/* ============================================
   西安博宇电气有限公司 - 网站样式表
   设计原则：简洁清晰、核心突出、响应式适配
   ============================================ */

/* CSS 变量 */
:root {
    --primary: #1a5fb4;
    --primary-dark: #154a8c;
    --primary-light: #e8f0fe;
    --secondary: #2ec27e;
    --accent: #f5a623;
    --text: #1c1c1c;
    --text-secondary: #5e5e5e;
    --text-light: #8a8a8a;
    --bg: #ffffff;
    --bg-gray: #f5f7fa;
    --bg-dark: #0f172a;
    --border: #e2e8f0;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
    --container-max: 1200px;
    --header-height: 72px;
}

/* 重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    line-height: 1.7;
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

/* 容器 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   按钮
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    white-space: nowrap;
}

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

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

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.5);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

/* ============================================
   导航栏
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--border);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

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

.logo-img {
    height: 40px;
    width: auto;
    max-width: 180px;
    object-fit: contain;
}

.footer-logo {
    height: 36px;
    width: auto;
    max-width: 160px;
    object-fit: contain;
}

.nav-list {
    display: flex;
    gap: 36px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
}

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

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

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

.header-contact .phone {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

/* ============================================
   首页 Banner
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--bg-dark);
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(26,95,180,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(46,194,126,0.1) 0%, transparent 40%),
        linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 80px;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-text .highlight {
    color: #60a5fa;
}

.hero-desc {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.75);
    margin-bottom: 36px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 24px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    backdrop-filter: blur(5px);
}

.stat-num {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #60a5fa;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
}

/* ============================================
   页面标题区域（独立页面使用）
   ============================================ */
.page-hero {
    position: relative;
    min-height: 320px;
    display: flex;
    align-items: center;
    background: var(--bg-dark);
    overflow: hidden;
    padding-top: var(--header-height);
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(26,95,180,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(46,194,126,0.1) 0%, transparent 40%),
        linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.page-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.page-hero .container {
    position: relative;
    z-index: 2;
    text-align: center;
    padding-top: 40px;
    padding-bottom: 40px;
}

.page-hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.page-hero p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.4);
    font-size: 0.8rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255,255,255,0.4);
    border-bottom: 2px solid rgba(255,255,255,0.4);
    transform: rotate(45deg);
}

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

/* ============================================
   通用区块
   ============================================ */
.section {
    padding: 100px 0;
}

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

.section-dark {
    background: var(--bg-dark);
    color: #fff;
}

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

.section-header.light .section-tag,
.section-header.light .section-title,
.section-header.light .section-subtitle {
    color: #fff;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

/* ============================================
   关于博宇
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: stretch;
}

.about-intro {
    padding-top: 20px;
    display: flex;
    flex-direction: column;
}

.about-intro p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.9;
}

.about-intro.compact p {
    font-size: 0.92rem;
    line-height: 1.65;
    margin-bottom: 10px;
}

.about-intro .link-arrow {
    margin-top: auto;
}

.about-intro strong {
    color: var(--primary);
    font-weight: 600;
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 500;
    margin-top: 12px;
}

.link-arrow:hover {
    gap: 10px;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.feature-card {
    padding: 28px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: transparent;
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text);
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   产品中心
   ============================================ */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.product-card {
    position: relative;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.product-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.product-badge.hot {
    background: #fef3c7;
    color: #b45309;
}

.product-badge.new {
    background: #dbeafe;
    color: #1e40af;
}

/* 产品图片轮播 */
.product-image-slider {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    background: var(--bg-gray);
}

.product-image-slider .slider-track {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.5s ease;
}

.product-image-slider .slider-track img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    flex-shrink: 0;
    padding: 8px;
}

.product-image-slider .slider-dots {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 6px;
}

.product-image-slider .slider-dots .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(0,0,0,0.2);
    cursor: pointer;
    transition: var(--transition);
}

.product-image-slider .slider-dots .dot.active {
    background: var(--primary);
}

/* 荣誉/标准滚动 */
.scroll-section {
    margin-top: 60px;
}

.scroll-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 24px;
    text-align: center;
    color: var(--text);
}

.scroll-container {
    overflow: hidden;
    position: relative;
    padding: 10px 0;
}

.scroll-container::before,
.scroll-container::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 60px;
    z-index: 2;
    pointer-events: none;
}

.scroll-container::before {
    left: 0;
    background: linear-gradient(to right, var(--bg), transparent);
}

.scroll-container::after {
    right: 0;
    background: linear-gradient(to left, var(--bg), transparent);
}

.scroll-track {
    display: flex;
    gap: 24px;
    animation: scroll-left 40s linear infinite;
    width: max-content;
}

.scroll-container:hover .scroll-track {
    animation-play-state: paused;
}

@keyframes scroll-left {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.scroll-item {
    flex-shrink: 0;
    width: 220px;
    text-align: center;
}

.scroll-item img {
    width: 100%;
    height: 160px;
    object-fit: contain;
    border-radius: var(--radius-sm);
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 8px;
    transition: var(--transition);
}

.scroll-item:hover img {
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

.scroll-item p {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 技术优势图片滚动 */
.tech-image-scroll {
    margin-top: 32px;
    overflow: hidden;
    position: relative;
    padding: 10px 0;
}

.tech-image-scroll::before,
.tech-image-scroll::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 60px;
    z-index: 2;
    pointer-events: none;
}

.tech-image-scroll::before {
    left: 0;
    background: linear-gradient(to right, var(--bg), transparent);
}

.tech-image-scroll::after {
    right: 0;
    background: linear-gradient(to left, var(--bg), transparent);
}

.tech-scroll-track {
    display: flex;
    gap: 20px;
    animation: tech-scroll-left 25s linear infinite;
    width: max-content;
}

.tech-image-scroll:hover .tech-scroll-track {
    animation-play-state: paused;
}

@keyframes tech-scroll-left {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.tech-scroll-track img {
    flex-shrink: 0;
    width: 200px;
    height: 140px;
    object-fit: contain;
    border-radius: var(--radius-sm);
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 6px;
    transition: var(--transition);
}

.tech-scroll-track img:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow);
}

/* 页脚品牌 */
.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.product-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.product-sub {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

.product-features {
    margin-bottom: 24px;
}

.product-features li {
    font-size: 0.88rem;
    color: var(--text-secondary);
    padding: 6px 0;
    padding-left: 18px;
    position: relative;
    border-bottom: 1px solid var(--border);
}

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

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

/* ============================================
   技术优势
   ============================================ */
.tech-content {
    max-width: 900px;
    margin: 0 auto;
}

.tech-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tech-tab {
    padding: 12px 28px;
    border: 1px solid var(--border);
    background: var(--bg);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

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

.tech-tab.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.tech-panel {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tech-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.panel-item {
    padding: 28px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.panel-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.panel-item h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--primary);
}

.panel-item p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

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

.contact-info {
    display: grid;
    gap: 20px;
}

.info-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    transition: var(--transition);
}

.info-card:hover {
    background: rgba(255,255,255,0.08);
    transform: translateX(4px);
}

.info-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.info-content h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: #fff;
}

.info-content p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.65);
    line-height: 1.6;
}

.contact-form-wrapper {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 40px;
}

.contact-form h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: #fff;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255,255,255,0.4);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255,255,255,0.12);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='rgba(255,255,255,0.5)' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.form-group select option {
    background: var(--bg-dark);
    color: #fff;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: #080c14;
    color: rgba(255,255,255,0.6);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

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



.footer-desc {
    font-size: 0.88rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.5);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 16px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 0.88rem;
    color: rgba(255,255,255,0.5);
}

.footer-links a:hover {
    color: #fff;
}

.footer-contact p {
    font-size: 0.88rem;
    margin-bottom: 8px;
    color: rgba(255,255,255,0.5);
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 0.82rem;
    color: rgba(255,255,255,0.35);
}

.footer-bottom a {
    color: rgba(255,255,255,0.5);
    text-decoration: underline;
}

.footer-bottom a:hover {
    color: #fff;
}

/* ============================================
   表单状态提示
   ============================================ */
.form-status {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    line-height: 1.5;
    animation: fadeIn 0.3s ease;
}

.form-status--success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-status--error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.contact-form button[type="submit"]:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   页脚二维码
   ============================================ */
.footer-qrcodes {
    display: flex;
    justify-content: center;
    gap: 50px;
    padding: 30px 0;
    border-top: 1px solid rgba(255,255,255,0.08);
    margin-top: 30px;
    flex-wrap: wrap;
}

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

.qr-item img {
    width: 110px;
    height: 110px;
    border-radius: 8px;
    background: #fff;
    padding: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
    object-fit: contain;
}

.qr-item p {
    margin-top: 10px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.7);
}

/* ============================================
   回到顶部
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

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

/* 平板 (<= 1024px) */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-text h1 {
        font-size: 2.8rem;
    }

    .hero-btns {
        justify-content: center;
    }

    .hero-stats {
        max-width: 500px;
        margin: 0 auto;
    }

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

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

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

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

/* 手机 (<= 768px) */
@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(10px);
        padding: 20px 24px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-150%);
        opacity: 0;
        transition: var(--transition);
        pointer-events: none;
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

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

    .nav-link {
        display: block;
        padding: 12px 0;
        font-size: 1rem;
        border-bottom: 1px solid var(--border);
    }

    .nav-link::after {
        display: none;
    }

    .header-contact {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

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

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

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

    .hero-text h1 {
        font-size: 2.2rem;
    }

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

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .stat-item {
        padding: 16px;
    }

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

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

    .tech-tabs {
        gap: 8px;
    }

    .tech-tab {
        padding: 10px 18px;
        font-size: 0.88rem;
    }

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

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-qrcodes {
        gap: 30px;
    }

    .qr-item img {
        width: 90px;
        height: 90px;
    }

    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
        font-size: 1rem;
    }
}

/* 小屏手机 (<= 480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-text h1 {
        font-size: 1.8rem;
    }

    .page-hero {
        min-height: 240px;
    }

    .page-hero h1 {
        font-size: 1.8rem;
    }

    .page-hero p {
        font-size: 0.95rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .product-card {
        padding: 24px;
    }

    .contact-form-wrapper {
        padding: 24px;
    }

    .scroll-item {
        width: 160px;
    }

    .scroll-item img {
        height: 120px;
    }

    .tech-scroll-track img {
        width: 160px;
        height: 110px;
    }

    .product-image-slider {
        height: 160px;
    }
}

/* 大屏桌面 (>= 1440px) */
@media (min-width: 1440px) {
    :root {
        --container-max: 1320px;
    }

    .hero-text h1 {
        font-size: 4rem;
    }
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}