:root {
    --bg: #F4FBFF;
    --surface: #FFFFFF;
    --soft: #E8F7FF;
    --primary: #11AEEA;
    --accent: #1688D8;
    --deep: #155A9D;
    --text: #24384A;
    --muted: #60758A;
    --line: rgba(17, 174, 234, 0.18);
    --footer: #073A68;
    --footer-text: #EAF8FF;
    --shadow: 0 18px 48px rgba(12, 104, 164, 0.12);
    --shadow-soft: 0 10px 30px rgba(12, 104, 164, 0.08);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
    --header-height: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    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: 1.75;
    -webkit-font-smoothing: antialiased;
}
body.drawer-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; }
.skip-link {
    position: fixed;
    left: 16px;
    top: -80px;
    z-index: 3000;
    padding: 10px 16px;
    border-radius: 10px;
    background: var(--footer);
    color: #fff;
    transition: top .2s ease;
}
.skip-link:focus { top: 12px; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255, 255, 255, .96);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 8px 28px rgba(12, 104, 164, .07);
    backdrop-filter: blur(16px);
}
.header-inner {
    width: min(100% - 32px, 1360px);
    height: 100%;
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: clamp(10px, 1vw, 18px);
}
.brand-logo { flex: 0 0 auto; width: clamp(108px, 9.2vw, 132px); }
.brand-logo img { width: 100%; height: 44px; object-fit: contain; }
.desktop-nav {
    min-width: 0;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(4px, .55vw, 10px);
    overflow: hidden;
}
.desktop-nav a {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 8px clamp(5px, .5vw, 9px);
    border-radius: 999px;
    color: var(--deep);
    font-size: clamp(12px, .92vw, 14px);
    font-weight: 650;
    transition: .2s ease;
}
.desktop-nav a:hover,
.desktop-nav a.active { background: var(--soft); color: var(--accent); }
.header-actions { flex: 0 0 auto; display: flex; align-items: center; gap: 10px; }
.main-btn {
    display: inline-flex;
    min-width: 82px;
    min-height: 42px;
    align-items: center;
    justify-content: center;
    padding: 10px 22px;
    border: 0;
    border-radius: 999px;
    color: #fff;
    background: linear-gradient(135deg, #35D7FF 0%, #1688D8 100%);
    box-shadow: 0 10px 24px rgba(22, 136, 216, .22);
    font-weight: 750;
    white-space: nowrap;
    transition: transform .2s ease, box-shadow .2s ease;
}
.main-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(22, 136, 216, .28); }
.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: #fff;
    cursor: pointer;
}
.menu-toggle span { width: 20px; height: 2px; border-radius: 2px; background: var(--deep); }

.drawer-backdrop { position: fixed; inset: 0; z-index: 1190; background: rgba(7, 58, 104, .42); }
.mobile-drawer {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1200;
    width: min(88vw, 380px);
    height: 100dvh;
    padding: 22px;
    overflow-y: auto;
    background: #fff;
    box-shadow: -20px 0 50px rgba(7, 58, 104, .18);
    transform: translateX(105%);
    visibility: hidden;
    transition: transform .25s ease, visibility .25s ease;
}
.mobile-drawer.open { transform: translateX(0); visibility: visible; }
.drawer-head { display: flex; align-items: center; justify-content: space-between; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.drawer-brand { color: var(--primary); font-size: 30px; font-weight: 900; letter-spacing: .08em; }
.drawer-close { width: 42px; height: 42px; border: 0; border-radius: 12px; background: var(--soft); color: var(--deep); font-size: 28px; cursor: pointer; }
.drawer-nav { display: grid; gap: 6px; padding: 18px 0; }
.drawer-nav a { padding: 11px 14px; border-radius: 12px; color: var(--deep); font-weight: 650; }
.drawer-nav a:hover, .drawer-nav a.active { background: var(--soft); color: var(--accent); }
.drawer-register { width: 100%; }

.page-shell { width: min(100% - 32px, 1240px); margin-inline: auto; }
main { min-height: 60vh; }
.section { padding: clamp(48px, 7vw, 86px) 0; }
.section.compact { padding: clamp(34px, 5vw, 60px) 0; }
.section.soft { background: linear-gradient(180deg, rgba(232, 247, 255, .72), rgba(244, 251, 255, .1)); }
.section-head { max-width: 780px; margin-bottom: 28px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 10px; color: var(--accent); font-weight: 800; letter-spacing: .08em; }
.eyebrow::before { content: ""; width: 28px; height: 3px; border-radius: 999px; background: linear-gradient(90deg, #35D7FF, #1688D8); }
h1, h2, h3 { margin: 0 0 14px; color: var(--deep); line-height: 1.3; }
h1 { font-size: clamp(32px, 5vw, 58px); }
h2 { font-size: clamp(26px, 3.5vw, 40px); }
h3 { font-size: clamp(19px, 2vw, 24px); }
p { margin: 0 0 14px; }
.lead { max-width: 820px; color: var(--muted); font-size: clamp(16px, 1.6vw, 19px); }
.text-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 8px; color: var(--accent); font-weight: 750; }
.text-link::after { content: "→"; transition: transform .2s ease; }
.text-link:hover::after { transform: translateX(4px); }

.hero-page { padding: clamp(52px, 8vw, 96px) 0 44px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr); gap: clamp(30px, 5vw, 70px); align-items: center; }
.hero-copy { padding: 12px 0; }
.hero-copy .lead { margin-bottom: 24px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.secondary-btn { display: inline-flex; min-height: 42px; align-items: center; justify-content: center; padding: 10px 20px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--deep); font-weight: 750; }
.hero-media { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-xl); background: #fff; box-shadow: var(--shadow); }
.hero-media img { width: 100%; max-height: 480px; object-fit: contain; }

.carousel-wrap { padding: 24px 0 0; }
.carousel {
    position: relative;
    width: min(100% - 32px, 1360px);
    margin-inline: auto;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: clamp(18px, 3vw, 30px);
    background: #eaf8ff;
    box-shadow: var(--shadow);
    aspect-ratio: 16 / 6.1;
}
.carousel-track { display: flex; height: 100%; transition: transform .55s cubic-bezier(.22,.61,.36,1); }
.carousel-slide { flex: 0 0 100%; min-width: 100%; height: 100%; }
.carousel-slide img { width: 100%; height: 100%; object-fit: contain; }
.carousel-arrow {
    position: absolute;
    top: 50%;
    z-index: 3;
    width: clamp(40px, 5vw, 54px);
    height: clamp(40px, 5vw, 54px);
    transform: translateY(-50%);
    border: 1px solid rgba(255,255,255,.72);
    border-radius: 50%;
    background: rgba(7, 58, 104, .46);
    color: #fff;
    font-size: 25px;
    cursor: pointer;
    backdrop-filter: blur(8px);
}
.carousel-arrow:hover { background: rgba(7, 58, 104, .68); }
.carousel-prev { left: clamp(10px, 2vw, 26px); }
.carousel-next { right: clamp(10px, 2vw, 26px); }
.carousel-dots { position: absolute; left: 50%; bottom: 16px; z-index: 3; 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,.7); box-shadow: 0 2px 10px rgba(7,58,104,.2); cursor: pointer; }
.carousel-dot.active { width: 28px; border-radius: 999px; background: #fff; }

.intro-panel { padding: 34px; border: 1px solid var(--line); border-radius: var(--radius-xl); background: linear-gradient(135deg, #fff, #edfaff); box-shadow: var(--shadow-soft); }
.intro-panel h1 { max-width: 900px; }
.intro-panel .lead { max-width: 940px; }

.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.card-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card {
    min-width: 0;
    padding: clamp(22px, 3vw, 30px);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: #fff;
    box-shadow: var(--shadow-soft);
    transition: transform .22s ease, box-shadow .22s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card p { color: var(--muted); }
.card .tag { display: inline-flex; margin-bottom: 14px; padding: 5px 10px; border-radius: 999px; background: var(--soft); color: var(--accent); font-size: 13px; font-weight: 800; }
.media-card { overflow: hidden; padding: 0; }
.media-card img { width: 100%; aspect-ratio: 16/9; object-fit: contain; background: #eefaff; }
.media-card .card-body { padding: 24px; }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 64px); align-items: center; }
.split.reverse .split-media { order: 2; }
.split-media { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-xl); background: #fff; box-shadow: var(--shadow); }
.split-media img { width: 100%; max-height: 520px; object-fit: contain; }
.split-copy .lead { margin-bottom: 18px; }
.feature-list { display: grid; gap: 13px; margin-top: 20px; }
.feature-item { display: grid; grid-template-columns: 34px minmax(0,1fr); gap: 12px; align-items: start; }
.feature-item b { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 10px; background: var(--soft); color: var(--accent); }
.feature-item p { color: var(--muted); }

.notice { padding: 26px; border: 1px solid var(--line); border-left: 5px solid var(--primary); border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow-soft); }
.notice h2, .notice h3 { margin-bottom: 10px; }
.notice p { color: var(--muted); }

.steps { counter-reset: step; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.step { position: relative; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; }
.step::before { counter-increment: step; content: counter(step, decimal-leading-zero); display: inline-flex; margin-bottom: 18px; color: var(--primary); font-size: 28px; font-weight: 900; }
.step p { color: var(--muted); }

.review-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.review-card { padding: 24px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow-soft); }
.review-card p { color: var(--text); }
.review-card strong { display: block; margin-top: 16px; color: var(--accent); }
.review-card span { color: var(--muted); font-size: 14px; }

.faq-list { display: grid; gap: 14px; }
details { border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; box-shadow: var(--shadow-soft); }
summary { position: relative; padding: 20px 52px 20px 22px; color: var(--deep); font-weight: 800; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%); color: var(--accent); font-size: 24px; }
details[open] summary::after { content: "−"; }
details p { padding: 0 22px 22px; color: var(--muted); }

.contact-form { display: grid; gap: 15px; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-xl); background: #fff; box-shadow: var(--shadow-soft); }
.contact-form label { display: grid; gap: 7px; color: var(--deep); font-weight: 700; }
.contact-form input, .contact-form textarea, .contact-form select { width: 100%; border: 1px solid var(--line); border-radius: 12px; background: #fbfeff; color: var(--text); padding: 12px 14px; outline: none; }
.contact-form textarea { min-height: 130px; resize: vertical; }
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(17,174,234,.12); }

.site-footer { margin-top: 70px; background: var(--footer); color: var(--footer-text); }
.footer-inner { width: min(100% - 32px, 1240px); margin-inline: auto; display: grid; grid-template-columns: 1.1fr 1.9fr; gap: 50px; padding: 54px 0 36px; }
.footer-brand strong { display: block; margin-bottom: 12px; font-size: 34px; letter-spacing: .08em; }
.footer-brand p { max-width: 460px; color: rgba(234,248,255,.78); }
.footer-links { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 28px; }
.footer-links h2 { margin-bottom: 14px; color: #fff; font-size: 17px; }
.footer-links a { display: block; width: fit-content; margin: 8px 0; color: rgba(234,248,255,.78); }
.footer-links a:hover { color: #fff; }
.footer-notice { border-top: 1px solid rgba(234,248,255,.14); padding: 22px 16px 28px; text-align: center; }
.footer-notice p { max-width: 1040px; margin: 0 auto 8px; color: rgba(234,248,255,.7); font-size: 13px; }

@media (max-width: 1179px) {
    .desktop-nav { display: none; }
    .header-inner { justify-content: space-between; }
    .menu-toggle { display: inline-flex; }
    .header-actions .main-btn { min-width: 74px; padding-inline: 18px; }
}
@media (max-width: 980px) {
    .hero-grid, .split, .footer-inner { grid-template-columns: 1fr; }
    .split.reverse .split-media { order: 0; }
    .card-grid.four { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .card-grid, .review-grid, .steps { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .carousel { aspect-ratio: 16 / 7.6; }
}
@media (max-width: 680px) {
    :root { --header-height: 68px; }
    .header-inner, .page-shell, .carousel { width: min(100% - 22px, 1240px); }
    .brand-logo { width: 102px; }
    .brand-logo img { height: 38px; }
    .header-actions { gap: 7px; }
    .header-actions .main-btn { min-width: 66px; min-height: 40px; padding: 8px 14px; font-size: 14px; }
    .menu-toggle { width: 40px; height: 40px; }
    .carousel-wrap { padding-top: 12px; }
    .carousel { aspect-ratio: 16 / 9.4; border-radius: 18px; }
    .carousel-arrow { width: 38px; height: 38px; font-size: 21px; }
    .carousel-dots { bottom: 10px; }
    .section { padding: 46px 0; }
    .intro-panel { padding: 24px; }
    .card-grid, .card-grid.two, .card-grid.four, .review-grid, .steps { grid-template-columns: 1fr; }
    .footer-links { grid-template-columns: 1fr 1fr; }
    .footer-inner { gap: 26px; padding-top: 42px; }
}
@media (max-width: 430px) {
    .carousel { aspect-ratio: 4 / 3; }
    .carousel-slide img { object-fit: contain; }
    .hero-actions { display: grid; }
    .hero-actions > * { width: 100%; }
    .footer-links { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}