:root {
    --primary: #6F5AE8;
    --primary-soft: #9A8CF2;
    --deep: #242433;
    --bg: #F8F8FC;
    --bg-soft: #F0EEFA;
    --text: #30303A;
    --muted: #70707D;
    --accent: #F29A4A;
    --white: #FFFFFF;
    --border: rgba(36, 36, 51, .11);
    --shadow: 0 20px 60px rgba(36, 36, 51, .08);
    --radius: 24px;
    --radius-sm: 15px;
    --container: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--text); background: var(--bg); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; line-height: 1.72; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 4px; }
button, input { font: inherit; }
button { cursor: pointer; }
code { background: var(--bg-soft); border-radius: 6px; padding: .12em .38em; }
.container { width: min(calc(100% - 40px), var(--container)); margin: 0 auto; }
.narrow { width: min(calc(100% - 40px), 860px); margin: 0 auto; }
.narrow-wide { width: min(calc(100% - 40px), 980px); margin: 0 auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 1000; background: var(--deep); color: var(--white); padding: 10px 16px; border-radius: 8px; }
.skip-link:focus { top: 16px; }
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(248,248,252,.94); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
.header-inner { min-height: 76px; display: flex; align-items: center; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 10px; margin-right: auto; text-decoration: none; }
.brand img { width: 46px; height: 46px; object-fit: contain; }
.brand-text { display: grid; line-height: 1.2; }
.brand-text strong { font-size: 17px; }
.brand-text small { color: var(--muted); font-size: 12px; margin-top: 4px; }
.site-nav { display: flex; align-items: center; gap: 5px; }
.site-nav a { text-decoration: none; padding: 9px 11px; border-radius: 10px; color: #4b4b59; font-size: 14px; }
.site-nav a:hover, .site-nav a.is-active { color: var(--primary); background: var(--bg-soft); }
.search-open, .menu-toggle { border: 1px solid var(--border); background: var(--white); border-radius: 11px; padding: 9px 13px; color: var(--text); }
.menu-toggle { display: none; }
.search-modal[hidden] { display: none !important; }
.search-modal { position: fixed; inset: 0; z-index: 200; display: grid; place-items: start center; padding: 12vh 20px 20px; }
.search-backdrop { position: absolute; inset: 0; background: rgba(20, 20, 29, .58); }
.search-dialog { position: relative; z-index: 1; width: min(720px, 100%); background: var(--white); border-radius: 24px; padding: 34px; box-shadow: 0 30px 100px rgba(0,0,0,.2); }
.search-close { position: absolute; right: 20px; top: 16px; border: 0; background: transparent; font-size: 30px; color: var(--muted); }
.search-form label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.search-row, .inline-search { display: flex; gap: 10px; }
.search-row input, .inline-search input { min-width: 0; flex: 1; border: 1px solid var(--border); border-radius: 12px; padding: 13px 14px; background: var(--bg); color: var(--text); }
body.modal-open { overflow: hidden; }
.hero { padding: 68px 0 54px; background: radial-gradient(circle at 85% 10%, rgba(154,140,242,.18), transparent 32%), var(--bg); }
.hero-grid, .page-hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 64px; }
.hero-copy h1, .page-hero h1 { font-size: clamp(38px, 5vw, 68px); line-height: 1.08; letter-spacing: -.04em; margin: 14px 0 22px; color: var(--deep); }
.hero-lead, .page-hero p { font-size: 18px; color: #555565; max-width: 720px; }
.eyebrow { color: var(--primary); text-transform: none; letter-spacing: .08em; font-size: 13px; font-weight: 800; margin: 0 0 8px; }
.hero-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 46px; padding: 10px 18px; border-radius: 12px; border: 1px solid transparent; text-decoration: none; font-weight: 700; }
.button-primary { background: var(--primary); color: var(--white); }
.button-primary:hover { background: #5d49da; }
.button-accent { background: var(--accent); color: #2e2116; }
.button-secondary { background: var(--white); border-color: var(--border); color: var(--deep); }
.button-light { background: var(--white); color: var(--deep); }
.text-link { color: var(--primary); font-weight: 700; }
.hero-note { margin-top: 26px; padding: 14px 16px; border-left: 3px solid var(--primary-soft); background: rgba(240,238,250,.75); border-radius: 0 12px 12px 0; color: #555565; font-size: 14px; }
.hero-media img, .page-hero img { width: 100%; border-radius: 32px; box-shadow: var(--shadow); object-fit: cover; aspect-ratio: 4 / 3; }
.section { padding: 84px 0; }
.section-soft { background: var(--bg-soft); }
.section-deep { background: var(--deep); color: var(--white); }
.section-heading { max-width: 780px; margin: 0 auto 36px; text-align: center; }
.section-heading.align-left { margin-left: 0; text-align: left; }
.section-heading h2, .feature-copy h2, .editorial-aside h2, .guide-band h2, .about-band h2, .next-path h2 { margin: 8px 0 14px; color: var(--deep); font-size: clamp(28px, 3vw, 42px); line-height: 1.16; letter-spacing: -.025em; }
.section-heading p, .feature-copy p, .editorial-aside p, .guide-band p, .about-band p, .next-path p { color: var(--muted); }
.section-heading-light h2, .section-heading-light p { color: var(--white); }
.intent-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 18px; }
.intent-card { position: relative; background: rgba(255,255,255,.72); border: 1px solid rgba(111,90,232,.12); border-radius: var(--radius); padding: 30px; min-height: 290px; display: flex; flex-direction: column; }
.intent-card.intent-main { background: var(--white); box-shadow: var(--shadow); }
.intent-card .number { color: var(--primary-soft); font-weight: 800; font-size: 13px; }
.intent-card h3 { font-size: 24px; margin: 40px 0 10px; color: var(--deep); }
.intent-card p { color: var(--muted); }
.intent-card a { margin-top: auto; color: var(--primary); font-weight: 700; }
.split-feature { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.split-feature.reverse .feature-media { order: 2; }
.feature-media img { width: 100%; border-radius: 26px; box-shadow: var(--shadow); }
.definition-list { margin: 28px 0 0; display: grid; gap: 2px; }
.definition-list div { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.definition-list dt { font-weight: 800; color: var(--deep); }
.definition-list dd { margin: 0; color: var(--muted); }
.core-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.core-grid article { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.13); border-radius: 20px; padding: 28px; }
.core-grid h3 { font-size: 20px; margin-top: 0; }
.core-grid p { color: #c9c9d3; }
.core-grid a { color: #fff; font-weight: 700; }
.editorial-grid { display: grid; grid-template-columns: 1.35fr .65fr; gap: 48px; align-items: start; }
.article-list { border-top: 1px solid var(--border); }
.article-row { display: grid; grid-template-columns: 1fr auto; gap: 20px; padding: 23px 0; border-bottom: 1px solid var(--border); }
.article-row h3 { margin: 6px 0 5px; font-size: 21px; line-height: 1.3; }
.article-row h3 a { text-decoration: none; }
.article-row p { margin: 0; color: var(--muted); }
.meta-label { display: inline-flex; width: fit-content; font-size: 12px; font-weight: 800; color: var(--primary); background: rgba(111,90,232,.09); border-radius: 999px; padding: 4px 9px; }
.row-link { align-self: center; color: var(--primary); font-size: 24px; text-decoration: none; }
.editorial-aside { position: sticky; top: 104px; background: var(--bg-soft); border-radius: var(--radius); padding: 24px; }
.editorial-aside img { border-radius: 18px; margin-bottom: 22px; }
.stack-links { display: grid; gap: 10px; margin-top: 22px; }
.stack-links a, .side-card > a { display: block; padding: 12px 0; border-bottom: 1px solid var(--border); color: var(--primary); font-weight: 700; }
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.topic-card { background: var(--white); border-radius: 22px; overflow: hidden; box-shadow: 0 10px 30px rgba(36,36,51,.05); }
.topic-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.topic-card div { padding: 24px; }
.topic-card h3 { font-size: 21px; margin: 0 0 8px; }
.topic-card p { color: var(--muted); }
.topic-card a { color: var(--primary); font-weight: 700; }
.guide-band, .about-band { display: grid; grid-template-columns: .75fr 1.25fr; gap: 54px; align-items: center; }
.guide-band > img, .about-band > img { border-radius: 24px; box-shadow: var(--shadow); }
.about-band { grid-template-columns: 1.2fr .8fr; }
.mini-steps { list-style: none; padding: 0; margin: 24px 0; display: grid; gap: 14px; }
.mini-steps li { display: grid; grid-template-columns: 36px 1fr; gap: 14px; align-items: start; }
.mini-steps li > span { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--bg-soft); color: var(--primary); font-weight: 800; }
.mini-steps p { margin: 2px 0 0; font-size: 14px; }
.faq-list { display: grid; gap: 12px; }
.faq-list details { background: var(--white); border: 1px solid var(--border); border-radius: 16px; padding: 0 20px; }
.faq-list summary { cursor: pointer; font-weight: 800; padding: 18px 36px 18px 0; list-style: none; position: relative; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: '+'; position: absolute; right: 0; top: 15px; font-size: 24px; color: var(--primary); }
.faq-list details[open] summary::after { content: '−'; }
.faq-list details p { margin: 0; padding: 0 0 20px; color: var(--muted); }
.center-action { text-align: center; margin-top: 26px; }
.page-hero { padding: 58px 0 66px; background: linear-gradient(180deg, var(--bg-soft), var(--bg)); }
.page-hero-web { background: radial-gradient(circle at 82% 20%, rgba(111,90,232,.16), transparent 28%), var(--bg-soft); }
.page-hero-download { background: radial-gradient(circle at 78% 18%, rgba(242,154,74,.15), transparent 30%), var(--bg-soft); }
.compact-hero h1 { font-size: clamp(34px, 4.2vw, 56px); }
.breadcrumbs { margin-bottom: 22px; }
.breadcrumbs ol { list-style: none; margin: 0; padding: 0; display: flex; gap: 8px; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.breadcrumbs li:not(:last-child)::after { content: '›'; margin-left: 8px; }
.breadcrumbs a { color: var(--primary); }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 60px; align-items: start; }
.prose { font-size: 17px; }
.prose h2 { margin: 44px 0 14px; font-size: 29px; line-height: 1.24; color: var(--deep); }
.prose h2:first-child { margin-top: 0; }
.prose p { color: #4e4e59; }
.prose ul { padding-left: 20px; }
.check-list { list-style: none; padding: 0 !important; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; }
.check-list li::before { content: '✓'; position: absolute; left: 0; color: var(--primary); font-weight: 900; }
.callout { margin: 26px 0; padding: 20px 22px; background: var(--bg-soft); border-left: 4px solid var(--primary); border-radius: 0 14px 14px 0; }
.side-card { position: sticky; top: 104px; background: var(--white); border: 1px solid var(--border); border-radius: 22px; padding: 24px; box-shadow: 0 14px 40px rgba(36,36,51,.05); }
.side-card img { border-radius: 16px; margin-bottom: 20px; }
.side-card h2 { font-size: 21px; margin-top: 0; }
.side-card ol { padding-left: 22px; color: var(--muted); }
.compare-table { margin: 28px 0; border: 1px solid var(--border); border-radius: 16px; overflow: hidden; font-size: 15px; }
.compare-row { display: grid; grid-template-columns: 1fr 1fr 1fr; }
.compare-row span { padding: 13px 14px; border-right: 1px solid var(--border); border-top: 1px solid var(--border); }
.compare-row span:last-child { border-right: 0; }
.compare-head { background: var(--bg-soft); font-weight: 800; }
.compare-head span { border-top: 0; }
.card-grid { display: grid; gap: 20px; }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
.content-card { background: var(--white); border: 1px solid var(--border); border-radius: 20px; padding: 24px; }
.content-card img { width: calc(100% + 48px); max-width: none; margin: -24px -24px 20px; border-radius: 20px 20px 0 0; aspect-ratio: 16 / 10; object-fit: cover; }
.content-card h3 { font-size: 20px; line-height: 1.35; }
.content-card h3 a { text-decoration: none; }
.content-card p { color: var(--muted); }
.content-card > a:last-child { color: var(--primary); font-weight: 700; }
.next-path { display: flex; justify-content: space-between; gap: 40px; align-items: center; }
.next-path > div { max-width: 720px; }
.dark-path h2, .dark-path p { color: var(--white); }
.timeline { display: grid; gap: 0; max-width: 960px; margin: 0 auto; }
.timeline article { display: grid; grid-template-columns: 84px 1fr; gap: 24px; padding: 30px 0; border-bottom: 1px solid var(--border); }
.timeline article > span { display: grid; place-items: center; width: 56px; height: 56px; border-radius: 50%; background: var(--bg-soft); color: var(--primary); font-weight: 900; }
.timeline h3 { margin: 0 0 8px; font-size: 23px; }
.timeline p { margin: 0; color: var(--muted); }
.guide-steps-large { display: grid; gap: 0; max-width: 980px; }
.guide-steps-large article { display: grid; grid-template-columns: 100px 1fr; gap: 30px; padding: 36px 0; border-bottom: 1px solid var(--border); }
.guide-step-no { font-size: 42px; color: var(--primary-soft); font-weight: 900; line-height: 1; }
.guide-steps-large h2 { margin: 0 0 8px; font-size: 28px; }
.guide-steps-large p { color: var(--muted); }
.guide-steps-large a { color: var(--primary); font-weight: 700; }
.article-index { display: grid; border-top: 1px solid var(--border); }
.index-row { position: relative; display: grid; grid-template-columns: 120px 1.1fr 1.5fr 30px; gap: 18px; align-items: center; padding: 20px 0; border-bottom: 1px solid var(--border); text-decoration: none; }
.index-row strong { color: var(--deep); }
.index-row p { margin: 0; color: var(--muted); font-size: 14px; }
.index-arrow { color: var(--primary); font-size: 22px; }
.topic-list-large { display: grid; gap: 36px; }
.topic-list-large article { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: center; background: var(--white); border: 1px solid var(--border); border-radius: 24px; padding: 24px; }
.topic-list-large img { border-radius: 18px; }
.article-hero { padding: 52px 0 26px; }
.article-hero h1 { max-width: 880px; margin: 14px 0; font-size: clamp(36px, 4.4vw, 58px); line-height: 1.1; letter-spacing: -.035em; color: var(--deep); }
.article-deck { max-width: 800px; color: var(--muted); font-size: 18px; }
.article-hero img { margin-top: 32px; width: 100%; max-height: 560px; object-fit: cover; border-radius: 24px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 760px) 280px; gap: 60px; align-items: start; padding-top: 34px; padding-bottom: 90px; }
.article-sidebar { position: sticky; top: 104px; border-left: 1px solid var(--border); padding-left: 24px; }
.article-sidebar h2 { font-size: 18px; }
.article-sidebar a { display: block; color: var(--primary); padding: 9px 0; }
.article-end-note { margin-top: 42px; padding: 20px; border: 1px solid var(--border); border-radius: 16px; background: var(--bg-soft); }
.faq-list-large details { padding-left: 24px; padding-right: 24px; }
.faq-list-large summary { font-size: 18px; }
.search-page-head { padding: 58px 0 20px; }
.search-page-head h1 { font-size: clamp(34px, 4vw, 52px); margin: 10px 0 24px; color: var(--deep); }
.result-summary { margin-bottom: 20px; color: var(--muted); }
.empty-state { text-align: center; background: var(--white); border: 1px solid var(--border); border-radius: 22px; padding: 54px 26px; }
.empty-state h2 { margin-top: 0; }
.empty-state p { color: var(--muted); }
.not-found { padding: 100px 0; text-align: center; }
.error-code { margin: 0; color: var(--primary-soft); font-weight: 900; font-size: 84px; line-height: 1; }
.not-found h1 { font-size: clamp(32px, 4vw, 50px); color: var(--deep); line-height: 1.15; }
.not-found p { color: var(--muted); }
.center-actions { justify-content: center; }
.quick-links { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; margin-top: 30px; }
.quick-links a { color: var(--primary); font-weight: 700; }
.site-footer { background: #1d1d29; color: #d6d6df; padding: 58px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 60px; }
.footer-title { color: var(--white); font-size: 18px; margin-top: 0; }
.footer-grid p { color: #b3b3c0; max-width: 520px; }
.footer-grid a { display: block; color: #d6d6df; padding: 5px 0; }
.footer-bottom { margin-top: 42px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.1); display: flex; justify-content: space-between; gap: 20px; font-size: 13px; color: #9e9eab; }
.back-top { position: fixed; right: 20px; bottom: 20px; z-index: 90; width: 44px; height: 44px; border: 0; border-radius: 50%; background: var(--primary); color: var(--white); box-shadow: 0 10px 30px rgba(111,90,232,.25); opacity: 0; pointer-events: none; transform: translateY(8px); transition: .2s ease; }
.back-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }
@media (max-width: 1100px) {
    .site-nav { position: absolute; left: 20px; right: 20px; top: 70px; display: none; background: var(--white); border: 1px solid var(--border); box-shadow: var(--shadow); border-radius: 16px; padding: 10px; }
    .site-nav.is-open { display: grid; }
    .menu-toggle { display: inline-flex; order: 2; }
    .search-open { order: 3; }
    .hero-grid, .page-hero-grid { gap: 36px; }
    .core-grid { grid-template-columns: repeat(2, 1fr); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 280px; gap: 36px; }
}
@media (max-width: 900px) {
    .hero-grid, .page-hero-grid, .split-feature, .editorial-grid, .guide-band, .about-band, .content-layout, .article-layout, .topic-list-large article { grid-template-columns: 1fr; }
    .hero-media { order: -1; }
    .page-hero-grid img { max-height: 480px; }
    .intent-grid, .topic-grid, .card-grid.three { grid-template-columns: 1fr 1fr; }
    .intent-grid .intent-main { grid-column: 1 / -1; }
    .editorial-aside, .side-card, .article-sidebar { position: static; }
    .article-sidebar { border-left: 0; border-top: 1px solid var(--border); padding-left: 0; padding-top: 20px; }
    .split-feature.reverse .feature-media { order: 0; }
    .index-row { grid-template-columns: 100px 1fr 30px; }
    .index-row p { grid-column: 2 / 3; }
}
@media (max-width: 680px) {
    .container, .narrow, .narrow-wide { width: min(calc(100% - 28px), var(--container)); }
    .header-inner { min-height: 68px; gap: 8px; }
    .brand img { width: 40px; height: 40px; }
    .brand-text small { display: none; }
    .search-open { font-size: 0; width: 42px; height: 42px; padding: 0; }
    .search-open::after { content: '⌕'; font-size: 24px; }
    .hero { padding-top: 36px; }
    .hero-copy h1, .page-hero h1 { font-size: 38px; }
    .section { padding: 62px 0; }
    .intent-grid, .topic-grid, .card-grid.three, .core-grid { grid-template-columns: 1fr; }
    .intent-grid .intent-main { grid-column: auto; }
    .definition-list div { grid-template-columns: 1fr; gap: 4px; }
    .next-path { align-items: flex-start; flex-direction: column; }
    .timeline article, .guide-steps-large article { grid-template-columns: 60px 1fr; gap: 16px; }
    .guide-step-no { font-size: 30px; }
    .compare-table { overflow-x: auto; }
    .compare-row { min-width: 620px; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .footer-bottom { flex-direction: column; }
    .search-row, .inline-search { flex-direction: column; }
    .index-row { grid-template-columns: 1fr 26px; gap: 8px; }
    .index-row .meta-label { grid-column: 1 / 2; }
    .index-row strong, .index-row p { grid-column: 1 / 2; }
    .index-arrow { grid-column: 2; grid-row: 1 / 4; align-self: center; }
    .article-hero { padding-top: 34px; }
    .article-hero h1 { font-size: 36px; }
}
@media (max-width: 420px) {
    .brand-text strong { font-size: 15px; }
    .menu-toggle { padding: 8px 10px; }
    .hero-copy h1, .page-hero h1, .article-hero h1 { font-size: 32px; }
    .hero-actions { align-items: stretch; flex-direction: column; }
    .hero-actions .button { width: 100%; }
    .intent-card { min-height: 0; }
    .intent-card h3 { margin-top: 26px; }
    .timeline article, .guide-steps-large article { grid-template-columns: 1fr; }
}