/* 云界智汇 - 静态官网样式 */
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; color: #1f2937; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }

/* 导航 */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(255,255,255,0.95); backdrop-filter: blur(8px); border-bottom: 1px solid #f3f4f6; }
.site-header .inner { max-width: 1280px; margin: 0 auto; padding: 0 1rem; height: 5rem; display: flex; align-items: center; justify-content: space-between; }
.site-header .logo { height: 3rem; width: auto; }
.site-header nav { display: flex; align-items: center; gap: 2rem; }
.site-header nav a { font-weight: 600; font-size: 0.875rem; color: #111; }
.site-header nav a:hover { color: #2563eb; }
.site-header .cta { background: linear-gradient(to right, #2563eb, #06b6d4); color: #fff; padding: 0.5rem 1.25rem; border-radius: 0.5rem; font-weight: 600; font-size: 0.875rem; }
.site-header .cta:hover { opacity: 0.9; }
/* 导航下拉 - 我们的应用 */
.nav-drop-wrap { position: relative; }
.nav-drop-wrap .nav-drop-btn { background: none; border: none; font: inherit; font-weight: 600; font-size: 0.875rem; color: #111; cursor: pointer; display: inline-flex; align-items: center; gap: 0.25rem; padding: 0; }
.nav-drop-wrap .nav-drop-btn:hover { color: #2563eb; }
.nav-drop-wrap .nav-drop-menu { position: absolute; left: 0; top: 100%; padding-top: 0.5rem; opacity: 0; visibility: hidden; transform: translateY(-4px); transition: opacity 0.2s, transform 0.2s, visibility 0.2s; }
.nav-drop-wrap:hover .nav-drop-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-drop-menu-inner { background: #fff; border-radius: 0.5rem; box-shadow: 0 10px 25px -5px rgba(0,0,0,0.1); border: 1px solid #f3f4f6; padding: 0.25rem 0; min-width: 10rem; }
.nav-drop-menu-inner a { display: block; padding: 0.5rem 1rem; font-size: 0.875rem; color: #374151; }
.nav-drop-menu-inner a:hover { background: #f3f4f6; color: #2563eb; }
.nav-lang-wrap { display: inline-flex; align-items: center; gap: 0.25rem; padding: 0.5rem 1rem; border-radius: 0.5rem; background: linear-gradient(to right, #2563eb, #06b6d4); font-weight: 600; font-size: 0.875rem; color: rgba(255,255,255,0.85); }
.nav-lang-wrap .nav-lang { color: #fff; }
.nav-lang-wrap .nav-lang:hover { color: #fff; opacity: 0.9; }
.nav-lang-wrap .nav-lang-cur { color: rgba(255,255,255,0.7); font-weight: 500; }
.nav-lang { font-weight: 600; font-size: 0.875rem; }
.nav-lang:hover { color: #2563eb; }
/* 移动端菜单 */
.menu-btn { display: none; background: none; border: none; padding: 0.5rem; cursor: pointer; }
.menu-btn svg { width: 1.5rem; height: 1.5rem; }
@media (max-width: 1023px) {
  .site-header nav.desktop { display: none; }
  .menu-btn { display: block; }
}
.mobile-menu { display: none; position: fixed; top: 0; right: 0; bottom: 0; width: 100%; max-width: 20rem; background: #fff; z-index: 120; padding: 1.5rem; box-shadow: -4px 0 20px rgba(0,0,0,0.1); overflow-y: auto; }
.mobile-menu.open { display: block; }
.mobile-menu .close { float: right; background: none; border: none; padding: 0.5rem; cursor: pointer; }
.mobile-menu nav { margin-top: 3rem; }
.mobile-menu nav a { display: block; padding: 0.75rem; font-weight: 600; border-radius: 0.5rem; }
.mobile-menu nav a:hover { background: #f3f4f6; }
.mobile-menu .nav-products-label { padding: 0.75rem; font-size: 0.75rem; font-weight: 600; color: #6b7280; text-transform: uppercase; }
.mobile-menu .nav-products-sublinks { padding-left: 1rem; }
.mobile-menu .nav-products-sublinks a { font-size: 0.9375rem; font-weight: 500; }
.mobile-menu .nav-lang-wrap { display: inline-flex; align-items: center; gap: 0.25rem; margin: 0.75rem; padding: 0.5rem 1rem; border-radius: 0.5rem; background: linear-gradient(to right, #2563eb, #06b6d4); font-weight: 600; color: rgba(255,255,255,0.85); }
.mobile-menu .nav-lang-m { color: #fff; }
.mobile-menu .nav-lang-m:hover { color: #fff; opacity: 0.9; }
.mobile-menu .nav-lang-cur { color: rgba(255,255,255,0.7); font-weight: 500; }
.overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.2); z-index: 110; }
.overlay.open { display: block; }

/* 主内容区 */
main { padding-top: 5rem; min-height: 100vh; }

/* 容器 */
.container { max-width: 1280px; margin: 0 auto; padding: 0 1rem; }
@media (min-width: 640px) { .container { padding: 0 1.5rem; } }
@media (min-width: 1024px) { .container { padding: 0 2rem; } }

/* Hero */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,23,42,0.8), rgba(30,58,138,0.7), rgba(15,23,42,0.8)); }
.hero .container { position: relative; z-index: 1; text-align: center; }
.hero h1 { font-size: 2.25rem; font-weight: 700; color: #fff; margin-bottom: 1rem; }
@media (min-width: 640px) { .hero h1 { font-size: 3rem; } }
@media (min-width: 768px) { .hero h1 { font-size: 3.75rem; } }
@media (min-width: 1024px) { .hero h1 { font-size: 4.5rem; } }
.hero p { font-size: 1rem; color: #d1d5db; margin-bottom: 2rem; max-width: 48rem; margin-left: auto; margin-right: auto; }
@media (min-width: 640px) { .hero p { font-size: 1.25rem; } }
.hero-btns { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; }
.hero-btns a { display: inline-flex; align-items: center; justify-content: center; padding: 1rem 2rem; font-weight: 600; border-radius: 0.5rem; }
.hero-btns .primary { background: linear-gradient(to right, #2563eb, #06b6d4); color: #fff; }
.hero-btns .secondary { background: rgba(255,255,255,0.1); color: #fff; border: 2px solid rgba(255,255,255,0.2); }
.hero-btns .secondary:hover { background: rgba(255,255,255,0.2); }

/* Section 通用 */
.sec { padding: 5rem 0; }
.sec-alt { background: linear-gradient(135deg, #f8fafc, #eff6ff); }
.sec-title { text-align: center; margin-bottom: 3rem; }
.sec-title h2 { font-size: 1.875rem; font-weight: 700; color: #111; margin-bottom: 0.5rem; }
@media (min-width: 640px) { .sec-title h2 { font-size: 2.25rem; } }
.sec-title p { font-size: 1rem; color: #4b5563; max-width: 42rem; margin: 0 auto; }

/* 服务卡片 */
.services-grid { display: grid; gap: 2rem; }
@media (min-width: 768px) { .services-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .services-grid { grid-template-columns: repeat(3, 1fr); } }
.service-card { background: linear-gradient(135deg, #f9fafb, #fff); border: 1px solid #f3f4f6; border-radius: 1rem; padding: 2rem; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05); transition: box-shadow 0.2s, transform 0.2s; }
.service-card:hover { box-shadow: 0 20px 25px -5px rgba(0,0,0,0.08); transform: translateY(-4px); }
.service-card .icon { width: 3rem; height: 3rem; border-radius: 0.75rem; display: flex; align-items: center; justify-content: center; margin-bottom: 1.5rem; font-size: 1.5rem; }
.service-card h3 { font-size: 1.25rem; font-weight: 700; color: #111; margin-bottom: 0.75rem; }
.service-card p { color: #4b5563; font-size: 0.9375rem; }

/* 优势 */
.advantages-grid { display: grid; gap: 2rem; }
@media (min-width: 768px) { .advantages-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .advantages-grid { grid-template-columns: repeat(3, 1fr); } }
.advantage-card { background: #fff; padding: 2rem; border-radius: 1rem; text-align: center; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); }
.advantage-card .icon { width: 3rem; height: 3rem; margin: 0 auto 1.5rem; background: #dbeafe; color: #2563eb; border-radius: 9999px; display: flex; align-items: center; justify-content: center; font-size: 1.25rem; }
.advantage-card h3 { font-size: 1.25rem; font-weight: 700; color: #111; margin-bottom: 0.5rem; }
.advantage-card p { color: #4b5563; font-size: 0.9375rem; }

/* 流程 */
.process-grid { display: grid; gap: 2rem; }
@media (min-width: 768px) { .process-grid { grid-template-columns: repeat(4, 1fr); } }
.process-item { text-align: center; }
.process-item .num { width: 4rem; height: 4rem; margin: 0 auto 1rem; background: linear-gradient(to right, #2563eb, #06b6d4); color: #fff; border-radius: 9999px; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.25rem; }
.process-item h3 { font-size: 1.25rem; font-weight: 600; color: #111; margin-bottom: 0.5rem; }
.process-item p { color: #4b5563; font-size: 0.875rem; }

/* CTA */
.cta-sec { background: linear-gradient(to right, #2563eb, #06b6d4); color: #fff; padding: 5rem 1rem; text-align: center; }
.cta-sec h2 { font-size: 1.875rem; font-weight: 700; margin-bottom: 1rem; }
@media (min-width: 640px) { .cta-sec h2 { font-size: 2.25rem; } }
.cta-sec p { font-size: 1.25rem; opacity: 0.9; margin-bottom: 2rem; max-width: 42rem; margin-left: auto; margin-right: auto; }
.cta-sec a { display: inline-flex; align-items: center; justify-content: center; padding: 1rem 2rem; background: #fff; color: #2563eb; font-weight: 600; border-radius: 0.5rem; }
.cta-sec a:hover { background: #f3f4f6; }

/* 页头 Banner */
.page-hero { position: relative; padding: 5rem 0; min-height: 16rem; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.page-hero .hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.page-hero h1 { position: relative; z-index: 1; font-size: 2rem; font-weight: 700; color: #fff; margin-bottom: 0.5rem; }
@media (min-width: 640px) { .page-hero h1 { font-size: 2.5rem; } }
.page-hero p { position: relative; z-index: 1; color: #d1d5db; font-size: 1.125rem; }

/* 两栏布局 */
.two-col { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 1024px) { .two-col { grid-template-columns: 1fr 1fr; gap: 3rem; } }
.two-col .img-wrap { border-radius: 1rem; overflow: hidden; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.2); }
.two-col .img-wrap img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 1; }
.two-col.reverse .text { order: 2; }
.two-col.reverse .img-wrap { order: 1; }
.two-col .tag { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.5rem 1rem; border-radius: 9999px; font-size: 0.875rem; font-weight: 600; margin-bottom: 1.5rem; }
.two-col h2 { font-size: 1.875rem; font-weight: 700; color: #111; margin-bottom: 1rem; }
@media (min-width: 640px) { .two-col h2 { font-size: 2.25rem; } }
.two-col .desc { color: #4b5563; font-size: 1.125rem; margin-bottom: 2rem; line-height: 1.75; }
.feature-list { display: grid; gap: 0.75rem; margin-bottom: 2rem; }
@media (min-width: 640px) { .feature-list { grid-template-columns: repeat(2, 1fr); } }
.feature-list span { display: flex; align-items: flex-start; gap: 0.75rem; color: #374151; }
.feature-list .check { color: #22c55e; flex-shrink: 0; }
.btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1.5rem; font-weight: 600; border-radius: 0.5rem; }
.btn-blue { background: #2563eb; color: #fff; }
.btn-blue:hover { background: #1d4ed8; }
.btn-green { background: #16a34a; color: #fff; }
.btn-purple { background: #9333ea; color: #fff; }
.btn-indigo { background: #4f46e5; color: #fff; }
.btn-orange { background: #ea580c; color: #fff; }
.btn-pink { background: #db2777; color: #fff; }

/* 关于我们 - 正文缩进 */
.about-content p { font-size: 1.125rem; color: #374151; margin-bottom: 1.5rem; line-height: 1.75; text-indent: 2em; }
.about-content strong { color: #111; }
.about-content .highlight { color: #2563eb; }

/* 联系页 */
.contact-grid { display: grid; gap: 2rem; }
@media (min-width: 1024px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.contact-card { background: #fff; border-radius: 1rem; padding: 2rem; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); }
.contact-card h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; }
.contact-card a.email-btn { display: block; text-align: center; padding: 0.75rem; background: linear-gradient(to right, #2563eb, #06b6d4); color: #fff; font-weight: 600; border-radius: 0.5rem; margin-top: 1rem; }
.wechat-box { text-align: center; padding: 1rem; border: 1px solid #e5e7eb; border-radius: 0.5rem; margin-top: 1rem; }
.wechat-box .qrcode { width: 14rem; height: 14rem; margin: 0 auto 0.5rem; }
.wechat-box .qrcode img { width: 100%; height: 100%; object-fit: contain; }
.hours-card { background: linear-gradient(135deg, #2563eb, #06b6d4); color: #fff; padding: 2rem; border-radius: 1rem; }
.hours-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 1rem; }
.hours-card p { opacity: 0.9; font-size: 0.9375rem; margin-bottom: 0.5rem; }

/* 技术栈 */
.tech-grid { display: grid; gap: 1.5rem; }
@media (min-width: 640px) { .tech-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 768px) { .tech-grid { grid-template-columns: repeat(3, 1fr); } }
.tech-item { padding: 1.5rem; background: linear-gradient(135deg, #f9fafb, #fff); border: 1px solid #e5e7eb; border-radius: 0.75rem; }
.tech-item:hover { border-color: #93c5fd; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05); }
.tech-item h3 { font-size: 1.125rem; font-weight: 700; color: #111; margin-bottom: 0.25rem; }
.tech-item p { font-size: 0.875rem; color: #4b5563; }

/* Footer */
.site-footer { background: #111827; color: #fff; padding: 3rem 0 1.5rem; }
.site-footer .container { max-width: 1280px; margin: 0 auto; padding: 0 1rem; }
.site-footer .grid { display: grid; gap: 2rem; margin-bottom: 2rem; }
@media (min-width: 768px) { .site-footer .grid { grid-template-columns: 2fr 1fr 1fr; } }
.site-footer h3 { font-size: 1.5rem; font-weight: 700; background: linear-gradient(to right, #60a5fa, #22d3ee); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 1rem; }
.site-footer p, .site-footer li { color: #9ca3af; font-size: 0.9375rem; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { margin-bottom: 0.5rem; }
.site-footer .copy { border-top: 1px solid #1f2937; padding-top: 2rem; text-align: center; }
.site-footer .copy p { margin: 0.25rem 0; font-size: 0.875rem; color: #6b7280; }
.site-footer .copy a { color: #6b7280; }
.site-footer .copy a:hover { color: #9ca3af; }

/* 返回顶部 */
.back-top { position: fixed; bottom: 2rem; right: 2rem; z-index: 50; width: 3.5rem; height: 3.5rem; border-radius: 9999px; background: linear-gradient(135deg, #2563eb, #06b6d4); color: #fff; border: none; cursor: pointer; display: none; align-items: center; justify-content: center; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.2); }
.back-top.show { display: flex; }
.back-top:hover { transform: scale(1.05); }
.back-top svg { width: 1.5rem; height: 1.5rem; }