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

:root {
    /* 橙红色主题 */
    --primary: #FF6B35;
    --primary-dark: #E85D2E;
    --primary-light: #FF8C5A;
    --secondary: #F7931E;
    --secondary-dark: #E6820A;
    --accent: #FFA07A;
    --bg-gradient-1: #FFF5F0;
    --bg-gradient-2: #FFE8DF;
    --text-dark: #2C2C2C;
    --text-medium: #666666;
    --text-light: #999999;
    --white: #FFFFFF;
    --border: #E8E8E8;
    --shadow-sm: 0 2px 8px rgba(255, 107, 53, 0.1);
    --shadow-md: 0 4px 16px rgba(255, 107, 53, 0.15);
    --shadow-lg: 0 8px 32px rgba(255, 107, 53, 0.2);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background: var(--white);
    overflow-x: hidden;
}

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

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.navbar {
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-icon {
    font-size: 1.8rem;
}

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

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

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

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

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

/* ===== Hero区域 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 100%);
    position: relative;
    overflow: hidden;
}

.hero-bg-animation {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(255, 107, 53, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(247, 147, 30, 0.1) 0%, transparent 50%);
    animation: float 20s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(5deg); }
    66% { transform: translate(-20px, 20px) rotate(-5deg); }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    margin-bottom: 1.5rem;
}

.title-main {
    display: block;
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.title-sub {
    display: block;
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-top: 0.5rem;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.badge {
    padding: 0.5rem 1rem;
    background: var(--white);
    border: 2px solid var(--primary-light);
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
}

.image-wrapper {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.image-wrapper img {
    width: 100%;
    height: auto;
    display: block;
}

.image-decoration {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    opacity: 0.2;
    z-index: -1;
    animation: pulse 3s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.2; }
    50% { transform: scale(1.1); opacity: 0.3; }
}

/* ===== 按钮样式 ===== */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-block {
    width: 100%;
}

/* ===== 区块标题 ===== */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-medium);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

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

.text-left .section-subtitle {
    margin: 0;
}

/* ===== 核心优势 ===== */
.advantages {
    padding: 80px 0;
    background: var(--white);
}

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

.advantage-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.card-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.advantage-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

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

/* ===== 产品服务 ===== */
.products {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.product-card {
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.product-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.product-content {
    padding: 2rem;
}

.product-tag {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    color: var(--white);
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.product-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.product-content p {
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.product-features {
    list-style: none;
    margin: 1.5rem 0;
}

.product-features li {
    padding: 0.5rem 0;
    color: var(--text-medium);
    font-size: 0.95rem;
}

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

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

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

.solutions-grid {
    display: grid;
    gap: 3rem;
}

.solution-item {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3rem;
    background: var(--white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.solution-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-lg);
}

.solution-image {
    width: 100%;
    height: 100%;
    min-height: 300px;
    overflow: hidden;
}

.solution-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.solution-content {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.solution-content h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.solution-content p {
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.solution-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.solution-features span {
    padding: 0.5rem 1rem;
    background: var(--bg-gradient-1);
    border: 1px solid var(--primary-light);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 600;
}

/* ===== 客户案例 ===== */
.cases {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.case-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.case-header {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

.case-logo {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--bg-gradient-1);
    flex-shrink: 0;
}

.case-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.case-info h3 {
    font-size: 1.2rem;
    margin-bottom: 0.3rem;
    color: var(--text-dark);
}

.case-industry {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
}

.case-desc {
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.case-stats {
    display: flex;
    justify-content: space-around;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.3rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-medium);
}

/* ===== 统计数据 ===== */
.stats {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

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

.stat-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    opacity: 0.95;
}

.stat-desc {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ===== 关于我们 ===== */
.about {
    padding: 80px 0;
    background: var(--white);
}

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

.about-text {
    max-width: 600px;
}

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

.about-image {
    position: relative;
}

.image-container {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.image-container img {
    width: 100%;
    height: auto;
    display: block;
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(247, 147, 30, 0.2));
}

/* ===== 联系我们 ===== */
.contact {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
}

.contact-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
}

.contact-form-wrapper h3,
.contact-info-wrapper h3 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.form-desc {
    color: var(--text-medium);
    margin-bottom: 2rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

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

.form-group textarea {
    resize: vertical;
}

.form-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 10px;
    display: none;
}

.form-message.success {
    background: #D1FAE5;
    color: #065F46;
    display: block;
}

.form-message.error {
    background: #FEE2E2;
    color: #991B1B;
    display: block;
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.info-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.info-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--bg-gradient-1);
    flex-shrink: 0;
}

.info-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.info-content h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    color: var(--text-dark);
}

.info-content p {
    color: var(--text-medium);
    line-height: 1.6;
}

.contact-map {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.contact-map img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-col h4 {
    margin-bottom: 1rem;
    color: var(--primary-light);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

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

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
}

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

/* ===== 动画类 ===== */
.animate-fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-fade-up-delay {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease 0.2s, transform 0.6s ease 0.2s;
}

.animate-fade-up-delay.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

.animate-scale-in-delay {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease 0.1s, transform 0.6s ease 0.1s;
}

.animate-scale-in-delay.visible {
    opacity: 1;
    transform: scale(1);
}

.animate-scale-in-delay-2 {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease 0.2s, transform 0.6s ease 0.2s;
}

.animate-scale-in-delay-2.visible {
    opacity: 1;
    transform: scale(1);
}

.animate-scale-in-delay-3 {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease 0.3s, transform 0.6s ease 0.3s;
}

.animate-scale-in-delay-3.visible {
    opacity: 1;
    transform: scale(1);
}

.animate-scale-in-delay-4 {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease 0.4s, transform 0.6s ease 0.4s;
}

.animate-scale-in-delay-4.visible {
    opacity: 1;
    transform: scale(1);
}

.animate-scale-in-delay-5 {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease 0.5s, transform 0.6s ease 0.5s;
}

.animate-scale-in-delay-5.visible {
    opacity: 1;
    transform: scale(1);
}

.animate-slide-up {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-slide-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-slide-up-delay {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease 0.1s, transform 0.8s ease 0.1s;
}

.animate-slide-up-delay.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-slide-up-delay-2 {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease 0.2s, transform 0.8s ease 0.2s;
}

.animate-slide-up-delay-2.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-slide-up-delay-3 {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease 0.3s, transform 0.8s ease 0.3s;
}

.animate-slide-up-delay-3.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-slide-up-delay-4 {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease 0.4s, transform 0.8s ease 0.4s;
}

.animate-slide-up-delay-4.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-slide-up-delay-5 {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease 0.5s, transform 0.8s ease 0.5s;
}

.animate-slide-up-delay-5.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-fade-in {
    opacity: 0;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-fade-in.visible {
    opacity: 1;
}

.animate-fade-in-delay {
    opacity: 0;
    transition: opacity 0.6s ease 0.2s, transform 0.6s ease 0.2s;
}

.animate-fade-in-delay.visible {
    opacity: 1;
}

.animate-fade-in-delay-2 {
    opacity: 0;
    transition: opacity 0.6s ease 0.4s, transform 0.6s ease 0.4s;
}

.animate-fade-in-delay-2.visible {
    opacity: 1;
}

.animate-fade-in-delay-3 {
    opacity: 0;
    transition: opacity 0.6s ease 0.6s, transform 0.6s ease 0.6s;
}

.animate-fade-in-delay-3.visible {
    opacity: 1;
}

.animate-slide-right {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-slide-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-slide-left {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-slide-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-count-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-count-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-count-up-delay {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease 0.2s, transform 0.6s ease 0.2s;
}

.animate-count-up-delay.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-count-up-delay-2 {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease 0.4s, transform 0.6s ease 0.4s;
}

.animate-count-up-delay-2.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-count-up-delay-3 {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease 0.6s, transform 0.6s ease 0.6s;
}

.animate-count-up-delay-3.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        max-width: 100%;
    }

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

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

    .solution-item {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
        gap: 1rem;
    }

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

    .nav-toggle {
        display: flex;
    }

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

    .title-sub {
        font-size: 1.5rem;
    }

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

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

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

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

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

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

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