:root {
    --bg: #F4FBFF;
    --surface-soft: #E8F7FF;
    --surface: #FFFFFF;
    --primary: #11AEEA;
    --primary-strong: #1688D8;
    --deep-blue: #155A9D;
    --text: #24384A;
    --muted: #60758A;
    --border: rgba(17,174,234,.18);
    --footer: #073A68;
    --footer-text: #EAF8FF;
    --gradient: linear-gradient(135deg, #35D7FF 0%, #1688D8 100%);
    --shadow: 0 18px 45px rgba(21,90,157,.12);
    --shadow-soft: 0 10px 30px rgba(21,90,157,.08);
    --radius: 24px;
    --header-h: 78px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 0;
    overflow-x: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.72;
    text-rendering: optimizeLegibility;
}
body.drawer-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 9999; padding: 10px 16px; background: #fff; color: var(--deep-blue); border-radius: 10px; box-shadow: var(--shadow-soft); }
.skip-link:focus { top: 12px; }
.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1000;
    background: rgba(255,255,255,.96);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(18px);
    transition: box-shadow .25s ease;
}
.site-header.scrolled { box-shadow: 0 9px 28px rgba(21,90,157,.12); }
.header-inner {
    width: min(100% - 32px, 1360px);
    min-height: var(--header-h);
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: clamp(12px, 1.5vw, 24px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; color: var(--deep-blue); }
.brand img { width: 48px; height: 48px; object-fit: contain; }
.brand span { display: grid; line-height: 1.1; }
.brand strong { font-size: 21px; letter-spacing: .12em; }
.brand small { margin-top: 4px; font-size: 10px; letter-spacing: .18em; color: var(--primary-strong); }
.desktop-nav {
    flex: 1;
    min-width: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: clamp(8px, 1.1vw, 18px);
    white-space: nowrap;
}
.desktop-nav a { position: relative; padding: 9px 0; color: var(--muted); font-size: clamp(13px, .95vw, 15px); font-weight: 600; }
.desktop-nav a::after { content: ""; position: absolute; left: 50%; right: 50%; bottom: 2px; height: 2px; background: var(--gradient); border-radius: 99px; transition: .2s ease; }
.desktop-nav a:hover, .desktop-nav a.active { color: var(--primary-strong); }
.desktop-nav a:hover::after, .desktop-nav a.active::after { left: 0; right: 0; }
.header-actions { flex: 0 0 auto; display: flex; align-items: center; gap: 10px; }
.main-btn, .secondary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 24px;
    border-radius: 999px;
    font-weight: 700;
    transition: transform .2s ease, box-shadow .2s ease;
}
.main-btn { color: #fff; background: var(--gradient); box-shadow: 0 10px 24px rgba(22,136,216,.24); }
.secondary-btn { color: var(--primary-strong); background: #fff; border: 1px solid var(--border); }
.main-btn:hover, .secondary-btn:hover { transform: translateY(-2px); }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 10px; border: 1px solid var(--border); border-radius: 14px; background: #fff; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--deep-blue); border-radius: 9px; }
.drawer-backdrop { position: fixed; inset: 0; z-index: 1090; background: rgba(7,58,104,.42); backdrop-filter: blur(3px); }
.mobile-drawer { position: fixed; inset: 0 0 0 auto; z-index: 1100; width: min(88vw, 380px); padding: 18px; background: #fff; transform: translateX(105%); transition: transform .28s ease; box-shadow: -18px 0 45px rgba(7,58,104,.16); overflow-y: auto; }
.mobile-drawer.open { transform: translateX(0); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-bottom: 15px; border-bottom: 1px solid var(--border); }
.drawer-close { width: 42px; height: 42px; border: 0; border-radius: 13px; background: var(--surface-soft); color: var(--deep-blue); font-size: 28px; line-height: 1; }
.mobile-nav { display: grid; gap: 6px; padding: 18px 0; }
.mobile-nav a { padding: 12px 14px; border-radius: 13px; color: var(--text); font-weight: 650; }
.mobile-nav a:hover, .mobile-nav a.active { color: var(--primary-strong); background: var(--surface-soft); }
.drawer-main-btn { width: 100%; }
main { min-height: 70vh; padding-top: var(--header-h); }
.container { width: min(100% - 32px, 1180px); margin-inline: auto; }
.wide-container { width: min(100% - 32px, 1360px); margin-inline: auto; }
.section { padding: clamp(56px, 8vw, 96px) 0; }
.section-tight { padding: clamp(38px, 6vw, 68px) 0; }
.section-soft { background: linear-gradient(180deg, rgba(232,247,255,.75), rgba(244,251,255,.6)); }
.section-head { max-width: 760px; margin: 0 auto 34px; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 10px; color: var(--primary-strong); font-size: 13px; font-weight: 800; letter-spacing: .12em; }
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--gradient); border-radius: 99px; }
h1, h2, h3 { margin-top: 0; color: var(--deep-blue); line-height: 1.3; }
h1 { font-size: clamp(34px, 5vw, 60px); letter-spacing: -.035em; }
h2 { font-size: clamp(26px, 3vw, 40px); }
h3 { font-size: 20px; }
p { margin: 0 0 1em; }
.lead { font-size: clamp(17px, 2vw, 21px); color: var(--muted); }
.muted { color: var(--muted); }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--primary-strong); font-weight: 750; }
.text-link::after { content: "→"; transition: transform .2s ease; }
.text-link:hover::after { transform: translateX(4px); }
.hero { padding: clamp(52px, 7vw, 86px) 0; background: radial-gradient(circle at 80% 10%, rgba(53,215,255,.22), transparent 33%), linear-gradient(180deg, #fff, var(--bg)); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr); align-items: center; gap: clamp(28px, 6vw, 72px); }
.hero-copy .lead { max-width: 680px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-media, .content-media { padding: 14px; background: rgba(255,255,255,.78); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-media img, .content-media img { width: 100%; max-height: 480px; object-fit: contain; border-radius: calc(var(--radius) - 10px); background: var(--surface-soft); }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; color: var(--muted); font-size: 14px; }
.breadcrumb a { color: var(--primary-strong); }
.carousel-wrap { padding: 24px 0 0; }
.carousel { position: relative; width: min(100% - 32px, 1360px); margin-inline: auto; overflow: hidden; border-radius: clamp(18px, 3vw, 32px); background: var(--surface-soft); box-shadow: var(--shadow); border: 1px solid var(--border); }
.carousel-track { display: flex; transition: transform .55s cubic-bezier(.22,.61,.36,1); }
.carousel-slide { min-width: 100%; aspect-ratio: 16 / 6.1; display: grid; place-items: center; background: var(--surface-soft); }
.carousel-slide img { width: 100%; height: 100%; object-fit: contain; }
.carousel-arrow { position: absolute; top: 50%; z-index: 3; width: 46px; height: 46px; margin-top: -23px; border: 1px solid rgba(255,255,255,.65); border-radius: 50%; color: var(--deep-blue); background: rgba(255,255,255,.86); box-shadow: 0 8px 24px rgba(7,58,104,.13); font-size: 24px; }
.carousel-arrow.prev { left: 18px; }
.carousel-arrow.next { right: 18px; }
.carousel-dots { position: absolute; z-index: 3; left: 50%; bottom: 16px; display: flex; gap: 8px; transform: translateX(-50%); }
.carousel-dot { width: 10px; height: 10px; padding: 0; border: 0; border-radius: 50%; background: rgba(255,255,255,.68); box-shadow: 0 0 0 1px rgba(21,90,157,.18); }
.carousel-dot.active { width: 28px; border-radius: 99px; background: var(--primary); }
.intro-panel { width: min(100% - 32px, 1180px); margin: 30px auto 0; padding: clamp(28px, 5vw, 52px); display: grid; grid-template-columns: 1.2fr .8fr; gap: 30px; align-items: center; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-soft); }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stat { padding: 20px 14px; text-align: center; border-radius: 18px; background: var(--surface-soft); }
.stat strong { display: block; margin-bottom: 4px; color: var(--primary-strong); font-size: 24px; }
.grid-2, .grid-3, .grid-4, .quick-grid, .review-grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.quick-grid { grid-template-columns: repeat(5, minmax(0,1fr)); }
.review-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.card { min-width: 0; padding: 24px; background: var(--surface); border: 1px solid var(--border); border-radius: 20px; box-shadow: var(--shadow-soft); }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); transition: .25s ease; }
.card h3 { margin-bottom: 10px; }
.card p:last-child { margin-bottom: 0; }
.card-media { overflow: hidden; padding: 0; }
.card-media img { width: 100%; aspect-ratio: 16/10; object-fit: contain; background: var(--surface-soft); border-bottom: 1px solid var(--border); }
.card-media .card-body { padding: 24px; }
.quick-card { display: flex; min-height: 190px; flex-direction: column; }
.quick-card .text-link { margin-top: auto; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, .9fr); gap: clamp(28px, 6vw, 70px); align-items: center; }
.split.reverse > :first-child { order: 2; }
.feature-list, .check-list { list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 12px; }
.feature-list li, .check-list li { position: relative; padding-left: 30px; color: var(--text); }
.feature-list li::before, .check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 22px; height: 22px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--gradient); font-size: 12px; font-weight: 800; }
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.step { counter-increment: step; padding: 26px; border-radius: 20px; background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow-soft); }
.step::before { content: counter(step, decimal-leading-zero); display: inline-grid; width: 46px; height: 46px; margin-bottom: 16px; place-items: center; border-radius: 14px; color: #fff; background: var(--gradient); font-weight: 800; }
.notice { padding: clamp(26px, 4vw, 42px); border: 1px solid var(--border); border-radius: var(--radius); background: linear-gradient(135deg, rgba(232,247,255,.95), #fff); box-shadow: var(--shadow-soft); }
.notice h2 { margin-bottom: 14px; }
.review { position: relative; }
.review::before { content: "“"; position: absolute; right: 18px; top: 2px; color: rgba(17,174,234,.14); font-size: 72px; font-family: Georgia, serif; line-height: 1; }
.review strong { display: block; margin-top: 18px; color: var(--primary-strong); }
.tag { display: inline-flex; padding: 5px 10px; border-radius: 999px; color: var(--primary-strong); background: var(--surface-soft); font-size: 12px; font-weight: 800; }
.faq-list { display: grid; gap: 12px; }
details { border: 1px solid var(--border); border-radius: 16px; background: #fff; box-shadow: var(--shadow-soft); }
summary { position: relative; padding: 20px 52px 20px 22px; list-style: none; color: var(--deep-blue); font-weight: 800; cursor: pointer; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); color: var(--primary-strong); font-size: 24px; }
details[open] summary::after { content: "−"; }
details p { padding: 0 22px 22px; color: var(--muted); }
.pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.pill { padding: 8px 13px; border-radius: 999px; color: var(--deep-blue); background: var(--surface-soft); font-weight: 700; font-size: 14px; }
.site-footer { padding: 64px 0 0; background: var(--footer); color: var(--footer-text); }
.footer-grid { width: min(100% - 32px, 1180px); margin-inline: auto; display: grid; grid-template-columns: 1.55fr .75fr .75fr 1fr; gap: 34px; }
.site-footer h2 { color: #fff; font-size: 17px; }
.site-footer a:not(.brand) { display: block; width: fit-content; margin: 8px 0; color: rgba(234,248,255,.82); }
.site-footer a:hover { color: #fff; }
.footer-brand p, .site-footer p { color: rgba(234,248,255,.78); }
.brand-light { color: #fff; margin-bottom: 16px; }
.brand-light small { color: #82E5FF; }
.footer-bottom { width: min(100% - 32px, 1180px); margin: 42px auto 0; padding: 22px 0; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid rgba(234,248,255,.16); color: rgba(234,248,255,.7); font-size: 13px; }
@media (max-width: 1180px) {
    .desktop-nav { display: none; }
    .menu-toggle { display: block; }
    .header-inner { justify-content: space-between; }
    .quick-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
    .grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 900px) {
    .hero-grid, .split, .intro-panel { grid-template-columns: 1fr; }
    .split.reverse > :first-child { order: initial; }
    .grid-3, .review-grid, .steps { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .footer-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .carousel-slide { aspect-ratio: 16 / 8; }
}
@media (max-width: 680px) {
    :root { --header-h: 70px; }
    .header-inner, .container, .wide-container, .carousel, .intro-panel, .footer-grid, .footer-bottom { width: min(100% - 24px, 1180px); }
    .brand img { width: 42px; height: 42px; }
    .brand strong { font-size: 18px; }
    .brand small { display: none; }
    .header-actions .main-btn { min-height: 40px; padding: 0 17px; }
    .menu-toggle { width: 40px; height: 40px; }
    .carousel-wrap { padding-top: 14px; }
    .carousel { border-radius: 16px; }
    .carousel-slide { aspect-ratio: 16 / 10; }
    .carousel-arrow { width: 38px; height: 38px; margin-top: -19px; font-size: 20px; }
    .carousel-arrow.prev { left: 10px; }
    .carousel-arrow.next { right: 10px; }
    .carousel-dots { bottom: 10px; }
    .intro-panel { margin-top: 18px; }
    .stats { grid-template-columns: 1fr; }
    .grid-2, .grid-3, .grid-4, .quick-grid, .review-grid, .steps { grid-template-columns: 1fr; }
    .quick-card { min-height: auto; }
    .hero { padding-top: 42px; }
    .hero-media, .content-media { padding: 9px; }
    .section { padding: 56px 0; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}