* { box-sizing: border-box; }
:root {
    --red: #C90000;
    --red-dark: #A80000;
    --red-soft: rgba(201,0,0,.08);
    --ink: #1F2329;
    --muted: #5D6673;
    --light: #F6F7F9;
    --section: #F1F3F6;
    --border: rgba(201,0,0,.12);
    --shadow: 0 12px 30px rgba(18,28,45,.08);
    --radius: 18px;
    --header-h: 74px;
}
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: #FFFFFF;
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.75;
    padding-top: var(--header-h);
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea { font: inherit; }
.container { width: min(1240px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 9999; background: #11151C; color: #fff; padding: 10px 14px; border-radius: 10px; }
.skip-link:focus { top: 12px; }

.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1000;
    background: rgba(255,255,255,.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(201,0,0,.08);
}
.header-inner { min-height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { flex: 0 0 auto; }
.logo img { max-height: 52px; width: auto; }
.nav-core { display: flex; align-items: center; justify-content: center; gap: 18px; white-space: nowrap; flex-wrap: nowrap; min-width: 0; }
.nav-core a { color: var(--ink); padding: 10px 4px; position: relative; font-weight: 700; font-size: 15px; }
.nav-core a:hover, .nav-core a.active { color: var(--red); }
.nav-core a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -10px; height: 3px; border-radius: 999px; background: var(--red); }
.main-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 10px 24px; border-radius: 999px; background: linear-gradient(180deg,#F12B2B 0%,#C90000 55%,#A80000 100%); color: #fff; font-weight: 800; box-shadow: 0 8px 20px rgba(201,0,0,.18); transition: transform .2s ease, box-shadow .2s ease; }
.main-btn:hover { transform: translateY(-1px); box-shadow: 0 12px 26px rgba(201,0,0,.24); }
.header-register { flex: 0 0 auto; min-width: 88px; }
.mobile-menu-btn { display: none; width: 42px; height: 42px; border: 0; background: transparent; padding: 9px; border-radius: 12px; }
.mobile-menu-btn span { display: block; height: 2px; margin: 5px 0; background: var(--ink); border-radius: 999px; }

.site-shell { display: grid; grid-template-columns: 210px minmax(0,1fr); gap: 28px; align-items: start; padding-block: 28px 70px; }
.site-main { min-width: 0; }
.side-category { position: sticky; top: 96px; background: #fff; border: 1px solid rgba(201,0,0,.10); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; max-height: calc(100vh - 118px); overflow: auto; }
.side-title { font-size: 17px; font-weight: 900; color: var(--red); padding: 8px 10px 12px; border-bottom: 1px solid #eceff3; margin-bottom: 8px; }
.side-category nav { display: grid; gap: 3px; }
.side-category a { color: var(--ink); border-radius: 12px; padding: 9px 10px; font-size: 14px; line-height: 1.35; }
.side-category a:hover, .side-category a.active { color: var(--red); background: var(--red-soft); font-weight: 700; }

.mobile-drawer { position: fixed; z-index: 1300; inset: 0 auto 0 0; width: min(84vw,320px); background: #fff; transform: translateX(-105%); transition: transform .25s ease; box-shadow: 16px 0 40px rgba(18,28,45,.16); overflow-y: auto; }
.mobile-drawer.open { transform: translateX(0); }
.drawer-mask { position: fixed; z-index: 1200; inset: 0; background: rgba(17,21,28,.48); opacity: 0; transition: opacity .2s ease; }
.drawer-mask.show { opacity: 1; }
.drawer-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px; border-bottom: 1px solid #edf0f4; }
.drawer-logo img { max-height: 44px; width: auto; }
.drawer-close { border: 0; background: var(--light); width: 40px; height: 40px; border-radius: 50%; font-size: 28px; line-height: 1; color: var(--ink); }
.drawer-nav { display: grid; padding: 12px; }
.drawer-nav a { padding: 11px 13px; border-radius: 12px; font-weight: 650; }
.drawer-nav a:hover, .drawer-nav a.active { color: var(--red); background: var(--red-soft); }

.banner-slider { width: 100%; margin: 0 auto 34px; border-radius: 22px; background: #F7F8FA; box-shadow: var(--shadow); overflow: hidden; position: relative; min-height: 260px; height: clamp(260px, 31vw, 360px); }
.banner-track, .banner-slide { width: 100%; height: 100%; }
.banner-slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .5s ease; }
.banner-slide.active { opacity: 1; visibility: visible; }
.banner-slider img { width: 100%; height: 100%; object-fit: contain; background: #F7F8FA; }
.banner-arrow { position: absolute; z-index: 3; top: 50%; transform: translateY(-50%); width: 44px; height: 44px; border: 0; border-radius: 50%; background: rgba(17,21,28,.68); cursor: pointer; }
.banner-arrow::before { color: #fff; font-size: 32px; line-height: 1; position: absolute; inset: 3px 0 0; }
.banner-arrow.prev { left: 16px; }
.banner-arrow.next { right: 16px; }
.banner-arrow.prev::before { content: "‹"; }
.banner-arrow.next::before { content: "›"; }
.banner-dots { position: absolute; z-index: 3; left: 50%; bottom: 14px; transform: translateX(-50%); display: flex; gap: 8px; }
.banner-dots button { width: 9px; height: 9px; padding: 0; border: 0; border-radius: 999px; background: rgba(255,255,255,.65); box-shadow: 0 0 0 1px rgba(17,21,28,.16); }
.banner-dots button.active { width: 26px; background: #fff; }
.banner-caption, .banner-text, .slide-title, .slide-desc, .slide-content, .slide-card, .banner-card { display: none !important; }

.section { padding: 34px 0; }
.section.soft { background: var(--light); border-radius: 24px; padding-inline: clamp(18px,3vw,34px); margin-block: 20px; }
.section.tint { background: linear-gradient(135deg,rgba(201,0,0,.06),rgba(201,0,0,.015)); border: 1px solid var(--border); border-radius: 24px; padding-inline: clamp(18px,3vw,34px); margin-block: 20px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.section-heading > div { max-width: 760px; }
.eyebrow { color: var(--red); font-weight: 900; letter-spacing: .08em; font-size: 13px; }
h1, h2, h3, .section-title { color: var(--red); line-height: 1.28; }
h1 { font-size: clamp(30px,4vw,52px); margin: 8px 0 16px; }
h2 { font-size: clamp(24px,3vw,34px); margin: 0 0 10px; }
h3 { font-size: 20px; margin: 0 0 8px; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 18px; color: #3D4652; }
.text-link { color: var(--red); font-weight: 800; }

.card, .zone-card, .info-card, .review-card, .faq-item, .channel-card, .summary-card { background: #fff; border: 1px solid rgba(201,0,0,.10); box-shadow: var(--shadow); border-radius: var(--radius); }
.card, .zone-card, .info-card, .channel-card, .summary-card { overflow: hidden; }
.card-body, .zone-body, .info-body, .channel-card, .summary-card { padding: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 18px; }
.channel-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; }
.channel-card { min-height: 150px; display: flex; flex-direction: column; justify-content: space-between; }
.channel-card p { font-size: 14px; }
.summary-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 16px; }
.summary-card { padding: 20px; border-top: 4px solid var(--red); }
.summary-card strong { display: block; color: var(--red); font-size: 18px; margin-bottom: 8px; }
.zone-card img, .info-card img, .content-img { width: 100%; height: 220px; object-fit: contain; background: #F7F8FA; }
.product-card img { width: 100%; height: 170px; object-fit: contain; background: #F7F8FA; }
.media-split { display: grid; grid-template-columns: minmax(0,1.05fr) minmax(0,.95fr); gap: 26px; align-items: center; }
.media-split.reverse { grid-template-columns: minmax(0,.95fr) minmax(0,1.05fr); }
.media-split.reverse .media-visual { order: 2; }
.media-visual { border-radius: 22px; overflow: hidden; background: #F7F8FA; border: 1px solid var(--border); box-shadow: var(--shadow); }
.media-visual img { width: 100%; height: clamp(220px,30vw,300px); object-fit: contain; }
.media-copy { padding: 8px 0; }
.clean-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 11px; }
.clean-list li { position: relative; padding-left: 24px; color: var(--muted); }
.clean-list li::before { content: ""; position: absolute; left: 0; top: .72em; width: 10px; height: 10px; border-radius: 50%; background: var(--red); box-shadow: 0 0 0 5px var(--red-soft); }

.inner-hero { display: grid; grid-template-columns: minmax(0,1.1fr) minmax(320px,.9fr); gap: 30px; align-items: center; padding: clamp(28px,5vw,56px); border-radius: 26px; background: linear-gradient(135deg,#fff 0%,#F6F7F9 58%,rgba(201,0,0,.07) 100%); border: 1px solid var(--border); overflow: hidden; }
.inner-hero img { width: 100%; height: 280px; object-fit: contain; background: rgba(255,255,255,.72); border-radius: 20px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 22px; }
.sub-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 10px 20px; border-radius: 999px; border: 1px solid var(--border); color: var(--red); background: #fff; font-weight: 800; }
.feature-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 18px; }
.feature-card { padding: 22px; border-radius: var(--radius); background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow); }
.feature-card .num { display: inline-flex; width: 34px; height: 34px; align-items: center; justify-content: center; border-radius: 50%; color: #fff; background: var(--red); font-weight: 900; margin-bottom: 14px; }
.steps { counter-reset: step; display: grid; gap: 14px; }
.step { counter-increment: step; display: grid; grid-template-columns: 46px minmax(0,1fr); gap: 14px; align-items: start; padding: 17px; border-radius: 16px; background: #fff; border: 1px solid var(--border); }
.step::before { content: counter(step, decimal-leading-zero); display: inline-flex; width: 40px; height: 40px; align-items: center; justify-content: center; border-radius: 12px; background: var(--red-soft); color: var(--red); font-weight: 900; }
.review-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 18px; }
.review-card { padding: 22px; }
.review-card strong { color: var(--ink); display: block; margin-bottom: 8px; }
.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 18px 20px; }
.faq-item summary { cursor: pointer; list-style: none; font-weight: 850; color: var(--ink); position: relative; padding-right: 28px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 0; top: -2px; color: var(--red); font-size: 24px; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 12px 0 0; }
.compliance-box { padding: 24px; border-radius: 20px; background: #11151C; color: #E7ECF3; }
.compliance-box h2 { color: #fff; }
.compliance-box p { color: #C7CFDA; }

.site-footer { background: #11151C; color: #E7ECF3; padding: 50px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 36px; }
.footer-brand img { max-height: 52px; width: auto; margin-bottom: 16px; }
.site-footer h2 { color: #fff; font-size: 17px; margin: 0 0 14px; }
.site-footer a { display: block; color: #E7ECF3; margin: 8px 0; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.site-footer p { color: #BFC7D3; }
.footer-notice { border-top: 1px solid rgba(255,255,255,.12); margin-top: 34px; padding-top: 22px; display: flex; justify-content: space-between; gap: 24px; font-size: 13px; }
.footer-notice p:first-child { max-width: 800px; }
.mobile-bottom-nav { display: none; }

@media (max-width: 1080px) {
    .site-shell { grid-template-columns: 185px minmax(0,1fr); gap: 20px; }
    .nav-core { gap: 12px; }
    .nav-core a { font-size: 14px; }
    .grid-4, .summary-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
    .inner-hero { grid-template-columns: 1fr 360px; }
}
@media (max-width: 920px) {
    :root { --header-h: 66px; }
    body { padding-bottom: 70px; }
    .container { width: min(100% - 28px, 860px); }
    .header-inner { min-height: var(--header-h); display: grid; grid-template-columns: 44px 1fr auto; gap: 10px; }
    .mobile-menu-btn { display: block; }
    .logo { justify-self: center; }
    .logo img { max-height: 44px; }
    .nav-core { display: none; }
    .header-register { min-width: 72px; padding-inline: 16px; }
    .site-shell { display: block; padding-top: 20px; }
    .side-category { display: none; }
    .mobile-bottom-nav { position: fixed; z-index: 1000; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: repeat(4,1fr); background: rgba(255,255,255,.98); border-top: 1px solid rgba(201,0,0,.12); box-shadow: 0 -8px 26px rgba(18,28,45,.08); padding-bottom: env(safe-area-inset-bottom); }
    .mobile-bottom-nav a { text-align: center; padding: 12px 5px 10px; font-size: 13px; font-weight: 800; color: #4D5663; }
    .mobile-bottom-nav a.active { color: var(--red); background: var(--red-soft); }
    .inner-hero { grid-template-columns: 1fr; padding: 30px; }
    .inner-hero img { height: 240px; }
    .feature-grid, .review-grid, .channel-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
    .media-split, .media-split.reverse { grid-template-columns: 1fr; }
    .media-split.reverse .media-visual { order: 0; }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
}
@media (max-width: 640px) {
    .container { width: min(100% - 20px, 620px); }
    .site-shell { padding-bottom: 44px; }
    .banner-slider { height: clamp(150px,52vw,210px); min-height: 150px; border-radius: 16px; margin-bottom: 22px; }
    .banner-arrow { width: 36px; height: 36px; }
    .banner-arrow.prev { left: 8px; }
    .banner-arrow.next { right: 8px; }
    .section { padding: 26px 0; }
    .section.soft, .section.tint { border-radius: 18px; margin-block: 12px; padding-inline: 16px; }
    .section-heading { align-items: start; flex-direction: column; }
    h1 { font-size: 30px; }
    h2 { font-size: 24px; }
    .lead { font-size: 16px; }
    .grid-2, .grid-3, .grid-4, .summary-grid, .feature-grid, .review-grid, .channel-grid { grid-template-columns: 1fr; }
    .zone-card img, .info-card img, .content-img { height: 185px; }
    .product-card img { height: 150px; }
    .media-visual img { height: 210px; }
    .inner-hero { padding: 22px; border-radius: 20px; }
    .inner-hero img { height: 190px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-notice { flex-direction: column; }
}