/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #cc0000;
    --primary-hover: #a30000;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --bg-light: #f8f9fa;
    --bg-dark: #0a0a0a;
    --border-color: #e0e0e0;
    --white: #ffffff;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
    padding-top: 70px; /* 为固定导航栏留出空间 */
    background-color: #ffffff; /* 整体背景白色 */
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 180px;
}

/* 导航栏样式 */
.navbar {
    background: var(--white);
    box-shadow: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1000;
    padding: 0;
    border-bottom: 1px solid rgba(0,0,0,0.08);
    overflow: visible;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    padding: 0 180px;
    position: relative;
    overflow: visible;
}

.navbar-brand {
    display: flex;
    align-items: center;
}

.navbar-brand a {
    text-decoration: none;
    display: flex;
    align-items: center;
}

/* 导航栏 logo 图片 */
.navbar-logo {
    height: 40px;
    width: auto;
    display: block;
}

.navbar-links {
    display: flex;
    gap: 0;
    height: 100%;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

.navbar-links .nav-item {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
    list-style: none;
}

.navbar-links .nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 15px;
    position: relative;
    cursor: pointer;
}

.navbar-links .nav-link:hover {
    color: var(--primary-color);
    background: rgba(0,0,0,0.02);
}

.navbar-links .nav-link.active {
    color: var(--primary-color);
}

.navbar-links .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20px;
    right: 20px;
    height: 3px;
    background: var(--primary-color);
}

.nav-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    background: transparent;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.nav-arrow svg {
    width: 10px;
    height: 10px;
    fill: var(--text-dark);
    transition: all 0.3s ease;
}

.nav-item:hover .nav-arrow {
    transform: rotate(180deg);
    background: #ffff00;
}

.nav-item:hover .nav-arrow svg {
    fill: var(--text-dark);
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: var(--white);
    min-width: 800px;
    max-width: 1000px;
    padding: 30px 35px;
    box-shadow: 0 10px 50px rgba(0,0,0,0.15);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    border-radius: 15px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    z-index: 100;
    pointer-events: none;
    margin-top: 0;
}

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

.dropdown-column {
    min-width: 0;
}

.dropdown-column h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 15px;
    margin-top: 0;
    text-transform: none;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--bg-light);
}

.dropdown-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.dropdown-column ul li {
    margin-bottom: 8px;
}

.dropdown-column ul li:last-child {
    margin-bottom: 0;
}

.dropdown-column ul li a {
    text-decoration: none;
    color: var(--text-light);
    font-size: 14px;
    transition: var(--transition);
    display: block;
    padding: 6px 0;
    line-height: 1.5;
}

.dropdown-column ul li a:hover {
    color: var(--primary-color);
    padding-left: 8px;
    background: transparent;
}

.dropdown-highlight {
    background: var(--bg-light);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

.dropdown-highlight img {
    max-width: 100%;
    margin-bottom: 10px;
}

.dropdown-highlight .highlight-text {
    font-size: 13px;
    color: var(--text-dark);
    font-weight: 500;
    margin-bottom: 10px;
}

.dropdown-highlight .btn-highlight {
    display: inline-block;
    padding: 8px 20px;
    background: #ffd700;
    color: var(--text-dark);
    border-radius: 20px;
    text-decoration: none;
    font-size: 12px;
    font-weight: 600;
    transition: var(--transition);
}

.dropdown-highlight .btn-highlight:hover {
    background: #ffed4e;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.lang-selector {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 5px;
    transition: var(--transition);
    user-select: none;
}

.lang-selector:hover {
    background: var(--bg-light);
}

.lang-selector svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.lang-selector span {
    font-size: 14px;
    color: var(--text-dark);
    font-weight: 500;
}

/* 语言选择器箭头悬停旋转效果 */
.lang-selector:hover .nav-arrow {
    transform: rotate(180deg);
}

.btn-login {
    padding: 8px 20px;
    border: none;
    background: transparent;
    color: var(--primary-color);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    font-size: 14px;
    white-space: nowrap;
    text-decoration: none;
    display: inline-block;
}

.btn-login:hover {
    opacity: 0.7;
}

.btn-register {
    padding: 12px 32px;
    border: none;
    background: #ffff00;
    color: var(--text-dark);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    font-size: 14px;
    white-space: nowrap;
    text-decoration: none;
    display: inline-block;
}

.btn-register:hover {
    background: #ffed4e;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 255, 0, 0.4);
}

/* 移动端汉堡菜单 - 桌面隐藏 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 22px;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero区域 */
.hero-section {
    position: relative;
    height: 600px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

/* 视频背景容器 */
.hero-section .video-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-section .video-background video {
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    object-fit: cover;
}

.hero-section .video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,154.7C960,171,1056,181,1152,165.3C1248,149,1344,107,1392,85.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
    opacity: 0.3;
    animation: wave 10s ease-in-out infinite;
}

.particle-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 10px;
    height: 10px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: var(--white);
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.btn-primary {
    padding: 1rem 2.5rem;
    border: none;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(204, 0, 0, 0.3);
}

/* 横幅区域 */
.banner-section {
    padding: 4rem 0;
    background: var(--bg-light);
}

.manutd-banner {
    background: linear-gradient(135deg, #1a1a1a 0%, #333333 100%);
    color: var(--white);
    text-align: center;
}

.promotion-banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, #ff4444 100%);
    color: var(--white);
    text-align: center;
}

.banner-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.banner-content p {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.btn-outline {
    padding: 0.8rem 2rem;
    border: 2px solid var(--white);
    background: transparent;
    color: var(--white);
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

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

/* 促销卡片区域 */
.promo-cards-section {
    padding: 0;
    background: transparent; /* 透明背景，让视频区域可见 */
    margin-top: -80px; /* 向下移动，使卡片中心与视频底部对齐 */
    position: relative;
    z-index: 10;
    padding-bottom: 80px; /* 底部留出间距 */
}

.promo-cards-wrapper {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 1600px; /* 进一步增加最大宽度 */
    margin: 0 auto;
    padding: 0 20px; /* 进一步减少两侧内边距，让卡片更宽 */
}

.promo-card {
    background: var(--white);
    border-radius: 20px;
    padding: 35px 45px; /* 优化内边距，给内容更多空间 */
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px; /* 增加内容和图片之间的间距 */
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    min-height: 200px; /* 增加最小高度 */
}

.promo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.promo-card-content {
    flex: 1;
    min-width: 300px; /* 设置最小宽度，确保文字有足够空间 */
}

.promo-card-content h3 {
    font-size: 22px; /* 恢复字体大小 */
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
    margin-top: 0;
    line-height: 1.3;
    white-space: nowrap; /* 防止标题换行 */
}

.promo-card-content p {
    font-size: 15px; /* 恢复字体大小 */
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 18px;
}

.promo-card-image {
    flex-shrink: 0;
    width: 220px; /* 增加图片宽度 */
    height: 160px; /* 增加图片高度 */
    overflow: hidden;
    border-radius: 12px;
}

.promo-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.btn-learn-more,
.btn-join-now {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--text-dark);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 20px;
    white-space: nowrap; /* 防止按钮文字换行 */
}

.btn-learn-more:hover,
.btn-join-now:hover {
    background: var(--bg-light);
}

.btn-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: #ffff00;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.btn-arrow svg {
    width: 12px;
    height: 12px;
    fill: var(--text-dark);
}

.btn-learn-more:hover .btn-arrow,
.btn-join-now:hover .btn-arrow {
    transform: rotate(180deg);
}

/* 产品区域 */
.products-section {
    padding: 5rem 0;
    background: var(--white);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--text-light);
    margin-bottom: 3rem;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.product-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: var(--transition);
}

/* 卡片悬停效果 - 原网站效果 */
.card-hover {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.product-image {
    height: 200px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

/* 懒加载图片 */
.lazy-image {
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.lazy-image.loaded {
    opacity: 1;
}

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-info {
    padding: 2rem;
}

.product-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.product-info p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.btn-text {
    background: none;
    border: none;
    color: var(--primary-color);
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.btn-text:hover {
    color: var(--primary-hover);
}

/* 数据统计 */
.stats-section {
    padding: 4rem 0;
    background: var(--bg-light);
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(204, 0, 0, 0.05) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    text-align: center;
}

.stat-item {
    padding: 2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.2rem;
    color: var(--text-light);
}

/* 资金安全 */
.security-section {
    padding: 5rem 0;
    background: var(--white);
}

.security-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 3rem;
}

.security-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.security-text p {
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.8;
}

.security-image img {
    width: 100%;
    border-radius: 10px;
}

.payment-platforms {
    text-align: center;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 10px;
}

.payment-platforms img {
    max-width: 100%;
    height: auto;
}

/* 荣誉奖项 */
.awards-section {
    padding: 5rem 0;
    background: var(--bg-light);
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.award-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.award-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.award-item img {
    max-width: 100px;
    height: auto;
    margin-bottom: 1rem;
}

.award-item p {
    color: var(--text-dark);
    font-weight: 500;
}

.awards-cta {
    text-align: center;
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #cccccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-icon {
    padding: 0.5rem 1rem;
    background: rgba(255,255,255,0.1);
    border-radius: 5px;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.social-icon:hover {
    background: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #cccccc;
}

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

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        padding: 0 60px;
    }
    .navbar .container {
        padding: 0 60px;
    }
    .promo-cards-wrapper {
        padding: 0 40px;
    }
}

@media (max-width: 992px) {
    .container {
        padding: 0 30px;
    }
    .navbar .container {
        padding: 0 30px;
    }
    .promo-cards-wrapper {
        grid-template-columns: 1fr;
        padding: 0 30px;
    }
    .promo-card {
        padding: 25px 30px;
    }
    .security-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    body {
        padding-top: 60px;
    }

    .container {
        padding: 0 16px;
    }

    .navbar .container {
        padding: 0 16px;
        height: 60px;
    }

    .navbar-links {
        display: none;
    }

    .lang-selector {
        display: none;
    }

    .btn-login {
        display: none;
    }

    .navbar-logo {
        height: 32px;
    }

    /* 移动端汉堡菜单按钮 */
    .mobile-menu-btn {
        display: flex;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
        padding: 8px;
        margin-left: 10px;
    }

    .mobile-menu-btn span {
        width: 22px;
        height: 2px;
        background: var(--text-dark);
        border-radius: 2px;
        transition: var(--transition);
    }

    /* Hero 区域手机适配 */
    .hero-section {
        height: 450px;
    }

    .hero-content h1 {
        font-size: 1.8rem;
        padding: 0 10px;
    }

    .hero-content p {
        font-size: 1rem;
        padding: 0 10px;
    }

    /* 促销卡片手机适配 */
    .promo-cards-section {
        margin-top: -40px;
        padding-bottom: 40px;
    }

    .promo-cards-wrapper {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 0 16px;
    }

    .promo-card {
        padding: 20px;
        min-height: auto;
        flex-direction: column;
        text-align: center;
    }

    .promo-card-content {
        min-width: auto;
    }

    .promo-card-content h3 {
        font-size: 1.1rem;
        white-space: normal;
    }

    .promo-card-content p {
        font-size: 0.9rem;
    }

    .promo-card-image {
        width: 100%;
        height: 120px;
    }

    /* 产品区域 */
    .products-section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .section-subtitle {
        font-size: 0.95rem;
        margin-bottom: 2rem;
    }

    .product-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .product-info {
        padding: 1.5rem;
    }

    .product-info h3 {
        font-size: 1.2rem;
    }

    /* 统计数据 */
    .stats-section {
        padding: 3rem 0;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .stat-item {
        padding: 1rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .stat-label {
        font-size: 0.9rem;
    }

    /* 资金安全 */
    .security-section {
        padding: 3rem 0;
    }

    .security-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .security-text h2 {
        font-size: 1.8rem;
    }

    /* 荣誉奖项 */
    .awards-section {
        padding: 3rem 0;
    }

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

    .award-item {
        padding: 1.2rem;
    }

    .award-item img {
        max-width: 60px;
    }

    .award-item p {
        font-size: 0.85rem;
    }

    /* 页脚 */
    .footer {
        padding: 2rem 0 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
    }

    .footer-section h3, .footer-section h4 {
        font-size: 0.95rem;
    }

    .footer-section ul li a, .footer-section p {
        font-size: 0.85rem;
    }

    .social-links {
        flex-wrap: wrap;
    }

    /* 按钮适配 */
    .btn-primary {
        padding: 0.8rem 1.8rem;
        font-size: 0.95rem;
    }

    .btn-register {
        padding: 10px 20px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .hero-section {
        height: 380px;
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

    .hero-content p {
        font-size: 0.9rem;
    }

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

    .stat-number {
        font-size: 1.6rem;
    }

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

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

    .btn-primary {
        padding: 0.7rem 1.5rem;
        font-size: 0.9rem;
    }
}