:root {
    --bg: #F4FBFF;
    --nav: #FFFFFF;
    --soft: #E8F7FF;
    --card: #FFFFFF;
    --primary: #11AEEA;
    --accent: #1688D8;
    --deep: #155A9D;
    --text: #24384A;
    --muted: #60758A;
    --border: rgba(17, 174, 234, 0.18);
    --gradient: linear-gradient(135deg, #35D7FF 0%, #1688D8 100%);
    --footer: #073A68;
    --footer-text: #EAF8FF;
    --shadow: 0 18px 50px rgba(20, 111, 169, 0.12);
    --shadow-soft: 0 10px 30px rgba(20, 111, 169, 0.09);
    --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: 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: 1.75;
    padding-top: var(--header-height);
}
body.drawer-open { overflow: hidden; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
.container { width: min(100% - 32px, 1360px); margin-inline: auto; }
.section-pad { padding: clamp(58px, 7vw, 96px) 0; }
.section-soft { background: var(--soft); }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 2000; background: var(--footer); color: #fff; padding: 10px 16px; border-radius: 10px; }
.skip-link:focus { top: 12px; }

.site-header {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--header-height);
    z-index: 1000;
    background: rgba(255,255,255,.96);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
    transition: box-shadow .25s ease, background .25s ease;
}
.site-header.is-scrolled { box-shadow: 0 10px 30px rgba(21, 90, 157, .12); background: rgba(255,255,255,.99); }
.header-inner {
    width: min(100% - 32px, 1360px);
    height: 100%;
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: clamp(14px, 1.7vw, 26px);
    min-width: 0;
}
.site-logo { flex: 0 0 auto; display: inline-flex; align-items: center; max-width: 136px; }
.site-logo img { width: clamp(92px, 8.5vw, 126px); max-height: 48px; object-fit: contain; }
.desktop-nav { flex: 1; min-width: 0; display: flex; align-items: center; justify-content: center; gap: clamp(8px, .9vw, 16px); }
.desktop-nav a { white-space: nowrap; font-size: clamp(12px, .82vw, 15px); color: #35536D; font-weight: 600; padding: 9px 2px; position: relative; }
.desktop-nav a::after { content: ""; position: absolute; left: 50%; right: 50%; bottom: 2px; height: 2px; background: var(--primary); transition: .2s ease; }
.desktop-nav a:hover, .desktop-nav a.is-active { color: var(--accent); }
.desktop-nav a:hover::after, .desktop-nav a.is-active::after { left: 0; right: 0; }
.main-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 10px 24px;
    border: 0;
    border-radius: 999px;
    color: #fff;
    background: var(--gradient);
    box-shadow: 0 10px 24px rgba(22, 136, 216, .22);
    font-weight: 700;
    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); }
.header-register { flex: 0 0 auto; padding-inline: clamp(18px, 2vw, 28px); }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 10px; border: 1px solid var(--border); border-radius: 13px; background: #fff; flex: 0 0 auto; }
.menu-toggle span { display: block; height: 2px; border-radius: 2px; background: var(--deep); margin: 5px 0; }
.drawer-mask { position: fixed; inset: 0; z-index: 1090; background: rgba(7,58,104,.42); }
.mobile-drawer { position: fixed; top: 0; right: 0; bottom: 0; z-index: 1100; width: min(88vw, 380px); padding: 22px; background: #fff; transform: translateX(105%); transition: transform .28s ease; box-shadow: -20px 0 50px rgba(7,58,104,.18); overflow-y: auto; }
body.drawer-open .mobile-drawer { transform: translateX(0); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.drawer-brand { font-size: 27px; font-weight: 800; color: var(--accent); letter-spacing: .08em; }
.drawer-close { width: 42px; height: 42px; border: 0; border-radius: 50%; background: var(--soft); color: var(--deep); font-size: 28px; line-height: 1; }
.drawer-nav { display: grid; gap: 7px; padding: 16px 0; }
.drawer-nav a { padding: 11px 14px; border-radius: 12px; color: var(--text); font-weight: 650; }
.drawer-nav a:hover, .drawer-nav a.is-active { background: var(--soft); color: var(--accent); }
.drawer-register { width: 100%; }

.hero-carousel-wrap { padding: 28px 0 0; }
.hero-carousel { position: relative; width: min(100% - 32px, 1360px); margin-inline: auto; border-radius: var(--radius-xl); overflow: hidden; background: #dff5ff; box-shadow: var(--shadow); aspect-ratio: 16 / 5.35; }
.carousel-track { position: relative; width: 100%; height: 100%; }
.carousel-slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .6s ease; }
.carousel-slide.is-active { opacity: 1; visibility: visible; z-index: 1; }
.carousel-slide img { width: 100%; height: 100%; object-fit: contain; background: #eaf9ff; }
.carousel-arrow { position: absolute; z-index: 5; top: 50%; transform: translateY(-50%); width: 46px; height: 46px; border-radius: 50%; border: 1px solid rgba(255,255,255,.78); color: #fff; background: rgba(7,58,104,.46); font-size: 26px; display: grid; place-items: center; }
.carousel-arrow:hover { background: rgba(7,58,104,.72); }
.carousel-prev { left: 18px; }
.carousel-next { right: 18px; }
.carousel-dots { position: absolute; z-index: 5; left: 50%; bottom: 16px; transform: translateX(-50%); display: flex; gap: 9px; }
.carousel-dot { width: 10px; height: 10px; padding: 0; border-radius: 50%; border: 1px solid #fff; background: rgba(255,255,255,.52); }
.carousel-dot.is-active { width: 28px; border-radius: 10px; background: #fff; }

.home-intro { padding-top: 64px; }
.intro-panel, .inner-hero-grid, .support-layout, .split-layout { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr); align-items: center; gap: clamp(34px, 6vw, 78px); }
.eyebrow, .section-kicker { display: inline-block; color: var(--accent); font-weight: 800; letter-spacing: .08em; font-size: 13px; margin-bottom: 10px; }
h1, h2, h3 { color: var(--deep); line-height: 1.3; margin-top: 0; }
h1 { font-size: clamp(36px, 5.2vw, 72px); margin-bottom: 20px; letter-spacing: -.03em; }
h2 { font-size: clamp(28px, 3.5vw, 45px); margin-bottom: 18px; }
h3 { font-size: clamp(19px, 2vw, 24px); margin-bottom: 11px; }
p { margin: 0 0 16px; }
.lead { font-size: clamp(17px, 1.6vw, 21px); color: #45657D; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-top: 28px; }
.text-link { color: var(--accent); font-weight: 750; display: inline-flex; align-items: center; gap: 6px; }
.text-link::after { content: "→"; }
.hero-info-card, .info-panel, .safety-card { padding: clamp(26px, 4vw, 40px); background: #fff; border: 1px solid var(--border); border-radius: var(--radius-xl); box-shadow: var(--shadow-soft); }
.hero-info-card strong { display: block; font-size: 24px; color: var(--deep); margin-bottom: 12px; }
.brand-stat-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.brand-stat { padding: 24px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-soft); }
.brand-stat strong { display: block; color: var(--accent); font-size: 23px; margin-bottom: 5px; }
.brand-stat span { color: var(--muted); font-size: 14px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 34px; margin-bottom: 34px; }
.section-heading > p { max-width: 560px; color: var(--muted); margin-bottom: 6px; }
.compact-heading { margin-bottom: 28px; }
.card-grid { display: grid; gap: 20px; }
.card-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.content-card, .quick-card, .product-card, .review-card, .step-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-soft); }
.content-card, .quick-card, .step-card { padding: 26px; }
.content-card, .quick-card, .product-card, .review-card, .step-card { transition: transform .2s ease, box-shadow .2s ease; }
.content-card:hover, .quick-card:hover, .product-card:hover, .review-card:hover, .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card-index { display: inline-flex; width: 38px; height: 38px; align-items: center; justify-content: center; margin-bottom: 22px; border-radius: 50%; color: #fff; background: var(--gradient); font-weight: 800; }
.quick-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; }
.quick-card h3 { font-size: 18px; }
.quick-card p { color: var(--muted); font-size: 14px; }
.product-showcase { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.product-card { overflow: hidden; }
.product-card img { width: 100%; aspect-ratio: 16/10; object-fit: contain; background: #eaf9ff; }
.product-body { padding: 24px; }
.feature-media, .image-card { margin: 0; overflow: hidden; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-xl); box-shadow: var(--shadow-soft); }
.feature-media img { width: 100%; min-height: 300px; max-height: 460px; object-fit: contain; background: #eaf9ff; }
.image-grid { display: grid; gap: 20px; }
.image-grid-1 { grid-template-columns: 1fr; }
.image-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.image-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.image-card img { width: 100%; aspect-ratio: 16/10; object-fit: contain; background: #eaf9ff; }
.image-card figcaption { padding: 15px 18px; font-weight: 700; color: var(--deep); }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.check-list li { position: relative; padding-left: 30px; color: #425E75; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 0; width: 21px; height: 21px; border-radius: 50%; display: grid; place-items: center; color: #fff; background: var(--gradient); font-size: 12px; }
.steps-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 20px; }
.step-card > span { display: block; font-size: 36px; color: rgba(17,174,234,.22); font-weight: 900; line-height: 1; margin-bottom: 18px; }
.support-layout { align-items: stretch; }
.support-copy { padding-right: 24px; }
.inline-links { display: flex; flex-wrap: wrap; gap: 12px 20px; margin-top: 22px; }
.inline-links a { color: var(--accent); font-weight: 750; }
.review-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.review-card { margin: 0; padding: 26px; }
.review-card p { color: #3B5970; }
.review-card footer { color: var(--accent); font-weight: 800; }
.compliance-section { padding-top: 22px; }
.compliance-card { display: grid; grid-template-columns: minmax(260px, .8fr) minmax(0, 1.2fr); gap: 34px; align-items: center; padding: clamp(28px, 4vw, 48px); border-radius: var(--radius-xl); background: linear-gradient(135deg, #dff7ff 0%, #f8fdff 100%); border: 1px solid var(--border); box-shadow: var(--shadow-soft); }
.compliance-card p { margin: 0; color: #49667B; }

.category-band { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 16px; }
.category-chip { padding: 18px 20px; border-radius: 16px; background: rgba(255,255,255,.82); border: 1px solid var(--border); }
.category-chip strong { display: block; color: var(--deep); margin-bottom: 5px; }
.category-chip span { color: var(--muted); font-size: 14px; }
.notice-list { display: grid; gap: 14px; }
.notice-item { display: grid; grid-template-columns: 110px 1fr; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--border); }
.notice-item time { color: var(--accent); font-weight: 800; }
.notice-item h3 { margin-bottom: 5px; font-size: 19px; }
.faq-list { display: grid; gap: 14px; }
details.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow-soft); overflow: hidden; }
details.faq-item summary { list-style: none; cursor: pointer; padding: 20px 24px; color: var(--deep); font-weight: 800; position: relative; }
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after { content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%); font-size: 25px; color: var(--accent); }
details.faq-item[open] summary::after { content: "−"; }
details.faq-item p { padding: 0 24px 22px; color: #4C687D; margin: 0; }
.contact-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 20px; }
.contact-card { padding: 30px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-soft); }

.site-footer { margin-top: 80px; background: var(--footer); color: var(--footer-text); padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 38px; }
.footer-brand strong { display: block; font-size: 31px; letter-spacing: .08em; margin-bottom: 14px; }
.footer-brand p, .footer-note { color: rgba(234,248,255,.78); }
.site-footer h2 { color: #fff; font-size: 17px; margin-bottom: 16px; }
.site-footer a { display: block; color: rgba(234,248,255,.86); margin: 7px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 24px; margin-top: 34px; border-top: 1px solid rgba(255,255,255,.13); color: rgba(234,248,255,.74); font-size: 14px; }
.back-to-top { position: fixed; right: 20px; bottom: 20px; z-index: 800; width: 44px; height: 44px; border: 0; border-radius: 50%; background: var(--gradient); color: #fff; box-shadow: var(--shadow); opacity: 0; visibility: hidden; transform: translateY(10px); transition: .2s ease; }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }

@media (max-width: 1180px) {
    .desktop-nav { display: none; }
    .header-inner { gap: 12px; }
    .site-logo { margin-right: auto; }
    .menu-toggle { display: block; }
    .header-register { padding-inline: 20px; }
    .quick-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .card-grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
}

@media (max-width: 900px) {
    :root { --header-height: 70px; }
    .hero-carousel { aspect-ratio: 16 / 8.7; border-radius: 20px; }
    .intro-panel, .inner-hero-grid, .support-layout, .split-layout, .compliance-card { grid-template-columns: 1fr; }
    .section-heading { display: block; }
    .card-grid-3, .product-showcase, .steps-grid, .review-grid, .image-grid-3 { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .category-band { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .footer-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
    .support-copy { padding-right: 0; }
}

@media (max-width: 620px) {
    .container, .header-inner, .hero-carousel { width: min(100% - 22px, 1360px); }
    .header-register { min-height: 40px; padding: 8px 16px; }
    .menu-toggle { width: 40px; height: 40px; }
    .hero-carousel-wrap { padding-top: 14px; }
    .hero-carousel { aspect-ratio: 16 / 10.5; border-radius: 16px; }
    .carousel-arrow { width: 38px; height: 38px; font-size: 21px; }
    .carousel-prev { left: 10px; }
    .carousel-next { right: 10px; }
    .carousel-dots { bottom: 10px; }
    .section-pad { padding: 48px 0; }
    h1 { font-size: clamp(34px, 11vw, 50px); }
    h2 { font-size: 28px; }
    .quick-grid, .card-grid-2, .card-grid-3, .card-grid-4, .product-showcase, .steps-grid, .review-grid, .image-grid-2, .image-grid-3, .category-band, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
    .brand-stat-grid { grid-template-columns: 1fr 1fr; }
    .notice-item { grid-template-columns: 1fr; gap: 4px; }
    .footer-bottom { flex-direction: column; }
    .feature-media img { min-height: 220px; }
}