/* 全局样式与变量 */
:root {
  --primary: #ff6b35;
  --primary-dark: #e55a2b;
  --secondary: #1a1a2e;
  --accent: #16213e;
  --bg: #f8f9fa;
  --card-bg: rgba(255, 255, 255, 0.85);
  --text: #333;
  --text-light: #666;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --gradient: linear-gradient(135deg, #ff6b35, #ff8f5e);
  --max-width: 1280px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}
.dark-mode {
  --bg: #0f0f1a;
  --card-bg: rgba(30, 30, 50, 0.85);
  --text: #e0e0e0;
  --text-light: #aaa;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  --glass-bg: rgba(30, 30, 50, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  background: var(--bg);
  color: var(--text);
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.btn {
  display: inline-block; padding: 12px 32px; background: var(--gradient);
  color: #fff; border: none; border-radius: 50px; font-size: 1rem;
  font-weight: 600; cursor: pointer; transition: var(--transition);
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
}
.btn:hover { transform: translateY(-3px); box-shadow: 0 8px 25px rgba(255, 107, 53, 0.5); color: #fff; }
.glass-card {
  background: var(--glass-bg); backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px); border: 1px solid var(--glass-border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 30px;
  transition: var(--transition);
}
.glass-card:hover { transform: translateY(-5px); box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15); }
.section-title {
  font-size: 2.2rem; font-weight: 800; margin-bottom: 10px;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.section-subtitle { font-size: 1.1rem; color: var(--text-light); margin-bottom: 40px; text-align: center; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
img { max-width: 100%; height: auto; display: block; }
.lazy-img { opacity: 0; transition: opacity 0.6s ease; }
.lazy-img.loaded { opacity: 1; }
@media (max-width: 992px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 576px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } .section-title { font-size: 1.8rem; } }

/* 页眉 */
.header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05); transition: var(--transition);
}
.dark-mode .header { background: rgba(15, 15, 26, 0.85); border-bottom: 1px solid rgba(255, 255, 255, 0.05); }
.header.scrolled { box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px; max-width: var(--max-width); margin: 0 auto;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.6rem; font-weight: 800; color: var(--secondary); }
.dark-mode .logo { color: #fff; }
.logo svg { width: 40px; height: 40px; }
.nav { display: flex; gap: 25px; align-items: center; }
.nav a { font-size: 0.95rem; font-weight: 500; color: var(--text); padding: 5px 0; position: relative; }
.nav a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0;
  height: 2px; background: var(--gradient); transition: var(--transition);
}
.nav a:hover::after, .nav a.active::after { width: 100%; }
.dark-mode .nav a { color: #ccc; }
.nav a:hover, .dark-mode .nav a:hover { color: var(--primary); }
.menu-toggle { display: none; flex-direction: column; cursor: pointer; gap: 5px; background: none; border: none; padding: 5px; }
.menu-toggle span { width: 28px; height: 3px; background: var(--text); border-radius: 3px; transition: var(--transition); }
.dark-mode .menu-toggle span { background: #ccc; }
@media (max-width: 768px) {
  .nav {
    display: none; position: absolute; top: 70px; left: 0; width: 100%;
    background: var(--glass-bg); backdrop-filter: blur(20px);
    flex-direction: column; padding: 20px; gap: 15px;
    border-bottom: 1px solid var(--glass-border);
  }
  .nav.open { display: flex; }
  .menu-toggle { display: flex; }
}

/* 英雄区 */
.hero {
  position: relative; min-height: 90vh; display: flex; align-items: center;
  justify-content: center; background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
  overflow: hidden; padding-top: 80px;
}
.hero::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(255, 107, 53, 0.15), transparent 60%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}
.dark-mode .hero { background: linear-gradient(135deg, #0a0a15, #0f0f1a, #1a1a2e); }
@keyframes heroGlow {
  0% { transform: translate(0, 0); }
  100% { transform: translate(10%, 10%); }
}
.hero-content { position: relative; z-index: 2; text-align: center; max-width: 800px; padding: 0 20px; }
.hero h1 { font-size: 3.5rem; font-weight: 900; color: #fff; margin-bottom: 20px; line-height: 1.2; text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3); }
.hero h1 span { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.2rem; color: rgba(255, 255, 255, 0.85); margin-bottom: 30px; max-width: 600px; margin-left: auto; margin-right: auto; }
.hero-buttons { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.hero-buttons .btn-secondary { background: transparent; border: 2px solid rgba(255, 255, 255, 0.3); color: #fff; box-shadow: none; }
.hero-buttons .btn-secondary:hover { background: rgba(255, 255, 255, 0.1); border-color: var(--primary); }
.hero-slider { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); display: flex; gap: 12px; z-index: 3; }
.hero-slider span { width: 12px; height: 12px; border-radius: 50%; background: rgba(255, 255, 255, 0.3); cursor: pointer; transition: var(--transition); }
.hero-slider span.active { background: var(--primary); width: 30px; border-radius: 6px; }
@media (max-width: 768px) { .hero h1 { font-size: 2.2rem; } .hero p { font-size: 1rem; } }

/* 通用区块 */
.section { padding: 80px 0; }
.about { background: var(--bg); }
.dark-mode .about { background: var(--bg); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-text h2 { font-size: 2.2rem; font-weight: 800; margin-bottom: 20px; }
.about-text p { margin-bottom: 15px; color: var(--text-light); font-size: 1.05rem; }
.about-image svg { width: 100%; height: auto; border-radius: var(--radius); }
@media (max-width: 768px) { .about-grid { grid-template-columns: 1fr; } }

/* 统计区 */
.stats { background: var(--secondary); padding: 60px 0; color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; text-align: center; }
.stat-item h3 { font-size: 2.8rem; font-weight: 900; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-item p { font-size: 1rem; opacity: 0.8; margin-top: 5px; }
@media (max-width: 768px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

/* 产品、服务、团队、评价、常见问题、教程、新闻、合作伙伴、联系、页脚等通用卡片样式 */
.products { background: var(--bg); }
.dark-mode .products { background: var(--bg); }
.product-card { text-align: center; padding: 30px 20px; }
.product-card svg { width: 80px; height: 80px; margin-bottom: 15px; }
.product-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 10px; }
.product-card p { color: var(--text-light); font-size: 0.95rem; }

.services { background: var(--bg); }
.service-card { padding: 30px; text-align: center; }
.service-card svg { width: 60px; height: 60px; margin-bottom: 15px; }
.service-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; }
.service-card p { color: var(--text-light); font-size: 0.95rem; }

.team { background: var(--bg); }
.team-card { text-align: center; padding: 25px; }
.team-card svg { width: 100px; height: 100px; border-radius: 50%; margin: 0 auto 15px; }
.team-card h4 { font-size: 1.1rem; font-weight: 700; }
.team-card p { color: var(--text-light); font-size: 0.9rem; }

.testimonials { background: var(--bg); }
.testimonial-card { padding: 30px; position: relative; }
.testimonial-card::before { content: '"'; font-size: 4rem; position: absolute; top: 10px; left: 20px; opacity: 0.1; color: var(--primary); font-family: serif; }
.testimonial-card p { font-style: italic; margin-bottom: 15px; color: var(--text-light); }
.testimonial-card .author { font-weight: 600; color: var(--primary); }

.faq { background: var(--bg); }
.faq-item { border-bottom: 1px solid rgba(0, 0, 0, 0.08); padding: 15px 0; cursor: pointer; }
.dark-mode .faq-item { border-color: rgba(255, 255, 255, 0.08); }
.faq-question { display: flex; justify-content: space-between; align-items: center; font-weight: 600; font-size: 1.05rem; padding: 5px 0; }
.faq-question span { transition: var(--transition); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, opacity 0.4s ease; opacity: 0; color: var(--text-light); padding-top: 0; }
.faq-item.active .faq-answer { max-height: 500px; opacity: 1; padding-top: 15px; }
.faq-item.active .faq-question span { transform: rotate(45deg); }

.howto { background: var(--bg); }
.howto-steps { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.howto-step { display: flex; gap: 20px; align-items: flex-start; padding: 20px; background: var(--glass-bg); border-radius: var(--radius); backdrop-filter: blur(10px); border: 1px solid var(--glass-border); }
.howto-step .step-num { width: 40px; height: 40px; background: var(--gradient); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; flex-shrink: 0; }
.howto-step h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 5px; }
.howto-step p { color: var(--text-light); font-size: 0.95rem; }
@media (max-width: 768px) { .howto-steps { grid-template-columns: 1fr; } }

.news { background: var(--bg); }
.news-card { padding: 25px; }
.news-card .date { color: var(--primary); font-size: 0.85rem; font-weight: 600; margin-bottom: 8px; }
.news-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.news-card p { color: var(--text-light); font-size: 0.95rem; margin-bottom: 15px; }

.partners { background: var(--bg); text-align: center; }
.partners-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 30px; align-items: center; }
.partners-grid svg { width: 120px; height: 60px; opacity: 0.6; transition: var(--transition); }
.partners-grid svg:hover { opacity: 1; }

.contact { background: var(--bg); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 20px; }
.contact-info p { margin-bottom: 10px; color: var(--text-light); display: flex; align-items: center; gap: 10px; }
.contact-info svg { width: 24px; height: 24px; flex-shrink: 0; }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 12px 18px; margin-bottom: 15px; border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 12px; font-size: 1rem; background: var(--glass-bg);
  backdrop-filter: blur(10px); transition: var(--transition); color: var(--text);
}
.dark-mode .contact-form input, .dark-mode .contact-form textarea { background: rgba(30, 30, 50, 0.7); border-color: rgba(255, 255, 255, 0.1); color: #fff; }
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.15); }
.contact-form textarea { min-height: 120px; resize: vertical; }
@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; } }

/* 页脚 */
.footer { background: var(--secondary); color: rgba(255, 255, 255, 0.8); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; margin-bottom: 40px; }
.footer h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 15px; color: #fff; }
.footer a { color: rgba(255, 255, 255, 0.7); display: block; margin-bottom: 8px; font-size: 0.9rem; }
.footer a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); padding-top: 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 15px; font-size: 0.85rem; }
.footer-bottom a { display: inline; margin-right: 15px; }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 576px) { .footer-grid { grid-template-columns: 1fr; } }

/* 回到顶部、暗黑模式切换 */
.back-to-top {
  position: fixed; bottom: 30px; right: 30px; width: 50px; height: 50px;
  background: var(--gradient); border-radius: 50%; display: flex; align-items: center;
  justify-content: center; color: #fff; font-size: 1.5rem;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4); cursor: pointer;
  opacity: 0; visibility: hidden; transition: var(--transition); z-index: 999; border: none;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-5px); }
.dark-mode-toggle {
  position: fixed; bottom: 90px; right: 30px; width: 50px; height: 50px;
  background: var(--glass-bg); backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border); border-radius: 50%; display: flex;
  align-items: center; justify-content: center; cursor: pointer; z-index: 999;
  font-size: 1.3rem; box-shadow: var(--shadow); transition: var(--transition);
}
.dark-mode-toggle:hover { transform: scale(1.1); }

/* 面包屑、搜索条、滚动动画、文章、站点地图等辅助样式 */
.breadcrumb { display: flex; gap: 8px; flex-wrap: wrap; padding: 15px 0; font-size: 0.9rem; color: var(--text-light); }
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }
.search-bar { display: flex; max-width: 400px; margin: 20px auto; gap: 10px; }
.search-bar input { flex: 1; padding: 12px 18px; border: 1px solid rgba(0, 0, 0, 0.1); border-radius: 12px; font-size: 1rem; background: var(--glass-bg); backdrop-filter: blur(10px); color: var(--text); }
.dark-mode .search-bar input { background: rgba(30, 30, 50, 0.7); border-color: rgba(255, 255, 255, 0.1); color: #fff; }
.search-bar input:focus { outline: none; border-color: var(--primary); }
.search-bar button { padding: 12px 20px; background: var(--gradient); color: #fff; border: none; border-radius: 12px; cursor: pointer; transition: var(--transition); }
.search-bar button:hover { opacity: 0.9; }
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }
.howto-full { padding: 40px; margin-top: 30px; }
.howto-full h3 { font-size: 1.5rem; margin-bottom: 15px; }
.howto-full ul, .howto-full ol { margin-left: 20px; margin-bottom: 15px; color: var(--text-light); }
.howto-full li { margin-bottom: 8px; }
.howto-full .note { background: rgba(255, 107, 53, 0.1); padding: 15px; border-radius: 12px; border-left: 4px solid var(--primary); margin-bottom: 15px; }
.article-list { margin-top: 40px; }
.article-item { padding: 20px; margin-bottom: 15px; border-bottom: 1px solid rgba(0, 0, 0, 0.05); }
.dark-mode .article-item { border-color: rgba(255, 255, 255, 0.05); }
.article-item h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.article-item .date { color: var(--primary); font-size: 0.85rem; font-weight: 600; margin-bottom: 5px; }
.article-item p { color: var(--text-light); font-size: 0.95rem; margin-bottom: 10px; }
.article-item .read-more { color: var(--primary); font-weight: 600; cursor: pointer; }
.related-posts { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 30px; }
@media (max-width: 576px) { .related-posts { grid-template-columns: 1fr; } }
.sitemap-links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; margin-top: 20px; }
.sitemap-links a { font-size: 0.9rem; color: var(--text-light); }
.sitemap-links a:hover { color: var(--primary); }
@media (max-width: 768px) { .sitemap-links { grid-template-columns: 1fr 1fr; } }
@media (max-width: 576px) { .sitemap-links { grid-template-columns: 1fr; } }