/* 基础样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Microsoft YaHei', Arial, sans-serif; line-height: 1.6; color: #333; background: #fff; }

/* 配色方案 */
:root {
    --primary: #0066CC;
    --dark: #003366;
    --accent: #FF6600;
    --light: #F5F7FA;
    --grey: #666;
}

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

/* 顶部栏 */
.top-bar { background: var(--dark); color: white; padding: 10px 0; font-size: 14px; }
.top-bar .container { display: flex; justify-content: flex-end; gap: 2rem; }

/* 导航栏 */
.header { background: white; box-shadow: 0 2px 10px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 1000; }
.header .container { display: flex; justify-content: space-between; align-items: center; padding: 15px 20px; }
.logo h1 { font-size: 28px; color: var(--dark); }
.logo h1 span { color: var(--accent); }
.logo-en { font-size: 12px; color: var(--grey); letter-spacing: 2px; }
.nav { display: flex; gap: 2rem; }
.nav a { text-decoration: none; color: #333; font-weight: 500; transition: color 0.3s; }
.nav a:hover, .nav a.active { color: var(--primary); }
.btn-quote { background: var(--accent); color: white; padding: 10px 25px; text-decoration: none; border-radius: 5px; font-weight: bold; transition: transform 0.3s; }
.btn-quote:hover { transform: translateY(-2px); }

/* 横幅 */
.hero { background: linear-gradient(135deg, var(--dark), var(--primary)); color: white; padding: 100px 20px; text-align: center; }
.hero h2 { font-size: 42px; margin-bottom: 1rem; }
.hero p { font-size: 20px; opacity: 0.9; margin-bottom: 3rem; }
.hero-stats { display: flex; justify-content: center; gap: 4rem; margin-bottom: 3rem; }
.hero-stats .stat { text-align: center; }
.hero-stats .num { font-size: 48px; font-weight: bold; color: var(--accent); display: block; }
.hero-stats .label { font-size: 14px; opacity: 0.8; }
.hero-btns { display: flex; justify-content: center; gap: 1.5rem; }
.btn { display: inline-block; padding: 12px 30px; text-decoration: none; border-radius: 5px; font-weight: bold; transition: all 0.3s; }
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: #e55a00; transform: translateY(-3px); }
.btn-outline { background: transparent; color: white; border: 2px solid white; }
.btn-outline:hover { background: white; color: var(--primary); transform: translateY(-3px); }
.btn-large { padding: 15px 50px; font-size: 18px; }

/* 通用区块 */
section { padding: 80px 20px; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-header h2 { font-size: 36px; color: var(--dark); margin-bottom: 0.5rem; }
.section-header .subtitle { color: var(--accent); font-size: 14px; letter-spacing: 3px; text-transform: uppercase; }

/* 关于我们 */
.about { background: white; }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.about-text p { margin-bottom: 1.5rem; color: #666; line-height: 1.8; }
.about-features { list-style: none; margin-bottom: 2rem; }
.about-features li { padding: 0.5rem 0; color: var(--dark); font-weight: 500; }
.placeholder-img { background: var(--light); height: 350px; display: flex; align-items: center; justify-content: center; border-radius: 10px; color: #999; font-size: 18px; }

/* 产品中心 */
.products { background: var(--light); }
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 3rem; }
.product-card { background: white; padding: 2.5rem 2rem; border-radius: 10px; text-align: center; transition: transform 0.3s, box-shadow 0.3s; }
.product-card:hover { transform: translateY(-10px); box-shadow: 0 15px 30px rgba(0,0,0,0.1); }
.product-icon { font-size: 48px; margin-bottom: 1rem; }
.product-card h3 { color: var(--dark); margin-bottom: 1rem; font-size: 20px; }
.product-card p { color: #666; margin-bottom: 1.5rem; }
.product-card .link { color: var(--primary); text-decoration: none; font-weight: 500; }
.center-btn { text-align: center; }

/* 核心优势 */
.advantages { background: var(--dark); color: white; }
.advantages .section-header h2 { color: white; }
.adv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; }
.adv-card { text-align: center; padding: 2rem; }
.adv-icon { font-size: 48px; margin-bottom: 1rem; }
.adv-card h3 { font-size: 20px; margin-bottom: 0.5rem; }
.adv-card p { opacity: 0.8; }

/* 应用领域 */
.applications { background: white; }
.app-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1.5rem; }
.app-card { background: var(--light); padding: 2rem; text-align: center; border-radius: 10px; border: 2px solid transparent; transition: all 0.3s; }
.app-card:hover { border-color: var(--primary); transform: translateY(-5px); }
.app-icon { font-size: 40px; display: block; margin-bottom: 1rem; }
.app-card h3 { color: var(--dark); font-size: 16px; }

/* 联系我们 CTA */
.contact-cta { background: linear-gradient(135deg, var(--primary), var(--dark)); color: white; text-align: center; padding: 80px 20px; }
.contact-cta h2 { font-size: 36px; margin-bottom: 1rem; }
.contact-cta p { font-size: 18px; opacity: 0.9; margin-bottom: 3rem; }
.contact-info { display: flex; justify-content: center; gap: 4rem; margin-bottom: 3rem; flex-wrap: wrap; }
.contact-item { display: flex; align-items: center; gap: 1rem; text-align: left; }
.contact-item .icon { font-size: 32px; }
.contact-item strong { display: block; margin-bottom: 0.25rem; }
.contact-item p { opacity: 0.9; font-size: 14px; }

/* 页脚 */
.footer { background: #1a1a2e; color: white; padding: 60px 20px 30px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 3rem; margin-bottom: 3rem; }
.footer-col h3 { color: var(--accent); margin-bottom: 1.5rem; font-size: 18px; }
.footer-col p { opacity: 0.8; line-height: 1.8; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.8rem; opacity: 0.8; }
.footer-col ul li a { color: white; text-decoration: none; transition: color 0.3s; }
.footer-col ul li a:hover { color: var(--accent); }
.qr-placeholder { width: 120px; height: 120px; background: white; display: flex; align-items: center; justify-content: center; color: #333; border-radius: 5px; }
.footer-bottom { text-align: center; padding-top: 2rem; border-top: 1px solid rgba(255,255,255,0.1); opacity: 0.7; font-size: 14px; }

/* 响应式 */
@media (max-width: 768px) {
    .top-bar .container { justify-content: center; flex-wrap: wrap; }
    .header .container { flex-wrap: wrap; gap: 1rem; }
    .nav { display: none; }
    .hero h2 { font-size: 28px; }
    .hero-stats { flex-direction: column; gap: 2rem; }
    .hero-btns { flex-direction: column; align-items: center; }
    .about-content { grid-template-columns: 1fr; }
    .contact-info { flex-direction: column; gap: 2rem; }
}