:root {
    --main-color: #8B0000;
    --sub-color: #c41e3a;
    --bg-color: #fdf6f3;
    --text-color: #2a0f12;
    --card-bg: #ffffff;
    --text-secondary: #7a4448;
    --border-color: #f0d9d5;
    --radius: 6px;
    --shadow: 0 2px 14px rgba(139,0,0,0.08);
}
* {margin:0;padding:0;box-sizing:border-box;}
html {scroll-behavior:smooth;background:var(--bg-color);color:var(--text-color);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased;}
body {background:var(--bg-color);min-height:100vh;overflow-x:hidden;}
a {color:inherit;text-decoration:none;}
img {max-width:100%;display:block;}
.container {max-width:1200px;margin:0 auto;padding:0 20px;}
/* 导航 */
.nav {position:fixed;top:0;left:0;right:0;background:rgba(255,255,255,0.95);backdrop-filter:blur(12px);box-shadow:0 1px 8px rgba(0,0,0,0.06);z-index:999;}
.nav-inner {display:flex;align-items:center;justify-content:space-between;height:70px;}
.logo {font-size:22px;font-weight:700;color:var(--main-color);letter-spacing:1px;}
.nav-menu {display:flex;gap:32px;list-style:none;}
.nav-menu a {font-size:15px;color:var(--text-color);font-weight:500;transition:color .2s;}
.nav-menu a:hover {color:var(--main-color);}
.hamburger {display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--main-color);}
/* Hero */
.hero {padding-top:70px;position:relative;min-height:560px;display:flex;align-items:center;overflow:hidden;}
.hero-bg {position:absolute;inset:0;}
.hero-bg img {width:100%;height:100%;object-fit:cover;}
.hero-bg::after {content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(0,0,0,0.65),rgba(0,0,0,0.4));}
.hero-content {position:relative;z-index:2;color:#fff;max-width:600px;}
.hero h1 {font-size:48px;line-height:1.25;margin-bottom:20px;font-weight:700;}
.hero p {font-size:18px;opacity:.9;margin-bottom:32px;line-height:1.7;}
.btn {display:inline-block;padding:14px 36px;background:var(--main-color);color:#fff;border-radius:var(--radius);font-size:16px;font-weight:500;transition:transform .2s,box-shadow .2s;border:none;cursor:pointer;}
.btn:hover {transform:translateY(-2px);box-shadow:var(--shadow);}
/* 通用 */
.section {padding:80px 0;}
.section-title {text-align:center;font-size:32px;font-weight:700;margin-bottom:12px;color:var(--text-color);}
.section-sub {text-align:center;color:var(--text-secondary);font-size:16px;margin-bottom:48px;}
/* 服务条 */
.services {background:var(--card-bg);border-top:1px solid var(--border-color);border-bottom:1px solid var(--border-color);}
.services-grid {display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:32px 0;}
.service-item {display:flex;align-items:center;gap:14px;}
.service-item i {font-size:28px;color:var(--main-color);}
.service-item h4 {font-size:15px;margin-bottom:4px;}
.service-item p {font-size:13px;color:var(--text-secondary);margin:0;}
/* 关于 */
.about-grid {display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;}
.about-img img {border-radius:var(--radius);box-shadow:var(--shadow);width:100%;aspect-ratio:4/3;object-fit:cover;}
.about-text h2 {font-size:30px;margin-bottom:20px;font-weight:700;line-height:1.3;}
.about-text p {color:var(--text-secondary);margin-bottom:16px;font-size:15px;}
.stats {display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:28px;}
.stat-num {font-size:32px;font-weight:700;color:var(--main-color);}
.stat-label {font-size:13px;color:var(--text-secondary);}
/* 优势 */
.advantages-grid {display:grid;grid-template-columns:repeat(4,1fr);gap:28px;}
.adv-card {background:var(--card-bg);padding:32px 24px;border-radius:var(--radius);box-shadow:var(--shadow);text-align:center;transition:transform .25s;}
.adv-card:hover {transform:translateY(-6px);}
.adv-card i {font-size:40px;color:var(--main-color);margin-bottom:16px;}
.adv-card h3 {font-size:18px;margin-bottom:10px;}
.adv-card p {font-size:14px;color:var(--text-secondary);line-height:1.7;margin:0;}
/* 产品 */
.products-grid {display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
.product-card {background:var(--card-bg);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s;cursor:pointer;}
.product-card:hover {transform:translateY(-6px);}
.product-img {aspect-ratio:4/3;overflow:hidden;}
.product-img img {width:100%;height:100%;object-fit:cover;transition:transform .4s;}
.product-card:hover .product-img img {transform:scale(1.06);}
.product-info {padding:20px;}
.product-info h3 {font-size:17px;margin-bottom:8px;}
.product-info p {font-size:13px;color:var(--text-secondary);margin:0;line-height:1.6;}
/* 文章 */
.articles-grid {display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
.article-card {background:var(--card-bg);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s;cursor:pointer;}
.article-card:hover {transform:translateY(-6px);}
.article-img {aspect-ratio:16/10;overflow:hidden;}
.article-img img {width:100%;height:100%;object-fit:cover;}
.article-body {padding:22px;}
.article-body h3 {font-size:17px;margin-bottom:10px;line-height:1.4;}
.article-body p {font-size:14px;color:var(--text-secondary);line-height:1.7;margin:0;}
.article-meta {display:flex;gap:16px;font-size:12px;color:var(--text-secondary);margin-bottom:10px;}
/* FAQ */
.faq-list {max-width:800px;margin:0 auto;}
.faq-item {background:var(--card-bg);border-radius:var(--radius);margin-bottom:14px;box-shadow:var(--shadow);overflow:hidden;}
.faq-q {padding:20px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:15px;}
.faq-q i {transition:transform .3s;color:var(--main-color);}
.faq-item.open .faq-q i {transform:rotate(180deg);}
.faq-a {max-height:0;overflow:hidden;transition:max-height .3s ease;}
.faq-a-inner {padding:0 24px 20px;color:var(--text-secondary);font-size:14px;line-height:1.8;}
.faq-item.open .faq-a {max-height:240px;}
/* CTA */
.cta {background:linear-gradient(135deg,var(--main-color),var(--sub-color));color:#fff;text-align:center;padding:64px 0;}
.cta h2 {font-size:32px;margin-bottom:16px;}
.cta p {font-size:16px;opacity:.9;margin-bottom:28px;}
.cta .btn {background:#fff;color:var(--main-color);}
/* 页脚 */
.footer {background:#1a1a1a;color:#bbb;padding:56px 0 0;}
.footer-grid {display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;}
.footer h4 {color:#fff;font-size:16px;margin-bottom:18px;}
.footer p,.footer a {font-size:14px;line-height:2;color:#999;}
.footer ul {list-style:none;}
.footer a:hover {color:var(--main-color);}
.friend-links {border-top:1px solid #2a2a2a;padding:18px 0;font-size:13px;display:flex;flex-wrap:wrap;gap:20px;color:#777;}
.friend-links a {color:#777;}
.copyright {border-top:1px solid #2a2a2a;padding:20px 0;text-align:center;font-size:13px;color:#777;}
.copyright a {color:#aaa;}
/* 文章页 */
.breadcrumb {padding:90px 0 20px;font-size:14px;color:var(--text-secondary);}
.breadcrumb a:hover {color:var(--main-color);}
.article-page {padding-bottom:80px;}
.article-header {margin-bottom:40px;}
.article-header h1 {font-size:34px;line-height:1.3;margin-bottom:16px;}
.article-meta-info {display:flex;gap:24px;color:var(--text-secondary);font-size:14px;padding-bottom:20px;border-bottom:1px solid var(--border-color);}
.article-body-text {font-size:16px;line-height:1.9;color:var(--text-color);}
.article-body-text h2 {font-size:22px;margin:32px 0 16px;color:var(--text-color);}
.article-body-text p {margin-bottom:16px;color:#333;}
.article-body-text img {width:100%;border-radius:var(--radius);margin:20px 0;}
.tags {margin-top:36px;padding:20px 0;border-top:1px solid var(--border-color);display:flex;gap:10px;flex-wrap:wrap;}
.tag {padding:6px 14px;background:var(--bg-color);border:1px solid var(--border-color);border-radius:20px;font-size:13px;color:var(--text-secondary);}
.article-layout {display:grid;grid-template-columns:1fr 300px;gap:40px;}
.sidebar-widget {background:var(--card-bg);padding:24px;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:24px;}
.sidebar-widget h4 {font-size:16px;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--main-color);display:inline-block;}
.related-item {display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--border-color);}
.related-item:last-child {border:none;}
.related-item img {width:80px;height:60px;object-fit:cover;border-radius:4px;flex-shrink:0;}
.related-item h5 {font-size:14px;line-height:1.5;margin:0 0 4px;}
.related-item a:hover h5 {color:var(--main-color);}
.back-home {display:inline-block;margin-top:10px;color:var(--main-color);font-weight:500;}
/* 响应式 */
@media(max-width:992px){
  .services-grid,.advantages-grid,.products-grid,.articles-grid {grid-template-columns:repeat(2,1fr);}
  .about-grid {grid-template-columns:1fr;gap:32px;}
  .article-layout {grid-template-columns:1fr;}
  .footer-grid {grid-template-columns:1fr 1fr;gap:28px;}
}
@media(max-width:768px){
  .nav-menu {display:none;position:absolute;top:70px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;gap:16px;box-shadow:0 4px 12px rgba(0,0,0,0.1);}
  .nav-menu.show {display:flex;}
  .hamburger {display:block;}
  .hero h1 {font-size:30px;}
  .hero p {font-size:15px;}
  .section {padding:56px 0;}
  .section-title {font-size:24px;}
  .services-grid,.advantages-grid,.products-grid,.articles-grid,.stats {grid-template-columns:1fr 1fr;gap:16px;}
  .footer-grid {grid-template-columns:1fr 1fr;}
  .article-header h1 {font-size:24px;}
}
@media(max-width:480px){
  .services-grid,.advantages-grid,.products-grid,.articles-grid {grid-template-columns:1fr;}
  .footer-grid {grid-template-columns:1fr;}
}