/* ============================================
   KVB外汇平台 - 前台样式表（宽版·大气·响应式）
   ============================================ */
:root {
    --primary: #1a56db;
    --primary-light: #e8eefb;
    --primary-dark: #1340a8;
    --accent: #0ea5e9;
    --text: #1e293b;
    --text-light: #64748b;
    --bg: #f8fafc;
    --bg-soft: #eef4ff;
    --white: #ffffff;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 32px rgba(26,86,219,0.10);
    --radius: 10px;
    --radius-lg: 16px;
    --max-width: 1400px;   /* 原来 1200 → 加宽 */
    --pad-x: 32px;         /* 左右内边距更大 */
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.75;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: all .2s; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* 更宽的容器 */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--pad-x);
    width: 100%;
}

/* ===== 头部 ===== */
.site-header {
    background: var(--white);
    box-shadow: 0 1px 0 var(--border), 0 2px 8px rgba(0,0,0,0.03);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 16px;
}
.logo { display: flex; align-items: center; gap: 8px; }
.logo-text {
    font-size: 22px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
    letter-spacing: -0.5px;
}
.logo img { height: 42px; width: auto; }
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav > a, .dropdown-toggle {
    padding: 9px 18px;
    border-radius: 8px;
    font-size: 15px;
    color: var(--text);
    font-weight: 500;
    white-space: nowrap;
}
.main-nav > a:hover, .dropdown-toggle:hover { background: var(--primary-light); color: var(--primary); }
.nav-dropdown { position: relative; }
.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%; left: 0;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
    min-width: 180px;
    padding: 10px;
    z-index: 1001;
    border: 1px solid var(--border);
}
.nav-dropdown:hover .dropdown-menu { display: block; }
.dropdown-menu a { display: block; padding: 10px 16px; border-radius: 6px; font-size: 14px; }
.dropdown-menu a:hover { background: var(--primary-light); color: var(--primary); }
.header-actions { display: flex; gap: 10px; }
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid transparent;
    transition: all .2s;
    white-space: nowrap;
    text-align: center;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), #2563eb);
    color: #fff; border-color: transparent;
    box-shadow: 0 4px 12px rgba(26,86,219,0.25);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(26,86,219,0.35); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-lg { padding: 14px 40px; font-size: 15px; border-radius: 10px; }
.header-qq {
    text-align: center;
    font-size: 13px;
    color: var(--text-light);
    padding: 5px 0 8px;
    border-top: 1px solid var(--border);
    background: #fcfdff;
}
.header-qq strong { color: var(--primary); font-weight: 600; }
.mobile-toggle {
    display: none;
    background: none; border: none;
    font-size: 26px; cursor: pointer;
    color: var(--text); padding: 4px 8px;
}

/* ===== Hero：左右分栏 ===== */
.hero {
    background: linear-gradient(135deg, #eef4ff 0%, #f0f9ff 50%, #f5f3ff 100%);
    padding: 80px 0 70px;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -40%; right: -10%;
    width: 700px; height: 700px;
    background: radial-gradient(circle, rgba(26,86,219,0.08), transparent 70%);
    border-radius: 50%;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}
.hero-left { text-align: left; }
.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 22px;
    box-shadow: var(--shadow);
}
.hero h1 {
    font-size: 46px;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--text);
    line-height: 1.2;
    letter-spacing: -1px;
}
.hero h1 .highlight {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 17px;
    color: var(--text-light);
    margin-bottom: 36px;
    line-height: 1.75;
    max-width: 560px;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }

/* 右侧数据卡（两列） */
.hero-right {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.hero-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 28px 22px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    transition: all .3s;
}
.hero-card:hover { transform: translateY(-4px); box-shadow: 0 20px 40px rgba(26,86,219,0.15); }
.hero-card .icon {
    width: 48px; height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-light), #dbeafe);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px;
    margin-bottom: 14px;
}
.hero-card .num {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    letter-spacing: -1px;
}
.hero-card .num small { font-size: 16px; font-weight: 600; }
.hero-card .label { font-size: 13px; color: var(--text-light); margin-top: 4px; }

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-sm { padding: 60px 0; }

/* 标题默认居左（更宽视野） */
.section-header { margin-bottom: 50px; }
.section-header.center { text-align: center; }
.section-header.center .section-subtitle { margin: 0 auto; }
.section-label {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.section-title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.5px;
    line-height: 1.3;
}
.section-subtitle {
    color: var(--text-light);
    font-size: 16px;
    max-width: 680px;
}
.bg-white { background: var(--white); }
.bg-soft { background: var(--bg-soft); }

/* ===== 产品卡片 ===== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}
.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 26px;
    text-align: left;            /* 内容左对齐，更像专业站 */
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all .3s;
    display: block;
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}
.product-icon {
    width: 60px; height: 60px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary-light), #dbeafe);
    display: flex; align-items: center; justify-content: center;
    margin: 0 0 20px;
    font-size: 28px;
    transition: transform .3s;
}
.product-card:hover .product-icon { transform: scale(1.08) rotate(-3deg); }
.product-card h3 { font-size: 17px; margin-bottom: 10px; font-weight: 700; }
.product-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ===== 优势卡片 ===== */
.adv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.adv-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 30px 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all .3s;
    display: flex; gap: 18px;
}
.adv-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.adv-icon {
    flex-shrink: 0;
    width: 52px; height: 52px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px;
}
.adv-body h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.adv-body p { font-size: 13.5px; color: var(--text-light); line-height: 1.7; }

/* ===== 数据条 ===== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    background: linear-gradient(135deg, #1a56db 0%, #2563eb 100%);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    color: #fff;
    text-align: center;
    box-shadow: var(--shadow-lg);
}
.stats-bar .stat .num { font-size: 38px; font-weight: 800; line-height: 1.2; }
.stats-bar .stat .num small { font-size: 20px; }
.stats-bar .stat .label { font-size: 13px; opacity: .85; margin-top: 6px; }

/* ===== 交易步骤 ===== */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}
.step-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 26px 34px;
    text-align: left;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    position: relative;
    transition: all .3s;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-num {
    position: absolute;
    top: -18px; left: 26px;
    width: 44px; height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 17px;
    box-shadow: 0 6px 16px rgba(26,86,219,0.35);
}
.step-card h3 { font-size: 16px; margin: 8px 0 10px; font-weight: 700; }
.step-card p { font-size: 13.5px; color: var(--text-light); line-height: 1.7; }

/* ===== 交易平台 ===== */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.platform-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all .3s;
}
.platform-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.platform-badge {
    display: inline-block;
    padding: 3px 12px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    border-radius: 50px;
    margin-bottom: 14px;
}
.platform-card h3 { font-size: 18px; margin-bottom: 12px; font-weight: 700; }
.platform-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; margin-bottom: 18px; }
.platform-card ul { font-size: 13.5px; color: var(--text-light); line-height: 2; }
.platform-card ul li::before { content: '✓ '; color: var(--primary); font-weight: 700; }

/* ===== 新闻列表 ===== */
.news-list { display: flex; flex-direction: column; gap: 14px; }
.news-item {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
    transition: all .25s;
}
.news-item:hover { border-color: var(--primary); transform: translateX(4px); box-shadow: var(--shadow-lg); }
.news-item h3 { font-size: 16.5px; margin-bottom: 8px; font-weight: 600; line-height: 1.5; }
.news-item h3 a:hover { color: var(--primary); }
.news-item .summary { font-size: 14px; color: var(--text-light); line-height: 1.7; }
.news-item .date {
    font-size: 13px;
    color: var(--text-light);
    white-space: nowrap;
    background: var(--bg-soft);
    padding: 5px 14px;
    border-radius: 50px;
    flex-shrink: 0;
}

/* ===== FAQ ===== */
.faq-list { }
.faq-item {
    background: var(--white);
    border-radius: var(--radius);
    margin-bottom: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all .2s;
}
.faq-item:hover { border-color: var(--primary-light); }
.faq-q {
    padding: 20px 28px;
    font-size: 15.5px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}
.faq-q::after {
    content: '+';
    font-size: 22px;
    color: var(--primary);
    font-weight: 300;
    flex-shrink: 0;
    transition: transform .3s;
}
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a {
    max-height: 0; overflow: hidden;
    transition: max-height .35s ease, padding .35s ease;
    padding: 0 28px;
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.85;
}
.faq-item.open .faq-a { max-height: 400px; padding: 0 28px 24px; }

/* ===== 文章详情 ===== */
.article-detail {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.article-detail h1 { font-size: 28px; margin-bottom: 16px; line-height: 1.4; font-weight: 800; }
.article-meta { font-size: 14px; color: var(--text-light); margin-bottom: 32px; padding-bottom: 22px; border-bottom: 1px solid var(--border); }
.article-content { font-size: 15.5px; line-height: 1.9; word-break: break-word; }
.article-content p { margin-bottom: 18px; }
.article-content img { border-radius: 8px; margin: 16px 0; max-width: 100%; height: auto; }
.article-content h2 { font-size: 21px; margin: 32px 0 14px; font-weight: 700; }
.article-content h3 { font-size: 18px; margin: 24px 0 12px; font-weight: 700; }

/* ===== 分页 ===== */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 40px; flex-wrap: wrap; }
.pagination a {
    padding: 9px 16px;
    border-radius: 8px;
    background: var(--white);
    border: 1px solid var(--border);
    font-size: 14px;
    font-weight: 500;
}
.pagination a:hover, .pagination a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 页脚 ===== */
.site-footer { background: var(--white); border-top: 1px solid var(--border); }
.footer-grid {
    display: grid;
    grid-template-columns: 2.2fr 1fr 1fr;
    gap: 60px;
    padding: 64px 0 48px;
}
.footer-col h3 { font-size: 16px; margin-bottom: 20px; font-weight: 700; color: var(--text); }
.footer-desc { font-size: 14px; color: var(--text-light); line-height: 1.9; max-width: 460px; }
.footer-links li, .footer-contact li { margin-bottom: 12px; font-size: 14px; }
.footer-links a { color: var(--text-light); }
.footer-links a:hover { color: var(--primary); padding-left: 4px; }
.footer-contact li { color: var(--text-light); }
.footer-bottom {
    border-top: 1px solid var(--border);
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: var(--text-light);
}
.footer-bottom a { color: var(--text-light); }
.footer-bottom a:hover { color: var(--primary); }
.footer-sep { margin: 0 10px; color: var(--border); }

/* ===== 手机端固定底栏 ===== */
.mobile-bottom-bar {
    display: none;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    background: var(--white);
    border-top: 1px solid var(--border);
    padding: 8px 12px;
    gap: 10px;
    z-index: 2000;
    box-shadow: 0 -2px 16px rgba(0,0,0,0.08);
}
.mobile-btn {
    flex: 1; text-align: center;
    padding: 13px 0;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
}
.mobile-btn-primary { background: linear-gradient(135deg, var(--primary), #2563eb); color: #fff; }
.mobile-btn-outline { background: var(--primary-light); color: var(--primary); }

/* ===== 联系卡片 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}
.contact-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 26px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all .3s;
}
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.contact-card .icon {
    width: 60px; height: 60px;
    margin: 0 auto 18px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary-light), #dbeafe);
    display: flex; align-items: center; justify-content: center;
    font-size: 28px;
}
.contact-card h3 { font-size: 16px; margin-bottom: 10px; font-weight: 700; }
.contact-card p { color: var(--text-light); font-size: 14px; line-height: 1.7; }

/* ===== 关于页面 ===== */
.about-content { max-width: none; }
.about-content h2 {
    font-size: 22px;
    margin: 40px 0 16px;
    font-weight: 700;
    padding-left: 16px;
    border-left: 4px solid var(--primary);
    line-height: 1.4;
}
.about-content h2:first-child { margin-top: 0; }
.about-content p { margin-bottom: 16px; color: var(--text-light); line-height: 1.95; font-size: 15px; }
.about-content ul { margin: 14px 0 20px 8px; }
.about-content ul li { color: var(--text-light); line-height: 2; font-size: 14.5px; padding-left: 22px; position: relative; }
.about-content ul li::before { content: '◆'; color: var(--primary); position: absolute; left: 0; font-size: 10px; top: 8px; }

/* 关于页：左文右图，两栏 */
.about-split {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 50px;
    align-items: start;
}

/* 指标卡 */
.about-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 40px 0;
    padding: 36px 28px;
    background: var(--bg-soft);
    border-radius: var(--radius-lg);
}
.about-metric { text-align: center; }
.about-metric .num { font-size: 32px; font-weight: 800; color: var(--primary); line-height: 1.2; }
.about-metric .num small { font-size: 16px; }
.about-metric .label { font-size: 13px; color: var(--text-light); margin-top: 6px; }

/* 时间轴 */
.timeline { position: relative; padding-left: 40px; margin: 30px 0; }
.timeline::before {
    content: '';
    position: absolute;
    left: 12px; top: 8px; bottom: 8px;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-light), var(--primary), var(--primary-light));
}
.timeline-item { position: relative; padding-bottom: 30px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
    content: '';
    position: absolute;
    left: -34px; top: 4px;
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--white);
    box-shadow: 0 0 0 2px var(--primary-light);
}
.timeline-year { font-size: 15px; font-weight: 800; color: var(--primary); margin-bottom: 6px; }
.timeline-text { font-size: 14px; color: var(--text-light); line-height: 1.75; }

/* ===== 产品详情 ===== */
.product-detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.product-detail-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.product-detail-card h3 {
    font-size: 17px;
    margin-bottom: 18px;
    color: var(--primary);
    font-weight: 700;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-light);
}
.product-detail-card ul li {
    font-size: 14px;
    color: var(--text-light);
    padding: 10px 0;
    border-bottom: 1px dashed var(--border);
    display: flex;
    justify-content: space-between;
}
.product-detail-card ul li:last-child { border-bottom: none; }
.product-detail-card ul li strong { color: var(--text); font-weight: 600; }

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

/* ===== 404 ===== */
.error-page { text-align: center; padding: 130px 20px; }
.error-page .code {
    font-size: 120px; font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1; letter-spacing: -4px;
}
.error-page h1 { font-size: 26px; margin: 20px 0 12px; }
.error-page p { color: var(--text-light); margin-bottom: 32px; }

/* ===== CTA ===== */
.cta-box {
    background: linear-gradient(135deg, #1a56db 0%, #2563eb 100%);
    border-radius: var(--radius-lg);
    padding: 60px 50px;
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    align-items: center;
    gap: 40px;
    color: #fff;
    box-shadow: var(--shadow-lg);
}
.cta-box h2 { font-size: 30px; font-weight: 800; margin-bottom: 14px; line-height: 1.3; }
.cta-box p { font-size: 16px; opacity: .92; }
.cta-box .cta-btn-wrap { text-align: right; }
.cta-box .btn-white {
    background: #fff;
    color: var(--primary);
    border-color: #fff;
    padding: 16px 44px;
    font-size: 16px;
    font-weight: 700;
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    display: inline-block;
}
.cta-box .btn-white:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(0,0,0,0.22); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .hero-left { text-align: center; }
    .hero p { margin-left: auto; margin-right: auto; }
    .hero-btns { justify-content: center; }
    .about-split { grid-template-columns: 1fr; }
    .cta-box { grid-template-columns: 1fr; text-align: center; }
    .cta-box .cta-btn-wrap { text-align: center; }
}
@media (max-width: 900px) {
    :root { --pad-x: 20px; }
    .header-inner { height: 62px; }
    .main-nav {
        display: none;
        position: absolute;
        top: 62px; left: 0; right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 12px 20px 20px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.1);
        gap: 2px;
        border-top: 1px solid var(--border);
    }
    .main-nav.open { display: flex; }
    .main-nav > a, .dropdown-toggle { width: 100%; padding: 13px 10px; }
    .dropdown-menu { position: static; box-shadow: none; padding-left: 16px; display: block; border: none; }
    .dropdown-menu a { padding: 9px 10px; }
    .header-actions { display: none; }
    .mobile-toggle { display: block; }
    .header-qq { font-size: 12px; }
    .mobile-bottom-bar { display: flex; }
    body { padding-bottom: 76px; }

    .hero { padding: 50px 0 46px; }
    .hero h1 { font-size: 30px; letter-spacing: -0.5px; }
    .hero p { font-size: 15.5px; }
    .hero-right { grid-template-columns: 1fr 1fr; }

    .section { padding: 52px 0; }
    .section-title { font-size: 24px; }
    .section-subtitle { font-size: 14.5px; }
    .section-header { margin-bottom: 34px; }

    .stats-bar { grid-template-columns: repeat(2, 1fr); gap: 24px 16px; padding: 34px 20px; }
    .stats-bar .stat .num { font-size: 28px; }

    .about-metrics { grid-template-columns: repeat(2, 1fr); gap: 16px 12px; padding: 26px 18px; }
    .about-metric .num { font-size: 24px; }

    .footer-grid { grid-template-columns: 1fr; gap: 32px; padding: 44px 0 32px; }
    .article-detail { padding: 26px 20px; }
    .article-detail h1 { font-size: 21px; }
    .news-item { flex-direction: column; gap: 12px; padding: 20px; }
    .product-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .product-card { padding: 24px 18px; }
    .product-icon { width: 50px; height: 50px; font-size: 22px; margin-bottom: 14px; }
    .adv-card { padding: 22px 18px; }
    .cta-box { padding: 40px 24px; }
    .cta-box h2 { font-size: 22px; }
    .cta-box p { font-size: 14.5px; }
    .timeline { padding-left: 32px; }
}
@media (max-width: 480px) {
    .product-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 24px; }
    .hero-right { grid-template-columns: 1fr; }
    .stats-bar { grid-template-columns: 1fr 1fr; }
}