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

:root {
    --primary-color: #e63946;
    --secondary-color: #457b9d;
    --accent-color: #f4a261;
    --dark-color: #1d3557;
    --light-color: #f1faee;
    --text-color: #333;
    --gray-light: #f8f9fa;
    --gray-medium: #6c757d;
    --gray-dark: #495057;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 5px 20px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', '微软雅黑', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
}

html {
    scroll-behavior: smooth;
}

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

section {
    padding: 80px 0;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: white;
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.nav-brand a {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-brand a:hover {
    color: var(--dark-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: all 0.3s ease;
}

/* Hero 区域 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--dark-color) 0%, var(--secondary-color) 100%);
    color: white;
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://images.unsplash.com/photo-1555939594-58d7cb561ad1?w=1920') center/cover;
    opacity: 0.2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(29, 53, 87, 0.9) 0%, rgba(69, 123, 157, 0.9) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 20px;
    animation: fadeInUp 1s ease;
}

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

.hero-title {
    font-size: 4em;
    font-weight: bold;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 2em;
    margin-bottom: 15px;
    font-weight: 500;
}

.hero-desc {
    font-size: 1.2em;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 16px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(230, 57, 70, 0.4);
}

.btn-primary:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(230, 57, 70, 0.6);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

/* 产品中心 */
.products {
    background: white;
}

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

.section-header h2 {
    font-size: 2.5em;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.section-header p {
    font-size: 1.2em;
    color: var(--gray-medium);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.product-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.product-image {
    height: 250px;
    background: var(--gray-light);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-placeholder {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--gray-medium);
    text-align: center;
}

.product-info {
    padding: 25px;
}

.product-info h3 {
    font-size: 1.5em;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.product-desc {
    color: var(--gray-medium);
    margin-bottom: 15px;
    line-height: 1.8;
}

.product-features {
    list-style: none;
}

.product-features li {
    padding: 8px 0;
    color: var(--gray-dark);
    border-bottom: 1px solid var(--gray-light);
}

.product-features li:last-child {
    border-bottom: none;
}

/* 产品图片真实显示 */
.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

/* 热销徽章 */
.product-card {
    position: relative;
}

.product-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: linear-gradient(135deg, #e63946, #c1121f);
    color: white;
    font-size: 0.78em;
    font-weight: bold;
    padding: 4px 12px;
    border-radius: 20px;
    z-index: 2;
    box-shadow: 0 2px 8px rgba(230,57,70,0.4);
}

.product-card.hot {
    border: 2px solid rgba(230,57,70,0.2);
}

/* 产品价格 */
.product-price {
    font-size: 1.4em;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 8px;
}

/* 品类筛选按钮 */
.product-filter {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 36px;
    justify-content: center;
}

.filter-btn {
    padding: 8px 22px;
    border: 2px solid var(--secondary-color);
    background: transparent;
    color: var(--secondary-color);
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.95em;
    transition: all 0.25s ease;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--secondary-color);
    color: white;
}

/* 小按钮 */
.btn-sm {
    padding: 8px 18px;
    font-size: 0.9em;
    margin-top: 14px;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* 更多产品 · 一站式集采卡片 */
.more-products-card {
    background: linear-gradient(135deg, #e63946 0%, #c1121f 100%);
    border-radius: 20px;
    padding: 40px 32px 32px;
    text-align: center;
    color: white;
    position: relative;
    margin-top: 48px;
    overflow: hidden;
}

.more-products-card::before {
    content: '';
    position: absolute;
    top: -60px;
    right: -60px;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
}

.more-products-card::after {
    content: '';
    position: absolute;
    bottom: -40px;
    left: -40px;
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
}

.more-products-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(4px);
    padding: 6px 18px;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.more-products-title {
    font-size: 1.8em;
    margin: 0 0 12px;
    font-weight: 700;
}

.more-products-desc {
    font-size: 1.05em;
    opacity: 0.92;
    margin: 0 auto 28px;
    max-width: 520px;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

.more-products-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.more-products-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 12px;
    color: white;
    text-decoration: none;
    font-size: 0.95em;
    font-weight: 600;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    min-width: 140px;
    justify-content: center;
    cursor: pointer;
    border: none;
    outline: none;
}

.more-products-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
}

.more-products-taobao {
    background: linear-gradient(135deg, #ff5000, #ff7a00);
}

.more-products-douyin {
    background: linear-gradient(135deg, #161823, #2d1b69);
}

.more-products-wechat {
    background: linear-gradient(135deg, #07c160, #06ad56);
}

/* 产品视频展示 */
.product-videos {
    padding: 80px 0;
    background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
}

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

@media (max-width: 768px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
}

.video-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 28px rgba(0,0,0,0.12);
}

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 */
    background: #1a1a2e;
    overflow: hidden;
}

.video-thumbnail video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 72px;
    height: 72px;
    background: rgba(0,0,0,0.5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
}

.video-card:hover .video-play-btn {
    background: rgba(230,57,70,0.85);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-info {
    padding: 16px 20px;
}

.video-info h3 {
    font-size: 1.15em;
    margin-bottom: 6px;
    color: var(--text-color);
}

.video-info p {
    font-size: 0.9em;
    color: var(--gray-dark);
    margin-bottom: 8px;
    line-height: 1.5;
}

.video-tag {
    display: inline-block;
    background: #fff3e0;
    color: #e65100;
    font-size: 0.78em;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 500;
}

/* 视频弹窗 */
.video-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.85);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
}

.video-modal.active {
    display: flex;
}

.video-modal-content {
    position: relative;
    width: 90%;
    max-width: 900px;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.video-modal-content video {
    width: 100%;
    display: block;
    border-radius: 12px;
}

.video-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: 2em;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.video-modal-close:hover {
    opacity: 1;
}

/* 服务优势 */
.services {
    background: linear-gradient(135deg, var(--light-color) 0%, white 100%);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

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

.service-icon {
    font-size: 3em;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.5em;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.service-card p {
    color: var(--gray-medium);
    line-height: 1.8;
}

/* 关于我们 */
.about {
    background: white;
}

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

.about-text h2 {
    font-size: 2.5em;
    margin-bottom: 25px;
    color: var(--dark-color);
}

.about-text p {
    color: var(--gray-medium);
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 1.1em;
}

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

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5em;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-label {
    color: var(--gray-medium);
    font-size: 0.9em;
}

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

.about-placeholder {
    width: 100%;
    height: 500px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
}

.about-logo {
    font-size: 4em;
    font-weight: bold;
    margin-bottom: 20px;
}

.about-placeholder p {
    font-size: 1.2em;
}

/* 联系我们 */
.contact {
    background: var(--gray-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    background: white;
    padding: 25px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    align-items: center;
}

.contact-icon {
    font-size: 2em;
    flex-shrink: 0;
}

.contact-text h3 {
    font-size: 1.2em;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.contact-text p {
    color: var(--gray-medium);
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.contact-wechat-hint {
    margin-top: 20px;
    padding: 14px 18px;
    background: #f0fdf4;
    border-radius: 10px;
    border: 1px solid #bbf7d0;
    font-size: 0.92em;
    text-align: center;
}

.contact-wechat-hint span {
    color: var(--gray-dark);
}

.contact-wechat-hint a {
    color: #07c160;
    font-weight: 600;
    text-decoration: none;
    margin-left: 6px;
}

.contact-wechat-hint a:hover {
    text-decoration: underline;
}

/* 新闻板块 */
.news {
    background: var(--gray-light);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.news-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
}

.news-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.news-category {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 500;
}

.news-content {
    padding: 25px;
    padding-top: 50px;
}

.news-title {
    font-size: 1.3em;
    margin-bottom: 15px;
    color: var(--dark-color);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-summary {
    color: var(--gray-medium);
    margin-bottom: 20px;
    line-height: 1.8;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    font-size: 0.9em;
    color: var(--gray-dark);
}

.news-date,
.news-source {
    display: flex;
    align-items: center;
    gap: 5px;
}

.news-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.news-link:hover {
    color: var(--dark-color);
}

.news-load-more {
    text-align: center;
}

/* 新闻模态框 */
.news-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.news-modal.active {
    opacity: 1;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
}

.modal-content {
    position: relative;
    max-width: 800px;
    margin: 50px auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--gray-light);
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
}

.modal-close:hover {
    background: var(--primary-color);
    color: white;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 30px 40px 20px;
    border-bottom: 1px solid var(--gray-light);
}

.modal-category {
    background: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9em;
}

.modal-date {
    color: var(--gray-medium);
}

.modal-title {
    font-size: 2em;
    padding: 20px 40px;
    color: var(--dark-color);
    line-height: 1.4;
}

.modal-meta {
    padding: 0 40px 20px;
    color: var(--gray-medium);
}

.modal-body {
    padding: 20px 40px 30px;
    line-height: 1.8;
    color: var(--text-color);
}

.modal-body p {
    margin-bottom: 20px;
}

.modal-footer {
    padding: 20px 40px 40px;
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    border-top: 1px solid var(--gray-light);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark-color);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--gray-light);
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

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

/* 页脚 */
.footer {
    background: var(--dark-color);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.5em;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

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

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

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
    margin-bottom: 5px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 40px;
        transition: left 0.3s ease;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

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

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero-title {
        font-size: 2.5em;
    }

    .hero-subtitle {
        font-size: 1.5em;
    }

    .hero-desc {
        font-size: 1em;
    }

    .section-header h2 {
        font-size: 2em;
    }

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

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

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

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

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

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

/* 微信客服悬浮按钮 */
.wechat-kf-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 900;
    display: flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, #07c160, #06ad56);
    color: white;
    padding: 14px 22px;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(7, 193, 96, 0.4);
    transition: all 0.3s ease;
    cursor: pointer;
    animation: kf-pulse 3s ease-in-out infinite;
}

.wechat-kf-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 24px rgba(7, 193, 96, 0.55);
}

.wechat-kf-btn svg {
    flex-shrink: 0;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.15));
}

.wechat-kf-text {
    font-size: 0.95em;
    font-weight: 600;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

@keyframes kf-pulse {
    0%, 100% { box-shadow: 0 4px 16px rgba(7, 193, 96, 0.4); }
    50% { box-shadow: 0 4px 24px rgba(7, 193, 96, 0.65); }
}

@media (max-width: 768px) {
    .wechat-kf-btn {
        bottom: 20px;
        right: 20px;
        padding: 12px 18px;
    }
    .wechat-kf-text {
        font-size: 0.85em;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .about-stats {
        grid-template-columns: 1fr 1fr;
    }
}