:root {
  --paper: #f8faf7;
  --paper-deep: #edf1eb;
  --ink: #243029;
  --moss: #375b45;
  --sage: #91a796;
  --sage-light: #dfe8df;
  --clay: #b86f55;
  --line: #c9d3ca;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(45, 70, 54, .1);
  --serif: "STSong", "Songti SC", "SimSun", serif;
  --sans: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); line-height: 1.75; }
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: -1; opacity: .35;
  background-image: linear-gradient(rgba(68, 93, 75, .035) 1px, transparent 1px), linear-gradient(90deg, rgba(68, 93, 75, .025) 1px, transparent 1px);
  background-size: 24px 24px;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid rgba(184, 111, 85, .45); outline-offset: 3px; }
.site-header {
  position: sticky; top: 0; z-index: 50; min-height: 72px; padding: 0 5vw; display: flex; align-items: center; justify-content: space-between;
  background: rgba(248, 250, 247, .94); border-bottom: 1px solid var(--line); backdrop-filter: blur(14px);
}
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: -.02em; }
.brand-mark {
  display: grid; place-items: center; width: 34px; height: 38px; color: var(--paper); background: var(--moss);
  border-radius: 50% 8px 50% 8px; font-family: var(--serif); font-size: 18px; transform: rotate(-7deg);
}
.primary-nav { display: flex; align-items: center; gap: clamp(18px, 2.3vw, 38px); font-size: 14px; }
.primary-nav a { position: relative; }
.primary-nav a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -9px; height: 2px; background: var(--clay); }
.primary-nav .nav-download { padding: 9px 18px; color: var(--white); background: var(--moss); border-radius: 2px 16px 2px 16px; }
.nav-toggle { display: none; border: 1px solid var(--line); background: transparent; padding: 7px 13px; color: var(--ink); }

main { overflow: hidden; }
.hero, .section, .download-hero, .help-hero { width: min(1180px, 90vw); margin: 0 auto; }
.hero { min-height: 700px; display: grid; grid-template-columns: .88fr 1.12fr; gap: 6vw; align-items: center; padding: 76px 0 96px; }
.hero-copy { position: relative; z-index: 1; }
.hero-copy::before {
  content: ""; position: absolute; width: 120px; height: 220px; left: -72px; top: 90px; opacity: .14; z-index: -1;
  border-radius: 100% 0 100% 0; background: var(--moss); transform: rotate(-18deg);
}
.kicker { margin: 0 0 15px; color: var(--clay); font-size: 13px; font-weight: 700; letter-spacing: .18em; }
h1, h2, h3, p { overflow-wrap: break-word; }
h1, h2 { font-family: var(--serif); font-weight: 600; letter-spacing: -.035em; line-height: 1.16; }
h1 { margin: 0; font-size: clamp(48px, 5.5vw, 82px); }
h2 { margin: 0; font-size: clamp(35px, 4vw, 58px); }
h3 { margin: 0; line-height: 1.35; }
.hero-intro { max-width: 540px; margin: 28px 0 30px; color: #566159; font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.button { min-width: 150px; min-height: 48px; padding: 11px 22px; display: inline-flex; align-items: center; justify-content: center; font-weight: 700; }
.button.primary { color: var(--white); background: var(--moss); border: 1px solid var(--moss); border-radius: 2px 18px 2px 18px; }
.button.text-button { border-bottom: 1px solid var(--moss); }
.button:hover, .download-button:hover { transform: translateY(-2px); }
.button, .download-button { transition: transform .2s ease, background .2s ease; }
.hero-notes { margin: 55px 0 0; display: flex; gap: 26px; }
.hero-notes div { display: flex; gap: 8px; align-items: center; }
.hero-notes dt { color: var(--clay); font-family: var(--serif); }
.hero-notes dd { margin: 0; font-size: 12px; color: #647068; white-space: nowrap; }
.hero-media { position: relative; border: 1px solid var(--line); box-shadow: var(--shadow); background: var(--white); }
.hero-media::after { content: ""; position: absolute; width: 72px; height: 30px; top: -15px; left: 48%; background: rgba(145, 167, 150, .45); transform: rotate(2deg); }
.hero-media figcaption { position: absolute; right: -18px; bottom: -44px; padding: 8px 14px; font-size: 12px; color: var(--moss); background: var(--sage-light); }
.section { padding: 108px 0; }
.section-heading { max-width: 720px; margin-bottom: 48px; }
.section-heading > p:last-child { color: #667169; max-width: 580px; }
.feature-archive { display: grid; grid-template-columns: 270px 1fr; gap: 7vw; border-top: 1px solid var(--line); }
.vertical-title { align-self: start; position: sticky; top: 120px; }
.archive-list { border-top: 1px solid var(--line); }
.archive-list article {
  min-height: 145px; display: grid; grid-template-columns: 54px 44px 150px 1fr; align-items: center; gap: 22px;
  border-bottom: 1px solid var(--line); transition: background .2s ease, padding .2s ease;
}
.archive-list article:hover { background: rgba(223, 232, 223, .35); padding: 0 16px; }
.archive-index { color: var(--clay); font-family: var(--serif); }
.archive-list h3 { font-family: var(--serif); font-size: 29px; }
.archive-list article > p:last-child { color: #667169; }
.leaf-icon { display: block; position: relative; width: 30px; height: 48px; border: 1px solid var(--moss); border-radius: 90% 0 90% 0; transform: rotate(-34deg); }
.leaf-icon::after { content: ""; position: absolute; width: 1px; height: 55px; left: 15px; top: 5px; background: var(--moss); transform: rotate(32deg); transform-origin: top; }
.leaf-b { transform: rotate(16deg) scale(.8); }
.leaf-c { border-radius: 100% 0 100% 0; transform: rotate(-55deg) scale(.9); }
.leaf-d { transform: rotate(36deg) scale(.7); background: var(--sage-light); }
.leaf-e { transform: rotate(-15deg) scale(1.05); }
.leaf-f { transform: rotate(65deg) scale(.72); background: rgba(184,111,85,.14); }
.visual-spread { display: grid; grid-template-columns: 1.2fr .8fr; gap: 7vw; align-items: center; }
.spread-image { position: relative; padding: 0 0 42px 38px; }
.spread-image::before { content: ""; position: absolute; inset: 30px 30px 0 0; z-index: -1; background: var(--sage-light); }
.spread-image img { display: block; border: 1px solid var(--line); }
.spread-copy h2 { margin-bottom: 26px; }
.spread-copy > p:not(.kicker) { color: #5d685f; }
.line-list { list-style: none; padding: 18px 0 0; margin: 0; }
.line-list li { padding: 16px 0; border-top: 1px solid var(--line); color: #667169; }
.line-list span { display: inline-block; min-width: 95px; color: var(--moss); font-weight: 700; }
.download-ledger { border-top: 1px solid var(--line); }
.download-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 34px; }
.download-item { display: grid; grid-template-columns: 54px 1fr auto; align-items: center; gap: 18px; padding: 24px 0; border-top: 1px solid var(--line); }
.download-item h3 { font-size: 19px; }
.download-item div p { margin: 4px 0 0; color: #6a746d; font-size: 13px; }
.platform-letter { width: 44px; height: 50px; margin: 0; display: grid; place-items: center; color: var(--moss); border: 1px solid var(--sage); border-radius: 50% 5px 50% 5px; font-family: var(--serif); font-size: 21px; }
.download-button {
  min-width: 132px; min-height: 42px; display: inline-flex; flex-direction: row; align-items: center; justify-content: center; padding: 8px 16px;
  color: var(--white); background: var(--moss); border-radius: 2px 13px 2px 13px; font-size: 13px; font-weight: 700;
  white-space: nowrap; word-break: keep-all; writing-mode: horizontal-tb;
}
.inline-link { display: inline-block; margin-top: 30px; color: var(--moss); font-weight: 700; border-bottom: 1px solid var(--sage); }
.offset-heading { margin-left: 23%; }
.case-tabs { display: flex; align-items: end; gap: 8px; padding-left: 7%; border-bottom: 1px solid var(--line); }
.case-tabs button { min-width: 145px; padding: 13px 18px; border: 1px solid var(--line); border-bottom: 0; color: #637067; background: var(--paper-deep); cursor: pointer; }
.case-tabs button[aria-selected="true"] { padding-top: 19px; color: var(--moss); background: var(--white); font-weight: 700; }
.case-sheet { min-height: 430px; display: grid; grid-template-columns: .8fr 1.2fr; gap: 6vw; align-items: center; padding: 54px 6%; background: var(--white); border: 1px solid var(--line); border-top: 0; }
.case-copy h3 { max-width: 470px; font-family: var(--serif); font-size: clamp(30px, 3.3vw, 48px); }
.case-label { color: var(--clay); font-weight: 700; }
.case-copy > p:not(.case-label), .case-copy li { color: #606c63; }
.case-sheet img { display: block; }
.compact-heading { max-width: none; display: flex; align-items: end; justify-content: space-between; border-bottom: 1px solid var(--line); padding-bottom: 25px; }
.quote-row { display: grid; grid-template-columns: 1fr 1.15fr 1fr; gap: 0; }
.quote-row blockquote { margin: 0; padding: 32px 34px; border-right: 1px solid var(--line); }
.quote-row blockquote:first-child { padding-left: 0; }
.quote-row blockquote:last-child { border: 0; }
.quote-row blockquote:nth-child(2) { background: var(--sage-light); }
.quote-row blockquote p { margin: 0 0 28px; font-family: var(--serif); font-size: 21px; }
.quote-row footer { color: #667169; font-size: 13px; }
.plans { background: linear-gradient(90deg, transparent 0 4%, rgba(223,232,223,.38) 4% 96%, transparent 96%); }
.plan-grid { display: grid; grid-template-columns: 1fr 1.1fr 1fr; align-items: center; gap: 0; }
.plan-grid article { min-height: 410px; padding: 44px 36px; border: 1px solid var(--line); background: var(--paper); }
.plan-grid article + article { border-left: 0; }
.plan-grid .featured-plan { min-height: 470px; padding-top: 62px; color: var(--white); background: var(--moss); border-color: var(--moss); box-shadow: var(--shadow); }
.plan-name { color: var(--clay); font-size: 13px; font-weight: 700; letter-spacing: .12em; }
.plan-grid h3 { font-family: var(--serif); font-size: 34px; }
.plan-grid ul { padding-left: 19px; margin: 30px 0; }
.plan-grid li { margin: 9px 0; }
.featured-plan .button.primary { background: var(--white); color: var(--moss); }
.featured-plan .plan-name { color: #dfb39f; }
.home-faq { display: grid; grid-template-columns: .7fr 1.3fr; gap: 8vw; }
.faq-intro { align-self: start; position: sticky; top: 120px; }
.accordion details { border-top: 1px solid var(--line); padding: 22px 0; }
.accordion details:last-child { border-bottom: 1px solid var(--line); }
.accordion summary { position: relative; padding-right: 38px; font-weight: 700; cursor: pointer; list-style: none; }
.accordion summary::after { content: "+"; position: absolute; right: 8px; color: var(--clay); font-size: 22px; }
.accordion details[open] summary::after { content: "−"; }
.accordion details p { margin: 13px 38px 0 0; color: #606b63; }
.site-footer {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 5vw; padding: 72px 5vw 28px; color: #dce4dd; background: #26382d;
}
.site-footer h2 { margin-bottom: 16px; font-family: var(--sans); font-size: 14px; color: var(--white); letter-spacing: .1em; }
.site-footer > div:not(.footer-brand) a { display: block; margin: 9px 0; color: #b8c5bb; font-size: 13px; }
.site-footer .brand-mark { color: var(--moss); background: #edf2ed; }
.footer-brand p { color: #b8c5bb; font-size: 13px; }
.copyright { grid-column: 1 / -1; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.14); color: #93a198; font-size: 12px; }

/* 下载页：设备索引册 */
.download-hero { min-height: 690px; display: grid; grid-template-columns: 1fr .55fr; grid-template-rows: auto 1fr; gap: 36px 8vw; align-items: end; padding: 80px 0 40px; }
.download-hero-title h1, .help-title h1 { font-size: clamp(50px, 7vw, 96px); }
.download-hero-note { padding-bottom: 12px; color: #5e6b62; }
.small-note { padding-left: 16px; border-left: 2px solid var(--clay); font-size: 12px; }
.download-hero-media { grid-column: 1 / -1; position: relative; height: 280px; overflow: hidden; margin: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.download-hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: center 42%; }
.system-index { display: grid; grid-template-columns: 260px 1fr; gap: 7vw; }
.system-index > aside { align-self: start; position: sticky; top: 110px; }
.system-index > aside p:last-child { color: #657168; }
.system-sheets { display: grid; grid-template-columns: 1fr 1fr; }
.system-sheets article { min-height: 390px; padding: 34px; border: 1px solid var(--line); background: var(--white); }
.system-sheets article:nth-child(even) { border-left: 0; }
.system-sheets article:nth-child(n+3) { border-top: 0; }
.sheet-top { display: flex; align-items: center; justify-content: space-between; color: #6b766e; font-size: 12px; }
.system-code { color: var(--clay); font-family: var(--serif); letter-spacing: .12em; }
.system-sheets h3 { margin-top: 35px; font-family: var(--serif); font-size: 36px; }
.system-sheets > article > p { min-height: 58px; color: #626e65; }
.system-sheets dl { margin: 26px 0; border-top: 1px solid var(--line); }
.system-sheets dl div { display: grid; grid-template-columns: 65px 1fr; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.system-sheets dd { margin: 0; color: #647068; }
.choose-guide { display: grid; grid-template-columns: 1.15fr .85fr; gap: 7vw; align-items: center; }
.guide-illustration { padding: 26px; background: var(--sage-light); border-radius: 45% 2% 45% 2%; }
.guide-illustration img { display: block; }
.guide-copy ol { list-style: none; padding: 0; margin: 30px 0 0; counter-reset: guide; }
.guide-copy li { counter-increment: guide; position: relative; padding: 18px 0 18px 55px; border-top: 1px solid var(--line); }
.guide-copy li::before { content: "0" counter(guide); position: absolute; left: 0; color: var(--clay); font-family: var(--serif); }
.guide-copy li span { font-weight: 700; }
.guide-copy li p { margin: 3px 0 0; color: #667169; }
.install-route { border-top: 1px solid var(--line); }
.route-line { display: grid; grid-template-columns: repeat(3,1fr); gap: 4vw; position: relative; }
.route-line::before { content: ""; position: absolute; left: 5%; right: 5%; top: 24px; border-top: 1px dashed var(--sage); }
.route-line article { position: relative; padding-right: 20px; background: var(--paper); }
.route-line span { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; color: var(--white); background: var(--moss); font-family: var(--serif); }
.route-line h3 { margin-top: 22px; }
.route-line p { color: #667169; }
.download-faq { display: grid; grid-template-columns: .7fr 1.3fr; gap: 8vw; background: var(--paper-deep); padding-left: 4vw; padding-right: 4vw; }

/* 帮助页：可检索的手账目录 */
.help-hero { min-height: 610px; display: grid; grid-template-columns: .82fr 1.18fr; grid-template-rows: 1fr auto; gap: 40px 7vw; align-items: center; padding: 80px 0 55px; }
.help-title p:last-child { max-width: 570px; color: #5e6961; }
.help-search { align-self: end; margin-bottom: 35px; padding: 30px; background: var(--sage-light); border-left: 3px solid var(--moss); }
.help-search label { display: block; margin-bottom: 10px; font-weight: 700; }
.help-search div { display: flex; }
.help-search input { min-width: 0; flex: 1; height: 48px; padding: 0 15px; border: 1px solid var(--sage); background: var(--white); }
.help-search button { min-width: 78px; border: 0; color: var(--white); background: var(--moss); cursor: pointer; }
.help-search > p { margin: 10px 0 0; color: #667169; font-size: 12px; }
.help-hero-media { grid-column: 1 / -1; margin: 0; max-height: 260px; overflow: hidden; border: 1px solid var(--line); }
.help-hero-media img { width: 100%; height: 100%; object-fit: cover; }
.help-catalog { display: grid; grid-template-columns: 270px 1fr; gap: 8vw; }
.catalog-tabs { align-self: start; position: sticky; top: 108px; }
.catalog-tabs h2 { margin-bottom: 28px; }
.catalog-tabs a { display: block; padding: 11px 0; border-bottom: 1px solid var(--line); color: #5e6a62; }
.catalog-tabs a:hover { padding-left: 8px; color: var(--moss); }
.help-group { margin-bottom: 76px; scroll-margin-top: 100px; }
.help-group > header { display: flex; gap: 22px; align-items: center; padding-bottom: 22px; border-bottom: 2px solid var(--moss); }
.help-group > header > span { color: var(--clay); font-family: var(--serif); font-size: 34px; }
.help-group h3 { font-family: var(--serif); font-size: 31px; }
.help-group header p { margin: 2px 0 0; color: #69746c; font-size: 13px; }
.help-group details { padding: 22px 10px; border-bottom: 1px solid var(--line); }
.help-group summary { position: relative; list-style: none; padding-right: 35px; cursor: pointer; font-weight: 700; }
.help-group summary::after { content: "↘"; position: absolute; right: 4px; color: var(--clay); }
.help-group details[open] summary::after { content: "↖"; }
.help-group details p { max-width: 720px; margin: 14px 0 0; color: #5f6b62; }
.help-group details.search-hidden { display: none; }
.support-note { display: grid; grid-template-columns: 1.2fr .8fr auto; gap: 5vw; align-items: center; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.support-note > div p:last-child { color: #626e65; }
.support-note ol { padding-left: 22px; color: #59665d; }

@media (max-width: 900px) {
  .site-header { min-height: 64px; }
  .nav-toggle { display: block; }
  .primary-nav { display: none; position: absolute; left: 0; right: 0; top: 64px; padding: 18px 5vw 24px; flex-direction: column; align-items: stretch; background: var(--paper); border-bottom: 1px solid var(--line); }
  .primary-nav.open { display: flex; }
  .primary-nav a.active::after { display: none; }
  .primary-nav .nav-download { text-align: center; }
  .hero { min-height: auto; grid-template-columns: 1fr; padding-top: 58px; }
  .hero-media figcaption { right: 0; }
  .feature-archive, .system-index, .help-catalog { grid-template-columns: 1fr; }
  .vertical-title, .system-index > aside, .catalog-tabs, .faq-intro { position: static; }
  .visual-spread, .choose-guide { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .offset-heading { margin-left: 0; }
  .case-sheet { grid-template-columns: 1fr; }
  .quote-row { grid-template-columns: 1fr; }
  .quote-row blockquote, .quote-row blockquote:first-child { padding: 28px; border-right: 0; border-bottom: 1px solid var(--line); }
  .plan-grid { grid-template-columns: 1fr; gap: 16px; }
  .plan-grid article + article { border-left: 1px solid var(--line); }
  .plan-grid .featured-plan { order: -1; min-height: 420px; }
  .home-faq, .download-faq { grid-template-columns: 1fr; }
  .download-hero, .help-hero { grid-template-columns: 1fr; grid-template-rows: auto; }
  .download-hero-media, .help-hero-media { grid-column: auto; }
  .route-line { grid-template-columns: 1fr; }
  .route-line::before { display: none; }
  .support-note { grid-template-columns: 1fr; }
  .site-footer { grid-template-columns: 1fr 1fr; }
  .footer-brand, .copyright { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  h1 { font-size: 44px; }
  h2 { font-size: 34px; }
  .section { padding: 76px 0; }
  .hero-notes { flex-direction: column; gap: 8px; }
  .hero-media figcaption { position: static; }
  .archive-list article { min-height: 170px; grid-template-columns: 42px 32px 1fr; gap: 12px; padding: 18px 0; }
  .archive-list article > p:last-child { grid-column: 3; margin: 0; }
  .download-grid { grid-template-columns: 1fr; }
  .download-item { grid-template-columns: 48px 1fr; }
  .download-item .download-button { grid-column: 1 / -1; width: 100%; }
  .case-tabs { padding-left: 0; overflow-x: auto; }
  .case-tabs button { min-width: 118px; }
  .case-sheet { padding: 36px 22px; }
  .compact-heading { display: block; }
  .system-sheets { grid-template-columns: 1fr; }
  .system-sheets article:nth-child(even) { border-left: 1px solid var(--line); }
  .system-sheets article:nth-child(n+2) { border-top: 0; }
  .download-hero-media { height: auto; }
  .help-search { padding: 22px; }
  .site-footer { grid-template-columns: 1fr; }
  .site-footer > * { grid-column: 1; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

/* Hero 图片强制最终覆盖：保持自然比例，不裁切、不旋转 */
.hero.specimen-page { align-items: center !important; }
.hero.specimen-page .hero-media { align-self: center !important; height: auto !important; min-height: 0 !important; max-height: none !important; margin: 0 !important; padding: 0 !important; overflow: visible !important; clip-path: none !important; transform: none !important; }
.hero.specimen-page .hero-media > img { display: block !important; width: 100% !important; height: auto !important; min-height: 0 !important; max-height: none !important; margin: 0 !important; padding: 0 !important; object-fit: contain !important; object-position: center !important; clip-path: none !important; transform: none !important; }