/* ===================================
   年代智能科技 - 现代科技风格样式表
   设计理念：科技感、渐变色、简洁大方
   =================================== */

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

:root {
    /* 主色调 - 科技蓝紫渐变 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5568d3;

    /* 强调色 - 亮青色 */
    --accent-color: #00d4ff;
    --accent-gradient: linear-gradient(135deg, #00d4ff 0%, #0099ff 100%);

    /* 次要色 - 橙色 */
    --secondary-color: #ff6b35;
    --secondary-gradient: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);

    /* 中性色 */
    --dark-bg: #0f0c29;
    --dark-bg-2: #1a1642;
    --dark-bg-3: #24243e;
    --light-bg: #ffffff;
    --light-bg-2: #f8f9fa;
    --light-bg-3: #e9ecef;

    /* 文本色 */
    --text-dark: #2d3748;
    --text-gray: #4a5568;
    --text-light: #718096;
    --text-white: #ffffff;

    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.4);

    /* 边框圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 过渡动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 字体 */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-heading: "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    background-color: var(--light-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ===================================
   导航栏样式
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-lg);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(102, 126, 234, 0.3));
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transform: translateX(-50%);
    transition: width var(--transition-normal);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

/* ===================================
   首页横幅 Hero Section
   =================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.gradient-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    opacity: 0.95;
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.hero-content {
    text-align: center;
    color: var(--text-white);
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease;
}

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

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.title-main {
    font-size: 4rem;
    font-weight: 800;
    font-family: var(--font-heading);
    letter-spacing: 2px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.title-sub {
    font-size: 1.8rem;
    font-weight: 400;
    opacity: 0.95;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-description {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 3rem;
    opacity: 0.9;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 4rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    outline: none;
}

.btn-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-normal);
}

.btn:hover .btn-icon {
    transform: translateX(5px);
}

.btn-primary {
    background: var(--light-bg);
    color: var(--primary-color);
    box-shadow: var(--shadow-xl);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(255, 255, 255, 0.3);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    border: 2px solid rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.8);
    transform: translateY(-3px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 4rem;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 10px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 2px;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% {
        opacity: 1;
        top: 10px;
    }
    100% {
        opacity: 0;
        top: 30px;
    }
}

.arrow {
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 8px solid rgba(255, 255, 255, 0.5);
}

/* ===================================
   通用区块样式
   =================================== */

section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header.align-left {
    text-align: left;
}

.section-tag {
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-gray);
}

/* ===================================
   产品中心
   =================================== */

.products {
    background: var(--light-bg-2);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.product-card {
    background: var(--light-bg);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.product-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.product-badge.hot {
    background: var(--secondary-gradient);
    color: var(--text-white);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.7);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 8px rgba(255, 107, 53, 0);
    }
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

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

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

.product-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-glow);
}

.product-icon svg {
    width: 40px;
    height: 40px;
    stroke: var(--text-white);
}

.product-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.product-desc {
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.product-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.product-features li {
    padding: 0.5rem 0;
    color: var(--text-gray);
    position: relative;
    padding-left: 1.5rem;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: 700;
}

.product-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--light-bg-3);
}

.product-views {
    font-size: 0.9rem;
    color: var(--text-light);
}

.product-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.product-link:hover {
    gap: 0.5rem;
    color: var(--primary-dark);
}

/* ===================================
   工程案例
   =================================== */

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

@media (min-width: 768px) and (max-width: 1200px) {
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1201px) {
    .cases-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.case-card {
    background: var(--light-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.case-image {
    position: relative;
    height: 250px;
    background: linear-gradient(135deg, #667eea40 0%, #764ba240 100%);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    overflow: hidden;
}

.case-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(102, 126, 234, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.case-image:hover .case-overlay {
    opacity: 1;
}

.case-view {
    padding: 0.8rem 1.5rem;
    background: var(--light-bg);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
}

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

.case-content {
    padding: 1.5rem;
}

.case-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.8rem;
}

.case-desc {
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.case-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: var(--light-bg-3);
    color: var(--text-gray);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

/* ===================================
   新闻资讯
   =================================== */

.news {
    background: var(--light-bg-2);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.news-card {
    background: var(--light-bg);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    display: flex;
    gap: 1.5rem;
    transition: all var(--transition-normal);
}

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

.news-date {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    background: var(--accent-gradient);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.date-day {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.date-month {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-top: 0.2rem;
}

.news-content {
    flex: 1;
}

.news-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.8rem;
    line-height: 1.4;
}

.news-excerpt {
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.news-link {
    display: inline-flex;
    align-items: center;
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.news-link:hover {
    gap: 0.5rem;
}

/* ===================================
   关于我们
   =================================== */

.about-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text {
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 2rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem;
    background: var(--light-bg-2);
    border-radius: var(--radius-md);
}

.feature-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-weight: 700;
    font-size: 1.2rem;
}

.feature-text {
    font-weight: 600;
    color: var(--text-dark);
}

.about-image {
    position: relative;
}

.image-placeholder {
    width: 100%;
    height: 500px;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
}

.image-placeholder svg {
    width: 150px;
    height: 150px;
    stroke: rgba(255, 255, 255, 0.5);
}

/* ===================================
   资料下载
   =================================== */

.downloads {
    background: var(--light-bg);
}

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

.download-card {
    background: var(--light-bg-2);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
}

.download-card.featured {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border: 2px solid var(--primary-color);
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.download-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.download-icon svg {
    width: 30px;
    height: 30px;
    stroke: var(--text-white);
}

.download-content {
    flex: 1;
}

.download-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.8rem;
}

.download-desc {
    font-size: 0.95rem;
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.download-info {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.85rem;
}

.file-type {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-gradient);
    color: var(--text-white);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.file-size {
    color: var(--text-light);
}

.download-count {
    color: var(--text-light);
}

.btn-download {
    position: absolute;
    top: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    padding: 0.8rem 1.2rem;
    background: var(--primary-gradient);
    color: var(--text-white);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.btn-download svg {
    width: 20px;
    height: 20px;
    stroke: var(--text-white);
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.download-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 6px 16px;
    background: var(--secondary-gradient);
    color: var(--text-white);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.download-features {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.feature-tag {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.download-commands {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-color);
}

.command-title {
    font-size: 0.85rem;
    color: var(--text-gray);
    margin-bottom: 0.3rem;
    margin-top: 0.5rem;
}

.command-title:first-child {
    margin-top: 0;
}

.command-code {
    display: block;
    padding: 8px 12px;
    background: #2d3748;
    color: #00d4ff;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    overflow-x: auto;
}

/* ===================================
   联系我们
   =================================== */

.contact {
    background: var(--light-bg-2);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
}

.contact-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.contact-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--text-white);
}

.contact-details h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.contact-details p {
    color: var(--text-gray);
    line-height: 1.6;
}

.contact-form {
    background: var(--light-bg);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.contact-form h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--light-bg-3);
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--text-dark);
    transition: all var(--transition-normal);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.full-width {
    width: 100%;
}

/* ===================================
   页脚
   =================================== */

.footer {
    background: var(--dark-bg);
    color: rgba(255, 255, 255, 0.8);
    padding: 3rem 0 1.5rem;
}

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

.footer-section h4 {
    color: var(--text-white);
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.footer-links,
.footer-contact {
    list-style: none;
}

.footer-links li,
.footer-contact li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* ===================================
   返回顶部按钮
   =================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--primary-gradient);
    border: none;
    box-shadow: var(--shadow-xl);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(102, 126, 234, 0.4);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-white);
}

/* ===================================
   响应式设计
   =================================== */

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--light-bg);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-normal);
        gap: 0;
    }

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

    .nav-link {
        padding: 1rem;
        width: 100%;
    }

    .title-main {
        font-size: 2.5rem;
    }

    .title-sub {
        font-size: 1.3rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-stats {
        flex-direction: column;
        gap: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .about-wrapper,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

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

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

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

@media (max-width: 480px) {
    .title-main {
        font-size: 2rem;
    }

    .title-sub {
        font-size: 1.1rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}

/* ===================================
   动画效果
   =================================== */

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.product-card:hover .product-icon {
    animation: float 2s ease-in-out infinite;
}

/* 页面加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

body {
    animation: fadeIn 0.5s ease;
}