/* =========================================================
   山东恒昇环保科技股份有限公司 - 全站样式
   文件：css/style.css
   更新：2024-10-30
   ========================================================= */

/* ========== CSS Reset & Variables ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary: #51d406;
    --primary-dark: #134778;
    --primary-light: #2a7dc8;
    --accent: #25b087; 
    --text-dark: #000;
    --text-light: #f5f7fa;
    --text-muted: #888;
    --bg-white: #ffffff;
    --bg-light: #f7f9fc;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --transition: 0.3s ease;
    --container: 1200px;
    --nav-h: 72px;
}
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ========== 顶部悬浮导航 ========== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    height: var(--nav-h);
    display: flex; align-items: center; justify-content: center;
    padding: 0 40px;
    transition: background var(--transition), box-shadow var(--transition), height var(--transition);
    background: transparent;
}
.navbar.scrolled {
    background: rgba(255,255,255,0.98);
    box-shadow: var(--shadow-sm);
    height: 64px;
}
.navbar.scrolled .nav-link { color: var(--text-dark); }
.navbar.scrolled .nav-link:hover { color: var(--primary); }
.navbar.scrolled .logo-text { color: var(--primary); }
.navbar.scrolled .search-btn { color: var(--text-dark); }

.nav-inner {
    width: 100%; max-width: var(--container);
    display: flex; align-items: center; justify-content: space-between;
}

/* Logo */
.logo {
    display: flex; align-items: center; gap: 10px;
    flex-shrink: 0;
}
.logo img { height: 44px; width: auto; }
.logo-text {
    font-size: 18px; font-weight: 700;
    color: #fff; letter-spacing: 1px;
    white-space: nowrap; transition: color var(--transition);
}

/* 一级导航 */
.nav-menu {
    display: flex; align-items: center; gap: 6px;
}
.nav-menu > ul { display: flex; gap: 6px; }
.nav-item { position: relative; }
.nav-link {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 10px 18px;
    color: #fff; font-size: 15px; font-weight: 500;
    border-radius: 4px; position: relative;
    transition: color var(--transition), background var(--transition);
}
.nav-link::after {
    content: ''; position: absolute; bottom: 4px; left: 50%; transform: translateX(-50%);
    width: 0; height: 2px; background: #70b52c;
    transition: width var(--transition);
}
.nav-item:hover > .nav-link::after { width: 60%; }
.nav-item:hover > .nav-link { color: #70b52c; }

/* 当前栏目高亮由 aboutus.css 统一管理（is-current / home-active）*/

.nav-item .fa-chevron-down {
    font-size: 10px; transition: transform var(--transition);
}
.nav-item:hover > .nav-link .fa-chevron-down { transform: rotate(180deg); }

/* 二级下拉 */
.dropdown {
    position: absolute; top: 100%; left: 0;
    min-width: 200px; background: #fff;
    border-radius: 8px; box-shadow: var(--shadow-lg);
    padding: 8px 0;
    opacity: 0; visibility: hidden;
    transform: translateY(10px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    border-top: 3px solid var(--primary);
    z-index: 1100;
    backface-visibility: hidden;
}
.nav-item:hover > .dropdown {
    opacity: 1; visibility: visible; transform: translateY(0);
}
.dropdown-item {
    position: relative;
}
.dropdown-link {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 18px; color: var(--text-dark); font-size: 14px;
    transition: all var(--transition);
}
.dropdown-link:hover {
    background: var(--bg-light); color: var(--primary); padding-left: 24px;
}
.dropdown-link .fa-chevron-right {
    font-size: 10px; color: var(--text-muted);
}

/* 三级下拉 */
.dropdown.level-2 {
    top: 0; left: 100%;
    margin-left: 4px;
}
.dropdown-item:hover > .dropdown.level-2 {
    opacity: 1; visibility: visible; transform: translateX(0);
}
.dropdown.level-2 {
    opacity: 0; visibility: hidden; transform: translateX(-10px);
}

/* 搜索按钮 */
.nav-actions { display: flex; align-items: center; gap: 12px; }
.search-btn {
    width: 40px; height: 40px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: #fff; background: rgba(255,255,255,0.2);
    cursor: pointer; border: 1px solid rgba(255,255,255,0.35);
    transition: background var(--transition), border-color var(--transition), transform var(--transition);
    font-size: 16px;
}
.navbar.scrolled .search-btn {
    background: var(--bg-light); border-color: #e5e8ee;
}
.search-btn:hover {
    background: #70b52c; border-color: #70b52c;
    color: #fff; transform: scale(1.05);
}

/* ========== 语言切换下拉 ========== */
.lang-switch {
    position: relative;
}
.lang-btn {
    height: 40px; padding: 0 14px 0 12px;
    border-radius: 20px;
    display: inline-flex; align-items: center; gap: 6px;
    color: #fff; background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.35);
    cursor: pointer; font-size: 13px; font-weight: 600;
    transition: background var(--transition), border-color var(--transition), transform var(--transition);
    font-family: inherit;
}
.lang-btn .fa-globe { font-size: 14px; }
.lang-btn .fa-chevron-down { font-size: 9px; transition: transform 0.25s ease; }
.lang-btn:hover,
.lang-switch.open .lang-btn {
    background: #70b52c; border-color: #70b52c;
    color: #fff;
}
.lang-switch.open .lang-btn .fa-chevron-down { transform: rotate(180deg); }

/* 滚动后白底 */
.navbar.scrolled .lang-btn {
    color: var(--text-dark);
    background: var(--bg-light);
    border-color: #e5e8ee;
}
.navbar.scrolled .lang-btn:hover,
.navbar.scrolled .lang-switch.open .lang-btn {
    background: #70b52c; color: #fff; border-color: #70b52c;
}

/* 下拉列表 */
.lang-dropdown {
    position: absolute; top: calc(100% + 10px); right: 0;
    min-width: 140px;
    background: #fff;
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    padding: 6px;
    opacity: 0; visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    border-top: 3px solid var(--primary);
    z-index: 1100;
}
.lang-switch.open .lang-dropdown {
    opacity: 1; visibility: visible; transform: translateY(0);
}
.lang-option {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 14px; font-weight: 500;
    color: var(--text-dark);
    cursor: pointer;
    border: none; background: none;
    width: 100%; text-align: left;
    font-family: inherit;
    transition: background 0.15s ease, color 0.15s ease;
}
.lang-option:hover { background: var(--bg-light); color: var(--primary); }
.lang-option.active { color: #70b52c; font-weight: 600; }
.lang-option .lang-flag { font-size: 18px; line-height: 1; }
.lang-option .lang-check {
    margin-left: auto;
    font-size: 11px; color: #70b52c;
    opacity: 0; transition: opacity 0.15s ease;
}
.lang-option.active .lang-check { opacity: 1; }

/* 移动端：语言切换仍显示 */
@media (max-width: 900px) {
    .lang-btn { height: 36px; padding: 0 12px 0 10px; font-size: 12px; }
    .lang-btn .fa-globe { font-size: 13px; }
}

/* 移动端汉堡 */
.mobile-toggle {
    display: none;
    width: 40px; height: 40px;
    flex-direction: column; justify-content: center; align-items: center;
    gap: 5px; cursor: pointer;
    background: transparent; border: none; padding: 0;
}
.mobile-toggle:hover { background: transparent; }
.mobile-toggle span {
    display: block; width: 22px; height: 2px;
    background: #fff; border-radius: 2px;
    transition: all var(--transition);
}
.navbar.scrolled .mobile-toggle span,
.navbar.scrolled .mobile-toggle span:nth-child(1),
.navbar.scrolled .mobile-toggle span:nth-child(2),
.navbar.scrolled .mobile-toggle span:nth-child(3) { background: var(--text-dark); }
.mobile-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== 搜索弹窗（精致版） ========== */
.search-overlay {
    position: fixed; inset: 0; z-index: 2000;
    /* 深色渐变遮罩 —— 提高不透明度替代 backdrop-filter 模糊，避免 GPU 重绘卡顿 */
    background:
        radial-gradient(ellipse at 50% 30%, rgba(26,95,160,0.45) 0%, rgba(0,0,0,0.92) 55%);
    display: flex; align-items: center; justify-content: center;
    padding: 24px;
    opacity: 0; visibility: hidden;
    transition: opacity 0.28s ease, visibility 0s linear 0.28s;
    will-change: opacity;
}
.search-overlay.active {
    opacity: 1; visibility: visible;
    transition: opacity 0.28s ease, visibility 0s linear 0s;
}

/* 关闭按钮 —— 悬浮右上角 */
.search-close {
    position: absolute; top: 28px; right: 32px;
    width: 44px; height: 44px; border-radius: 50%;
    background: rgba(255,255,255,0.12);
    color: rgba(255,255,255,0.9);
    border: 1px solid rgba(255,255,255,0.2);
    cursor: pointer; font-size: 18px;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.25s ease;
    opacity: 0; transform: scale(0.8);
}
.search-overlay.active .search-close {
    opacity: 1; transform: scale(1);
    transition-delay: 0.25s;
}
.search-close:hover {
    background: rgba(255,255,255,0.2);
    transform: rotate(90deg) scale(1.05);
    border-color: rgba(255,255,255,0.35);
}

/* 搜索主卡片 */
.search-box {
    width: 100%; max-width: 640px;
    background: #fff;
    border-radius: 20px;
    box-shadow:
        0 24px 60px rgba(0,0,0,0.4),
        0 0 0 1px rgba(255,255,255,0.1);
    overflow: hidden;
    transform: translateY(30px) scale(0.96);
    opacity: 0;
    transition:
        transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
        opacity 0.35s ease;
}
.search-overlay.active .search-box {
    transform: translateY(0) scale(1);
    opacity: 1;
}

/* 卡片头部 */
.search-header {
    padding: 28px 36px 0;
}
.search-header h3 {
    font-size: 20px; font-weight: 600;
    color: var(--primary-dark);
    display: flex; align-items: center; gap: 10px;
}
.search-header h3 i {
    color: #70b52c;
    font-size: 18px;
}
.search-header p {
    font-size: 13px; color: var(--text-muted);
    margin-top: 6px;
    margin-bottom: 22px;
}

/* 输入框区 */
.search-input-wrap {
    position: relative;
    margin: 0 36px;
    background: var(--bg-light);
    border: 2px solid transparent;
    border-radius: 14px;
    transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.search-input-wrap:focus-within {
    background: #fff;
    border-color: rgba(26,95,160,0.35);
    box-shadow: none;
}
.search-icon {
    position: absolute; left: 22px; top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    color: var(--primary);
    opacity: 0.6;
    transition: opacity 0.25s ease;
}
.search-input-wrap:focus-within .search-icon { opacity: 1; }
.search-input,
.search-input:focus,
.search-input:focus-visible {
    width: 100%; height: 64px;
    padding: 0 72px 0 56px;
    border: none; outline: none;
    font-size: 16px;
    color: var(--text-dark);
    background: transparent;
    font-family: inherit;
}
.search-input-wrap:focus-within,
.search-input-wrap:focus-within:focus-visible {
    outline: none;
}
.search-input::placeholder {
    color: #b5bcc8;
}
.search-submit {
    position: absolute; right: 8px; top: 50%;
    transform: translateY(-50%);
    width: 48px; height: 48px; border-radius: 12px;
    border: none; cursor: pointer;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff; font-size: 16px;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 12px rgba(26,95,160,0.3);
    transition: background 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.search-submit:hover {
    transform: translateY(-50%) translateX(-2px);
    box-shadow: 0 6px 20px rgba(26,95,160,0.45);
}

/* 热门搜索 + 快捷键区 */
.search-body {
    padding: 28px 36px 0;
}
.suggest-title {
    display: flex; align-items: center; gap: 8px;
    font-size: 13px; font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 14px;
    letter-spacing: 0.5px;
}
.suggest-title i {
    color: #ff6b35;
    font-size: 14px;
}
.suggest-tags {
    display: flex; flex-wrap: wrap; gap: 10px;
}
.suggest-tags .tag {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px;
    border-radius: 24px;
    background: #f2f5f9;
    color: var(--text-dark);
    font-size: 13px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}
.suggest-tags .tag i {
    font-size: 10px;
    color: var(--text-muted);
    transition: color 0.2s ease;
}
.suggest-tags .tag:hover {
    background: #fff;
    color: var(--primary);
    border-color: rgba(26,95,160,0.25);
    box-shadow: 0 4px 12px rgba(26,95,160,0.1);
    transform: translateY(-1px);
}
.suggest-tags .tag:hover i { color: #70b52c; }

/* 快捷键提示 */
.search-shortcuts {
    display: flex; gap: 24px; flex-wrap: wrap;
    justify-content: flex-end;
    padding: 18px 36px;
    margin-top: 20px;
    border-top: 1px solid #eef0f5;
    background: #fafbfd;
    font-size: 12px;
    color: var(--text-muted);
}
.search-shortcuts span {
    display: inline-flex; align-items: center; gap: 6px;
}
.search-shortcuts kbd {
    display: inline-block;
    padding: 2px 7px;
    font-size: 11px;
    font-family: inherit;
    color: var(--text-dark);
    background: #fff;
    border: 1px solid #e0e4eb;
    border-radius: 4px;
    box-shadow: 0 1px 0 #d5d9e2;
    line-height: 1;
}

/* ========== Cookie 同意横幅 ========== */
.cookie-banner {
    position: fixed; bottom: 24px; left: 50%;
    transform: translateX(-50%) translateY(120%);
    width: calc(100% - 48px); max-width: 960px;
    background: #fff;
    border-radius: 16px;
    box-shadow:
        0 12px 40px rgba(0,0,0,0.18),
        0 0 0 1px rgba(0,0,0,0.04);
    padding: 18px 20px;
    z-index: 1500;
    display: flex; align-items: center; gap: 16px;
    animation: cookieSlideUp 0.55s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    animation-delay: 0.4s;
}
@keyframes cookieSlideUp {
    to { transform: translateX(-50%) translateY(0); }
}
.cookie-banner[hidden] { display: none; }

/* 左侧 Cookie 图标 */
.cookie-icon {
    flex-shrink: 0;
    width: 48px; height: 48px; border-radius: 12px;
    background: linear-gradient(135deg, #ff9a6a 0%, #ff6b35 100%);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    box-shadow: 0 4px 14px rgba(255,107,53,0.3);
}

/* 文本 */
.cookie-content { flex: 1; min-width: 0; }
.cookie-content p {
    font-size: 13.5px;
    color: var(--text-dark);
    line-height: 1.7;
    margin: 0;
}
.cookie-content a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: color var(--transition);
}
.cookie-content a:hover { color: #70b52c; }

/* 按钮区 */
.cookie-actions { flex-shrink: 0; display: flex; gap: 10px; }
.btn-cookie {
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 13.5px; font-weight: 500;
    cursor: pointer; border: none;
    display: inline-flex; align-items: center; gap: 6px;
    transition: all var(--transition);
    font-family: inherit;
    white-space: nowrap;
}
.btn-cookie--primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(26,95,160,0.25);
}
.btn-cookie--primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(26,95,160,0.35);
}
.btn-cookie--ghost {
    background: var(--bg-light);
    color: var(--text-dark);
    border: 1px solid #e6eaf0;
}
.btn-cookie--ghost:hover {
    
    color: var(--primary);
    border-color: rgba(26,95,160,0.3);
}

/* "自定义 ›" 小链接（移动端隐藏） */
.cookie-custom-link {
    flex-shrink: 0;
    background: none; border: none; cursor: pointer;
    color: var(--text-muted); font-size: 13px;
    padding: 8px 4px;
    transition: color var(--transition);
}
.cookie-custom-link:hover { color: var(--primary); }

/* ========== Cookie 自定义弹窗 ========== */
.cookie-modal {
    position: fixed; inset: 0; z-index: 1600;
    display: flex; align-items: center; justify-content: center;
    padding: 24px;
}
.cookie-modal[hidden] { display: none; }
.cookie-modal-backdrop {
    position: absolute; inset: 0;
    background: rgba(0,0,0,0.65);
    animation: fadeIn 0.25s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.cookie-modal-card {
    position: relative; z-index: 1;
    width: 100%; max-width: 520px; max-height: 85vh; overflow-y: auto;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    animation: cookiePopIn 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes cookiePopIn {
    from { opacity: 0; transform: scale(0.92) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.cookie-modal-header {
    padding: 24px 28px 16px;
    display: flex; align-items: center; justify-content: space-between;
}
.cookie-modal-header h4 {
    font-size: 17px; font-weight: 600;
    color: var(--text-dark);
    display: flex; align-items: center; gap: 10px;
}
.cookie-modal-header h4 i { color: var(--primary); }
.cookie-modal-close {
    width: 32px; height: 32px; border-radius: 50%;
    background: transparent; border: none; cursor: pointer;
    color: var(--text-muted); font-size: 16px;
    display: flex; align-items: center; justify-content: center;
    transition: all var(--transition);
}
.cookie-modal-close:hover {
    background: var(--bg-light);
    color: var(--text-dark);
}

.cookie-modal-body { padding: 0 28px 20px; }
.cookie-modal-intro {
    font-size: 13px; color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
}

/* 每个 Cookie 分类开关 */
.cookie-toggle {
    display: flex; align-items: center; gap: 16px;
    padding: 16px 0;
    border-top: 1px solid #f0f3f8;
    position: relative;
}
.cookie-toggle:first-of-type { border-top: none; }
.cookie-toggle-info { flex: 1; min-width: 0; }
.cookie-toggle-title {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 14.5px; font-weight: 600;
    color: var(--text-dark);
}
.cookie-toggle-desc {
    display: block; margin-top: 3px;
    font-size: 12.5px; color: var(--text-muted);
}
.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 10.5px; font-weight: 500;
    border-radius: 10px;
    letter-spacing: 0.3px;
}
.badge--required {
    background: #fff4e6; color: #d97706;
}

/* 自定义 Switch 开关 */
.cookie-toggle input[type="checkbox"] {
    position: absolute; opacity: 0; width: 0; height: 0;
}
.cookie-toggle-slider {
    flex-shrink: 0;
    position: relative;
    width: 46px; height: 26px; border-radius: 13px;
    background: #d5dae3;
    transition: background 0.25s ease;
    cursor: pointer;
}
.cookie-toggle-slider::before {
    content: '';
    position: absolute; top: 3px; left: 3px;
    width: 20px; height: 20px; border-radius: 50%;
    background: #fff;
    box-shadow: 0 1px 4px rgba(0,0,0,0.15);
    transition: transform 0.25s ease;
}
.cookie-toggle input:checked + .cookie-toggle-slider {
    background: var(--primary);
}
.cookie-toggle input:checked + .cookie-toggle-slider::before {
    transform: translateX(20px);
}
.cookie-toggle input:disabled + .cookie-toggle-slider {
    background: #eef0f5;
    cursor: not-allowed;
}
.cookie-toggle input:disabled:checked + .cookie-toggle-slider {
    background: #a5b7cc;
}

.cookie-modal-footer {
    padding: 18px 28px;
    border-top: 1px solid #f0f3f8;
    display: flex; gap: 12px; justify-content: flex-end;
    background: #fafbfd;
}

/* ========== 悬浮 Cookie 设置按钮 ========== */
.cookie-settings-btn {
    position: fixed; bottom: 24px; right: 24px;
    width: 44px; height: 44px; border-radius: 50%;
    background: #fff;
    color: var(--text-muted);
    border: 1px solid #e6eaf0;
    cursor: pointer; font-size: 18px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    display: flex; align-items: center; justify-content: center;
    z-index: 1400;
    transition: all var(--transition);
}
.cookie-settings-btn[hidden] { display: none; }
.cookie-settings-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26,95,160,0.15);
}

/* ========== Cookie 响应式 ========== */
@media (max-width: 768px) {
    .cookie-banner {
        flex-wrap: wrap;
        gap: 12px;
        padding: 16px;
        bottom: 16px;
        width: calc(100% - 32px);
    }
    .cookie-custom-link { display: none; }
    .cookie-actions { width: 100%; justify-content: stretch; }
    .btn-cookie { flex: 1; justify-content: center; padding: 10px 14px; font-size: 13px; }
    .cookie-icon { width: 40px; height: 40px; font-size: 18px; border-radius: 10px; }
    .cookie-modal-header { padding: 20px 22px 12px; }
    .cookie-modal-body { padding: 0 22px 16px; }
    .cookie-modal-footer { padding: 14px 22px; }
}

/* ========== 全屏 Banner ========== */
.hero {
    position: relative; min-height: 100vh;
    background: #0f1e37;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.hero-video {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    object-fit: cover;
    z-index: 0;
    pointer-events: none;
}
.hero::before {
    content: ''; position: absolute; inset: 0;
    z-index: 1;
    background: linear-gradient(135deg, rgb(15 30 55 / 24%) 0%, rgb(26 95 160 / 39%) 100%), radial-gradient(ellipse at 20% 80%, rgb(37 176 56 / 13%) 0%, transparent 50%), radial-gradient(ellipse at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 40%);
}
/* 装饰性水波纹 */
.hero::after {
    content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
    z-index: 1;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 120' preserveAspectRatio='none'><path fill='%23ffffff' fill-opacity='0.08' d='M0,64 C240,128 480,0 720,32 C960,64 1200,128 1440,64 L1440,120 L0,120 Z'/><path fill='%23ffffff' fill-opacity='0.12' d='M0,80 C240,32 480,112 720,80 C960,48 1200,32 1440,80 L1440,120 L0,120 Z'/></svg>") center/cover no-repeat;
    animation: wave 8s ease-in-out infinite;
}
@keyframes wave {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(-20px); }
}

.hero-content {
    position: relative; z-index: 2;
    text-align: center; padding: 0 20px; max-width: 900px;
    color: #fff;
    animation: fadeUp 1s ease-out;
}
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}
.hero-badge {
    display: inline-block;
    padding: 6px 18px; margin-bottom: 24px;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 30px;
    background: rgba(106 178 44);
    backdrop-filter: blur(4px);
    font-size: 13px; letter-spacing: 3px;
    color: rgba(255,255,255,0.9);
}
.hero h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 700; line-height: 1.25;
    margin-bottom: 24px;
    text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.hero h1 .accent { color: #70b52c; }
.hero-desc {
    font-size: clamp(15px, 2vw, 18px);
    color: rgba(255,255,255,0.85);
    margin-bottom: 40px;
    line-height: 1.8;
}
.hero-buttons {
    display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
}
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 36px; border-radius: 50px;
    font-size: 15px; font-weight: 500;
    cursor: pointer; border: none;
    transition: all var(--transition);
}
.btn-primary {
    background: #70b52c; color: #fff;
    box-shadow: 0 4px 20px rgba(37,176,135,0.4);
}
.btn-primary:hover {
    background: #1f9472; transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(37,176,135,0.5);
}
.btn-outline {
    background: transparent; color: #fff;
    border: 2px solid rgba(255,255,255,0.5);
}
.btn-outline:hover {
    background: #fff; color: var(--primary); border-color: #fff;
    transform: translateY(-2px);
}

/* 向下滚动提示 */
.scroll-indicator {
    position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
    z-index: 2; color: rgba(255,255,255,0.7);
    animation: bounce 2s infinite;
}
.scroll-indicator .fa-chevron-down { font-size: 20px; }
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-12px); }
    60% { transform: translateX(-50%) translateY(-6px); }
}

/* ========== 关于我们 About ========== */
.about {
    padding: 100px 20px;
    background: var(--bg-white);
}
.about-wrap {
    max-width: var(--container);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 80px;
    align-items: start;
}

/* 左侧标题区 */
.about-aside {
    padding-top: 12px;
}
.about-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 18px;
}
.about-title {
    font-size: 48px;
    font-weight: 700;
    color: #333;
    line-height: 1.3;
    letter-spacing: -0.5px;
    margin-bottom: 22px;
}
.about-bar {
    width: 40px; height: 3px;
    background: #70b52c;
    border-radius: 2px;
    margin-bottom: 24px;
}
.about-desc {
    font-size: 14.5px;
    color: #6b7280;
    line-height: 1.8;
    margin-bottom: 32px;
}
.about-more {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 13.5px; font-weight: 500;
    color: var(--primary);
    padding: 12px 28px;
    border: 1px solid var(--primary);
    border-radius: 50px;
    transition: all var(--transition);
}
.about-more:hover {
    background: var(--primary);
    color: #fff;
    transform: translateX(4px);
    box-shadow: 0 4px 16px rgba(26,95,160,0.25);
}
.about-more i {
    font-size: 11px;
    transition: transform var(--transition);
}
.about-more:hover i { transform: translateX(3px); }

/* 右侧内容 */
.about-main p {
    font-size: 15.5px;
    color: #374151;
    line-height: 2;
    margin-bottom: 20px;
    text-align: justify;
}
.about-main p:first-child {
    text-indent: 2em;
}
.about-main p:last-child {
    margin-bottom: 0;
}

/* About 响应式 */
@media (max-width: 1024px) {
    .about-wrap { grid-template-columns: 1fr; gap: 48px; }
    .about-aside { text-align: center; padding-top: 0; }
    .about-bar { margin: 0 auto 24px; }
    .about-title { font-size: 30px; }
}
@media (max-width: 768px) {
    .about { padding: 64px 20px; }
    .about-title { font-size: 24px; }
    .about-desc { font-size: 14px; margin-bottom: 24px; }
    .about-main p { font-size: 15px; line-height: 1.9; }
}

/* ========== 核心数据选项卡（About 内部 · 纯净版） ========== */
.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 40px;
}
.stat-card {
    background: none;
    border: none;
    border-radius: 0;
    padding: 24px 16px;
    text-align: center;
    transition: transform 0.3s ease;
    position: relative;
    overflow: visible;
}
.stat-card:hover {
    transform: translateY(-4px);
}
.stat-card::before { display: none; }

.stat-card-icon {
    width: 56px; height: 56px;
    margin: 0 auto 14px;
    display: flex; align-items: center; justify-content: center;
}
.stat-card-icon img {
    width: 40px; height: 40px;
    object-fit: contain;
}

.stat-card-num {
    font-size: 38px;
    font-weight: 700;
    line-height: 1;
    color: #333;
    letter-spacing: -0.5px;
    font-variant-numeric: tabular-nums;
    margin-bottom: 8px;
}
.stat-card-num .suffix {
    font-size: 18px;
    font-weight: 500;
    margin-left: 4px;
    color: var(--primary);
}
.stat-card-label {
    font-size: 13.5px;
    color: var(--text-muted);
    letter-spacing: 1px;
}

/* about-stats 响应式 */
@media (max-width: 768px) {
    .about-stats { grid-template-columns: 1fr; gap: 12px; margin-top: 28px; }
    .stat-card { padding: 20px 16px; display: flex; align-items: center; gap: 16px; text-align: left; }
    .stat-card-icon { margin: 0; flex-shrink: 0; }
    .stat-card-num { font-size: 28px; margin-bottom: 4px; }
    .stat-card-label { font-size: 13px; }
}

/* ========== 产品与服务 Products ========== */
.products {
    padding: 100px 20px;
    background: var(--bg-light);
}
.products-wrap {
    max-width: var(--container);
    margin: 0 auto;
}

/* 标题区 */
.products-header {
    text-align: center;
    margin-bottom: 56px;
}
.products-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 16px;
}
.products-title {
    font-size: 40px;
    font-weight: 700;
    color: #333;
    line-height: 1.3;
    margin-bottom: 16px;
}
.products-sub {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.8;
    max-width: 620px;
    margin: 0 auto;
}

/* 三列卡片网格（正方形） */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.prod-card {
    position: relative;
    display: block;
    aspect-ratio: 1 / 1;       /* 正方形 */
    border-radius: 16px;
    overflow: hidden;
    background: #e6ebf3;
    cursor: pointer;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}
.prod-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.14);
}
.prod-card:focus-visible {
    outline: 3px solid #70b52c;
    outline-offset: 3px;
}

/* 背景图片层 */
.prod-img {
    position: absolute; inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.prod-card:hover .prod-img {
    transform: scale(1.08);
}

/* 底部标题条（始终可见） */
.prod-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px 24px;
    /* background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgb(49 127 49) 100%); */
    color: #29b81f;
}
.prod-info h3 {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* hover 遮罩层 —— 毛玻璃效果 */
.prod-hover {
    position: absolute; inset: 0;
    background: rgba(255,255,255,0.12);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex; align-items: center; justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.28s ease, visibility 0s linear 0.28s;
}
.prod-card:hover .prod-hover,
.prod-card:focus-within .prod-hover {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.28s ease, visibility 0s linear 0s;
}

/* 圆角 tips 卡片 —— 毛玻璃 */
.prod-tips {
    width: calc(100% - 40px);
    padding: 28px 24px 24px;
    background: rgba(255,255,255,0.25);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: none;
    border-radius: 14px;
    color: #1a3a5c;
    text-align: center;
    transform: translateY(16px);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
.prod-card:hover .prod-tips,
.prod-card:focus-within .prod-tips {
    transform: translateY(0);
}
.prod-tips h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}
/* 二级栏目列表 —— 一行 2 个，自动换行 */
.prod-sub-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 16px;
    max-height: 140px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(26,58,92,0.3) transparent;
}
.prod-sub-list::-webkit-scrollbar { width: 4px; }
.prod-sub-list::-webkit-scrollbar-thumb {
    background: rgba(26,58,92,0.3);
    border-radius: 2px;
}
.prod-sub-item {
    display: block;
    font-size: 12px;
    padding: 7px 10px;
    background: rgba(255,255,255,0.35);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: none;
    border-radius: 6px;
    color: #1a3a5c;
    text-decoration: none;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.prod-sub-item:hover {
    background: rgba(112,181,44,0.9);
    color: #fff;
    transform: translateY(-1px);
}
.prod-tips-btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 22px;
    background: #70b52c;
    color: #fff;
    border-radius: 50px;
    font-size: 13px; font-weight: 500;
    transition: all 0.25s ease;
}
.prod-tips-btn:hover {
    background: #fff;
    color: var(--primary);
    transform: translateX(2px);
}
.prod-tips-btn i {
    font-size: 11px;
    transition: transform 0.25s ease;
}
.prod-tips-btn:hover i { transform: translateX(3px); }

/* 响应式 */
@media (max-width: 1024px) {
    .products-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .products-title { font-size: 32px; }
}
@media (max-width: 768px) {
    .products { padding: 64px 20px; }
    .products-header { margin-bottom: 40px; }
    .products-title { font-size: 26px; }
    .products-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        max-width: 360px;
        margin: 0 auto;
    }
    .prod-card { aspect-ratio: 4 / 3; }
}

/* ========== 应用领域 Applications（手风琴式） ========== */
.apps {
    padding: 100px 20px;
    background: var(--bg-white);
}
.apps-wrap {
    max-width: var(--container);
    margin: 0 auto;
}

/* 标题区 */
.apps-header {
    text-align: center;
    margin-bottom: 56px;
}
.apps-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 16px;
}
.apps-title {
    font-size: 40px;
    font-weight: 700;
    color: #333;
    line-height: 1.3;
    margin-bottom: 16px;
}
.apps-sub {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.8;
    max-width: 620px;
    margin: 0 auto;
}

/* 横向手风琴：默认第一张展开更宽，hover 其他展开 */
.apps-list {
    display: flex;
    height: 420px;          /* 固定高度，flex-grow 只控制宽度 */
    gap: 0;
    border-radius: 16px;
    overflow: hidden;
}
.app-card {
    position: relative;
    flex: 1;                /* 基准：等宽（收起态） */
    cursor: pointer;
    overflow: hidden;
    transition: flex 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}
/* 默认第一张展开（更宽） */
.app-card:first-child { flex: 2.6; }

/* hover 任意卡片 → 它展开 */
.app-card:hover { flex: 2.6; }
/* hover 列表时，非 hover 的第一张自动收起 */
.apps-list:hover .app-card:first-child:not(:hover) { flex: 1; }

/* 图片 —— 铺满卡片 */
.app-img {
    position: absolute; inset: 0;
    background: #dbe4ee center/cover no-repeat;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 1;
}
/* 展开态图片放大 */
.app-card:first-child .app-img,
.app-card:hover .app-img {
    transform: scale(1.08);
}

/* 底部渐变遮罩 */
.app-img::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(180deg,
        rgba(0,0,0,0) 20%,
        rgba(0,0,0,0.4) 60%,
        rgba(0,0,0,0.8) 100%);
    transition: background 0.5s ease;
}
/* 展开态遮罩加深 */
.app-card:first-child .app-img::after,
.app-card:hover .app-img::after {
    background: linear-gradient(180deg,
        rgba(26,95,160,0.1) 0%,
        rgba(26,95,160,0.5) 55%,
        rgba(19,71,120,0.9) 100%);
}

/* 文字层 */
.app-text {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    padding: 20px 22px 24px;
    z-index: 2;
    color: #fff;
    white-space: nowrap;
}
.app-text h3 {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    letter-spacing: 0.5px;
    margin-bottom: 0;
    transition: transform 0.35s ease, font-size 0.35s ease;
}

/* 描述 —— 默认收起，展开态显示 */
.app-desc {
    margin-top: 0;
    font-size: 13px;
    line-height: 1.8;
    color: rgba(255,255,255,0.92);
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    white-space: normal;
    transition:
        max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1),
        opacity 0.4s ease,
        margin-top 0.4s ease;
}
/* 展开态：描述滑出 */
.app-card:first-child .app-desc,
.app-card:hover .app-desc {
    max-height: 120px;
    opacity: 1;
    margin-top: 10px;
}

/* 移动端 */
@media (max-width: 1024px) {
    .apps { padding: 80px 20px; }
    .apps-title { font-size: 32px; }
    .apps-list { height: 340px; }
}
@media (max-width: 768px) {
    .apps { padding: 64px 20px; }
    .apps-header { margin-bottom: 40px; }
    .apps-title { font-size: 26px; }
    .apps-list {
        flex-direction: column;
        height: auto;
        gap: 12px;
        border-radius: 0;
    }
    .app-card,
    .app-card:first-child {
        flex: none;
        height: 180px;
    }
    .app-card:hover { flex: none; transform: none; }
}

/* ========== 使命·愿景·目的（交替图文） ========== */
.mtv {
    padding: 100px 20px;
    background: var(--bg-white);
}
.mtv-wrap {
    max-width: var(--container);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 90px;
    align-items: start;
}

/* 左侧：大标题 + 描述 */
.mtv-intro {
    position: sticky;
    top: 100px;
    padding-top: 8px;
}
.mtv-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 18px;
}
.mtv-intro-title {
    font-size: 48px;
    font-weight: 700;
    color: #333;
    line-height: 1.3;
    margin-bottom: 24px;
    white-space: normal;
    word-break: break-word;
    overflow-wrap: break-word;
}
.mtv-intro-desc {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.9;
    text-align: justify;
}

/* 右侧：列表容器 */
.mtv-list {
    display: flex;
    flex-direction: column;
    margin: 0 60px;
    gap: 0;
}

/* 每一行：纯文本条目 */
.mtv-row {
    display: block;
    padding: 32px 0;
    border-bottom: 1px solid rgba(0,0,0,0.08);
    position: relative;
    transition: background 0.25s ease, padding-left 0.25s ease;
}
.mtv-row:hover {
   
    padding-left: 12px;
}
.mtv-row:first-child { padding-top: 0; }
.mtv-row:last-of-type { border-bottom: none; }

/* 去掉所有交替/反向行规则 */
.mtv-row--reverse,
.mtv-list .mtv-row:nth-child(even) { direction: ltr; }

/* 文字区 */
.mtv-text {
    padding: 0;
}
.mtv-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 14px;
    padding: 4px 12px;
    background: rgba(112,181,44,0.1);
    border-radius: 20px;
}
.mtv-text h2 {
    font-size: 26px;
    font-weight: 700;
    color: #333;
    line-height: 1.4;
    letter-spacing: -0.3px;
    margin-bottom: 12px;
    position: relative;
    
}

.mtv-text p {
    font-size: 15px;
    line-height: 2;
    color: var(--text-muted);
    text-align: justify;
}

/* CTA 按钮 */
.mtv-cta {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid rgba(0,0,0,0.08);
    display: flex;
    justify-content: flex-end;
}
.mtv-cta .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 36px;
    font-size: 15px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--primary) 0%, #1a6fa0 100%);
    box-shadow: 0 6px 20px rgba(26,95,160,0.25);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.mtv-cta .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(26,95,160,0.35);
}

/* 响应式 */
@media (max-width: 1024px) {
    .mtv { padding: 80px 20px; }
    .mtv-wrap {
        grid-template-columns: 1fr;
        gap: 56px;
    }
    .mtv-intro { position: static; padding-top: 0; }
    .mtv-row { padding: 28px 0; }
    .mtv-text h2 { font-size: 22px; }
    .mtv-intro-title { font-size: 32px; }
}
@media (max-width: 768px) {
    .mtv { padding: 64px 20px; }
    .mtv-wrap { gap: 40px; }
    .mtv-row { padding: 24px 0; }
    .mtv-row:hover { padding-left: 0; background: transparent; }
    .mtv-text h2 { font-size: 20px; }
    .mtv-intro-title { font-size: 28px; }
    .mtv-intro-desc { font-size: 14px; }
    .mtv-en { margin-bottom: 12px; }
    .mtv-text p { font-size: 14px; }
    .mtv-cta { margin-top: 28px; padding-top: 24px; }
    .mtv-cta .btn-primary { padding: 12px 28px; font-size: 14px; }
}

/* ========== 公司优势 ========== */
.adv {
    padding: 100px 20px;
    background: var(--bg-light);
}
.adv-wrap {
    max-width: var(--container);
    margin: 0 auto;
}
.adv-head {
    text-align: center;
    margin-bottom: 60px;
}
.adv-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 14px;
}
.adv-title {
    font-size: 40px;
    font-weight: 700;
    color: #333;
    line-height: 1.3;
}

/* 四列网格 */
.adv-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

/* 卡片 */
.adv-card {
    
    
    border-radius: 16px;
    padding: 40px 28px 36px;
    text-align: center;
    transition: all 0.3s ease;
}
.adv-card:hover {
    border-color: rgba(26,95,160,0.25);
    box-shadow: 0 12px 36px rgba(26,95,160,0.1);
    transform: translateY(-4px);
}

/* 图标：圆形蓝底白箭 */
.adv-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1a5fa0 0%, #3a7fc0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 28px;
    box-shadow: 0 6px 20px rgba(26,95,160,0.25);
}

/* 标题居中 */
.adv-card-title {
    font-size: 18px;
    font-weight: 700;
    color: #333;
    line-height: 1.4;
    margin-bottom: 16px;
    text-align: center;
}
/* 描述靠左 */
.adv-card-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.9;
    text-align: left;
}

/* 响应式 */
@media (max-width: 1024px) {
    .adv { padding: 80px 20px; }
    .adv-title { font-size: 32px; }
    .adv-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
}
@media (max-width: 768px) {
    .adv { padding: 64px 20px; }
    .adv-title { font-size: 28px; }
    .adv-head { margin-bottom: 40px; }
    .adv-grid { grid-template-columns: 1fr; gap: 16px; }
    .adv-card { padding: 32px 24px; }
}

/* ========== 客户案例（左文 + 右无限滚动） ========== */
.cases {
    padding: 100px 20px;
    background: var(--bg-light);
}
.cases-wrap {
    max-width: var(--container);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 64px;
    align-items: center;
}

/* 左侧文字 */
.cases-text {
    /* sticky 让左侧在右侧滚动时保持锚定感 */
    position: sticky;
    top: 100px;
}
.cases-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 16px;
}
.cases-title {
    font-size: 40px;
    font-weight: 700;
    color: #333;
    line-height: 1.3;
    margin-bottom: 16px;
}
.cases-sub {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 32px;
}
.cases-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: #70b52c;
    
    padding-bottom: 2px;
    transition: gap 0.25s ease;
}
.cases-link:hover { gap: 12px; }

/* 右侧 Marquee 容器 */
.cases-marquee {
    overflow: hidden;
    mask-image: linear-gradient(90deg, transparent 0%, #000 8%, #000 92%, transparent 100%);
    -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 8%, #000 92%, transparent 100%);
}
/* 无限轨道 */
.cases-track {
    display: flex;
    gap: 20px;
    width: max-content;
    animation: cases-scroll 30s linear infinite;
}
/* hover 整组暂停 */
.cases-marquee:hover .cases-track { animation-play-state: paused; }

/* 单张卡片 */
.case-card {
    position: relative;
    flex: 0 0 280px;
    aspect-ratio: 4 / 5;
    border-radius: 16px;
    overflow: hidden;
    background: #d9e2ec;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.case-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.18);
}

/* 图片层 */
.case-img {
    position: absolute; inset: 0;
    background: #cbd5e1 center/cover no-repeat;
    transition: transform 0.6s cubic-bezier(0.25,0.46,0.45,0.94);
}
.case-card:hover .case-img { transform: scale(1.06); }

/* 底部渐变遮罩 */
.case-img::after {
    content: '';
    position: absolute; inset: 0;
    
}

/* 悬浮在图片上的标题层 */
.case-caption {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    padding: 20px 20px 22px;
    z-index: 2;
    color: #fff;
    display: flex; flex-direction: column;
    gap: 4px;
}
.case-tag {
    font-size: 12px;
    color: rgba(255,255,255,0.8);
    letter-spacing: 2px;
}
.case-name {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
}

/* 滚动动画：移动半宽（两组一组的宽度） */
@keyframes cases-scroll {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* 响应式 */
@media (max-width: 1024px) {
    .cases { padding: 80px 20px; }
    .cases-wrap {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .cases-text { position: static; text-align: center; }
    .cases-title { font-size: 32px; }
}
@media (max-width: 768px) {
    .cases { padding: 64px 20px; }
    .cases-title { font-size: 26px; }
    .case-card { flex-basis: 220px; aspect-ratio: 4 / 5; }
    .cases-track { gap: 14px; }
    .cases-marquee {
        mask-image: linear-gradient(90deg, transparent 0%, #000 12%, #000 88%, transparent 100%);
        -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 12%, #000 88%, transparent 100%);
    }
}

/* ========== 常见问题（左图右文） ========== */
.faq {
    padding: 100px 20px;
    background: var(--bg-white);
}
.faq-wrap {
    max-width: var(--container);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 80px;
    align-items: start;
}

/* 左侧 */
.faq-side {
    position: sticky;
    top: 100px;
}
.faq-img {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 16px;
    background: #e6ebf3 center/cover no-repeat;
    box-shadow: 0 8px 28px rgba(0,0,0,0.08);
    margin-bottom: 24px;
}
.faq-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 14px;
}
.faq-title {
    font-size: 36px;
    font-weight: 700;
    color: #333;
    line-height: 1.3;
    margin-bottom: 16px;
}
.faq-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.9;
}

/* 右侧问答列表 */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 28px;
}
.faq-item {
    padding: 28px 32px;
    background: #fff;
    border: 1px solid #eef0f5;
    border-radius: 14px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
    position: relative;
}
.faq-item::before {
    content: '';
    position: absolute;
    left: 0; top: 24px; bottom: 24px;
    width: 3px;
    background: linear-gradient(180deg, var(--primary) 0%, #70b52c 100%);
    border-radius: 2px;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.faq-item:hover {
    border-color: rgba(26,95,160,0.25);
    box-shadow: 0 8px 24px rgba(26,95,160,0.08);
    transform: translateY(-2px);
}
.faq-item:hover::before { opacity: 1; }
.faq-item h3 {
    font-size: 17px;
    font-weight: 600;
    color: #70b52c;
    margin-bottom: 12px;
    padding-left: 2px;
    display: flex; align-items: center; gap: 12px;
}
.faq-item h3::before {
    content: 'Q';
    display: inline-flex; align-items: center; justify-content: center;
    width: 26px; height: 26px;
    font-size: 13px; font-weight: 700;
    color: #70b52c; background: #70b52c2b;
    border-radius: 50%;
    flex-shrink: 0;
}
.faq-item p {
    font-size: 14.5px;
    line-height: 1.9;
    color: var(--text-muted);
    padding-left: 38px;
}

/* ========== 合作客户 ========== */
.partners {
    padding: 100px 20px;
    background: var(--bg-light);
}
.partners-wrap {
    max-width: var(--container);
    margin: 0 auto;
    text-align: center;
}
.partners-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: #70b52c;
    letter-spacing: 4px;
    margin-bottom: 14px;
}
.partners-title {
    font-size: 40px;
    font-weight: 700;
    color: #333;
    line-height: 1.3;
    margin-bottom: 56px;
}

/* 栏目描述 */
.partners-sub {
    max-width: 640px;
    margin: 0 auto 48px;
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-muted);
}

/* 无限滚动：容器 */
.partners-marquee {
    overflow: hidden;
    mask-image: linear-gradient(90deg, transparent 0%, #000 8%, #000 92%, transparent 100%);
    -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 8%, #000 92%, transparent 100%);
}
/* 轨道（flex 一行，动画平移 50% 即可无缝循环） */
.partners-track {
    display: flex;
    gap: 20px;
    width: max-content;
    animation: partners-scroll 35s linear infinite;
}
.partners-marquee:hover .partners-track { animation-play-state: paused; }

.partner-card {
    flex: 0 0 auto;
    min-width: 200px;
    aspect-ratio: 16 / 7;
    background: #fff;
    border: 1px solid #eef0f5;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}
.partner-card:hover {
    border-color: rgba(26,95,160,0.25);
    box-shadow: 0 8px 24px rgba(26,95,160,0.1);
    transform: translateY(-3px);
}
.partner-card img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    opacity: 0.7;
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.partner-card:hover img { opacity: 1; transform: scale(1.05); }
/* logo 缺失时显示名称 */
.partner-fallback {
    display: block;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-align: center;
    width: 100%;
}
.partner-name {
    position: absolute;
    bottom: 10px; left: 0; right: 0;
    font-size: 12px;
    color: #94a3b8;
    letter-spacing: 0.5px;
}

/* partners 无限滚动 keyframes */
@keyframes partners-scroll {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* 响应式 */
@media (max-width: 1024px) {
    .faq { padding: 80px 20px; }
    .faq-wrap { grid-template-columns: 1fr; gap: 48px; }
    .faq-side { position: static; }
    .faq-title { font-size: 30px; }
    .partners { padding: 80px 20px; }
    .partners-title { font-size: 32px; }
    .partners-sub { margin-bottom: 40px; }
    .partner-card { min-width: 180px; }
    .partners-track { gap: 16px; }
}
@media (max-width: 768px) {
    .faq { padding: 64px 20px; }
    .faq-item { padding: 22px 20px; }
    .faq-item h3 { font-size: 16px; }
    .faq-item p { font-size: 14px; padding-left: 34px; }
    .partners { padding: 64px 20px; }
    .partners-title { font-size: 26px; margin-bottom: 14px; }
    .partners-sub { margin-bottom: 32px; font-size: 14px; }
    .partner-card { min-width: 150px; padding: 10px 14px; }
    .partners-track { gap: 12px; animation-duration: 28s; }
    .partners-marquee {
        mask-image: linear-gradient(90deg, transparent 0%, #000 12%, #000 88%, transparent 100%);
        -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 12%, #000 88%, transparent 100%);
    }
}

/* ========== 主要内容区域占位 ========== */
main {
    padding: 80px 20px;
    max-width: var(--container);
    margin: 0 auto;
}
.section-placeholder {
    text-align: center; padding: 80px 20px;
    background: var(--bg-light); border-radius: 16px;
    margin-bottom: 40px;
}
.section-placeholder h2 { font-size: 28px; color: var(--primary); margin-bottom: 12px; }
.section-placeholder p { color: var(--text-muted); font-size: 14px; }

/* ========== 页脚 Footer ========== */
.footer {
    background: #0f1c2e;
    color: rgba(255,255,255,0.7);
}
.footer-top {
    padding: 72px 20px 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-inner {
    max-width: var(--container);
    margin: 0 auto;
}

/* 四列 Grid */
.footer-top .footer-inner {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 32px;
}

/* 品牌列 */
.footer-brand { padding-right: 16px; }
.footer-logo {
    display: inline-flex; align-items: center; gap: 12px;
    color: #fff; text-decoration: none;
    font-size: 18px; font-weight: 700;
    margin-bottom: 20px;
}
.footer-logo img { border-radius: 6px; }
.footer-logo span { line-height: 1.3; }
.footer-about {
    font-size: 13.5px;
    line-height: 1.9;
    color: rgba(255,255,255,0.55);
    margin-bottom: 24px;
}

/* 社交图标 */
.footer-social {
    display: flex; gap: 10px;
}
.footer-social a {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.6);
    display: flex; align-items: center; justify-content: center;
    font-size: 15px;
    transition: all 0.3s ease;
}
.footer-social a:hover {
    background: #70b52c;
    color: #fff;
    transform: translateY(-2px);
}

/* 栏目标题 */
.footer-title {
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    letter-spacing: 2px;
    margin-bottom: 14px;
}

/* 链接列表 */
.footer-list {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 2px;
}
.footer-list a {
    font-size: 13.5px;
    color: rgba(255,255,255,0.55);
    text-decoration: none;
    transition: color 0.25s ease, padding 0.25s ease;
}
.footer-list a:hover {
    color: #70b52c;
    padding-left: 4px;
}

/* 联系方式列表 */
.footer-contact {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 14px;
}
.footer-contact li {
    display: flex; gap: 10px; align-items: flex-start;
    font-size: 13.5px;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}
.footer-contact i {
    color: #70b52c;
    font-size: 14px;
    margin-top: 3px;
    flex-shrink: 0;
    width: 16px;
    text-align: center;
}
.footer-contact a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    transition: color 0.25s ease;
}
.footer-contact a:hover { color: #70b52c; }

/* 底部版权条 */
.footer-bottom {
    padding: 20px 20px;
    background: #0a1524;
}
.footer-bottom-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: nowrap;
    font-size: 12.5px;
    color: rgba(255,255,255,0.45);
    white-space: nowrap;
}
.footer-copy { margin: 0; }
.footer-icp { margin: 0; }
.footer-legal {
    list-style: none; padding: 0; margin: 0;
    display: flex; gap: 20px;
}
.footer-legal a {
    color: rgba(255,255,255,0.5);
    text-decoration: none;
    transition: color 0.25s ease;
}
.footer-legal a:hover { color: #70b52c; }

/* 响应式 */
@media (max-width: 1024px) {
    .footer-top .footer-inner {
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }
    .footer-brand { padding-right: 0; }
    .footer-about { font-size: 12.5px; }
}
@media (max-width: 768px) {
    .footer-top { padding: 56px 20px 36px; }
    .footer-top .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .footer-bottom-inner {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    .footer-legal { justify-content: center; }
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .navbar { padding: 0 20px; }
    .nav-menu > ul { gap: 2px; }
    .nav-link { padding: 10px 12px; font-size: 14px; }
    .logo-text { font-size: 15px; }
}

@media (max-width: 768px) {
    .nav-menu, .nav-actions .search-btn { display: none; }
    .mobile-toggle { display: flex; }

    /* 移动端全屏菜单 */
    .nav-menu.mobile-active {
        display: flex; flex-direction: column;
        position: fixed; top: var(--nav-h); left: 0; right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        box-shadow: var(--shadow-md);
        padding: 16px;
        max-height: calc(100vh - var(--nav-h));
        overflow-y: auto;
    }
    .nav-menu.mobile-active > ul {
        flex-direction: column;
        gap: 0;
    }
    .navbar.scrolled .nav-menu.mobile-active { top: 64px; }
    .nav-menu.mobile-active .nav-item { width: 100%; border-bottom: 1px solid #f0f0f0; }
    .nav-menu.mobile-active .nav-link {
        color: var(--text-dark); justify-content: space-between;
        padding: 14px 10px;
    }
    .nav-menu.mobile-active .nav-link::after { display: none; }
    .nav-menu.mobile-active .dropdown {
        position: static;
        opacity: 1; visibility: visible;
        transform: none; box-shadow: none;
        border-top: none; background: #f9fafb;
        padding: 0; min-width: auto; border-radius: 0;
        display: none;
    }
    .nav-menu.mobile-active .nav-item.open > .dropdown { display: block; }
    .nav-menu.mobile-active .dropdown.level-2 {
        left: auto; margin-left: 0;
    }
    .nav-menu.mobile-active .dropdown.level-2 {
        display: none;
    }
    .nav-menu.mobile-active .dropdown-item.open > .dropdown.level-2 { display: block; }
    .nav-menu.mobile-active .dropdown-link { color: var(--text-dark); padding: 12px 20px; }
    .nav-menu.mobile-active .dropdown-link:hover { background: #eef4fb; padding-left: 24px; }

    .hero h1 { font-size: 32px; }
    .hero-buttons .btn { padding: 12px 28px; font-size: 14px; }
}

/* ========== 无障碍 ========== */
.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0;
    margin: -1px; overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}
:focus-visible {
    outline: 2px solid #70b52c;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ========== 打印优化 ========== */
@media print {
    .navbar, .search-overlay, .mobile-drawer, .mobile-backdrop, .scroll-indicator { display: none; }
    .hero { min-height: auto; padding: 40px 20px; }
}

/* ========== 移动端右侧抽屉导航 ========== */
.mobile-backdrop {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.45);
    backdrop-filter: blur(2px);
    opacity: 0; visibility: hidden;
    transition: opacity .35s ease, visibility .35s ease;
    z-index: 999;
}
.mobile-backdrop.active {
    opacity: 1; visibility: visible;
}

.mobile-drawer {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: min(320px, 85vw);
    background: #fff;
    box-shadow: -12px 0 40px rgba(0,0,0,0.15);
    z-index: 1000;
    display: flex; flex-direction: column;
    transform: translateX(100%);
    transition: transform .35s cubic-bezier(.4,0,.2,1);
    visibility: hidden;
}
.mobile-drawer.active {
    transform: translateX(0);
    visibility: visible;
}
.mobile-drawer-head {
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid #f0f0f0;
    flex-shrink: 0;
}
.mobile-drawer-title {
    font-size: 17px; font-weight: 700; color: #1f2a37;
}
.mobile-drawer-close {
    width: 36px; height: 36px; border-radius: 50%;
    background: #f5f7fa; border: none; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 15px; color: #5a6577;
    transition: background .25s ease, color .25s ease, transform .25s ease;
}
.mobile-drawer-close:hover { background: #eef4fb; color: #70b52c; transform: rotate(90deg); }

.mobile-drawer-body {
    flex: 1; overflow-y: auto;
    padding: 8px 0;
    -webkit-overflow-scrolling: touch;
}

/* 抽屉里的菜单项 */
.mobile-item {
    display: flex; align-items: center; gap: 12px;
    padding: 15px 24px;
    font-size: 15px; font-weight: 500;
    color: #3a4355; text-decoration: none;
    transition: background .25s ease, color .25s ease;
    border-left: 3px solid transparent;
}
.mobile-item i:first-child { color: #70b52c; font-size: 16px; width: 20px; text-align: center; }
.mobile-item:hover { background: #f7faf4; color: #1f2a37; }
.mobile-item.is-current {
    background: #f3faf0; color: #5a8f22;
    border-left-color: #70b52c;
    font-weight: 600;
}
.mobile-item.is-current i:first-child { color: #5a8f22; }

.mobile-arrow {
    margin-left: auto;
    font-size: 12px; color: #c8ccd4;
    transition: transform .3s ease;
}
.mobile-group.open > .mobile-item .mobile-arrow { transform: rotate(90deg); color: #70b52c; }

.mobile-sub {
    max-height: 0; overflow: hidden;
    transition: max-height .35s ease;
}
.mobile-group.open > .mobile-sub { max-height: 600px; }

.mobile-sub-item {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 24px 12px 54px;
    font-size: 14px; color: #5a6577;
    text-decoration: none;
    transition: background .25s ease, color .25s ease;
}
.mobile-sub-item i { font-size: 10px; color: #c8ccd4; }
.mobile-sub-item:hover { background: #f7faf4; color: #3a4355; }
.mobile-sub-item.is-current { color: #70b52c; background: #f3faf0; font-weight: 500; }

.mobile-drawer-foot {
    padding: 16px 24px 28px;
    border-top: 1px solid #f0f0f0;
    flex-shrink: 0;
}
.mobile-drawer-foot a {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 18px;
    background: linear-gradient(135deg, #70b52c, #9ccc5e);
    color: #fff; text-decoration: none;
    border-radius: 10px;
    font-size: 14px; font-weight: 500;
    justify-content: center;
    transition: transform .25s ease, box-shadow .25s ease;
}
.mobile-drawer-foot a:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(112,181,44,.35); }

/* 防止 body 滚动 */
body.drawer-open { overflow: hidden; }

/* 禁止旧的 nav-menu.mobile-active 全屏样式在抽屉模式生效 */
@media (max-width: 768px) {
    .nav-menu.mobile-active { display: none !important; }
}

/* =========================================================
   全局滚动揭示动画（Scroll Reveal）
   使用：给目标元素加 class="reveal reveal-up"
   JS 通过 IntersectionObserver 自动加 .in 触发
   ========================================================= */
.reveal {
    opacity: 0;
    will-change: transform, opacity;
    transition: opacity .7s ease, transform .8s cubic-bezier(.22,1,.36,1);
}
.reveal-up    { transform: translateY(32px); }
.reveal-down  { transform: translateY(-32px); }
.reveal-left  { transform: translateX(-40px); }
.reveal-right { transform: translateX(40px); }
.reveal-scale { transform: scale(.92); }
.reveal.in {
    opacity: 1;
    transform: none;
}

/* 交错延迟：给同级子元素加 .reveal 的元素依次 80ms 延迟 */
.reveal-group .reveal:nth-child(1)  { transition-delay: 0ms; }
.reveal-group .reveal:nth-child(2)  { transition-delay: 80ms; }
.reveal-group .reveal:nth-child(3)  { transition-delay: 160ms; }
.reveal-group .reveal:nth-child(4)  { transition-delay: 240ms; }
.reveal-group .reveal:nth-child(5)  { transition-delay: 320ms; }
.reveal-group .reveal:nth-child(6)  { transition-delay: 400ms; }
.reveal-group .reveal:nth-child(7)  { transition-delay: 480ms; }
.reveal-group .reveal:nth-child(8)  { transition-delay: 560ms; }
.reveal-group .reveal:nth-child(9)  { transition-delay: 640ms; }
.reveal-group .reveal:nth-child(10) { transition-delay: 720ms; }

/* 图片懒加载占位（防布局抖动） */
img[data-lazy] {
    background: #f0f2f5;
    transition: opacity .5s ease, filter .5s ease;
    opacity: 0;
    filter: blur(6px);
}
img[data-lazy].lazy-loaded {
    opacity: 1;
    filter: none;
    background: transparent;
}

/* 滚动进度条（顶部细线） */
.scroll-progress {
    position: fixed;
    top: 0; left: 0;
    height: 2px;
    background: linear-gradient(90deg, #70b52c, #9ccc5e);
    z-index: 9999;
    width: 0;
    transition: width .1s ease-out;
    pointer-events: none;
}

/* 回到顶部按钮 */
.back-top {
    position: fixed;
    bottom: 32px;
    right: 28px;
    width: 44px; height: 44px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    display: flex; align-items: center; justify-content: center;
    color: #70b52c;
    font-size: 16px;
    text-decoration: none;
    opacity: 0; visibility: hidden;
    transform: translateY(12px);
    transition: all .35s ease;
    z-index: 998;
}
.back-top.show {
    opacity: 1; visibility: visible;
    transform: translateY(0);
}
.back-top:hover {
    background: #70b52c; color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(112,181,44,.4);
}

/* ========== 核心技术 Section ========== */
.tech {
    position: relative;
    padding: 100px 0;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: #fff;
    overflow: hidden;
}
.tech-mask {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(10,25,45,.92) 0%, rgba(10,25,45,.78) 45%, rgba(10,25,45,.55) 100%);
    z-index: 1;
}
.tech-inner {
    position: relative;
    z-index: 2;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    align-items: center;
}
/* 左侧文字 */
.tech-left {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
}
.tech-en {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--accent);
    margin-bottom: 18px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
}
.tech-title {
    font-size: 34px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 24px;
    color: #fff;
}
.tech-desc {
    font-size: 15px;
    line-height: 1.9;
    color: rgba(255,255,255,.85);
    margin-bottom: 32px;
}
.tech-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    background: var(--accent);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    transition: all .3s ease;
}
.tech-cta:hover {
    background: #1d9573;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(37,176,135,.35);
}
.tech-cta i { transition: transform .3s ease; }
.tech-cta:hover i { transform: translateX(4px); }

/* 右侧五图 */
.tech-right {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
}
.tech-step {
    background: rgba(255,255,255,.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 16px;
    overflow: hidden;
    transition: all .35s ease;
}
.tech-step:hover {
    transform: translateY(-6px);
    background: rgba(255,255,255,.14);
    border-color: rgba(37,176,135,.5);
    box-shadow: 0 16px 40px rgba(0,0,0,.35);
}
.tech-step-img {
    height: 150px;
    background-size: cover;
    background-position: center;
}
.tech-step-body { padding: 18px 18px 22px; }
.tech-step-num {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 2px;
    margin-bottom: 8px;
}
.tech-step-title {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}
.tech-step-desc {
    font-size: 13px;
    line-height: 1.6;
    color: rgba(255,255,255,.75);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .tech { padding: 72px 0; }
    .tech-inner { grid-template-columns: 1fr; gap: 48px; }
    .tech-left { max-width: none; text-align: center; }
    .tech-title { font-size: 28px; }
    .tech-right { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    .tech { padding: 56px 0; }
    .tech-title { font-size: 24px; }
    .tech-right { grid-template-columns: 1fr; gap: 14px; }
    .tech-step-img { height: 180px; }
}
@media (max-width: 480px) {
    .tech-inner { gap: 32px; }
    .tech-title { font-size: 22px; }
}