/* ==================== 基础样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #1890ff;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-white: #ffffff;
    --bg-gray: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.section-gray {
    background-color: var(--bg-gray);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-gray);
    margin-top: 24px;
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 32px;
    font-size: 16px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-outline:hover {
    background: #fff;
    color: var(--primary-color);
}

.btn-full {
    width: 100%;
}

/* ==================== 顶部导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: transparent;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    padding: 12px 0;
    backdrop-filter: blur(10px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 28px;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    transition: var(--transition);
}

.header.scrolled .logo-text {
    color: var(--text-dark);
}

.nav-list {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: #fff;
    position: relative;
    padding: 5px 0;
}

.header.scrolled .nav-link {
    color: var(--text-dark);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color) !important;
}

.header-contact {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #fff;
    font-weight: 600;
    font-size: 16px;
}

.header.scrolled .header-contact {
    color: var(--primary-color);
}

.header-contact i {
    font-size: 18px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: #fff;
    transition: var(--transition);
    border-radius: 2px;
}

.header.scrolled .mobile-menu-btn span {
    background: var(--text-dark);
}

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

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

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

/* ==================== Banner轮播区 ==================== */
.banner {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
}

.banner-slider {
    position: relative;
    width: 100%;
    height: 100%;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.banner-slide.active {
    opacity: 1;
    visibility: visible;
}

.banner-content {
    max-width: 700px;
    color: #fff;
    animation: fadeInUp 1s ease;
}

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

.banner-title {
    font-size: 52px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.banner-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.banner-btns {
    display: flex;
    gap: 20px;
}

.banner-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(5px);
}

.banner-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.banner-prev {
    left: 30px;
}

.banner-next {
    right: 30px;
}

.banner-dots {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: #fff;
    width: 30px;
    border-radius: 6px;
}

/* ==================== 关于我们 ==================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-slogan {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
    line-height: 1.4;
}

.about-desc {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 20px 10px;
    background: var(--bg-gray);
    border-radius: 12px;
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-number::after {
    content: '+';
    font-size: 24px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-gray);
}

.about-image {
    display: flex;
    justify-content: center;
}

.about-img-placeholder {
    width: 100%;
    max-width: 450px;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: var(--shadow-xl);
}

.about-img-placeholder i {
    font-size: 100px;
    margin-bottom: 20px;
    opacity: 0.9;
}

.about-img-placeholder p {
    font-size: 24px;
    font-weight: 600;
}

/* ==================== 服务项目 ==================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: #fff;
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(24, 144, 255, 0.1));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: var(--primary-color);
    transition: var(--transition);
}

.service-card:hover .service-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    transform: scale(1.1);
}

.service-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.service-desc {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 24px;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 15px;
}

.service-link i {
    font-size: 12px;
    transition: var(--transition);
}

.service-card:hover .service-link i {
    transform: translateX(5px);
}

/* ==================== 成功案例 ==================== */
.case-filter {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 28px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-gray);
    background: #fff;
    border: 2px solid var(--border-color);
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    color: #fff;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: transparent;
}

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

.case-card {
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.case-image {
    width: 100%;
    aspect-ratio: 16/10;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 60px;
    transition: var(--transition);
}

.case-card:hover .case-image {
    transform: scale(1.05);
}

.case-info {
    padding: 24px;
}

.case-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.case-client {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 16px;
}

.case-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.case-tag {
    padding: 4px 12px;
    font-size: 12px;
    color: var(--primary-color);
    background: rgba(37, 99, 235, 0.1);
    border-radius: 20px;
}

.case-card.hide {
    display: none;
}

/* ==================== 新闻资讯 ==================== */
.news-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.news-featured-card {
    background: #fff;
    border-radius: 16px;
    overflow: hidden;
    height: 100%;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.news-featured-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.news-featured-image {
    width: 100%;
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 80px;
}

.news-featured-info {
    padding: 30px;
}

.news-category {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    margin-bottom: 16px;
}

.news-featured-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.4;
}

.news-featured-desc {
    font-size: 15px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    gap: 20px;
    font-size: 14px;
    color: var(--text-light);
}

.news-meta i {
    margin-right: 5px;
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.news-item {
    display: flex;
    gap: 20px;
    padding: 20px;
    background: #fff;
    border-radius: 12px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.news-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.news-item-image {
    width: 120px;
    height: 90px;
    flex-shrink: 0;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 32px;
}

.news-item-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.news-item-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.5;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-item:hover .news-item-title {
    color: var(--primary-color);
}

/* ==================== 联系我们 ==================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info-title,
.contact-form-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 30px;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    flex-shrink: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(24, 144, 255, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary-color);
}

.contact-text h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.contact-text p {
    font-size: 15px;
    color: var(--text-gray);
}

.contact-form-wrapper {
    background: #fff;
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    font-size: 15px;
    color: var(--text-dark);
    background: var(--bg-gray);
    border: 2px solid transparent;
    border-radius: 8px;
    outline: none;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    background: #fff;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    padding: 16px 32px;
    font-size: 16px;
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--bg-dark);
    color: #d1d5db;
    padding-top: 70px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr 1fr;
    gap: 50px;
    padding-bottom: 50px;
    border-bottom: 1px solid #374151;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.footer-logo-icon {
    font-size: 28px;
    color: var(--primary-light);
}

.footer-logo-text {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    color: #9ca3af;
    margin-bottom: 24px;
}

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

.social-link {
    width: 40px;
    height: 40px;
    background: #374151;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #d1d5db;
    font-size: 16px;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary-color);
    color: #fff;
    transform: translateY(-3px);
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 24px;
}

.footer-link-list li {
    margin-bottom: 12px;
}

.footer-link-list a {
    font-size: 14px;
    color: #9ca3af;
    transition: var(--transition);
}

.footer-link-list a:hover {
    color: var(--primary-light);
    padding-left: 5px;
}

.footer-contact-list li {
    font-size: 14px;
    color: #9ca3af;
    margin-bottom: 16px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.footer-contact-list i {
    color: var(--primary-light);
    margin-top: 3px;
    font-size: 14px;
}

.qrcode-box {
    text-align: center;
}

.qrcode-placeholder {
    width: 120px;
    height: 120px;
    background: #fff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    color: var(--bg-dark);
    font-size: 50px;
}

.qrcode-box p {
    font-size: 13px;
    color: #9ca3af;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
}

.footer-links-row {
    margin-bottom: 16px;
    font-size: 14px;
}

.friend-link-title {
    color: #9ca3af;
    margin-right: 10px;
}

.footer-links-row a {
    color: #6b7280;
    margin: 0 8px;
    font-size: 13px;
}

.footer-links-row a:hover {
    color: var(--primary-light);
}

.copyright p {
    font-size: 13px;
    color: #6b7280;
}

/* ==================== 回到顶部 ==================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.4);
}

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

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

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

@media (max-width: 768px) {
    .section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: #fff;
        padding: 80px 30px 30px;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
        transition: right 0.4s ease;
        z-index: -1;
    }

    .nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        gap: 20px;
    }

    .nav-link {
        color: var(--text-dark) !important;
        font-size: 16px;
    }

    .mobile-menu-btn {
        display: flex;
        z-index: 1001;
    }

    .header-contact {
        display: none;
    }

    .banner {
        height: auto;
        min-height: 500px;
        padding: 120px 0 80px;
    }

    .banner-title {
        font-size: 32px;
    }

    .banner-subtitle {
        font-size: 16px;
    }

    .banner-btns {
        flex-direction: column;
        gap: 12px;
    }

    .banner-btn {
        width: 40px;
        height: 40px;
        font-size: 14px;
    }

    .banner-prev {
        left: 10px;
    }

    .banner-next {
        right: 10px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

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

    .case-filter {
        gap: 8px;
    }

    .filter-btn {
        padding: 8px 16px;
        font-size: 14px;
    }

    .news-content {
        grid-template-columns: 1fr;
    }

    .news-featured-title {
        font-size: 18px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-form-wrapper {
        padding: 30px 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-bottom {
        padding: 20px 0;
    }

    .footer-links-row a {
        display: inline-block;
        margin: 4px 6px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 24px;
    }

    .banner-title {
        font-size: 26px;
    }

    .about-slogan {
        font-size: 22px;
    }

    .stat-number {
        font-size: 26px;
    }

    .news-item {
        flex-direction: column;
    }

    .news-item-image {
        width: 100%;
        height: 180px;
    }
}