px, 2.5vw, 24px);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 24px;
}

.form-group { margin-bottom: 18px; }

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid #e8edf3;
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-accent);
    box-shadow: 0 0 0 3px rgba(66,165,245,0.12);
}

.form-group textarea { height: 110px; resize: vertical; }

.form-submit {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.form-submit:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(13,71,161,0.25);
}

/* ===================== 响应式布局 ===================== */
@media (max-width: 992px) {
    .timeline::before { left: 18px; }

    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        flex-direction: row;
        padding-right: 0;
        padding-left: 46px;
        text-align: left;
    }

    .timeline-dot { left: 18px; }

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

@media (max-width: 768px) {
    .header-nav {
        display: none;
        position: absolute;
        top: 90px; left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 14px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    }

    .header-nav.open { display: flex; }
    .header-phone { display: none; }
    .hamburger { display: flex; }

    .news-card { flex-direction: column; }
    .news-card .card-img { width: 100%; height: 180px; }
    .news-list .news-card .card-img { width: 100%; }

    .founder-card { flex-direction: column; text-align: center; }

    .article-nav { flex-direction: column; }
}

@media (max-width: 480px) {
    .hero-banner { padding: 110px 0 60px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-card { padding: 16px 10px; }
    .stat-number { font-size: 24px; }

    .filter-btn { padding: 6px 16px; font-size: 12px; }
    .btn { padding: 10px 24px; font-size: 14px; }
}