/* 全局样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent: #ff6b6b;
    --text-dark: #1A2F2F;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
nav {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon img { height: 40px; width: auto; }
.logo-text { 
    font-size: 16px; 
    font-weight: 700; 
    background: var(--primary-gradient); 
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent; 
}
.nav-links { display: flex; gap: 30px; list-style: none; }
.nav-links a { 
    text-decoration: none; 
    color: var(--text-dark); 
    font-weight: 500; 
    transition: color 0.3s; 
}
.nav-links a:hover, .nav-links a.active { 
    background: var(--primary-gradient); 
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent; 
}

/* 首页 Hero */
.hero {
    background: var(--primary-gradient);
    color: white;
    padding: 150px 20px 100px;
    text-align: center;
}
.hero-title { 
    font-size: 72px; 
    font-weight: 700; 
    line-height: 1.1; 
    margin-bottom: 20px; 
}
.hero-desc { 
    font-size: 20px; 
    margin-bottom: 30px; 
    opacity: 0.9; 
}
.btn {
    display: inline-block;
    padding: 15px 40px;
    background: var(--accent);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s;
}
.btn:hover { transform: translateY(-2px); }

/* 首页产品展示 */
.products { padding: 100px 0; background: var(--bg-light); }
.section-title { 
    text-align: center; 
    font-size: 48px; 
    font-weight: 700; 
    margin-bottom: 50px; 
    background: var(--primary-gradient); 
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent; 
}
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}
.product-card {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s;
    text-align: center;
}
.product-card:hover { transform: translateY(-5px); }
.brand-logo {
    margin-bottom: 20px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.brand-logo img {
    max-height: 80px;
    max-width: 200px;
    object-fit: contain;
}
.product-icon { font-size: 48px; margin-bottom: 20px; }
.product-card h3 { font-size: 24px; margin-bottom: 10px; }
.product-model { 
    color: var(--accent); 
    font-weight: 600; 
    margin-bottom: 15px; 
}
.product-icon { font-size: 48px; margin-bottom: 20px; }
.product-features { 
    list-style: none; 
    margin-top: 15px; 
}
.product-features li { 
    padding: 5px 0; 
    border-bottom: 1px solid #eee; 
}

/* 关于我们 */
.about { padding: 100px 0; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-text h2 { font-size: 36px; margin-bottom: 20px; }
.stats { display: flex; gap: 30px; margin-top: 30px; }
.stat-item { text-align: center; }
.stat-number { 
    font-size: 36px; 
    font-weight: 700; 
    background: var(--primary-gradient); 
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent; 
}

/* 联系我们（首页部分） */
.contact { padding: 100px 0; background: var(--bg-light); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; }
.contact-info h3 { margin-top: 30px; margin-bottom: 15px; }
.info-item { margin-bottom: 15px; }
.info-item strong { display: block; margin-bottom: 5px; }

/* 页脚 */
footer { 
    background: var(--text-dark); 
    color: white; 
    text-align: center; 
    padding: 30px 0; 
}

/* 产品中心页面 */
.page-hero {
    background: var(--primary-gradient);
    color: white;
    padding: 150px 20px 80px;
    text-align: center;
}
.page-hero h1 { font-size: 48px; margin-bottom: 10px; }
.page-hero p { font-size: 20px; opacity: 0.9; }
.products-section { padding: 80px 0; }

/* 客户案例页面 */
.cases-section { padding: 80px 0; }
.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}
.case-card {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}
.case-card h3 { margin-bottom: 15px; }
.case-tag {
    display: inline-block;
    background: var(--primary-gradient);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    margin-top: 15px;
}

/* 联系我们页面 */
.contact-section { padding: 80px 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; }
.contact-info h2, .contact-form h2 { margin-bottom: 30px; }
.info-item { margin-bottom: 20px; }
.info-item strong { display: block; margin-bottom: 5px; color: var(--text-light); }
.contact-form .form-group { margin-bottom: 20px; }
.contact-form label { display: block; margin-bottom: 5px; font-weight: 500; }
.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
}
.contact-form textarea { resize: vertical; }

/* 响应式 */
@media (max-width: 768px) {
    .hero-title { font-size: 48px; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; }
    .nav-links { gap: 15px; }
    .logo-text { font-size: 14px; }
}