:root {
    --red: #c90000;
    --red-dark: #a80000;
    --red-soft: rgba(201, 0, 0, 0.08);
    --text: #1f2329;
    --muted: #5d6673;
    --light: #8a93a0;
    --line: rgba(201, 0, 0, 0.12);
    --surface: #ffffff;
    --soft: #f6f7f9;
    --soft-2: #f1f3f6;
    --shadow: 0 12px 30px rgba(18, 28, 45, 0.08);
    --radius: 18px;
    --header-h: 74px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: #ffffff;
    color: var(--text);
    font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    line-height: 1.75;
    overflow-x: hidden;
}
body.drawer-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea { font: inherit; }

.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(201, 0, 0, 0.08);
}
.header-inner {
    width: min(1440px, calc(100% - 40px));
    min-height: var(--header-h);
    margin: 0 auto;
    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 {
    position: relative;
    padding: 10px 4px;
    color: var(--text);
    font-weight: 700;
    transition: .2s ease;
}
.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,
.outline-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 22px;
    border-radius: 999px;
    font-weight: 800;
    transition: transform .2s ease, box-shadow .2s ease;
}
.main-btn {
    color: #ffffff;
    background: linear-gradient(180deg, #f12b2b 0%, #c90000 55%, #a80000 100%);
    box-shadow: 0 8px 18px rgba(201, 0, 0, .20);
}
.main-btn:hover,
.outline-btn:hover { transform: translateY(-2px); }
.header-register { flex: 0 0 auto; min-width: 82px; }
.outline-btn { color: var(--red); border: 1px solid rgba(201, 0, 0, .26); background: #fff; }
.text-link { color: var(--red); font-weight: 800; }
.text-link::after { content: " →"; }

.menu-toggle {
    width: 42px;
    height: 42px;
    padding: 10px;
    border: 0;
    background: transparent;
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
}
.menu-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 99px; }

.site-layout {
    width: min(1440px, calc(100% - 40px));
    margin: 0 auto;
    padding-top: calc(var(--header-h) + 22px);
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
}
.side-category {
    position: sticky;
    top: 96px;
    align-self: start;
    max-height: calc(100vh - 116px);
    overflow: auto;
    background: #ffffff;
    border: 1px solid rgba(201, 0, 0, 0.10);
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: 14px;
}
.side-title {
    padding: 8px 10px 12px;
    color: var(--red);
    font-size: 14px;
    font-weight: 900;
    letter-spacing: .12em;
}
.side-category nav { display: grid; gap: 3px; }
.side-category a {
    padding: 9px 11px;
    color: var(--text);
    border-radius: 12px;
    font-size: 14px;
    font-weight: 700;
}
.side-category a:hover,
.side-category a.active { color: var(--red); background: var(--red-soft); }
.site-main { min-width: 0; padding-bottom: 56px; }

.banner-slider {
    position: relative;
    width: 100%;
    height: clamp(260px, 31vw, 360px);
    margin: 0 auto 34px;
    border-radius: 22px;
    background: #f7f8fa;
    box-shadow: var(--shadow);
    overflow: hidden;
}
.slides, .slide { width: 100%; height: 100%; }
.slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity .5s ease;
}
.slide.active { opacity: 1; visibility: visible; }
.slide img { width: 100%; height: 100%; object-fit: contain; background: #f7f8fa; }
.slider-prev,
.slider-next {
    position: absolute;
    top: 50%;
    z-index: 3;
    width: 44px;
    height: 44px;
    margin-top: -22px;
    border: 0;
    border-radius: 50%;
    background: rgba(17, 21, 28, .54);
    color: #fff;
    font-size: 26px;
    line-height: 1;
    cursor: pointer;
}
.slider-prev { left: 16px; }
.slider-next { right: 16px; }
.slider-dots {
    position: absolute;
    z-index: 3;
    left: 50%;
    bottom: 14px;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
}
.slider-dot {
    width: 9px;
    height: 9px;
    padding: 0;
    border: 0;
    border-radius: 99px;
    background: rgba(255, 255, 255, .62);
    cursor: pointer;
}
.slider-dot.active { width: 26px; background: #fff; }
.banner-caption, .banner-text, .slide-title, .slide-desc, .slide-content, .slide-card, .banner-card { display: none !important; }

.section-block {
    margin: 0 0 30px;
    padding: 34px;
    background: #ffffff;
    border: 1px solid rgba(201, 0, 0, 0.09);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.soft-section { background: var(--soft); border-color: transparent; }
.section-heading { margin-bottom: 20px; }
.section-heading h1,
.section-heading h2,
.section-heading h3,
h1, h2, h3 { margin: 0 0 10px; color: var(--red); line-height: 1.3; }
h1 { font-size: clamp(32px, 5vw, 54px); }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: 19px; }
p { margin: 0 0 14px; color: var(--muted); }
.eyebrow {
    display: inline-block;
    margin-bottom: 8px;
    color: var(--red);
    font-size: 13px;
    font-weight: 900;
    letter-spacing: .12em;
}

.brand-intro,
.page-hero,
.split-section,
.home-feature {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(300px, .92fr);
    align-items: center;
    gap: 34px;
}
.brand-intro-media,
.page-hero-media,
.split-media,
.home-feature-media {
    overflow: hidden;
    border-radius: 18px;
    background: #f7f8fa;
}
.brand-intro-media img,
.page-hero-media img,
.split-media img,
.home-feature-media img {
    width: 100%;
    height: 280px;
    object-fit: contain;
}
.hero-actions { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin-top: 22px; }

.channel-grid,
.feature-grid,
.product-grid,
.review-grid,
.summary-grid,
.mixed-grid {
    display: grid;
    gap: 18px;
}
.channel-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.product-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.summary-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.review-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.mixed-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.channel-card,
.info-card,
.product-card,
.review-card,
.summary-card,
.zone-card {
    background: #ffffff;
    border: 1px solid rgba(201, 0, 0, 0.10);
    box-shadow: var(--shadow);
    border-radius: 18px;
}
.channel-card,
.info-card,
.summary-card { padding: 22px; }
.channel-card p,
.info-card p,
.summary-card p { font-size: 14px; }
.number-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 28px;
    padding: 0 9px;
    margin-bottom: 12px;
    border-radius: 99px;
    background: var(--red-soft);
    color: var(--red);
    font-weight: 900;
    font-size: 12px;
}
.summary-card { border-top: 4px solid var(--red); }
.product-card,
.zone-card { overflow: hidden; }
.product-card img,
.zone-card img {
    width: 100%;
    height: 170px;
    object-fit: contain;
    background: #f7f8fa;
}
.product-card .card-body,
.zone-card .card-body { padding: 20px; }
.review-card { margin: 0; padding: 24px; }
.review-card p { color: var(--text); font-size: 15px; }
.review-card footer { color: var(--red); font-weight: 800; }

.red-summary {
    background: linear-gradient(135deg, #c90000, #a80000);
    border: 0;
}
.red-summary h2,
.red-summary .eyebrow { color: #fff; }
.red-summary .summary-card { background: rgba(255,255,255,.97); box-shadow: none; }

.step-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.step-list li {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 16px;
    padding: 15px 0;
    border-bottom: 1px solid rgba(31, 35, 41, .08);
}
.step-list li:last-child { border-bottom: 0; }
.step-list strong { color: var(--red); }
.step-list span { color: var(--muted); }

.service-note,
.compliance-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.service-note { background: linear-gradient(135deg, #fff, #fff4f4); }
.compliance-box {
    margin-top: 30px;
    padding: 24px 28px;
    border-radius: 18px;
    background: #fff7f7;
    border: 1px solid rgba(201, 0, 0, .12);
}
.compliance-box strong { color: var(--red); white-space: nowrap; }
.compliance-box p { margin: 0; }
.compliance-box a { color: var(--red); font-weight: 800; white-space: nowrap; }
.prose-block p { max-width: 980px; }

.faq-list { display: grid; gap: 12px; }
details {
    background: #fff;
    border: 1px solid rgba(31, 35, 41, .08);
    border-radius: 14px;
    padding: 0 18px;
}
summary {
    padding: 16px 30px 16px 0;
    color: var(--text);
    font-weight: 800;
    cursor: pointer;
}
details p { padding: 0 0 16px; }

.notice-strip {
    margin-bottom: 30px;
    padding: 18px 22px;
    border-radius: 14px;
    background: #fff3f3;
    color: var(--muted);
    border-left: 4px solid var(--red);
}

.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.contact-card { padding: 24px; border-radius: 18px; background: var(--soft); }
.contact-card strong { color: var(--red); display: block; margin-bottom: 8px; }

.site-footer { background: #11151c; color: #e7ecf3; padding: 50px 0 24px; }
.footer-grid {
    width: min(1440px, calc(100% - 40px));
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.7fr 1fr 1fr 1fr;
    gap: 34px;
}
.footer-brand img { max-height: 50px; width: auto; margin-bottom: 18px; }
.site-footer h2 { color: #fff; font-size: 16px; }
.site-footer p { color: #aeb7c4; }
.site-footer a { display: block; margin: 8px 0; color: #d7dde6; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
    width: min(1440px, calc(100% - 40px));
    margin: 30px auto 0;
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    gap: 24px;
    border-top: 1px solid rgba(255,255,255,.09);
}
.footer-bottom p { margin: 0; font-size: 13px; }
.mobile-bottom-nav { display: none; }

.mobile-drawer {
    position: fixed;
    z-index: 1200;
    inset: 0 auto 0 0;
    width: min(84vw, 320px);
    background: #fff;
    transform: translateX(-102%);
    transition: transform .28s ease;
    box-shadow: 24px 0 50px rgba(17, 21, 28, .18);
    overflow-y: auto;
}
.mobile-drawer.open { transform: translateX(0); }
.drawer-overlay {
    position: fixed;
    z-index: 1150;
    inset: 0;
    background: rgba(17, 21, 28, .52);
    opacity: 0;
    transition: opacity .25s ease;
}
.drawer-overlay.visible { opacity: 1; }
.drawer-head {
    position: sticky;
    top: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: #fff;
    border-bottom: 1px solid rgba(31, 35, 41, .08);
}
.drawer-logo img { max-height: 44px; width: auto; }
.drawer-close { width: 40px; height: 40px; border: 0; background: var(--soft); border-radius: 50%; font-size: 28px; cursor: pointer; }
.drawer-nav { display: grid; padding: 14px; }
.drawer-nav a { padding: 11px 13px; border-radius: 10px; font-weight: 700; }
.drawer-nav a.active,
.drawer-nav a:hover { color: var(--red); background: var(--red-soft); }

@media (max-width: 1180px) {
    .site-layout { grid-template-columns: 190px minmax(0, 1fr); gap: 20px; }
    .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .nav-core { gap: 12px; }
}

@media (max-width: 980px) {
    :root { --header-h: 66px; }
    .header-inner { width: min(100% - 24px, 1440px); gap: 10px; }
    .menu-toggle { display: flex; }
    .nav-core { display: none; }
    .logo { margin-inline: auto; }
    .logo img { max-height: 46px; }
    .header-register { min-width: 70px; padding: 0 16px; }
    .site-layout { display: block; width: min(100% - 24px, 980px); padding-top: calc(var(--header-h) + 14px); }
    .side-category { display: none; }
    .channel-grid,
    .feature-grid,
    .product-grid,
    .mixed-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .brand-intro,
    .page-hero,
    .split-section,
    .home-feature { grid-template-columns: 1fr; }
    .page-hero-media { order: -1; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .mobile-bottom-nav {
        position: fixed;
        z-index: 1050;
        left: 10px;
        right: 10px;
        bottom: max(10px, env(safe-area-inset-bottom));
        height: 58px;
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        background: rgba(255,255,255,.97);
        border: 1px solid rgba(201,0,0,.12);
        border-radius: 18px;
        box-shadow: 0 14px 30px rgba(17,21,28,.18);
        overflow: hidden;
    }
    .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 1px;
        color: var(--muted);
        font-size: 12px;
        font-weight: 800;
    }
    .mobile-bottom-nav a span { font-size: 18px; line-height: 1; }
    .mobile-bottom-nav a.active { color: var(--red); background: var(--red-soft); }
    body { padding-bottom: 82px; }
}

@media (max-width: 640px) {
    .section-block { padding: 24px 18px; border-radius: 18px; }
    .banner-slider { height: clamp(150px, 48vw, 210px); border-radius: 16px; margin-bottom: 22px; }
    .slider-prev, .slider-next { width: 36px; height: 36px; margin-top: -18px; font-size: 21px; }
    .slider-prev { left: 8px; }
    .slider-next { right: 8px; }
    h1 { font-size: 31px; }
    h2 { font-size: 24px; }
    .channel-grid,
    .feature-grid,
    .product-grid,
    .summary-grid,
    .review-grid,
    .mixed-grid,
    .contact-grid { grid-template-columns: 1fr; }
    .brand-intro-media img,
    .page-hero-media img,
    .split-media img,
    .home-feature-media img { height: 210px; }
    .product-card img,
    .zone-card img { height: 150px; }
    .step-list li { grid-template-columns: 1fr; gap: 4px; }
    .service-note,
    .compliance-box { align-items: flex-start; flex-direction: column; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; }
}