/* ========================================
   雷俏锂电 - 现代企业网站样式系统
   ======================================== */

/* CSS变量定义 */
:root {
    /* 主色调 - 科技蓝 */
    --primary-color: #0056B3;
    --primary-light: #1976D2;
    --primary-dark: #003d82;
    
    /* 辅助色 - 清新青 */
    --accent-color: #00C4CC;
    --accent-light: #26D9DE;
    
    /* 点缀色 - 活力橙 */
    --highlight-color: #FF6B00;
    --highlight-hover: #FF8533;
    
    /* 中性色 */
    --text-primary: #1a1a1a;
    --text-secondary: #555555;
    --text-muted: #888888;
    --bg-light: #f5f7fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    
    /* 字体 */
    --font-primary: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    --font-mono: 'Roboto', 'Inter', sans-serif;
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-white);
    overflow-x: hidden;
}

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

a:hover {
    color: var(--primary-color);
}

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

ul, ol {
    list-style: none;
}

/* ========================================
   头部导航
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-top {
    background: var(--primary-color);
    color: white;
    padding: 6px 0;
    font-size: 14px;
}

.header-top-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-top a {
    color: white;
}

.header-top a:hover {
    color: var(--accent-color);
}

.contact-info {
    display: flex;
    gap: 24px;
}

.contact-info span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    height: 50px;
    width: auto;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.logo-text span {
    color: var(--accent-color);
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-menu a {
    padding: 10px 18px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: all var(--transition-fast);
    transform: translateX(-50%);
}

.nav-menu a:hover {
    color: var(--primary-color);
    background: rgba(0, 86, 179, 0.05);
}

.nav-menu a:hover::after {
    width: 24px;
}

.nav-menu a.active {
    color: var(--primary-color);
    background: rgba(0, 86, 179, 0.08);
}

.header-cta {
    display: flex;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-highlight {
    background: var(--highlight-color);
    color: white;
}

.btn-highlight:hover {
    background: var(--highlight-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   横幅区域
   ======================================== */
.banner-section {
    margin-top: 107px;
    position: relative;
    overflow: hidden;
    height: 500px;
}

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

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease;
}

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

.banner-slide-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(0, 30, 60, 0.75) 0%, rgba(0, 30, 60, 0.4) 100%);
}

.banner-content {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
    height: 100%;
    display: flex;
    align-items: center;
}

.banner-text {
    max-width: 600px;
    color: white;
}

.banner-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    opacity: transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.banner-subtitle {
    font-size: 20px;
    line-height: 1.6;
    margin-bottom: 32px;
    opacity: 0.9;
    opacity: transform: translateY(30px);
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.banner-buttons {
    display: flex;
    gap: 16px;
    opacity: transform: translateY(30px);
    animation: fadeInUp 0.8s ease 0.4s forwards;
}

.banner-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

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

.banner-dot.active {
    background: var(--accent-color);
    transform: scale(1.2);
}

.banner-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.15);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    transition: all var(--transition-fast);
}

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

.banner-nav.prev {
    left: 20px;
}

.banner-nav.next {
    right: 20px;
}

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

/* ========================================
   公告区域
   ======================================== */
.notice-bar {
    background: linear-gradient(135deg, #fff9e6 0%, #fff3cd 100%);
    border-bottom: 1px solid #ffeeba;
    padding: 12px 0;
}

.notice-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.notice-label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #856404;
    font-weight: 600;
    font-size: 14px;
    white-space: nowrap;
}

.notice-label svg {
    width: 18px;
    height: 18px;
}

.notice-content {
    flex: 1;
    overflow: hidden;
}

.notice-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.notice-list li a {
    color: #856404;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color var(--transition-fast);
}

.notice-list li a:hover {
    color: var(--highlight-color);
}

.notice-list li a::before {
    content: '›';
    font-weight: bold;
}

/* ========================================
   产品分类区
   ======================================== */
.products-section {
    padding: 60px 0;
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.product-categories {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.category-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.category-header {
    padding: 30px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.category-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.category-icon svg {
    width: 36px;
    height: 36px;
}

.category-title h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.category-title span {
    font-size: 14px;
    color: var(--text-muted);
}

.category-products {
    padding: 0 30px 30px;
}

.category-products ul {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.category-products li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.category-products li a:hover {
    background: var(--primary-color);
    color: white;
}

.category-products li a::before {
    content: '→';
    font-size: 12px;
    transition: transform var(--transition-fast);
}

.category-products li a:hover::before {
    transform: translateX(4px);
}

.category-more {
    padding: 20px 30px 30px;
}

.category-more a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 14px;
}

.category-more a:hover {
    color:var(--highlight-color);
}

/* ========================================
   关于我们区
   ======================================== */
.about-section {
    padding: 80px 0;
    background: white;
}

.about-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-content {
    padding-right: 20px;
}

.about-content .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.about-text {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.about-feature-icon {
    width: 40px;
    height: 40px;
    background: rgba(0, 86, 179, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.about-feature-text h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.about-feature-text p {
    font-size: 13px;
    color: var(--text-muted);
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.about-image::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
    border-radius: var(--radius-lg);
    z-index: -1;
    opacity: 0.3;
}

/* ========================================
   统计数据区
   ======================================== */
.stats-section {
    padding: 60px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.stats-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    padding: 20px;
}

.stat-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 28px;
}

.stat-number {
    font-size: 42px;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 16px;
    opacity: 0.9;
}

/* ========================================
   解决方案区
   ======================================== */
.solutions-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.solutions-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.solution-card {
    position: relative;
    height: 320px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
}

.solution-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

.solution-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 30px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
}

.solution-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}

.solution-desc {
    font-size: 14px;
    opacity: 0.85;
    transform: translateY(20px);
    opacity: 0;
    transition: all var(--transition-normal);
}

.solution-card:hover .solution-desc {
    transform: translateY(0);
    opacity: 1;
}

/* ========================================
   合作伙伴区
   ======================================== */
.partners-section {
    padding: 60px 0;
    background: white;
}

.partners-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 30px;
    align-items: center;
}

.partner-logo {
    padding: 20px;
    text-align: center;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: all var(--transition-normal);
}

.partner-logo:hover {
    filter: grayscale(0%);
    opacity: 1;
}

.partner-logo img {
    max-width: 100%;
    height: auto;
    margin: 0 auto;
}

/* ========================================
   联系我们区
   ======================================== */
.contact-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
}

.contact-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h2 {
    font-size: 32px;
    margin-bottom: 24px;
}

.contact-info p {
    font-size: 16px;
    line-height: 1.8;
    opacity: 0.85;
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    flex-shrink: 0;
}

.contact-text h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    opacity: 0.7;
}

.contact-text p {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.contact-form {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    color: var(--text-primary);
}

.contact-form h3 {
    font-size: 24px;
    margin-bottom: 24px;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: var(--font-primary);
    transition: border-color var(--transition-fast);
}

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

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

.contact-form .btn {
    width: 100%;
    padding: 16px;
    font-size: 16px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: #0f0f1a;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 30px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand .logo-text {
    color: white;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all var(--transition-fast);
}

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

.footer-column h4 {
    color: white;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-column a {
    font-size: 14px;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom a:hover {
    color: var(--accent-color);
}

/* ========================================
   标签页
   ======================================== */
.tabs-section {
    padding: 60px 0;
    background: white;
}

.tabs-header {
    max-width: 1200px;
    margin: 0 auto 30px;
    padding: 0 20px;
    display: flex;
    gap: 8px;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 14px 28px;
    background: none;
    border: none;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    transition: all var(--transition-fast);
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform var(--transition-fast);
}

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

.tab-btn.active {
    color: var(--primary-color);
}

.tab-btn.active::after {
    transform: scaleX(1);
}

.tab-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: none;
}

.tab-content.active {
    display: block;
}

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

.news-card {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.news-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

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

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

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

.news-info {
    padding: 20px;
}

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

.news-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .product-categories {
        grid-template-columns: 1fr;
    }
    
    .about-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-content {
        padding-right: 0;
    }
    
    .about-image {
        order: -1;
    }
    
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .header-top {
        display: none;
    }
    
    .header-main {
        padding: 12px 16px;
    }
    
    .nav-menu {
        display: none;
    }
    
    .nav-menu.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        padding: 20px;
        box-shadow: var(--shadow-md);
    }
    
    .mobile-menu-btn {
        display: flex;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
        padding: 10px;
    }
    
    .mobile-menu-btn span {
        width: 24px;
        height: 2px;
        background: var(--text-primary);
        transition: all var(--transition-fast);
    }
    
    .banner-section {
        height: 400px;
        margin-top: 70px;
    }
    
    .banner-title {
        font-size: 32px;
    }
    
    .banner-subtitle {
        font-size: 16px;
    }
    
    .banner-buttons {
        flex-direction: column;
    }
    
    .section-title {
        font-size: 26px;
    }
    
    .products-section,
    .about-section,
    .solutions-section,
    .tabs-section,
    .contact-section {
        padding: 40px 0;
    }
    
    .stats-inner {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-number {
        font-size: 32px;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    
    .tabs-header {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-btn {
        white-space: nowrap;
    }
    
    .tab-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .banner-section {
        height: 350px;
    }
    
    .banner-content {
        padding: 40px 16px;
    }
    
    .banner-title {
        font-size: 26px;
    }
    
    .category-products ul {
        grid-template-columns: 1fr;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .stats-inner {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .partners-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   动画效果
   ======================================== */
.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.slide-up {
    animation: slideUp 0.6s ease forwards;
}

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

/* 滚动触发动画 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   实用工具类
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

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

.text-accent {
    color: var(--accent-color);
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 40px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 40px; }

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}