:root {
--black: #000;
--gray-900: #111;
--gray-700: #333;
--gray-500: #666;
--gray-400: #888;
--gray-300: #bbb;
--gray-200: #e5e5e5;
--gray-100: #f5f5f7;
--white: #fff;
--blue: #06c;
--header-h: 56px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
font-size: 17px;
line-height: 1.6;
color: var(--gray-900);
background: var(--white);
-webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--blue); text-decoration: none; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 680px; margin: 0 auto; padding: 0 24px; }
.container-lg { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.header {
position: fixed; top: 0; left: 0; right: 0;
height: var(--header-h);
background: rgba(255,255,255,.92);
backdrop-filter: blur(20px);
border-bottom: 1px solid var(--gray-200);
z-index: 1000;
}

.header-inner {
max-width: 1080px; margin: 0 auto; padding: 0 24px;
height: 100%; display: flex; align-items: center; justify-content: space-between;
}

.logo { display: flex; align-items: center; gap: 8px; font-size: 17px; font-weight: 600; color: var(--black); }
.logo img { width: 32px; height: 32px; }

.nav { display: flex; gap: 28px; }
.nav a { font-size: 14px; color: var(--gray-700); }
.nav a:hover { color: var(--black); }

.btn-header {
padding: 8px 16px; font-size: 14px; font-weight: 500;
color: var(--white); background: var(--black);
border: none; border-radius: 20px; cursor: pointer;
}
.btn-header:hover { background: var(--gray-700); }

.menu-btn { display: none; padding: 8px; background: none; border: none; cursor: pointer; color: var(--black); }

.mobile-nav {
display: none; position: fixed; top: var(--header-h); left: 0; right: 0;
background: var(--white); border-bottom: 1px solid var(--gray-200);
padding: 20px 24px; flex-direction: column; gap: 12px;
transform: translateY(-100%); opacity: 0; transition: .2s; z-index: 999;
}
.mobile-nav.active { transform: translateY(0); opacity: 1; }
.mobile-nav a { font-size: 16px; color: var(--gray-700); padding: 10px 0; border-bottom: 1px solid var(--gray-200); }

.btn-primary {
display: inline-flex; align-items: center; justify-content: center;
padding: 14px 28px; font-size: 17px; font-weight: 500;
color: var(--white); background: var(--black);
border: none; border-radius: 24px; cursor: pointer;
}
.btn-primary:hover { background: var(--gray-700); }
.btn-lg { padding: 18px 36px; font-size: 18px; }

.btn-white { color: var(--black); background: var(--white); }
.btn-white:hover { background: var(--gray-100); }

.btn-text { font-size: 17px; font-weight: 500; color: var(--blue); }

.hero { padding: 120px 0 40px; text-align: center; }
.hero-tag { font-size: 13px; font-weight: 600; color: var(--gray-500); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 12px; }
.hero h1 { font-size: clamp(44px, 9vw, 72px); font-weight: 700; line-height: 1.05; letter-spacing: -.03em; margin-bottom: 20px; }
.hero-desc { font-size: 20px; color: var(--gray-500); margin-bottom: 32px; }
.hero-actions { display: flex; align-items: center; justify-content: center; gap: 20px; flex-wrap: wrap; }

.hero-banner { padding: 0 0 60px; text-align: center; }
.hero-banner img { border-radius: 16px; box-shadow: 0 20px 60px rgba(0,0,0,.1); }

.stats-bar { padding: 48px 0; border-top: 1px solid var(--gray-200); border-bottom: 1px solid var(--gray-200); }
.stats-grid { display: flex; justify-content: center; gap: 64px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-item strong { display: block; font-size: 40px; font-weight: 700; letter-spacing: -.02em; }
.stat-item span { font-size: 14px; color: var(--gray-500); }

.section { padding: 80px 0; }
.bg-gray { background: var(--gray-100); }

.label { font-size: 12px; font-weight: 600; color: var(--blue); text-transform: uppercase; letter-spacing: .15em; margin-bottom: 8px; }
.section h2, h2 { font-size: clamp(28px, 5vw, 44px); font-weight: 700; letter-spacing: -.02em; margin-bottom: 24px; }
.sub-text { font-size: 18px; color: var(--gray-500); margin-bottom: 40px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.col-text p { font-size: 18px; color: var(--gray-700); margin-bottom: 16px; }
.col-text strong { color: var(--black); }
.col-img img { border-radius: 20px; }

.full-banner { width: 100%; overflow: hidden; }
.full-banner img { width: 100%; height: auto; object-fit: cover; }

.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-box { text-align: center; padding: 32px 20px; background: var(--white); border-radius: 16px; }
.feature-box img { width: 160px; height: 160px; margin: 0 auto 20px; object-fit: contain; }
.feature-box h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.feature-box p { font-size: 15px; color: var(--gray-500); }

.highlight-section { padding: 80px 0; background: var(--gray-100); }
.highlight-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.highlight-img img { border-radius: 16px; }
.highlight-text h3 { font-size: 32px; font-weight: 700; margin-bottom: 16px; }
.highlight-text p { font-size: 17px; color: var(--gray-500); margin-bottom: 24px; line-height: 1.7; }

.download-flex { display: grid; grid-template-columns: 1fr 300px; gap: 48px; align-items: start; }
.dl-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-bottom: 24px; }
.dl-card {
padding: 28px 20px; text-align: center;
background: var(--white); border: 1px solid var(--gray-200); border-radius: 14px;
cursor: pointer; transition: .2s;
}
.dl-card:hover { border-color: var(--black); }
.dl-icon { font-size: 28px; display: block; margin-bottom: 12px; }
.dl-card strong { display: block; font-size: 17px; margin-bottom: 4px; }
.dl-card span { font-size: 13px; color: var(--gray-500); }

.dl-tip { padding: 16px 20px; background: var(--gray-100); border-radius: 10px; font-size: 14px; color: var(--gray-700); }
.dl-tip strong { color: var(--black); }

.download-right { position: sticky; top: calc(var(--header-h) + 24px); }
.phone-mock { background: linear-gradient(180deg, #2d2d3a 0%, #1a1a25 100%); border-radius: 32px; padding: 10px; }
.phone-mock img { border-radius: 24px; }

.guide-list { display: flex; flex-direction: column; gap: 0; }
.guide-row { display: grid; grid-template-columns: 60px 1fr 180px; gap: 24px; padding: 40px 0; border-bottom: 1px solid var(--gray-300); align-items: center; }
.guide-row:first-child { border-top: 1px solid var(--gray-300); }
.guide-num { font-size: 14px; font-weight: 600; color: var(--gray-400); }
.guide-body h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.guide-body p { font-size: 16px; color: var(--gray-500); }
.guide-img img { border-radius: 12px; box-shadow: 0 4px 20px rgba(0,0,0,.08); }

.app-scroll { padding: 60px 0; background: var(--white); }
.app-scroll h3 { text-align: center; font-size: 20px; margin-bottom: 32px; }
.scroll-wrap { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; }
.scroll-item { text-align: center; }
.scroll-item img { border-radius: 14px; box-shadow: 0 4px 16px rgba(0,0,0,.08); margin-bottom: 10px; }
.scroll-item span { font-size: 13px; color: var(--gray-500); }

.security-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.sec-card { text-align: center; padding: 32px 24px; }
.sec-card img { width: 140px; height: 140px; margin: 0 auto 20px; object-fit: contain; }
.sec-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.sec-card p { font-size: 15px; color: var(--gray-500); line-height: 1.7; }

.network-bar { padding: 80px 0; text-align: center; background: var(--gray-100); }
.network-img { margin-bottom: 32px; }
.network-img img { border-radius: 16px; margin: 0 auto; }
.network-tags { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.network-tags span { padding: 10px 20px; background: var(--white); border-radius: 20px; font-size: 14px; color: var(--gray-700); }

.faq-list { display: flex; flex-direction: column; }
.faq-item { border-bottom: 1px solid var(--gray-300); }
.faq-item:first-child { border-top: 1px solid var(--gray-300); }
.faq-q {
width: 100%; padding: 20px 0; font-size: 16px; font-weight: 500;
color: var(--black); background: none; border: none; text-align: left;
cursor: pointer; display: flex; justify-content: space-between; align-items: center;
}
.faq-q::after { content: "+"; font-size: 22px; font-weight: 300; color: var(--gray-400); transition: .2s; }
.faq-item.active .faq-q::after { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s; }
.faq-item.active .faq-a { max-height: 200px; }
.faq-a p { padding-bottom: 20px; font-size: 15px; color: var(--gray-500); line-height: 1.7; }

.cta-section { padding: 80px 0; background: var(--black); color: var(--white); }
.cta-flex { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.cta-text h2 { color: var(--white); margin-bottom: 12px; }
.cta-text p { font-size: 18px; color: var(--gray-400); margin-bottom: 28px; }
.cta-img img { border-radius: 16px; }

.about-bar { padding: 48px 0; text-align: center; border-top: 1px solid var(--gray-200); }
.about-bar h3 { font-size: 13px; font-weight: 600; color: var(--gray-400); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 12px; }
.about-bar p { font-size: 14px; color: var(--gray-500); }

.footer { padding: 40px 0; background: var(--gray-100); border-top: 1px solid var(--gray-200); }
.footer-flex { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 24px; margin-bottom: 24px; }
.footer-logo { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 500; color: var(--gray-700); }
.footer-logo img { width: 28px; height: 28px; }
.footer-nav { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-nav a { font-size: 13px; color: var(--gray-500); }
.footer-nav a:hover { color: var(--black); }
.footer-copy { font-size: 12px; color: var(--gray-400); text-align: center; }

.back-top {
position: fixed; bottom: 32px; right: 32px;
width: 44px; height: 44px; font-size: 18px;
color: var(--gray-500); background: var(--white);
border: 1px solid var(--gray-200); border-radius: 50%;
cursor: pointer; opacity: 0; visibility: hidden; transition: .2s; z-index: 900;
}
.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { color: var(--black); border-color: var(--black); }

@media (max-width: 1024px) {
.feature-grid { grid-template-columns: repeat(2, 1fr); }
.highlight-grid { grid-template-columns: 1fr; }
.highlight-img { order: -1; }
.download-flex { grid-template-columns: 1fr; }
.download-right { position: static; display: flex; justify-content: center; order: -1; }
.phone-mock { max-width: 260px; }
.guide-row { grid-template-columns: 50px 1fr 140px; }
.security-row { grid-template-columns: 1fr; gap: 24px; }
.cta-flex { grid-template-columns: 1fr; text-align: center; }
.cta-img { display: none; }
}

@media (max-width: 768px) {
.nav, .btn-header { display: none; }
.menu-btn { display: block; }
.mobile-nav { display: flex; }

.hero { padding: 100px 0 32px; }
.hero h1 { font-size: 36px; }
.hero-desc { font-size: 17px; }
.hero-actions { flex-direction: column; gap: 12px; }

.hero-banner { padding-bottom: 40px; }
.hero-banner img { border-radius: 12px; }

.stats-grid { gap: 32px; }
.stat-item strong { font-size: 32px; }

.section { padding: 60px 0; }
.section h2, h2 { font-size: 26px; }

.two-col { grid-template-columns: 1fr; gap: 32px; }
.col-img { order: -1; text-align: center; }
.col-img img { max-width: 280px; margin: 0 auto; }

.feature-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
.feature-box { padding: 24px 16px; }
.feature-box img { width: 100px; height: 100px; }
.feature-box h3 { font-size: 16px; }
.feature-box p { font-size: 14px; }

.highlight-section { padding: 60px 0; }
.highlight-text h3 { font-size: 24px; }

.dl-cards { grid-template-columns: 1fr 1fr; }
.dl-card { padding: 20px 16px; }

.guide-row { grid-template-columns: 1fr; gap: 16px; text-align: center; }
.guide-num { font-size: 24px; color: var(--gray-300); }
.guide-img img { max-width: 140px; margin: 0 auto; }

.scroll-wrap { gap: 12px; }
.scroll-item img { width: 100px; height: auto; }

.sec-card { padding: 24px 16px; }
.sec-card img { width: 100px; height: 100px; }

.network-bar { padding: 60px 0; }
.network-tags { gap: 10px; }
.network-tags span { padding: 8px 14px; font-size: 13px; }

.faq-q { font-size: 15px; }

.footer-flex { flex-direction: column; text-align: center; }
.footer-nav { justify-content: center; }
}

@media (max-width: 480px) {
.container, .container-sm, .container-lg { padding: 0 16px; }
.hero h1 { font-size: 30px; }
.stats-grid { flex-direction: column; gap: 20px; }
.feature-grid { grid-template-columns: 1fr; }
.dl-cards { grid-template-columns: 1fr; }
.scroll-wrap { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 16px; }
.scroll-item { flex-shrink: 0; }
.network-tags { flex-direction: column; align-items: center; }
}

/* 法律条款样式 */
.footer-legal { display: flex; flex-direction: column; gap: 8px; }
.footer-legal strong { font-size: 13px; color: var(--gray-400); margin-bottom: 4px; }
.footer-legal a { font-size: 13px; color: var(--gray-500); }
.footer-legal a:hover { color: var(--black); }

@media (max-width: 768px) {
.footer-legal { align-items: center; margin-top: 16px; }
}

/* 法律页面内容样式 */
.legal-content h3 { font-size: 18px; font-weight: 600; margin: 32px 0 12px; color: var(--gray-900); }
.legal-content p { font-size: 16px; color: var(--gray-700); margin-bottom: 16px; line-height: 1.8; }