:root {
    --bg: #F4FBFF;
    --surface: #FFFFFF;
    --surface-soft: #E8F7FF;
    --primary: #10AEEA;
    --primary-strong: #1688D8;
    --text-strong: #155A9D;
    --text: #24384A;
    --muted: #60758A;
    --border: rgba(16, 174, 234, 0.18);
    --shadow: 0 18px 45px rgba(21, 90, 157, 0.10);
    --shadow-soft: 0 10px 26px rgba(21, 90, 157, 0.08);
    --radius-lg: 28px;
    --radius-md: 20px;
    --radius-sm: 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;
    text-rendering: optimizeLegibility;
}
body.drawer-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
}
.header-shell {
    width: min(100% - 32px, 1360px);
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: clamp(12px, 1.6vw, 26px);
}
.brand-logo { flex: 0 0 auto; display: inline-flex; align-items: center; }
.brand-logo img { width: clamp(132px, 12vw, 184px); height: 48px; object-fit: contain; }
.desktop-nav {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(6px, .72vw, 14px);
    white-space: nowrap;
}
.desktop-nav a {
    position: relative;
    padding: 8px clamp(3px, .32vw, 7px);
    color: #36566E;
    font-size: clamp(12px, .92vw, 14px);
    font-weight: 700;
    transition: color .2s ease;
}
.desktop-nav a::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 2px;
    width: 0;
    height: 2px;
    border-radius: 999px;
    background: var(--primary);
    transform: translateX(-50%);
    transition: width .2s ease;
}
.desktop-nav a:hover, .desktop-nav a.active { color: var(--primary-strong); }
.desktop-nav a:hover::after, .desktop-nav a.active::after { width: calc(100% - 10px); }
.header-actions { flex: 0 0 auto; display: flex; align-items: center; gap: 10px; }
.main-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 24px;
    border-radius: 999px;
    background: linear-gradient(135deg, #35D7FF 0%, #1688D8 100%);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 10px 22px rgba(22, 136, 216, .22);
    transition: transform .2s ease, box-shadow .2s ease;
    white-space: nowrap;
}
.main-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(22, 136, 216, .28); }
.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; border-radius: 999px; background: var(--primary-strong); }
.drawer-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1190;
    opacity: 0;
    background: rgba(7, 58, 104, .34);
    backdrop-filter: blur(3px);
    transition: opacity .25s ease;
}
.drawer-backdrop.show { opacity: 1; }
.mobile-drawer {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1200;
    width: min(88vw, 380px);
    height: 100dvh;
    padding: 20px;
    overflow-y: auto;
    background: #fff;
    box-shadow: -24px 0 50px rgba(7, 58, 104, .18);
    transform: translateX(105%);
    transition: transform .28s ease;
}
.mobile-drawer.open { transform: translateX(0); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
.drawer-logo img { width: 158px; height: 46px; object-fit: contain; }
.drawer-close { width: 40px; height: 40px; border: 0; border-radius: 12px; background: var(--surface-soft); color: var(--text-strong); font-size: 28px; line-height: 1; }
.drawer-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding: 18px 0; }
.drawer-nav a { padding: 11px 12px; border: 1px solid var(--border); border-radius: 12px; background: var(--bg); color: #36566E; font-weight: 700; text-align: center; }
.drawer-nav a.active { background: var(--surface-soft); color: var(--primary-strong); border-color: rgba(22, 136, 216, .28); }
.drawer-register { width: 100%; }

.page-main { min-height: 60vh; }
.container { width: min(100% - 32px, 1220px); margin: 0 auto; }
.section { padding: clamp(58px, 7vw, 92px) 0; }
.section-tight { padding: clamp(40px, 5vw, 64px) 0; }
.section-soft { background: linear-gradient(180deg, rgba(232, 247, 255, .78), rgba(244, 251, 255, .34)); }
.section-white { background: #fff; }
.section-head { max-width: 760px; margin: 0 auto 34px; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 12px; color: var(--primary-strong); font-size: 13px; font-weight: 900; letter-spacing: .12em; }
.eyebrow::before, .eyebrow::after { content: ""; width: 24px; height: 1px; background: var(--primary); }
h1, h2, h3 { margin-top: 0; color: var(--text-strong); line-height: 1.28; }
h1 { margin-bottom: 18px; font-size: clamp(34px, 5vw, 62px); letter-spacing: -.03em; }
h2 { margin-bottom: 14px; font-size: clamp(26px, 3.2vw, 42px); }
h3 { margin-bottom: 10px; font-size: clamp(18px, 2vw, 23px); }
p { margin-top: 0; }
.lead { color: #405D72; font-size: clamp(17px, 2vw, 20px); }
.muted { color: var(--muted); }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--primary-strong); font-weight: 800; }
.text-link::after { content: "→"; transition: transform .2s ease; }
.text-link:hover::after { transform: translateX(4px); }

.page-hero { padding: clamp(64px, 8vw, 104px) 0 clamp(48px, 6vw, 76px); background: radial-gradient(circle at 80% 18%, rgba(53, 215, 255, .22), transparent 28%), linear-gradient(145deg, #fff 0%, #E8F7FF 100%); }
.page-hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(320px, .92fr); gap: clamp(28px, 5vw, 70px); align-items: center; }
.page-hero-copy { max-width: 720px; }
.page-hero-copy p { max-width: 680px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.secondary-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 10px 22px; border: 1px solid rgba(22, 136, 216, .24); border-radius: 999px; background: rgba(255,255,255,.82); color: var(--primary-strong); font-weight: 800; }
.hero-media, .content-image { overflow: hidden; border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow); }
.hero-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; }

.carousel-wrap { padding: 28px 0 0; }
.carousel {
    position: relative;
    width: min(100% - 32px, 1360px);
    margin: 0 auto;
    overflow: hidden;
    border-radius: clamp(18px, 3vw, 32px);
    background: #dff5ff;
    box-shadow: 0 20px 54px rgba(21, 90, 157, .15);
}
.carousel-track { display: flex; transition: transform .55s cubic-bezier(.22,.61,.36,1); }
.carousel-slide { flex: 0 0 100%; min-width: 0; }
.carousel-slide img { width: 100%; aspect-ratio: 1920 / 720; object-fit: contain; background: #E8F7FF; }
.carousel-control {
    position: absolute;
    top: 50%;
    z-index: 4;
    width: clamp(40px, 4vw, 52px);
    height: clamp(40px, 4vw, 52px);
    border: 0;
    border-radius: 50%;
    background: rgba(255,255,255,.88);
    color: var(--primary-strong);
    box-shadow: 0 8px 20px rgba(7,58,104,.18);
    transform: translateY(-50%);
    font-size: 28px;
    line-height: 1;
}
.carousel-control.prev { left: clamp(10px, 2vw, 24px); }
.carousel-control.next { right: clamp(10px, 2vw, 24px); }
.carousel-dots { position: absolute; left: 50%; bottom: clamp(10px, 1.8vw, 22px); z-index: 4; display: flex; gap: 8px; transform: translateX(-50%); }
.carousel-dot { width: 9px; height: 9px; padding: 0; border: 0; border-radius: 50%; background: rgba(255,255,255,.62); box-shadow: 0 0 0 1px rgba(21,90,157,.18); }
.carousel-dot.active { width: 28px; border-radius: 999px; background: #fff; }

.intro-panel { display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; align-items: stretch; }
.intro-card, .stat-card, .info-card, .review-card, .faq-card, .notice-card, .feature-card, .category-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: rgba(255,255,255,.94);
    box-shadow: var(--shadow-soft);
}
.intro-card { padding: clamp(28px, 4vw, 48px); }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.stat-card { padding: 24px; background: linear-gradient(145deg, #fff, #E8F7FF); }
.stat-card strong { display: block; margin-bottom: 6px; color: var(--primary-strong); font-size: 26px; }

.grid { display: grid; gap: 22px; }
.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)); }
.category-card, .info-card, .feature-card { padding: 26px; }
.category-card { display: flex; min-height: 220px; flex-direction: column; }
.category-card p { flex: 1; color: var(--muted); }
.info-card p, .feature-card p { color: var(--muted); }
.card-index { display: inline-grid; place-items: center; width: 42px; height: 42px; margin-bottom: 18px; border-radius: 14px; background: var(--surface-soft); color: var(--primary-strong); font-weight: 900; }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .92fr); gap: clamp(28px, 5vw, 62px); align-items: center; }
.split.reverse .content-image { order: -1; }
.content-image img { width: 100%; max-height: 520px; aspect-ratio: 4 / 3; object-fit: contain; }
.bullet-list { display: grid; gap: 12px; margin: 22px 0 0; padding: 0; list-style: none; }
.bullet-list li { position: relative; padding-left: 28px; color: #466477; }
.bullet-list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--primary-strong); font-weight: 900; }

.product-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.product-mini { overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius-md); background: #fff; box-shadow: var(--shadow-soft); }
.product-mini img { width: 100%; aspect-ratio: 16 / 10; object-fit: contain; background: var(--surface-soft); }
.product-mini .copy { padding: 20px; }
.product-mini .copy p { color: var(--muted); }

.review-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.review-card { padding: 24px; }
.review-card strong { display: block; margin-bottom: 10px; color: var(--primary-strong); }
.review-card p { margin-bottom: 0; color: #4D6678; }

.faq-list { display: grid; gap: 14px; }
details.faq-card { padding: 0; overflow: hidden; }
details.faq-card summary { padding: 20px 24px; color: var(--text-strong); font-weight: 900; list-style: none; cursor: pointer; }
details.faq-card summary::-webkit-details-marker { display: none; }
details.faq-card summary::after { content: "+"; float: right; color: var(--primary-strong); font-size: 22px; }
details.faq-card[open] summary::after { content: "−"; }
details.faq-card p { padding: 0 24px 22px; margin: 0; color: var(--muted); }

.notice-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 16px; }
.notice-card { padding: 22px; background: linear-gradient(145deg, #fff, #F4FBFF); }
.notice-card h3 { font-size: 18px; }
.notice-card p { margin-bottom: 0; color: var(--muted); font-size: 15px; }

.cta-band { display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: clamp(30px, 4vw, 48px); border-radius: var(--radius-lg); background: linear-gradient(135deg, #0FAFEA, #176FB9); color: #fff; box-shadow: var(--shadow); }
.cta-band h2, .cta-band p { color: #fff; }
.cta-band p { margin-bottom: 0; opacity: .9; }
.cta-band .main-btn { background: #fff; color: var(--primary-strong); box-shadow: none; }

.site-footer { padding-top: 52px; background: #073A68; color: #EAF8FF; }
.footer-shell { width: min(100% - 32px, 1220px); margin: 0 auto; display: grid; grid-template-columns: 1.1fr 1.9fr; gap: 56px; padding-bottom: 38px; }
.footer-brand img { width: 180px; height: 56px; object-fit: contain; margin-bottom: 18px; filter: brightness(0) invert(1); }
.footer-brand p { max-width: 520px; color: rgba(234,248,255,.78); }
.footer-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.footer-links h2 { margin-bottom: 14px; color: #fff; font-size: 17px; }
.footer-links a { display: block; margin: 9px 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; text-align: center; }
.footer-notice p { margin: 4px auto; max-width: 980px; color: rgba(234,248,255,.72); font-size: 14px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-md); background: #fff; box-shadow: var(--shadow-soft); }
.info-table { width: 100%; border-collapse: collapse; min-width: 720px; }
.info-table th, .info-table td { padding: 16px 18px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.info-table th { background: var(--surface-soft); color: var(--text-strong); }
.info-table tr:last-child td { border-bottom: 0; }

.contact-flow { counter-reset: step; }
.contact-flow .feature-card { position: relative; padding-left: 76px; }
.contact-flow .feature-card::before { counter-increment: step; content: counter(step); position: absolute; left: 24px; top: 24px; width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; background: var(--surface-soft); color: var(--primary-strong); font-weight: 900; }

@media (max-width: 1179px) {
    .desktop-nav { display: none; }
    .menu-toggle { display: block; }
    .header-shell { justify-content: space-between; }
}
@media (max-width: 980px) {
    .page-hero-grid, .intro-panel, .split { grid-template-columns: 1fr; }
    .hero-media { max-width: 720px; }
    .split.reverse .content-image { order: 0; }
    .grid-4, .product-strip, .notice-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-3, .review-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-shell { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
    :root { --header-height: 68px; }
    .header-shell, .container, .carousel { width: min(100% - 24px, 1220px); }
    .brand-logo img { width: 136px; height: 42px; }
    .header-actions .main-btn { min-height: 38px; padding: 8px 16px; }
    .page-hero { padding-top: 50px; }
    .page-hero-grid { gap: 24px; }
    .hero-media img, .content-image img { aspect-ratio: 4 / 3; }
    .carousel-wrap { padding-top: 14px; }
    .carousel-slide img { aspect-ratio: 16 / 8; }
    .carousel-control { width: 38px; height: 38px; font-size: 22px; }
    .grid-2, .grid-3, .grid-4, .product-strip, .review-grid, .notice-grid, .stat-grid { grid-template-columns: 1fr; }
    .cta-band { align-items: flex-start; flex-direction: column; }
    .footer-links { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .drawer-nav { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 430px) {
    .header-shell { gap: 8px; }
    .brand-logo img { width: 116px; }
    .header-actions { gap: 6px; }
    .header-actions .main-btn { padding-inline: 14px; }
    .menu-toggle { width: 40px; height: 40px; }
    .drawer-nav { grid-template-columns: 1fr; }
    .footer-links { grid-template-columns: 1fr; }
}