/* ========================================
   北京荣瑞世纪科技有限公司 - 主页样式
   主题色: #0656ad  辅色: #e9e5e3
   ======================================== */

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

:root {
    --primary: #0656ad;
    --primary-dark: #043d7a;
    --primary-light: #0a6fd4;
    --secondary: #e9e5e3;
    --secondary-light: #f5f3f1;
    --dark: #1a2744;
    --dark-footer: #0f1a2e;
    --text: #333333;
    --text-light: #666666;
    --white: #ffffff;
    --border: #e0e0e0;
    --shadow: rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    background: var(--white);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul, ol {
    list-style: none;
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === Top Bar === */
.rongrui-topbar {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
    height: 36px;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1001;
}

.rongrui-topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.rongrui-topbar-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.rongrui-topbar-left span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.rongrui-topbar-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Language Dropdown */
.rongrui-lang-switch {
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition);
}

.rongrui-lang-switch:hover {
    background: rgba(255, 255, 255, 0.1);
}

.rongrui-lang-switch .rongrui-lang-icon {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.rongrui-lang-switch .rongrui-lang-icon::before {
    content: "🌐";
    font-size: 14px;
}

.rongrui-lang-switch .rongrui-lang-arrow {
    font-size: 10px;
    transition: transform 0.3s ease;
}

.rongrui-lang-switch.active .rongrui-lang-arrow {
    transform: rotate(180deg);
}

.rongrui-lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border-radius: 6px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 1002;
    overflow: hidden;
}

.rongrui-lang-switch.active .rongrui-lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(4px);
}

.rongrui-lang-dropdown a {
    display: block;
    padding: 10px 16px;
    color: var(--text);
    font-size: 13px;
    transition: var(--transition);
}

.rongrui-lang-dropdown a:hover,
.rongrui-lang-dropdown a.active {
    background: var(--secondary);
    color: var(--primary);
}

/* === Navigation === */
.rongrui-navbar {
    background: var(--white);
    height: 72px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px var(--shadow);
    transition: var(--transition);
}

.rongrui-navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.12);
}

.rongrui-navbar .container {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    width: 100%;
    gap: 20px;
}

.rongrui-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.rongrui-logo img {
    height: 42px;
    width: auto;
}

.rongrui-logo-text {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
}

.rongrui-nav-menu {
    display: flex;
    align-items: center;
    gap: 0;
    margin: 0 auto;
    flex: 1;
    justify-content: center;
}

.rongrui-nav-item {
    position: relative;
}

.rongrui-nav-item > a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 24px 35px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text);
    transition: var(--transition);
    white-space: nowrap;
}

/* Search Icon in Navbar */
.rongrui-nav-search {
    margin-left: 30px;
    position: relative;
}

.rongrui-nav-search-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text);
    font-size: 18px;
}

.rongrui-nav-search-icon:hover {
    background: var(--secondary);
    color: var(--primary);
}

/* Search Popup */
.rongrui-search-popup {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.rongrui-search-popup.active {
    display: flex !important;
    opacity: 1;
    visibility: visible;
}

.rongrui-search-popup-content {
    background: var(--white);
    padding: 50px;
    border-radius: 16px;
    width: 90%;
    max-width: 700px;
    position: relative;
    transform: translateY(-30px);
    transition: transform 0.3s ease;
}

.rongrui-search-popup.active .rongrui-search-popup-content {
    transform: translateY(0);
}

.rongrui-search-popup-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    color: var(--text-light);
    transition: var(--transition);
    background: none;
    border: none;
}

.rongrui-search-popup-close:hover {
    background: var(--secondary);
    color: var(--primary);
}

.rongrui-search-popup-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 30px;
    text-align: center;
}

.rongrui-search-popup-form {
    display: flex;
    gap: 15px;
}

.rongrui-search-popup-input {
    flex: 1;
    padding: 18px 25px;
    border: 2px solid var(--border);
    border-radius: 50px;
    font-size: 16px;
    outline: none;
    transition: var(--transition);
}

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

.rongrui-search-popup-btn {
    padding: 18px 40px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.rongrui-search-popup-btn:hover {
    background: var(--primary-dark);
}

.rongrui-nav-item > a:hover,
.rongrui-nav-item.active > a {
    color: var(--primary);
}

.rongrui-nav-item > a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 20px;
    right: 20px;
    height: 3px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.rongrui-nav-item > a:hover::after,
.rongrui-nav-item.active > a::after {
    transform: scaleX(1);
}

/* Dropdown arrow */
.rongrui-nav-item .rongrui-nav-arrow {
    font-size: 10px;
    transition: transform 0.3s ease;
}

.rongrui-nav-item:hover .rongrui-nav-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.rongrui-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    background: var(--white);
    min-width: 180px;
    width: max-content;
    border-radius: 0 0 8px 8px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(10px);
    transition: var(--transition);
    z-index: 999;
    overflow: hidden;
}

.rongrui-nav-item:hover .rongrui-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.rongrui-dropdown-menu a {
    display: block;
    padding: 12px 20px;
    font-size: 14px;
    color: var(--text);
    transition: var(--transition);
    border-bottom: 1px solid var(--secondary);
}

.rongrui-dropdown-menu a:last-child {
    border-bottom: none;
}

.rongrui-dropdown-menu a:hover {
    background: var(--secondary-light);
    color: var(--primary);
    padding-left: 24px;
}

/* Mega Menu - 四级导航 */
.rongrui-nav-megamenu {
    position: relative;
}

.rongrui-megamenu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    display: flex;
    min-width: 800px;
    overflow: hidden;
}

.rongrui-nav-megamenu:hover .rongrui-megamenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* 二级：左侧分类 */
.rongrui-megamenu-level2 {
    width: 180px;
    background: #f8f9fa;
    padding: 20px 0;
    border-right: 1px solid var(--border);
}

.rongrui-megamenu-tab {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text);
    font-size: 15px;
    font-weight: 500;
}

.rongrui-megamenu-tab:hover,
.rongrui-megamenu-tab.active {
    background: var(--primary);
    color: var(--white);
}

.rongrui-megamenu-tab i {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

/* 三级：中间分类 */
.rongrui-megamenu-level3 {
    width: 220px;
    padding: 15px 0;
    border-right: 1px solid var(--border);
}

.rongrui-megamenu-panel {
    display: none;
}

.rongrui-megamenu-panel.active {
    display: block;
}

.rongrui-megamenu-category {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text);
    font-size: 14px;
    border-bottom: 1px solid var(--secondary);
}

.rongrui-megamenu-category:last-child {
    border-bottom: none;
}

.rongrui-megamenu-category:hover,
.rongrui-megamenu-category.active {
    background: var(--secondary-light);
    color: var(--primary);
}

.rongrui-megamenu-category i {
    font-size: 12px;
    color: var(--text-light);
    transition: var(--transition);
}

.rongrui-megamenu-category:hover i,
.rongrui-megamenu-category.active i {
    color: var(--primary);
    transform: translateX(3px);
}

/* 四级：右侧产品列表 */
.rongrui-megamenu-level4 {
    flex: 1;
    padding: 15px 0;
    min-width: 280px;
}

.rongrui-megamenu-products {
    display: none;
}

.rongrui-megamenu-products.active {
    display: block;
}

.rongrui-megamenu-products a {
    display: block;
    padding: 12px 25px;
    color: var(--text);
    font-size: 14px;
    transition: var(--transition);
    border-bottom: 1px solid var(--secondary);
}

.rongrui-megamenu-products a:last-child {
    border-bottom: none;
}

.rongrui-megamenu-products a:hover {
    color: var(--primary);
    background: var(--secondary-light);
    padding-left: 30px;
}

/* Mobile Menu Toggle */
.rongrui-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.rongrui-mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
    border-radius: 2px;
}

.rongrui-mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.rongrui-mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.rongrui-mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* === Hero Section === */
.rongrui-hero {
    position: relative;
    height: 600px;
    min-height: 500px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
}

.rongrui-hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
}

.rongrui-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(6, 86, 173, 0.85) 0%, rgba(10, 111, 212, 0.6) 100%);
}

.rongrui-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--white);
    max-width: 800px;
    padding: 0 20px;
}

.rongrui-hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.rongrui-hero-subtitle {
    font-size: 20px;
    font-weight: 300;
    line-height: 1.6;
    margin-bottom: 36px;
    opacity: 0.9;
}

.rongrui-hero-btn {
    display: inline-block;
    padding: 14px 40px;
    background: var(--white);
    color: var(--primary);
    font-size: 16px;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.rongrui-hero-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.3);
}

/* Decorative shapes */
.rongrui-hero-shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.rongrui-hero-shapes .rongrui-shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
}

.rongrui-hero-shapes .rongrui-shape:nth-child(1) {
    width: 400px;
    height: 400px;
    top: -100px;
    right: -100px;
}

.rongrui-hero-shapes .rongrui-shape:nth-child(2) {
    width: 300px;
    height: 300px;
    bottom: -80px;
    left: -80px;
}

.rongrui-hero-shapes .rongrui-shape:nth-child(3) {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 10%;
}

/* === Section Common === */
.rongrui-section {
    padding: 80px 0;
}

.rongrui-section-header {
    text-align: center;
    margin-bottom: 50px;
}

.rongrui-section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}

.rongrui-section-title::after {
    content: "";
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.rongrui-section-subtitle {
    font-size: 16px;
    color: var(--text-light);
    margin-top: 16px;
}

/* === Products Section === */
.rongrui-products {
    background: var(--white);
}

.rongrui-product-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.rongrui-product-tab {
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    background: var(--white);
}

.rongrui-product-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.rongrui-product-tab.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

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

.rongrui-product-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.rongrui-product-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.rongrui-product-card-img {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--secondary-light);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

.rongrui-product-card-info {
    padding: 16px;
    text-align: center;
}

.rongrui-product-card-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.rongrui-product-card-desc {
    font-size: 13px;
    color: var(--text-light);
}

.rongrui-product-more {
    text-align: center;
    margin-top: 40px;
}

.rongrui-product-more a {
    display: inline-block;
    padding: 12px 36px;
    border: 2px solid var(--primary);
    color: var(--primary);
    font-size: 15px;
    font-weight: 500;
    border-radius: 50px;
    transition: var(--transition);
}

.rongrui-product-more a:hover {
    background: var(--primary);
    color: var(--white);
}

/* === Solutions Section === */
.rongrui-solutions {
    background: var(--secondary-light);
}

.rongrui-solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.rongrui-solution-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px var(--shadow);
    transition: var(--transition);
}

.rongrui-solution-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.rongrui-solution-card-img {
    width: 100%;
    height: 240px;
    overflow: hidden;
}

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

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

.rongrui-solution-card-body {
    padding: 28px;
}

.rongrui-solution-card-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}

.rongrui-solution-card-text {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 16px;
}

.rongrui-solution-card-link {
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.rongrui-solution-card-link:hover {
    gap: 10px;
}

/* === News Section === */
.rongrui-news {
    background: var(--white);
}

.rongrui-news-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.rongrui-news-header-left .rongrui-section-title {
    margin-bottom: 0;
}

.rongrui-news-header-left .rongrui-section-title::after {
    display: none;
}

.rongrui-news-viewall {
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.rongrui-news-viewall:hover {
    gap: 8px;
}

.rongrui-news-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.rongrui-news-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.rongrui-news-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.rongrui-news-card-img {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

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

.rongrui-news-card-body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.rongrui-news-card-date {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.rongrui-news-card-tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--secondary);
    color: var(--primary);
    font-size: 12px;
    border-radius: 4px;
    margin-bottom: 10px;
    align-self: flex-start;
}

.rongrui-news-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.5;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.rongrui-news-card-excerpt {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* === About / Technology Section === */
.rongrui-about {
    background: var(--secondary);
}

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

.rongrui-about-text h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
    line-height: 1.3;
}

.rongrui-about-text p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 16px;
}

.rongrui-about-btn {
    display: inline-block;
    padding: 12px 32px;
    background: var(--primary);
    color: var(--white);
    font-size: 15px;
    font-weight: 500;
    border-radius: 50px;
    transition: var(--transition);
    margin-top: 8px;
}

.rongrui-about-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.rongrui-about-img {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.rongrui-about-img img {
    width: 100%;
    height: auto;
    display: block;
}

/* === Stats Section === */
.rongrui-stats {
    background: var(--primary);
    padding: 60px 0;
}

.rongrui-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
    color: var(--white);
}

.rongrui-stat-item .rongrui-stat-number {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 8px;
}

.rongrui-stat-item .rongrui-stat-label {
    font-size: 14px;
    opacity: 0.85;
}

/* === Contact Section === */
.rongrui-contact {
    background: var(--white);
}

.rongrui-contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.rongrui-contact-card {
    text-align: center;
    padding: 40px 24px;
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: var(--transition);
}

.rongrui-contact-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 20px rgba(6, 86, 173, 0.1);
    transform: translateY(-4px);
}

.rongrui-contact-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: var(--secondary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary);
}

.rongrui-contact-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 10px;
}

.rongrui-contact-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* === CTA Section === */
.rongrui-cta {
    background: linear-gradient(135deg, var(--dark) 0%, var(--primary-dark) 100%);
    padding: 80px 0;
    text-align: center;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.rongrui-cta::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
}

.rongrui-cta h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.rongrui-cta p {
    font-size: 16px;
    opacity: 0.85;
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
}

.rongrui-cta-btn {
    display: inline-block;
    padding: 14px 40px;
    border: 2px solid var(--white);
    color: var(--white);
    font-size: 16px;
    font-weight: 500;
    border-radius: 50px;
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

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

/* === Footer === */
.rongrui-footer {
    background: var(--dark-footer);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

.rongrui-footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.rongrui-footer-brand img {
    height: 40px;
    margin-bottom: 16px;
}

.rongrui-footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.rongrui-footer-social {
    display: flex;
    gap: 12px;
}

.rongrui-footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.rongrui-footer-social a:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

.rongrui-footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
}

.rongrui-footer-col ul li {
    margin-bottom: 10px;
}

.rongrui-footer-col ul li a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.rongrui-footer-col ul li a:hover {
    color: var(--white);
    padding-left: 4px;
}

.rongrui-footer-bottom {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
}

.rongrui-footer-bottom-links {
    display: flex;
    gap: 20px;
}

.rongrui-footer-bottom-links a:hover {
    color: var(--white);
}

/* === Back to Top === */
.rongrui-back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(6, 86, 173, 0.3);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
}

.rongrui-back-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.rongrui-back-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 1024px) {
    .rongrui-hero {
        height: 480px;
    }

    .rongrui-hero-title {
        font-size: 36px;
    }

    .rongrui-hero-subtitle {
        font-size: 17px;
    }

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

    .rongrui-footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }

    .rongrui-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .rongrui-about-grid {
        gap: 40px;
    }
}

/* Tablet Small */
@media (max-width: 768px) {
    .rongrui-topbar {
        display: none;
    }

    .rongrui-navbar {
        height: 64px;
    }

    .rongrui-mobile-toggle {
        display: flex;
    }

    .rongrui-nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 20px 0;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
        transform: translateX(100%);
        transition: transform 0.3s ease;
        z-index: 999;
        max-height: calc(100vh - 64px);
        overflow-y: auto;
    }

    .rongrui-nav-menu.active {
        transform: translateX(0);
    }

    .rongrui-nav-item > a {
        padding: 14px 24px;
        border-bottom: 1px solid var(--secondary);
        width: 100%;
        justify-content: space-between;
    }

    .rongrui-nav-item > a::after {
        display: none;
    }

    .rongrui-dropdown-menu {
        position: static;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
        background: var(--secondary-light);
        border-radius: 0;
    }

    .rongrui-nav-item.dropdown-open .rongrui-dropdown-menu {
        display: block;
    }

    .rongrui-dropdown-menu a {
        padding: 10px 36px;
        border-bottom-color: var(--border);
    }

    .rongrui-hero {
        height: 420px;
        min-height: 360px;
    }

    .rongrui-hero-title {
        font-size: 28px;
    }

    .rongrui-hero-subtitle {
        font-size: 15px;
        margin-bottom: 24px;
    }

    .rongrui-hero-btn {
        padding: 12px 32px;
        font-size: 14px;
    }

    .rongrui-section {
        padding: 60px 0;
    }

    .rongrui-section-title {
        font-size: 26px;
    }

    .rongrui-product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .rongrui-product-card-img {
        height: 160px;
    }

    .rongrui-solutions-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .rongrui-news-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .rongrui-about-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .rongrui-contact-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .rongrui-footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .rongrui-footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

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

    .rongrui-stat-item .rongrui-stat-number {
        font-size: 32px;
    }

    .rongrui-news-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .rongrui-hero {
        height: 360px;
        min-height: 300px;
    }

    .rongrui-hero-title {
        font-size: 24px;
    }

    .rongrui-hero-subtitle {
        font-size: 14px;
    }

    .rongrui-section {
        padding: 40px 0;
    }

    .rongrui-section-title {
        font-size: 22px;
    }

    .rongrui-product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .rongrui-product-tabs {
        gap: 6px;
    }

    .rongrui-product-tab {
        padding: 8px 16px;
        font-size: 13px;
    }

    .rongrui-product-card-img {
        height: 130px;
    }

    .rongrui-product-card-info {
        padding: 12px;
    }

    .rongrui-product-card-name {
        font-size: 13px;
    }

    .rongrui-solution-card-img {
        height: 180px;
    }

    .rongrui-news-card-img {
        height: 160px;
    }

    .rongrui-contact-card {
        padding: 28px 16px;
    }

    .rongrui-cta h2 {
        font-size: 24px;
    }

    .rongrui-cta p {
        font-size: 14px;
    }

    .rongrui-cta-btn {
        padding: 12px 32px;
        font-size: 14px;
    }
}

/* === Animations === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.rongrui-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.rongrui-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Utility */
.rongrui-text-center {
    text-align: center;
}

.rongrui-mt-20 {
    margin-top: 20px;
}

.rongrui-mb-20 {
    margin-bottom: 20px;
}