```css
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #FF7F3F;
    --primary-dark: #E86A2A;
    --primary-light: #FFA76B;
    --secondary: #2D3E50;
    --accent: #FFB347;
    --bg: #FFFFFF;
    --bg-alt: #FFF8F3;
    --text: #2C3E50;
    --text-light: #5D6D7E;
    --border: #F0E6DD;
    --card-bg: #FFFFFF;
    --shadow: 0 4px 20px rgba(255, 127, 63, 0.08);
    --shadow-hover: 0 8px 30px rgba(255, 127, 63, 0.15);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary: #FF9F5A;
    --primary-dark: #E86A2A;
    --primary-light: #FFB88C;
    --secondary: #E0E0E0;
    --accent: #FFC97A;
    --bg: #1A1A2E;
    --bg-alt: #16213E;
    --text: #E8E8E8;
    --text-light: #B0B0B0;
    --border: #2A2A4A;
    --card-bg: #1F1F3A;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.8;
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden;
}

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

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

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

/* 导航吸顶 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition), box-shadow var(--transition);
}

[data-theme="dark"] .navbar {
    background: rgba(26, 26, 46, 0.95);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.nav-brand svg {
    width: 36px;
    height: 36px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text);
}

.theme-toggle:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 6px 16px;
    transition: all var(--transition);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 127, 63, 0.15);
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.9rem;
    color: var(--text);
    width: 140px;
    font-family: inherit;
}

.search-box input::placeholder {
    color: var(--text-light);
}

.search-box button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    display: flex;
    align-items: center;
    padding: 0;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text);
    padding: 8px;
}

/* 主内容区 */
.main-content {
    margin-top: 72px;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Banner轮播 */
.banner-section {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #FFF5EE 0%, #FFE8D6 50%, #FFDBC2 100%);
    min-height: 480px;
}

[data-theme="dark"] .banner-section {
    background: linear-gradient(135deg, #1A1A2E 0%, #16213E 50%, #1F1F3A 100%);
}

.banner-slides {
    display: flex;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.banner-slide {
    min-width: 100%;
    padding: 80px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-content {
    max-width: 1280px;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.banner-text h1 {
    font-size: 2.8rem;
    font-weight: 900;
    line-height: 1.25;
    color: var(--secondary);
    margin-bottom: 20px;
    letter-spacing: -1px;
}

[data-theme="dark"] .banner-text h1 {
    color: var(--text);
}

.banner-text h1 .highlight {
    color: var(--primary);
    position: relative;
}

.banner-text h1 .highlight::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    right: 0;
    height: 8px;
    background: rgba(255, 127, 63, 0.2);
    border-radius: 4px;
    z-index: -1;
}

.banner-text p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 32px;
    line-height: 1.9;
}

.banner-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255, 127, 63, 0.35);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(255, 127, 63, 0.45);
    color: #fff;
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.banner-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.banner-visual svg {
    width: 100%;
    max-width: 420px;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(255, 127, 63, 0.15));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.banner-dots {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.banner-dots button {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 127, 63, 0.3);
    cursor: pointer;
    transition: all var(--transition);
    padding: 0;
}

.banner-dots button.active {
    background: var(--primary);
    width: 32px;
    border-radius: 5px;
}

/* 数字统计 */
.stats-section {
    padding: 60px 0;
    background: var(--bg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-card {
    text-align: center;
    padding: 32px 16px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.stat-number {
    font-size: 2.4rem;
    font-weight: 900;
    color: var(--primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-top: 8px;
}

/* 通用区块 */
.section {
    padding: 80px 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

[data-theme="dark"] .section-header h2 {
    color: var(--text);
}

.section-header p {
    font-size: 1.05rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* 品牌介绍 */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 16px;
}

[data-theme="dark"] .about-text h3 {
    color: var(--text);
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 16px;
    font-size: 1rem;
    line-height: 1.9;
}

.about-visual {
    display: flex;
    justify-content: center;
}

.about-visual svg {
    width: 100%;
    max-width: 380px;
    height: auto;
}

/* 功能特点 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

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

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

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(255, 127, 63, 0.1), rgba(255, 179, 71, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--primary);
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 10px;
}

[data-theme="dark"] .feature-card h3 {
    color: var(--text);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.8;
}

/* 内容文章卡片 */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

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

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.article-category {
    background: rgba(255, 127, 63, 0.1);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.8rem;
}

.article-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 12px;
    line-height: 1.5;
}

[data-theme="dark"] .article-card h3 {
    color: var(--text);
}

.article-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 16px;
}

.article-link {
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

/* FAQ */
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
    transition: all var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-light);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--secondary);
    text-align: left;
    font-family: inherit;
    gap: 16px;
    transition: color var(--transition);
}

[data-theme="dark"] .faq-question {
    color: var(--text);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-icon {
    flex-shrink: 0;
    transition: transform var(--transition);
    color: var(--primary);
}

.faq-item.open .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s;
    padding: 0 24px;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding: 0 24px 20px;
}

.faq-answer p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.9;
}

/* HowTo教程 */
.howto-steps {
    max-width: 900px;
    margin: 0 auto;
    counter-reset: step;
}

.howto-step {
    position: relative;
    padding: 0 0 40px 72px;
    counter-increment: step;
}

.howto-step::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-weight: 800;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(255, 127, 63, 0.3);
}

.howto-step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 23px;
    top: 52px;
    bottom: 8px;
    width: 2px;
    background: var(--border);
}

.howto-step h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 10px;
}

[data-theme="dark"] .howto-step h3 {
    color: var(--text);
}

.howto-step p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.9;
}

/* 客户评价 */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

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

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.testimonial-stars {
    color: #FFB347;
    margin-bottom: 16px;
    font-size: 1.1rem;
    letter-spacing: 2px;
}

.testimonial-text {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 20px;
    font-style: italic;
}

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

.testimonial-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.testimonial-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--secondary);
}

[data-theme="dark"] .testimonial-name {
    color: var(--text);
}

.testimonial-role {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* 新闻中心 */
.news-list {
    max-width: 900px;
    margin: 0 auto;
}

.news-item {
    display: flex;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

.news-item:last-child {
    border-bottom: none;
}

.news-item:hover {
    padding-left: 8px;
}

.news-date {
    flex-shrink: 0;
    width: 80px;
    text-align: center;
    padding: 8px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
}

.news-date-day {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.news-date-month {
    font-size: 0.8rem;
    color: var(--text-light);
}

.news-content h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 6px;
}

[data-theme="dark"] .news-content h3 {
    color: var(--text);
}

.news-content p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* 联系方式 */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 24px;
}

[data-theme="dark"] .contact-info h3 {
    color: var(--text);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(255, 127, 63, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 2px;
}

.contact-item p {
    font-size: 1rem;
    color: var(--secondary);
    font-weight: 500;
}

[data-theme="dark"] .contact-item p {
    color: var(--text);
}

.contact-map {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-map h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 16px;
}

[data-theme="dark"] .contact-map h3 {
    color: var(--text);
}

.contact-map p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.9;
}

/* 页脚 */
.footer {
    background: var(--secondary);
    color: #B0B0C0;
    padding: 64px 0 32px;
}

[data-theme="dark"] .footer {
    background: #0F0F1A;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
}

.footer-brand svg {
    width: 32px;
    height: 32px;
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 20px;
}

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

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: #B0B0C0;
    font-size: 0.9rem;
    transition: color var(--transition);
}

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

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p {
    font-size: 0.85rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: #B0B0C0;
    font-size: 0.85rem;
}

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

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(255, 127, 63, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(255, 127, 63, 0.5);
}

/* 面包屑 */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.85rem;
    color: var(--text-light);
}

.breadcrumb ol {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.breadcrumb ol li {
    display: flex;
    align-items: center;
    gap: 8px;
}

.breadcrumb ol li::after {
    content: '/';
    color: var(--border);
}

.breadcrumb ol li:last-child::after {
    display: none;
}

.breadcrumb a {
    color: var(--text-light);
}

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

/* 滚动动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 24px;
    z-index: 999;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.mobile-menu.open {
    display: block;
}

.mobile-menu ul {
    list-style: none;
}

.mobile-menu ul li {
    margin-bottom: 16px;
}

.mobile-menu ul li a {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text);
    display: block;
    padding: 8px 0;
}

/* 响应式 */
@media (max-width: 1024px) {
    .banner-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

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

    .banner-cta {
        justify-content: center;
    }

    .banner-visual {
        order: -1;
    }

    .banner-visual svg {
        max-width: 320px;
    }

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

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

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

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

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

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .search-box {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

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

    .section-header h2 {
        font-size: 1.6rem;
    }

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

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

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

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .news-item {
        flex-direction: column;
        gap: 12px;
    }

    .news-date {
        width: 100%;
        display: flex;
        gap: 8px;
        align-items: center;
        justify-content: center;
    }

    .howto-step {
        padding-left: 60px;
    }

    .howto-step::before {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .howto-step:not(:last-child)::after {
        left: 19px;
        top: 44px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .banner-text h1 {
        font-size: 1.5rem;
    }

    .banner-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .stat-number {
        font-size: 1.5rem;
    }
}

/* 图片懒加载占位 */
.lazy-img {
    background: linear-gradient(90deg, var(--bg-alt) 25%, var(--border) 50%, var(--bg-alt) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 站内搜索高亮 */
.search-highlight {
    background: rgba(255, 127, 63, 0.2);
    border-radius: 2px;
    padding: 0 2px;
}

/* 服务承诺 */
.promise-bar {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    padding: 24px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin-bottom: 48px;
}

.promise-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.promise-item svg {
    color: var(--primary);
    flex-shrink: 0;
}
```