:root {
  --ink: #17202a;
  --muted: #5f6973;
  --paper: #f7f9f8;
  --white: #ffffff;
  --line: #ccd5d2;
  --teal: #087f73;
  --teal-dark: #065e56;
  --raspberry: #e83e67;
  --yellow: #f5c542;
  --shadow: 0 18px 44px rgba(23, 32, 42, .13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  line-height: 1.7;
  letter-spacing: 0;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button, input { font: inherit; letter-spacing: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 72px;
  background: rgba(247, 249, 248, .96);
  border-bottom: 1px solid var(--line);
}
.header-inner, .hero-inner, .section-inner, .footer-inner {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 800; }
.brand img { width: 44px; height: 44px; border: 1px solid var(--ink); border-radius: 6px; }
.site-nav { display: flex; align-items: center; gap: 30px; font-size: 14px; font-weight: 700; }
.site-nav > a:not(.button) { position: relative; padding: 22px 0; }
.site-nav > a:not(.button)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 15px; height: 3px; background: var(--raspberry); transition: right .2s ease; }
.site-nav > a:hover::after, .site-nav > a.is-current::after { right: 0; }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 11px; border: 1px solid var(--ink); background: var(--white); cursor: pointer; }
.menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--ink); transition: transform .2s, opacity .2s; }

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 11px 24px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  background: var(--raspberry);
  color: var(--white);
  font-weight: 800;
  box-shadow: 5px 5px 0 var(--ink);
  transition: transform .18s, box-shadow .18s;
}
.button:hover { transform: translate(2px, 2px); box-shadow: 3px 3px 0 var(--ink); }
.button-small { min-height: 40px; padding: 7px 18px; box-shadow: 3px 3px 0 var(--ink); }
.button-light { background: var(--yellow); color: var(--ink); border-color: var(--white); box-shadow: 5px 5px 0 var(--white); }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--teal-dark); font-weight: 800; border-bottom: 2px solid currentColor; }

.hero { overflow: hidden; background: var(--white); border-bottom: 1px solid var(--line); }
.hero-inner { display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(420px, .96fr); gap: 64px; align-items: center; padding-block: 34px 42px; }
.hero-copy { max-width: 630px; }
.eyebrow { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.eyebrow span { padding: 4px 9px; border: 1px solid var(--ink); background: var(--yellow); color: var(--ink); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.eyebrow span:nth-child(2) { background: var(--white); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 16px; font-size: 54px; line-height: 1.13; letter-spacing: 0; }
.grouped-title span { display: block; }
.hero-copy > p { max-width: 590px; margin-bottom: 22px; color: #46505a; font-size: 17px; line-height: 1.78; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; }
.hero-facts { display: grid; grid-template-columns: repeat(3, 1fr); margin: 26px 0 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.hero-facts div { padding: 10px 12px; border-right: 1px solid var(--line); }
.hero-facts div:first-child { padding-left: 0; }
.hero-facts div:last-child { border-right: 0; }
.hero-facts dt { color: var(--teal); font-size: 12px; font-weight: 900; }
.hero-facts dd { margin: 1px 0 0; font-size: 13px; font-weight: 700; }
.hero-media { position: relative; min-height: 452px; display: flex; align-items: center; justify-content: center; border-left: 1px solid var(--line); }
.phone-frame { margin: 0; padding: 8px; border: 2px solid var(--ink); border-radius: 8px; background: var(--ink); box-shadow: var(--shadow); }
.phone-frame img { border-radius: 3px; }
.hero-phone { width: 205px; z-index: 2; }
.hero-phone img { width: 100%; max-width: 400px; }
.control-tabs { position: absolute; left: 8px; top: 78px; z-index: 3; display: grid; gap: 8px; }
.control-tabs span { min-width: 116px; padding: 8px 14px; border: 2px solid var(--ink); background: var(--white); font-size: 13px; font-weight: 800; box-shadow: 4px 4px 0 var(--teal); }
.control-tabs span:nth-child(2) { margin-left: 24px; background: var(--yellow); box-shadow-color: var(--raspberry); }
.control-tabs span:nth-child(3) { margin-left: 48px; }
.media-label { position: absolute; right: 0; bottom: 34px; display: flex; align-items: center; gap: 10px; padding: 8px 12px; border: 2px solid var(--ink); background: var(--raspberry); color: var(--white); }
.media-label b { font-size: 28px; line-height: 1; }
.media-label span { font-size: 9px; line-height: 1.2; font-weight: 900; }

.section-inner { padding-block: 78px; }
.section-band { background: #edf2f0; border-block: 1px solid var(--line); }
.section-heading { margin-bottom: 32px; }
.section-heading h2 { margin-bottom: 0; font-size: 34px; line-height: 1.2; }
.split-heading { display: flex; align-items: end; justify-content: space-between; gap: 32px; }
.section-note { max-width: 590px; color: var(--muted); font-size: 15px; }
.step-rail { display: grid; grid-template-columns: repeat(4, 1fr); padding: 0; margin: 0; list-style: none; border: 1px solid var(--ink); background: var(--white); }
.step-rail li { position: relative; min-height: 190px; padding: 24px 22px; border-right: 1px solid var(--ink); }
.step-rail li:last-child { border-right: 0; }
.step-rail li > span { display: inline-block; margin-bottom: 30px; color: var(--raspberry); font-size: 13px; font-weight: 900; }
.step-rail h3 { margin-bottom: 7px; font-size: 18px; }
.step-rail p { margin-bottom: 0; color: var(--muted); font-size: 14px; }

.feature-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 14px; }
.feature { min-height: 245px; padding: 26px; border: 1px solid var(--ink); background: var(--white); }
.feature-wide { grid-row: span 2; min-height: 504px; background: var(--teal); color: var(--white); }
.feature-accent { grid-column: span 2; background: var(--yellow); }
.feature-index { display: inline-grid; place-items: center; width: 34px; height: 34px; margin-bottom: 52px; border: 1px solid currentColor; font-size: 13px; font-weight: 900; }
.feature h3 { margin-bottom: 10px; font-size: 24px; }
.feature p { margin-bottom: 0; color: var(--muted); }
.feature-wide p { color: #e4f4f1; font-size: 17px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 44px; }
.tag-row span { padding: 7px 10px; border: 1px solid var(--white); font-size: 13px; }

.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; align-items: start; }
.screen-card { margin: 0; padding: 12px; border: 1px solid var(--ink); background: var(--white); box-shadow: 8px 8px 0 var(--teal); }
.screen-card-shift { margin-top: 48px; box-shadow-color: var(--raspberry); }
.screen-card-tall { box-shadow-color: var(--yellow); }
.screen-meta { display: flex; justify-content: space-between; padding: 3px 2px 10px; font-size: 13px; }
.screen-card img { width: 100%; max-width: 400px; aspect-ratio: 400 / 889; object-fit: contain; background: #e6eae8; }
.screen-card figcaption { padding: 14px 4px 3px; color: var(--muted); font-size: 14px; }

.link-panels { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.link-panel { position: relative; min-height: 250px; padding: 34px; border: 1px solid var(--ink); background: var(--yellow); }
.link-panel-dark { background: var(--ink); color: var(--white); }
.panel-kicker { display: block; margin-bottom: 40px; font-size: 11px; font-weight: 900; }
.link-panel h3 { max-width: 420px; margin-bottom: 9px; font-size: 26px; }
.link-panel p { max-width: 470px; margin-bottom: 0; color: inherit; opacity: .8; }
.panel-arrow { position: absolute; right: 28px; top: 28px; font-size: 34px; font-weight: 700; }
.narrow { width: min(850px, calc(100% - 48px)); }
.mini-faq { border-top: 1px solid var(--ink); }
.mini-faq details { border-bottom: 1px solid var(--ink); }
.mini-faq summary { padding: 20px 4px; cursor: pointer; font-weight: 800; }
.mini-faq p { padding: 0 4px 20px; margin-bottom: 0; color: var(--muted); }
.centered-link { margin-top: 28px; }

.final-action { background: var(--teal); color: var(--white); }
.final-action-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; padding-block: 48px; }
.final-action h2 { max-width: 700px; margin-bottom: 0; font-size: 30px; }
.final-action .panel-kicker { margin-bottom: 8px; }

.site-footer { border-top: 1px solid var(--line); background: var(--white); }
.footer-inner { padding-block: 36px; text-align: center; }
.footer-brand { display: inline-flex; align-items: center; gap: 9px; margin-bottom: 18px; font-size: 18px; }
.footer-brand img { border-radius: 4px; }
.footer-inner nav { display: flex; justify-content: center; flex-wrap: wrap; gap: 24px; margin-bottom: 20px; font-size: 14px; font-weight: 700; }
.disclaimer { max-width: 820px; margin: 0 auto 8px; color: var(--muted); font-size: 13px; text-align: center; }
.copyright { margin-bottom: 0; color: #7d858c; font-size: 12px; text-align: center; }

.page-hero { background: var(--white); border-bottom: 1px solid var(--line); }
.page-hero-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr); gap: 72px; align-items: center; padding-block: 62px; }
.page-hero h1 { max-width: 760px; font-size: 48px; }
.page-hero p { max-width: 720px; color: var(--muted); font-size: 17px; }
.route-card { border: 1px solid var(--ink); background: var(--yellow); box-shadow: 9px 9px 0 var(--teal); }
.route-label { display: block; padding: 10px 16px; border-bottom: 1px solid var(--ink); font-size: 11px; font-weight: 900; }
.route-card ol { padding: 0; margin: 0; list-style: none; }
.route-card li { display: flex; gap: 16px; padding: 14px 16px; border-bottom: 1px solid var(--ink); font-weight: 700; }
.route-card li:last-child { border-bottom: 0; }
.route-card b { color: var(--raspberry); }

.guide-content, .faq-content { background: var(--paper); }
.article-layout { display: grid; grid-template-columns: 220px minmax(0, 760px); justify-content: space-between; gap: 70px; }
.article-nav { position: sticky; top: 96px; align-self: start; display: grid; border: 1px solid var(--ink); background: var(--white); }
.article-nav span { padding: 12px 15px; background: var(--ink); color: var(--white); font-size: 12px; font-weight: 900; }
.article-nav a { padding: 11px 15px; border-bottom: 1px solid var(--line); font-size: 14px; }
.article-nav a:last-child { border-bottom: 0; }
.article-nav a:hover { background: var(--yellow); }
.article-body > section { position: relative; padding: 0 0 58px 64px; border-left: 1px solid var(--ink); }
.article-body > section:last-child { padding-bottom: 0; }
.article-index { position: absolute; left: -20px; top: 0; display: grid; place-items: center; width: 40px; height: 40px; border: 1px solid var(--ink); background: var(--raspberry); color: var(--white); font-size: 12px; font-weight: 900; }
.article-body h2 { margin-bottom: 18px; font-size: 30px; line-height: 1.25; }
.article-body p { color: #404b54; }
.article-body a { color: var(--teal-dark); font-weight: 800; border-bottom: 1px solid currentColor; }
.check-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 22px; border: 1px solid var(--ink); background: var(--white); }
.check-grid div { padding: 16px; border-right: 1px solid var(--ink); }
.check-grid div:last-child { border-right: 0; }
.check-grid b, .check-grid span { display: block; }
.check-grid span { margin-top: 5px; color: var(--muted); font-size: 12px; }
.notice { margin-top: 22px; padding: 18px 20px; border: 1px solid var(--ink); border-left: 8px solid var(--yellow); background: var(--white); }
.notice p { margin: 4px 0 0; }
.article-figure { display: grid; grid-template-columns: 210px 1fr; gap: 22px; align-items: center; margin: 24px 0 0; padding: 14px; border: 1px solid var(--ink); background: var(--white); }
.article-figure img { width: 210px; max-width: 400px; max-height: 460px; object-fit: contain; background: #e9eeec; }
.article-figure figcaption { color: var(--muted); font-size: 14px; }

.faq-hero .page-hero-grid { grid-template-columns: minmax(0, 1fr) 380px; }
.faq-filter-box { padding: 24px; border: 1px solid var(--ink); background: #edf2f0; box-shadow: 9px 9px 0 var(--raspberry); }
.faq-filter-box label { display: block; margin-bottom: 9px; font-weight: 900; }
.search-wrap { position: relative; }
.search-wrap input { width: 100%; height: 50px; padding: 10px 44px 10px 12px; border: 1px solid var(--ink); border-radius: 0; background: var(--white); color: var(--ink); outline: none; }
.search-wrap input:focus { box-shadow: inset 0 0 0 3px var(--yellow); }
.search-wrap span { position: absolute; right: 14px; top: 5px; font-size: 27px; }
.filter-count { margin-top: 9px; color: var(--muted); font-size: 12px; }
.faq-layout { display: grid; grid-template-columns: 260px minmax(0, 800px); justify-content: space-between; gap: 60px; }
.faq-aside { align-self: start; padding: 22px; border: 1px solid var(--ink); background: var(--yellow); }
.faq-aside > span { font-weight: 900; }
.faq-aside ol { padding-left: 22px; margin: 16px 0 24px; }
.faq-aside li { margin: 7px 0; font-size: 14px; }
.faq-item { border: 1px solid var(--ink); border-bottom: 0; background: var(--white); }
.faq-item:last-of-type { border-bottom: 1px solid var(--ink); }
.faq-item > button { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 20px; border: 0; background: transparent; color: var(--ink); text-align: left; cursor: pointer; font-weight: 800; }
.faq-item button b { display: inline-block; min-width: 38px; color: var(--raspberry); font-size: 12px; }
.faq-item button i { font-style: normal; font-size: 25px; line-height: 1; transition: transform .2s; }
.faq-item.is-open button { background: var(--teal); color: var(--white); }
.faq-item.is-open button b { color: var(--yellow); }
.faq-item.is-open button i { transform: rotate(45deg); }
.faq-answer { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .24s ease; }
.faq-answer > p { overflow: hidden; margin: 0; padding: 0 58px; color: var(--muted); }
.faq-item.is-open .faq-answer { grid-template-rows: 1fr; }
.faq-item.is-open .faq-answer > p { padding-block: 18px 22px; }
.no-results { padding: 28px; border: 1px solid var(--ink); background: var(--white); text-align: center; }

@media (max-width: 900px) {
  .header-inner, .hero-inner, .section-inner, .footer-inner { width: min(100% - 32px, 720px); }
  .site-header { height: 64px; }
  .brand img { width: 40px; height: 40px; }
  .menu-toggle { display: block; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .site-nav { position: fixed; inset: 64px 0 auto 0; display: grid; gap: 0; padding: 12px 16px 18px; border-bottom: 1px solid var(--ink); background: var(--paper); transform: translateY(-130%); opacity: 0; pointer-events: none; transition: transform .22s ease, opacity .22s ease; }
  .site-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .site-nav > a:not(.button) { padding: 12px 4px; border-bottom: 1px solid var(--line); }
  .site-nav > a:not(.button)::after { display: none; }
  .site-nav .button { margin-top: 12px; }
  .hero-inner { grid-template-columns: 1fr; gap: 18px; padding-block: 22px 26px; }
  .hero-copy { max-width: none; }
  h1 { font-size: 38px; line-height: 1.14; }
  .hero-copy > p { margin-bottom: 16px; font-size: 15px; line-height: 1.65; }
  .hero-actions { gap: 18px; }
  .hero-facts { display: none; }
  .hero-media { min-height: 294px; border-left: 0; border-top: 1px solid var(--line); }
  .hero-phone { width: 132px; padding: 5px; }
  .control-tabs { left: max(0px, calc(50% - 166px)); top: 44px; gap: 6px; }
  .control-tabs span { min-width: 92px; padding: 6px 10px; font-size: 11px; box-shadow-width: 3px; }
  .control-tabs span:nth-child(2) { margin-left: 13px; }
  .control-tabs span:nth-child(3) { margin-left: 26px; }
  .media-label { right: max(0px, calc(50% - 174px)); bottom: 28px; }
  .section-inner { padding-block: 54px; }
  .split-heading { display: block; }
  .section-note { margin-top: 10px; }
  .step-rail { grid-template-columns: 1fr 1fr; }
  .step-rail li { min-height: 166px; }
  .step-rail li:nth-child(2) { border-right: 0; }
  .step-rail li:nth-child(-n+2) { border-bottom: 1px solid var(--ink); }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-wide { grid-column: span 2; grid-row: auto; min-height: 330px; }
  .feature-accent { grid-column: span 2; }
  .feature-index { margin-bottom: 28px; }
  .gallery-grid { gap: 14px; }
  .screen-card { padding: 8px; box-shadow: 5px 5px 0 var(--teal); }
  .screen-card-shift { margin-top: 28px; box-shadow-color: var(--raspberry); }
  .screen-card-tall { box-shadow-color: var(--yellow); }
  .link-panels { grid-template-columns: 1fr; }
  .page-hero-grid, .faq-hero .page-hero-grid { grid-template-columns: 1fr; gap: 36px; padding-block: 44px; }
  .page-hero h1 { font-size: 39px; }
  .article-layout, .faq-layout { grid-template-columns: 1fr; gap: 36px; }
  .article-nav { position: static; grid-template-columns: repeat(3, 1fr); }
  .article-nav span { grid-column: 1 / -1; }
  .faq-aside { display: none; }
}

@media (max-width: 560px) {
  .header-inner, .hero-inner, .section-inner, .footer-inner, .narrow { width: calc(100% - 28px); }
  .brand { font-size: 18px; }
  .hero-inner { gap: 12px; padding-block: 16px 20px; }
  .eyebrow { margin-bottom: 9px; }
  .eyebrow span { padding: 3px 7px; font-size: 10px; }
  h1 { margin-bottom: 10px; font-size: 34px; }
  .hero-copy > p { margin-bottom: 13px; font-size: 14px; line-height: 1.55; }
  .hero-actions .button { min-height: 42px; padding: 8px 18px; }
  .hero-actions .text-link { font-size: 13px; }
  .hero-media { min-height: 282px; }
  .hero-phone { width: 122px; }
  .control-tabs { left: 0; }
  .media-label { right: 0; bottom: 24px; }
  .section-inner { padding-block: 46px; }
  .section-heading { margin-bottom: 24px; }
  .section-heading h2 { font-size: 28px; }
  .step-rail { grid-template-columns: 1fr; }
  .step-rail li { min-height: auto; padding: 20px; border-right: 0; border-bottom: 1px solid var(--ink); }
  .step-rail li:nth-child(3) { border-bottom: 1px solid var(--ink); }
  .step-rail li:last-child { border-bottom: 0; }
  .step-rail li > span { margin-bottom: 10px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature, .feature-wide, .feature-accent { grid-column: auto; min-height: 220px; }
  .feature-wide { min-height: 285px; }
  .gallery-grid { grid-template-columns: 1fr; }
  .screen-card, .screen-card-shift { width: min(100%, 340px); margin: 0 auto 12px; }
  .screen-card img { max-height: 510px; }
  .link-panel { min-height: 220px; padding: 26px; }
  .link-panel h3 { font-size: 23px; }
  .final-action-inner { display: block; padding-block: 38px; }
  .final-action h2 { margin-bottom: 24px; font-size: 25px; }
  .page-hero-grid, .faq-hero .page-hero-grid { gap: 28px; padding-block: 34px; }
  .page-hero h1 { font-size: 34px; }
  .mobile-title-line { display: block; }
  .page-hero p { font-size: 15px; }
  .article-nav { grid-template-columns: 1fr 1fr; }
  .article-body > section { padding-left: 28px; padding-bottom: 48px; }
  .article-index { left: -17px; width: 34px; height: 34px; }
  .article-body h2 { font-size: 25px; }
  .check-grid { grid-template-columns: 1fr; }
  .check-grid div { border-right: 0; border-bottom: 1px solid var(--ink); }
  .check-grid div:last-child { border-bottom: 0; }
  .article-figure { grid-template-columns: 1fr; }
  .article-figure img { width: 100%; max-height: 430px; }
  .faq-filter-box { padding: 18px; box-shadow: 6px 6px 0 var(--raspberry); }
  .faq-item > button { padding: 16px 14px; }
  .faq-item button span { display: grid; grid-template-columns: 32px 1fr; align-items: start; }
  .faq-answer > p { padding-inline: 46px 16px; }
  .faq-item.is-open .faq-answer > p { padding-block: 16px 20px; }
}

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