:root {
    --ink: #101828;
    --muted: #526174;
    --line: #dbe3ed;
    --soft: #f3f7fb;
    --white: #ffffff;
    --blue: #0b68f0;
    --blue-dark: #0752bd;
    --blue-soft: #eaf3ff;
    --focus: #ffbf47;
    --radius: 8px;
    --shadow: 0 16px 44px rgba(16, 39, 70, .10);
    --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    background: var(--white);
    font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    letter-spacing: 0;
    -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.article-container { max-width: 820px; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 1000; padding: 10px 16px; background: var(--ink); color: white; border-radius: 4px; }
.skip-link:focus { top: 12px; }

.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.96); border-bottom: 1px solid rgba(219,227,237,.85); backdrop-filter: blur(12px); }
.nav-wrap { min-height: 72px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 10px; min-width: max-content; }
.brand > span:last-child { display: flex; flex-direction: column; line-height: 1.05; }
.brand strong { font-size: 18px; }
.brand small { margin-top: 5px; color: var(--muted); font-size: 11px; }
.brand-mark { width: 34px; height: 34px; display: flex; align-items: flex-end; justify-content: center; gap: 3px; padding: 7px; border-radius: 7px; background: var(--blue); }
.brand-mark i { display: block; width: 4px; border-radius: 2px; background: white; }
.brand-mark i:nth-child(1) { height: 7px; }
.brand-mark i:nth-child(2) { height: 13px; }
.brand-mark i:nth-child(3) { height: 19px; }
.site-nav { display: flex; align-items: center; justify-content: center; gap: 26px; white-space: nowrap; }
.site-nav a { color: #344054; font-size: 15px; font-weight: 700; }
.site-nav a:hover { color: var(--blue); }
.header-cta { min-height: 42px; display: inline-flex; align-items: center; justify-content: center; padding: 0 19px; color: white; background: var(--blue); border-radius: 6px; font-size: 14px; font-weight: 800; white-space: nowrap; }
.header-cta:hover { background: var(--blue-dark); }
.nav-toggle { display: none; width: 44px; height: 44px; padding: 10px; border: 0; background: transparent; }
.nav-toggle span { display: block; width: 23px; height: 2px; margin: 5px auto; background: var(--ink); }

.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 22px; border: 1px solid transparent; border-radius: 6px; font-weight: 800; line-height: 1.25; white-space: nowrap; transition: background-color .2s ease, color .2s ease, transform .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--blue); color: white; }
.button-primary:hover { background: var(--blue-dark); }
.button-secondary { background: var(--ink); color: white; }
.button-secondary:hover { background: #273549; }
.button-outline { border-color: #b9c7d8; background: white; color: var(--ink); }
.button-outline:hover { border-color: var(--blue); color: var(--blue); }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--blue-dark); font-weight: 800; }
.text-link span { transition: transform .2s ease; }
.text-link:hover span { transform: translateX(4px); }
.eyebrow { margin: 0 0 14px; color: var(--blue-dark); font-size: 13px; font-weight: 900; text-transform: uppercase; }

.hero { overflow: hidden; background: var(--soft); border-bottom: 1px solid var(--line); }
.hero-grid { min-height: min(720px, calc(100dvh - 72px)); display: grid; grid-template-columns: minmax(0, 1.03fr) minmax(420px, .97fr); align-items: center; gap: 64px; padding-block: 56px; }
.hero-copy h1 { max-width: 700px; margin: 0; font-size: clamp(42px, 5.3vw, 76px); line-height: 1.08; letter-spacing: 0; }
.hero-copy h1 strong { color: var(--blue); font-weight: 900; }
.hero-lead { max-width: 620px; margin: 24px 0 0; color: var(--muted); font-size: 19px; line-height: 1.8; }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 34px; }
.hero-visual { position: relative; min-height: 520px; }
.hero-image { position: absolute; overflow: hidden; background: white; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-image img { width: 100%; height: 100%; object-fit: cover; }
.hero-image-main { inset: 0 6% 6% 10%; transform: rotate(1.5deg); }
.hero-image-small { width: 40%; aspect-ratio: 1; right: 0; bottom: 0; transform: rotate(-4deg); }
.hero-fact { position: absolute; left: 0; bottom: 24px; display: flex; align-items: center; gap: 10px; padding: 13px 16px; background: var(--ink); color: white; border-radius: 6px; box-shadow: var(--shadow); }
.hero-fact strong { font-size: 28px; line-height: 1; }
.hero-fact span { max-width: 72px; color: #d8e2ee; font-size: 12px; line-height: 1.25; }

.trust-band { border-bottom: 1px solid var(--line); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-grid > div { min-height: 108px; display: flex; flex-direction: column; justify-content: center; padding: 22px 26px; border-right: 1px solid var(--line); }
.trust-grid > div:first-child { border-left: 1px solid var(--line); }
.trust-grid strong { font-size: 16px; }
.trust-grid span { color: var(--muted); font-size: 13px; }

.section { padding-block: 92px; }
.section-heading { max-width: 760px; margin-bottom: 42px; }
.section-heading.narrow { max-width: 560px; }
.section-heading h2, .scenario-intro h2, .faq-layout h2 { margin: 0; font-size: clamp(32px, 4vw, 52px); line-height: 1.18; }
.section-heading > p:last-child, .scenario-intro > p { color: var(--muted); max-width: 680px; margin: 16px 0 0; }
.section-more { display: flex; justify-content: center; margin-top: 36px; }

.section-products { background: white; }
.product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.product-card { min-width: 0; display: grid; grid-template-columns: 44% 56%; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: white; transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease; }
.product-card:hover { transform: translateY(-4px); border-color: #aac4e9; box-shadow: var(--shadow); }
.product-image { aspect-ratio: 1 / 1.12; overflow: hidden; background: var(--blue-soft); }
.product-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.product-card:hover .product-image img { transform: scale(1.025); }
.product-body { min-width: 0; display: flex; flex-direction: column; padding: 22px; }
.product-topline { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--muted); font-size: 10px; }
.product-topline span:first-child { color: var(--blue-dark); font-weight: 900; }
.product-body h3 { margin: 12px 0 7px; font-size: 21px; line-height: 1.35; }
.product-body h3 a:hover { color: var(--blue); }
.product-body > p { margin: 0 0 14px; color: var(--muted); font-size: 13px; line-height: 1.65; }
.product-specs { margin: 0; }
.product-specs div { display: grid; grid-template-columns: 45px 1fr; gap: 8px; padding: 6px 0; font-size: 12px; }
.product-specs dt { color: var(--muted); }
.product-specs dd { margin: 0; font-weight: 700; }
.product-action { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-top: auto; padding-top: 16px; }
.price { display: flex; flex-direction: column; }
.price small { color: var(--muted); font-size: 10px; line-height: 1.3; }
.price strong { margin-top: 2px; font-size: 31px; line-height: 1; }
.price strong span { margin-right: 2px; font-size: 15px; }
.product-action .button { min-height: 40px; padding: 8px 14px; font-size: 13px; }

.scenario-section { background: var(--soft); border-block: 1px solid var(--line); }
.scenario-grid { display: grid; grid-template-columns: .78fr 1.22fr; gap: 84px; align-items: start; }
.scenario-intro { position: sticky; top: 120px; }
.scenario-intro .text-link { margin-top: 26px; }
.scenario-list { border-top: 1px solid #bfcbd9; }
.scenario-list article { min-height: 150px; display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 24px; padding: 28px 0; border-bottom: 1px solid #bfcbd9; }
.scenario-list article > span { color: var(--blue); font-weight: 900; }
.scenario-list h3 { margin: 0; font-size: 24px; }
.scenario-list p { margin: 5px 0 0; color: var(--muted); font-size: 14px; }
.scenario-list article > a { min-width: 54px; text-align: right; color: var(--blue-dark); font-weight: 900; }

.compare-band { background: var(--ink); color: white; }
.compare-band .section-heading { margin-bottom: 54px; }
.check-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border-top: 1px solid #3b4a5f; border-bottom: 1px solid #3b4a5f; }
.check-grid > div { min-height: 240px; padding: 28px 24px; border-right: 1px solid #3b4a5f; }
.check-grid > div:first-child { border-left: 1px solid #3b4a5f; }
.check-grid b { display: block; color: #78afff; font-size: 14px; }
.check-grid h3 { margin: 48px 0 10px; font-size: 19px; }
.check-grid p { margin: 0; color: #b7c2d1; font-size: 13px; }

.editorial-section { background: white; }
.article-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 22px; }
.article-card { min-height: 290px; display: flex; flex-direction: column; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); }
.article-card:nth-child(1), .article-card:nth-child(4) { grid-column: span 7; }
.article-card:nth-child(2), .article-card:nth-child(3) { grid-column: span 5; }
.article-card > p { margin: 0; color: var(--blue-dark); font-size: 12px; font-weight: 900; }
.article-card h3 { margin: 20px 0 12px; font-size: 26px; line-height: 1.3; }
.article-card h3 a:hover { color: var(--blue); }
.article-card > span { color: var(--muted); font-size: 14px; }
.article-card .text-link { margin-top: auto; padding-top: 28px; }

.faq-preview { background: var(--soft); border-top: 1px solid var(--line); }
.faq-layout { display: grid; grid-template-columns: .78fr 1.22fr; gap: 84px; }
.faq-layout > div:first-child .text-link { margin-top: 26px; }
.faq-list details, .faq-page-list details { border-top: 1px solid #bdc9d8; }
.faq-list details:last-child, .faq-page-list details:last-child { border-bottom: 1px solid #bdc9d8; }
.faq-list summary, .faq-page-list summary { position: relative; cursor: pointer; list-style: none; padding: 22px 46px 22px 0; font-size: 18px; font-weight: 800; }
.faq-list summary::-webkit-details-marker, .faq-page-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after, .faq-page-list summary::after { content: "+"; position: absolute; right: 6px; top: 50%; transform: translateY(-50%); color: var(--blue); font-size: 26px; font-weight: 400; }
.faq-list details[open] summary::after, .faq-page-list details[open] summary::after { content: "−"; }
.faq-list details p, .faq-page-list details p { margin: -4px 0 22px; padding-right: 42px; color: var(--muted); }

.page-hero { padding: 44px 0 68px; background: var(--soft); border-bottom: 1px solid var(--line); }
.page-hero h1 { max-width: 860px; margin: 20px 0 14px; font-size: clamp(42px, 6vw, 72px); line-height: 1.08; }
.page-hero > .container > p:last-child { max-width: 700px; color: var(--muted); font-size: 18px; }
.page-hero-products { padding-bottom: 0; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 0; margin: 0 0 30px; list-style: none; }
.breadcrumbs li { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 12px; }
.breadcrumbs a:hover { color: var(--blue); }
.filter-bar { display: flex; gap: 4px; margin-top: 42px; }
.filter-bar button { min-height: 48px; padding: 8px 22px; border: 1px solid var(--line); border-bottom: 0; border-radius: 6px 6px 0 0; background: white; color: var(--muted); cursor: pointer; font-weight: 800; }
.filter-bar button.is-active { background: var(--blue); color: white; border-color: var(--blue); }
.product-catalog { padding-top: 58px; }
.product-catalog [data-category][hidden] { display: none; }
.product-catalog .product-grid > div { min-width: 0; }
.product-catalog .product-card { height: 100%; }
.product-table-section { padding-top: 30px; background: var(--soft); border-top: 1px solid var(--line); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: white; }
table { width: 100%; border-collapse: collapse; min-width: 740px; }
th, td { padding: 18px 20px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
thead th { background: #eaf0f7; color: #42526a; font-size: 12px; }
tbody th { font-size: 14px; }
tbody th a { color: var(--blue-dark); }
td { color: var(--muted); font-size: 14px; }
tr:last-child th, tr:last-child td { border-bottom: 0; }
.disclosure-band { padding: 34px 0; border-block: 1px solid #b9d4f7; background: var(--blue-soft); }
.disclosure-band .container { display: grid; grid-template-columns: 180px 1fr; gap: 30px; }
.disclosure-band p { margin: 0; color: #3f5874; }

.product-detail-hero { padding: 42px 0 76px; background: var(--soft); border-bottom: 1px solid var(--line); }
.product-detail-grid { display: grid; grid-template-columns: minmax(360px, .9fr) minmax(0, 1.1fr); gap: 72px; align-items: center; }
.detail-image { overflow: hidden; aspect-ratio: 1; border: 1px solid var(--line); border-radius: var(--radius); background: white; box-shadow: var(--shadow); }
.detail-image img { width: 100%; height: 100%; object-fit: cover; }
.detail-copy h1 { margin: 0; font-size: clamp(38px, 5vw, 64px); line-height: 1.1; }
.detail-lead { max-width: 620px; margin: 20px 0 26px; color: var(--muted); font-size: 18px; }
.detail-facts { margin: 26px 0 0; border-top: 1px solid #bdc9d8; }
.detail-facts div { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 14px 0; border-bottom: 1px solid #bdc9d8; }
.detail-facts dt { color: var(--muted); }
.detail-facts dd { margin: 0; font-weight: 800; }
.detail-buy { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-top: 28px; }
.detail-buy .price strong { font-size: 46px; }
.partner-hint { margin: 14px 0 0; color: var(--muted); font-size: 12px; }
.detail-content { background: white; }
.detail-columns { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 84px; }
.detail-columns article h2 { margin: 54px 0 18px; font-size: 32px; line-height: 1.25; }
.detail-columns article h2:first-child { margin-top: 0; }
.detail-columns article p { color: #3f4e60; }
.feature-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding: 0; list-style: none; }
.feature-list li { min-height: 96px; display: flex; align-items: flex-end; padding: 16px; border: 1px solid var(--line); border-radius: 6px; font-weight: 800; }
.plan-list { border-top: 1px solid var(--line); }
.plan-list div { padding: 15px 4px; border-bottom: 1px solid var(--line); }
.notice-box { margin-top: 22px; padding: 20px 22px; border-left: 4px solid var(--blue); background: var(--blue-soft); }
.notice-box p { margin: 6px 0 0; }
.detail-aside { position: sticky; top: 110px; align-self: start; padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--soft); }
.detail-aside h2 { margin: 0; font-size: 21px; }
.detail-aside ol { padding-left: 22px; color: var(--muted); }
.detail-aside .button { width: 100%; margin-top: 10px; }
.next-section { padding: 70px 0; background: var(--ink); color: white; text-align: center; }
.next-section p { margin: 0; color: #b7c2d1; }
.next-section h2 { margin: 6px 0 24px; font-size: 36px; }

.guide-header { padding: 42px 0 66px; background: var(--soft); border-bottom: 1px solid var(--line); }
.guide-header h1 { margin: 16px 0 20px; font-size: clamp(40px, 5.5vw, 66px); line-height: 1.12; }
.guide-dek { margin: 0; color: var(--muted); font-size: 19px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 28px; color: var(--muted); font-size: 12px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 760px) 230px; gap: 80px; padding-block: 72px 100px; }
.article-body { min-width: 0; color: #29384a; font-size: 17px; line-height: 1.9; }
.article-body p { margin: 0 0 23px; }
.article-body a { color: var(--blue-dark); text-decoration: underline; text-underline-offset: 3px; }
.article-body h2 { scroll-margin-top: 100px; margin: 58px 0 20px; color: var(--ink); font-size: 34px; line-height: 1.3; }
.article-body h3 { margin: 34px 0 12px; color: var(--ink); font-size: 23px; }
.article-body ol, .article-body ul { padding-left: 24px; }
.article-body li { margin-bottom: 10px; }
.article-intro { padding-left: 22px; border-left: 4px solid var(--blue); color: var(--ink); font-size: 20px; font-weight: 700; }
.toc { display: grid; gap: 7px; margin: 34px 0 44px; padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--soft); }
.toc strong { margin-bottom: 5px; }
.toc a { text-decoration: none; }
.article-callout { margin: 34px 0; padding: 24px 26px; border: 1px solid #b9d4f7; border-radius: var(--radius); background: var(--blue-soft); }
.article-callout p { margin: 6px 0 0; }
.comparison-block { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 28px 0; }
.comparison-block > div { padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); }
.comparison-block h3 { margin-top: 0; }
.comparison-block p { margin-bottom: 0; font-size: 14px; }
.numbered-steps { border-top: 1px solid var(--line); }
.numbered-steps section { display: grid; grid-template-columns: 50px 1fr; gap: 20px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.numbered-steps b { color: var(--blue); }
.numbered-steps h3 { margin: 0 0 5px; }
.numbered-steps p { margin: 0; }
.plan-checklist { margin: 40px 0; padding: 28px; border-radius: var(--radius); background: var(--ink); color: white; }
.plan-checklist h2 { margin-top: 0; color: white; }
.plan-checklist p { margin-bottom: 0; color: #d0d9e5; }
.type-comparison { display: grid; gap: 22px; }
.type-comparison section { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); }
.type-comparison section h2 { margin-top: 0; }
.type-comparison dl { display: grid; grid-template-columns: repeat(2, 1fr); margin: 18px 0 0; }
.type-comparison dl div { border-top: 1px solid var(--line); padding-top: 10px; }
.type-comparison dt { color: var(--muted); font-size: 12px; }
.type-comparison dd { margin: 3px 0 0; font-weight: 800; }
.article-aside { align-self: start; position: sticky; top: 112px; }
.article-aside > div { display: flex; flex-direction: column; gap: 10px; padding-left: 20px; border-left: 1px solid var(--line); }
.article-aside strong { margin-bottom: 8px; }
.article-aside a { color: var(--muted); font-size: 13px; }
.article-aside a:hover { color: var(--blue); }
.faq-page-list { max-width: 900px; }
.faq-page-list summary { font-size: 20px; padding-block: 26px; }
.prose-static { color: #334155; font-size: 17px; }
.prose-static h2 { margin: 44px 0 14px; color: var(--ink); font-size: 30px; }
.prose-static h2:first-child { margin-top: 0; }
.not-found { min-height: 65dvh; display: grid; place-items: center; text-align: center; }
.not-found p { margin: 0; color: var(--blue); font-size: 70px; font-weight: 900; }
.not-found h1 { margin: 0; font-size: 42px; }
.not-found span { display: block; margin: 12px 0 26px; color: var(--muted); }

.site-footer { padding: 68px 0 28px; background: #0b1421; color: white; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 64px; }
.brand-footer { color: white; }
.brand-footer small { color: #a9b7c8; }
.footer-brand p { max-width: 320px; color: #a9b7c8; font-size: 13px; }
.footer-grid h2 { margin: 0 0 14px; color: #dce5ef; font-size: 13px; }
.footer-grid > div:not(:first-child) { display: flex; flex-direction: column; gap: 8px; }
.footer-grid > div:not(:first-child) a { color: #a9b7c8; font-size: 13px; }
.footer-grid a:hover { color: white; }
.footer-note { display: flex; justify-content: space-between; gap: 40px; margin-top: 52px; padding-top: 22px; border-top: 1px solid #2a394a; color: #8291a4; font-size: 11px; }
.footer-note p { margin: 0; }
.footer-note p:first-child { max-width: 780px; }
.footer-note a { color: inherit; }
.footer-note a:hover { color: white; }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

@media (max-width: 980px) {
    .container { width: min(calc(100% - 32px), var(--container)); }
    .nav-wrap { grid-template-columns: auto 1fr auto; }
    .site-nav { position: absolute; top: 72px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 10px 16px 20px; background: white; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
    .site-nav.is-open { display: flex; }
    .site-nav a { padding: 13px 8px; border-bottom: 1px solid var(--line); }
    .nav-toggle { display: block; justify-self: end; }
    .header-cta { display: none; }
    .hero-grid { min-height: auto; grid-template-columns: 1fr; gap: 44px; padding-block: 54px; }
    .hero-copy h1 { font-size: 58px; }
    .hero-visual { min-height: 560px; max-width: 650px; width: 100%; margin-inline: auto; }
    .trust-grid { grid-template-columns: repeat(2, 1fr); }
    .trust-grid > div:nth-child(3) { border-left: 1px solid var(--line); border-top: 1px solid var(--line); }
    .trust-grid > div:nth-child(4) { border-top: 1px solid var(--line); }
    .product-card { grid-template-columns: 1fr; }
    .product-image { aspect-ratio: 1.45; }
    .scenario-grid, .faq-layout { grid-template-columns: 1fr; gap: 42px; }
    .scenario-intro { position: static; }
    .check-grid { grid-template-columns: repeat(2, 1fr); }
    .check-grid > div { border-bottom: 1px solid #3b4a5f; }
    .check-grid > div:nth-child(odd) { border-left: 1px solid #3b4a5f; }
    .product-detail-grid { grid-template-columns: .9fr 1.1fr; gap: 38px; }
    .detail-columns { grid-template-columns: 1fr; gap: 50px; }
    .detail-aside { position: static; }
    .article-layout { grid-template-columns: minmax(0, 1fr); }
    .article-aside { display: none; }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
    .footer-grid > div:last-child { grid-column: 2 / 4; }
}

@media (max-width: 680px) {
    body { font-size: 15px; }
    .container { width: min(calc(100% - 28px), var(--container)); }
    .site-header, .nav-wrap { min-height: 64px; }
    .site-nav { top: 64px; }
    .brand strong { font-size: 16px; }
    .brand-mark { width: 32px; height: 32px; }
    .hero-grid { padding-block: 42px 34px; gap: 32px; }
    .hero-copy h1 { font-size: 42px; }
    .hero-lead { font-size: 16px; }
    .hero-actions { align-items: stretch; flex-direction: column; gap: 16px; margin-top: 28px; }
    .hero-actions .button { width: 100%; }
    .hero-actions .text-link { justify-content: center; }
    .hero-visual { min-height: 255px; overflow: hidden; }
    .hero-image-main { inset: 0 4% 4% 4%; }
    .hero-image-small { width: 38%; }
    .hero-fact { left: 2px; bottom: 10px; }
    .trust-grid { grid-template-columns: 1fr; }
    .trust-grid > div, .trust-grid > div:first-child, .trust-grid > div:nth-child(3) { min-height: 90px; border-left: 1px solid var(--line); border-top: 1px solid var(--line); }
    .trust-grid > div:first-child { border-top: 0; }
    .section { padding-block: 62px; }
    .section-heading { margin-bottom: 30px; }
    .section-heading h2, .scenario-intro h2, .faq-layout h2 { font-size: 34px; }
    .product-grid { grid-template-columns: 1fr; gap: 18px; }
    .product-image { aspect-ratio: 1.12; }
    .product-body { padding: 20px; }
    .scenario-list article { grid-template-columns: 34px 1fr; gap: 12px; }
    .scenario-list article > a { grid-column: 2; text-align: left; }
    .check-grid { grid-template-columns: 1fr; }
    .check-grid > div, .check-grid > div:nth-child(odd) { min-height: 180px; border-left: 1px solid #3b4a5f; }
    .check-grid h3 { margin-top: 24px; }
    .article-grid { grid-template-columns: 1fr; }
    .article-card:nth-child(n) { grid-column: auto; min-height: 260px; }
    .page-hero { padding: 30px 0 50px; }
    .page-hero h1 { font-size: 42px; }
    .filter-bar { overflow-x: auto; padding-bottom: 1px; }
    .filter-bar button { flex: 0 0 auto; padding-inline: 18px; }
    .disclosure-band .container { grid-template-columns: 1fr; gap: 8px; }
    .product-detail-hero { padding: 28px 0 54px; }
    .product-detail-grid { grid-template-columns: 1fr; gap: 34px; }
    .detail-copy h1 { font-size: 40px; }
    .detail-facts div { grid-template-columns: 95px 1fr; }
    .detail-buy { display: grid; grid-template-columns: auto minmax(160px, 1fr); align-items: end; }
    .detail-buy .button { width: 100%; }
    .feature-list { grid-template-columns: 1fr; }
    .feature-list li { min-height: 70px; }
    .guide-header { padding: 28px 0 50px; }
    .guide-header h1 { font-size: 40px; }
    .guide-dek { font-size: 16px; }
    .article-layout { padding-block: 52px 70px; }
    .article-body { font-size: 16px; }
    .article-body h2 { font-size: 28px; }
    .article-intro { font-size: 18px; }
    .comparison-block { grid-template-columns: 1fr; }
    .type-comparison dl { grid-template-columns: 1fr; gap: 12px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 38px 24px; }
    .footer-grid > div:first-child { grid-column: 1 / -1; }
    .footer-grid > div:last-child { grid-column: auto; }
    .footer-note { flex-direction: column; gap: 12px; }
}

/* Editorial refresh */
:root {
    --ink: #18212c;
    --muted: #5d6978;
    --line: #d9e0e7;
    --soft: #f5f7f9;
    --blue: #0868bd;
    --blue-dark: #07569c;
    --blue-soft: #edf5fc;
    --radius: 6px;
    --shadow: 0 12px 32px rgba(25, 48, 76, .08);
    --container: 1160px;
}

body {
    color: var(--ink);
    font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
    line-height: 1.68;
}

.site-header { background: rgba(255, 255, 255, .98); backdrop-filter: blur(8px); }
.nav-wrap { min-height: 66px; }
.brand-mark { width: 32px; height: 32px; border-radius: 5px; }
.site-nav { gap: 24px; }
.site-nav a { font-size: 14px; font-weight: 650; }
.header-cta { min-height: 38px; padding-inline: 17px; border-radius: 5px; }

.button { min-height: 44px; border-radius: 5px; font-weight: 700; }
.button:hover { transform: translateY(-1px); }
.eyebrow, .page-kicker {
    margin: 0 0 12px;
    color: var(--blue-dark);
    font-size: 13px;
    font-weight: 700;
}

.hero { background: #f7f9fb; }
.hero-grid {
    min-height: min(650px, calc(100dvh - 66px));
    grid-template-columns: minmax(0, 1fr) minmax(390px, 1fr);
    gap: 52px;
    padding-block: 58px;
}
.hero-copy h1 { max-width: 620px; font-size: clamp(42px, 4.2vw, 52px); line-height: 1.14; }
.hero-copy h1 strong { display: block; color: var(--blue-dark); }
.hero-lead { max-width: 560px; margin-top: 20px; font-size: 17px; line-height: 1.75; }
.hero-actions { margin-top: 30px; }
.hero-visual { min-height: 470px; }
.hero-image { border-radius: 4px; box-shadow: none; }
.hero-image-main { inset: 0 4% 5% 8%; transform: none; }
.hero-image-small { width: 34%; right: -1px; bottom: 0; transform: none; border: 6px solid #f7f9fb; }
.hero-fact { left: 0; bottom: 22px; border-radius: 4px; box-shadow: none; }

.trust-band { background: #fff; }
.trust-grid { grid-template-columns: repeat(3, 1fr); }
.trust-grid > div { min-height: 86px; padding: 18px 24px; }
.trust-grid strong { font-size: 15px; }
.trust-grid span { margin-top: 2px; }

.section { padding-block: 76px; }
.section-heading { margin-bottom: 34px; }
.section-heading h2, .scenario-intro h2, .faq-layout h2 { font-size: clamp(30px, 3.2vw, 42px); line-height: 1.22; }
.section-heading > p:last-child, .scenario-intro > p, .faq-layout > div:first-child > p { margin-top: 12px; }
.section-more { justify-content: flex-start; margin-top: 30px; }

.product-grid { gap: 18px; }
.product-card { border-radius: 5px; transition: border-color .18s ease, transform .18s ease; }
.product-card:hover { transform: translateY(-2px); border-color: #9ebbd4; box-shadow: none; }
.product-image { background: #f0f4f7; }
.product-body { padding: 20px; }
.product-body h3 { font-size: 20px; }
.product-topline { font-size: 11px; }

.scenario-section { background: #f6f8fa; }
.scenario-grid { grid-template-columns: .7fr 1.3fr; gap: 90px; }
.scenario-list article { min-height: 128px; grid-template-columns: 1fr auto; gap: 28px; padding: 25px 0; }
.scenario-list h3 { font-size: 21px; }
.scenario-list p { max-width: 610px; font-size: 14px; }

.article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 44px; border-top: 1px solid var(--line); }
.article-card, .article-card:nth-child(n) {
    grid-column: auto;
    min-height: 245px;
    padding: 28px 0;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
}
.article-card > p { color: var(--muted); font-weight: 600; }
.article-card h3 { margin: 14px 0 10px; font-size: 23px; }
.article-card .text-link { padding-top: 22px; }

.faq-preview { background: #f6f8fa; }
.faq-layout { grid-template-columns: .65fr 1.35fr; gap: 100px; }
.faq-layout > div:first-child > p { color: var(--muted); }
.faq-list summary, .faq-page-list summary { padding-block: 20px; font-size: 17px; font-weight: 700; }
.faq-list details p, .faq-page-list details p { max-width: 720px; margin-bottom: 20px; color: #536172; }

.page-hero, .guide-header {
    padding: 30px 0 40px;
    background: #f7f9fb;
    border-bottom: 1px solid var(--line);
}
.page-hero-products { padding-bottom: 0; }
.page-hero h1, .guide-header h1 {
    max-width: 820px;
    margin: 10px 0 12px;
    font-size: clamp(35px, 3.8vw, 44px);
    line-height: 1.18;
}
.page-hero > .container > p:last-child, .faq-heading > p:last-child, .guide-dek { max-width: 680px; font-size: 17px; }
.breadcrumbs ol { margin-bottom: 18px; }
.filter-bar { margin-top: 30px; gap: 0; }
.filter-bar button { min-height: 44px; padding-inline: 20px; border-radius: 0; }
.filter-bar button:first-child { border-radius: 5px 0 0 0; }
.filter-bar button:last-child { border-radius: 0 5px 0 0; }

.product-catalog { padding-top: 46px; }
.product-table-section { padding-top: 58px; }
.table-wrap { border-radius: 4px; }
.disclosure-band { background: #f4f7fa; border-color: var(--line); }

.product-detail-hero { padding: 34px 0 60px; background: #f7f9fb; }
.product-detail-grid { gap: 60px; }
.detail-image { border-radius: 4px; box-shadow: none; }
.detail-copy h1 { font-size: clamp(35px, 3.8vw, 44px); line-height: 1.16; }
.detail-lead { font-size: 17px; }
.detail-buy .button { min-width: 160px; }
.detail-columns { gap: 74px; }
.detail-columns article h2 { margin-top: 46px; font-size: 28px; }
.feature-list li { min-height: 82px; border-radius: 4px; }
.product-highlights { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin: 0; padding: 0; list-style: none; }
.product-highlights li { min-height: 72px; padding-top: 16px; border-top: 2px solid var(--ink); font-weight: 700; }
.detail-aside { padding: 24px; border-radius: 4px; }
.next-section { padding: 54px 0; background: #18212c; }
.next-section h2 { font-size: 30px; }

.guide-heading, .faq-heading { max-width: 720px; }
.guide-header h1 { max-width: 720px; margin-block: 8px 12px; font-size: clamp(35px, 3.5vw, 42px); }
.article-meta { gap: 18px; margin-top: 22px; }
.article-meta span + span::before { content: "/"; margin-right: 18px; color: #a0a9b4; }
.article-layout { grid-template-columns: minmax(0, 720px) 190px; gap: 96px; padding-block: 48px 92px; }
.article-body { color: #303d4c; font-size: 16.5px; line-height: 1.86; }
.article-body p { margin-bottom: 20px; }
.article-body h2 { margin: 50px 0 16px; font-size: 28px; line-height: 1.35; }
.article-body h3 { margin: 0 0 8px; font-size: 20px; }
.article-intro { padding: 0; border: 0; color: #243140; font-size: 19px; font-weight: 500; line-height: 1.75; }
.toc {
    grid-template-columns: 120px 1fr 1fr;
    gap: 8px 22px;
    margin: 32px 0 46px;
    padding: 20px 0;
    border: 0;
    border-block: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
}
.toc strong { grid-row: span 2; margin: 0; }
.toc a { color: #3f566d; font-size: 14px; }
.article-note, .message-template {
    margin: 30px 0;
    padding: 20px 22px;
    border-left: 3px solid var(--blue);
    background: var(--blue-soft);
}
.article-note p, .message-template p { margin: 5px 0 0; }
.article-table { margin: 26px 0 30px; }
.article-table table { min-width: 600px; }
.article-table th, .article-table td { padding: 15px 17px; }
.article-table thead th { background: #eef2f5; }
.device-comparison { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 28px 0 34px; }
.device-comparison section { padding-top: 18px; border-top: 2px solid var(--ink); }
.device-comparison p { color: var(--muted); font-size: 14px; }
.device-comparison a { font-size: 14px; font-weight: 700; }
.question-sheet { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 30px; margin: 26px 0 34px; border-top: 1px solid var(--line); }
.question-sheet div { display: grid; grid-template-columns: 92px 1fr; gap: 14px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.question-sheet span { color: var(--muted); }
.test-steps { margin: 20px 0 28px; padding-left: 22px; }
.test-steps li { padding-left: 5px; }
.diagnostic-groups { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 34px; margin: 22px 0 38px; border-top: 1px solid var(--line); }
.diagnostic-groups section { padding: 22px 0 4px; border-bottom: 1px solid var(--line); }
.diagnostic-groups p { color: var(--muted); font-size: 15px; }
.plan-terms table { min-width: 700px; }
.message-template { background: #f2f5f7; border-left-color: #6f7d8d; }
.article-aside > div { gap: 12px; padding-left: 18px; }
.article-aside a { font-size: 14px; }

.detail-related { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 42px; padding-block: 18px; border-block: 1px solid var(--line); }
.detail-related strong { width: 100%; }
.detail-related a { color: var(--blue-dark); font-size: 14px; font-weight: 700; }
.source-line { margin: 18px 0 0 !important; color: var(--muted) !important; font-size: 12px; }

.topic-preview { background: #fff; border-top: 1px solid var(--line); }
.topic-preview-grid { display: grid; grid-template-columns: .62fr 1.38fr; gap: 90px; align-items: start; }
.topic-preview-intro { position: sticky; top: 106px; }
.topic-preview-intro h2 { margin: 0; font-size: clamp(30px, 3.2vw, 42px); line-height: 1.22; }
.topic-preview-intro > p { color: var(--muted); }
.topic-preview-intro > .text-link { margin-top: 26px; }
.tag-shortcuts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.tag-shortcuts a { padding: 7px 11px; border: 1px solid var(--line); border-radius: 4px; color: #435264; font-size: 13px; }
.tag-shortcuts a:hover { border-color: var(--blue); color: var(--blue-dark); }
.topic-preview-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 34px; border-top: 1px solid var(--line); }
.topic-preview-list article { min-height: 188px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.topic-preview-list article > span { color: var(--blue-dark); font-size: 12px; font-weight: 700; }
.topic-preview-list h3 { margin: 8px 0 7px; font-size: 19px; line-height: 1.4; }
.topic-preview-list h3 a:hover { color: var(--blue-dark); }
.topic-preview-list p { margin: 0; color: var(--muted); font-size: 13px; }

.topic-hub-hero h1 { max-width: 900px; }
.topic-directory { padding-top: 56px; }
.topic-group-block { padding: 52px 0; border-top: 1px solid var(--line); }
.topic-group-block:first-child { padding-top: 0; border-top: 0; }
.topic-group-block > header { display: grid; grid-template-columns: minmax(0, 680px) auto; justify-content: space-between; gap: 40px; align-items: end; margin-bottom: 28px; }
.topic-group-block > header h2 { margin: 0; font-size: 30px; }
.topic-group-block > header p { margin: 8px 0 0; color: var(--muted); }
.topic-group-block > header > a { color: var(--blue-dark); font-size: 14px; font-weight: 700; }
.topic-link-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 42px; border-top: 1px solid var(--line); }
.topic-link-list article { position: relative; min-height: 170px; padding: 23px 70px 23px 0; border-bottom: 1px solid var(--line); }
.topic-link-list h3 { margin: 0 0 8px; font-size: 20px; }
.topic-link-list p { margin: 0; color: var(--muted); font-size: 14px; }
.topic-link-list article > a { position: absolute; right: 0; top: 24px; color: var(--blue-dark); font-size: 13px; font-weight: 700; }

.tag-hero > .container > p:last-child { max-width: 720px; }
.tag-page { padding-top: 54px; }
.tag-page-layout { display: grid; grid-template-columns: 190px minmax(0, 760px); gap: 88px; }
.tag-page-nav { position: sticky; top: 100px; align-self: start; display: flex; flex-direction: column; padding-left: 18px; border-left: 1px solid var(--line); }
.tag-page-nav strong { margin-bottom: 8px; }
.tag-page-nav a { padding-block: 6px; color: var(--muted); font-size: 14px; }
.tag-page-nav a[aria-current="page"] { color: var(--blue-dark); font-weight: 700; }
.tag-topic-list { border-top: 1px solid var(--line); }
.tag-topic-list article { padding: 28px 0 30px; border-bottom: 1px solid var(--line); }
.tag-topic-list h2 { margin: 0 0 8px; font-size: 24px; }
.tag-topic-list p { margin: 0 0 18px; color: var(--muted); }
.tag-topic-list .text-link { font-size: 14px; }

.topic-toc { grid-template-columns: 110px repeat(3, minmax(0, 1fr)); align-items: start; }
.topic-toc strong { grid-row: auto; }
.topic-points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 28px; margin: 18px 0 30px; padding: 0; list-style: none; }
.topic-points li { position: relative; margin: 0; padding: 9px 0 9px 18px; border-bottom: 1px solid var(--line); }
.topic-points li::before { content: ""; position: absolute; left: 0; top: 19px; width: 6px; height: 6px; border-radius: 50%; background: var(--blue); }
.related-reading { margin-top: 54px; padding-top: 26px; border-top: 2px solid var(--ink); }
.related-reading h2 { margin: 0 0 16px; font-size: 24px; }
.related-reading > div { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 28px; }
.related-reading a { padding: 9px 0; border-bottom: 1px solid var(--line); color: var(--blue-dark); text-decoration: none; font-weight: 700; }

.faq-page { padding-top: 56px; }
.faq-page-layout { display: grid; grid-template-columns: 190px minmax(0, 720px); gap: 96px; }
.faq-index { position: sticky; top: 100px; align-self: start; display: flex; flex-direction: column; border-left: 1px solid var(--line); }
.faq-index a { padding: 7px 0 7px 18px; color: var(--muted); font-size: 14px; }
.faq-index a:hover { color: var(--blue-dark); }
.faq-page-list { max-width: none; }
.faq-group { scroll-margin-top: 100px; margin-bottom: 54px; }
.faq-group h2 { margin: 0 0 12px; font-size: 26px; }
.faq-group details:first-of-type { border-top-color: #aeb8c4; }

@media (max-width: 1180px) {
    .hero-grid { grid-template-columns: 1fr; gap: 36px; }
    .hero-copy h1 { font-size: 44px; }
    .hero-visual { min-height: 390px; }
    .trust-grid { grid-template-columns: repeat(3, 1fr); }
    .trust-grid > div:nth-child(3) { border-top: 0; }
    .scenario-grid, .faq-layout { grid-template-columns: 1fr; gap: 52px; }
    .scenario-intro { position: static; }
    .product-detail-grid { grid-template-columns: minmax(0, 1fr); }
    .detail-columns { grid-template-columns: minmax(0, 1fr); gap: 46px; }
    .detail-aside { position: static; }
    .article-layout { grid-template-columns: minmax(0, 1fr); gap: 0; }
    .article-aside { display: none; }
    .faq-page-layout { grid-template-columns: 150px minmax(0, 1fr); gap: 50px; }
    .topic-preview-grid { grid-template-columns: 1fr; gap: 38px; }
    .topic-preview-intro { position: static; }
    .tag-page-layout { grid-template-columns: 150px minmax(0, 1fr); gap: 48px; }
}

@media (max-width: 680px) {
    .site-header, .nav-wrap { min-height: 64px; }
    .hero-grid { padding-block: 38px 30px; }
    .hero-copy h1 { font-size: 38px; }
    .hero-lead { font-size: 16px; }
    .hero-visual { min-height: 280px; }
    .hero-image-main { inset: 0 5% 4% 5%; }
    .hero-image-small { width: 36%; }
    .trust-grid { grid-template-columns: 1fr; }
    .trust-grid > div, .trust-grid > div:first-child, .trust-grid > div:nth-child(3) { min-height: 76px; border-top: 1px solid var(--line); }
    .trust-grid > div:first-child { border-top: 0; }
    .section { padding-block: 54px; }
    .section-heading h2, .scenario-intro h2, .faq-layout h2 { font-size: 30px; }
    .scenario-list article { grid-template-columns: 1fr auto; }
    .scenario-list article > a { grid-column: auto; text-align: right; }
    .article-grid { grid-template-columns: 1fr; }
    .article-card, .article-card:nth-child(n) { min-height: 220px; }
    .page-hero, .guide-header { padding: 24px 0 34px; }
    .page-hero h1, .guide-header h1 { font-size: 32px; }
    .page-hero > .container > p:last-child, .guide-dek { font-size: 16px; }
    .filter-bar { margin-top: 24px; }
    .product-detail-hero { padding: 24px 0 46px; }
    .detail-copy h1 { font-size: 32px; }
    .article-layout { padding-block: 42px 66px; }
    .article-body { font-size: 16px; }
    .article-body h2 { margin-top: 42px; font-size: 25px; }
    .article-intro { font-size: 17px; }
    .toc { grid-template-columns: 1fr; gap: 7px; padding-block: 16px; }
    .toc strong { grid-row: auto; margin-bottom: 3px; }
    .device-comparison, .question-sheet, .diagnostic-groups { grid-template-columns: 1fr; }
    .question-sheet div { grid-template-columns: 82px 1fr; }
    .faq-page-layout { grid-template-columns: 1fr; gap: 34px; }
    .faq-index { position: static; flex-direction: row; flex-wrap: wrap; gap: 8px; border: 0; }
    .faq-index a { padding: 8px 12px; border: 1px solid var(--line); border-radius: 4px; background: white; }
    .faq-group { margin-bottom: 42px; }
    .faq-group h2 { font-size: 23px; }
    .product-highlights { grid-template-columns: 1fr; gap: 10px; }
    .product-highlights li { min-height: auto; padding-bottom: 12px; }
    .topic-preview-list, .topic-link-list { grid-template-columns: 1fr; }
    .topic-preview-list article { min-height: auto; }
    .topic-group-block { padding-block: 40px; }
    .topic-group-block > header { grid-template-columns: 1fr; gap: 14px; align-items: start; }
    .topic-group-block > header h2 { font-size: 26px; }
    .topic-link-list article { min-height: auto; padding-right: 48px; }
    .tag-page-layout { grid-template-columns: 1fr; gap: 30px; }
    .tag-page-nav { position: static; flex-direction: row; flex-wrap: wrap; gap: 6px 14px; padding: 0; border: 0; }
    .tag-page-nav strong { width: 100%; }
    .tag-topic-list h2 { font-size: 22px; }
    .topic-toc { grid-template-columns: 1fr; }
    .topic-points, .related-reading > div { grid-template-columns: 1fr; }
}