:root {
  --guide-ink: #17212b;
  --guide-muted: #526575;
  --guide-line: #cfdae3;
  --guide-paper: #ffffff;
  --guide-soft: #eef7fd;
  --guide-accent: #176b9b;
  --guide-dark: #10263a;
  --guide-shell: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--guide-ink); background: var(--guide-paper); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.guide-shell { width: min(calc(100% - 48px), var(--guide-shell)); margin: 0 auto; }

.guide-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid rgb(207 218 227 / 0.82); background: rgb(255 255 255 / 0.94); backdrop-filter: blur(18px); }
.guide-header > div { display: flex; min-height: 76px; align-items: center; justify-content: space-between; gap: 32px; }
.guide-brand { flex: 0 0 auto; }
.guide-brand img { width: 158px; height: auto; }
.guide-nav { display: flex; align-items: center; gap: 26px; color: #334858; font-size: 14px; font-weight: 700; }
.guide-nav a:last-child { display: inline-flex; min-height: 38px; align-items: center; padding: 0 15px; border: 1px solid var(--guide-accent); border-radius: 6px; color: var(--guide-accent); }

.guide-hero { position: relative; display: grid; min-height: 560px; align-items: end; overflow: hidden; color: #fff; background-position: center; background-size: cover; }
.guide-hero::before { position: absolute; inset: 0; background: linear-gradient(90deg, rgb(10 27 40 / 0.9) 0%, rgb(10 27 40 / 0.62) 52%, rgb(10 27 40 / 0.18) 100%); content: ""; }
.guide-hero.price { background-image: url("/assets/products/p1-2.webp"); }
.guide-hero.install { background-image: url("/assets/products/p2-1.webp"); }
.guide-hero.selfbuild { background-image: url("/assets/products/p3-1.webp"); }
.guide-hero.maintenance { background-image: url("/assets/misc/factory.webp"); }
.guide-hero.facts { background-image: url("/assets/backgrounds/elevator-blueprint-relief.webp"); }
.guide-hero > div { position: relative; z-index: 1; padding: 82px 0 76px; }
.guide-breadcrumb { display: flex; flex-wrap: wrap; gap: 9px; margin: 0 0 24px; color: #c5d9e7; font-size: 13px; }
.guide-breadcrumb span::before { margin-right: 9px; content: "/"; }
.guide-kicker { margin: 0 0 14px; color: #a6dbf6; font-size: 14px; font-weight: 900; }
.guide-hero h1 { max-width: 820px; margin: 0; font-size: 52px; line-height: 1.16; }
.guide-hero .lead { max-width: 760px; margin: 22px 0 0; color: #d8e5ee; font-family: "SimSun", "Songti SC", serif; font-size: 19px; line-height: 1.9; }
.guide-meta { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 26px; color: #b7cad7; font-size: 13px; }

.answer-band { border-bottom: 1px solid var(--guide-line); background: var(--guide-soft); }
.answer-band > div { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 34px; padding: 44px 0; }
.answer-band strong { color: var(--guide-accent); font-size: 18px; }
.answer-band p { margin: 0; font-family: "SimSun", "Songti SC", serif; font-size: 19px; line-height: 1.95; }

.guide-content { display: grid; min-width: 0; grid-template-columns: minmax(0, 1fr) 270px; gap: 72px; padding: 72px 0 88px; }
.guide-article { min-width: 0; }
.guide-article section { padding: 0 0 58px; }
.guide-article section + section { padding-top: 10px; border-top: 1px solid var(--guide-line); }
.guide-article h2 { margin: 0 0 22px; padding-top: 48px; font-size: 30px; line-height: 1.3; }
.guide-article h3 { margin: 30px 0 12px; font-size: 20px; }
.guide-article p, .guide-article li, .guide-article td, .guide-article th { font-family: "SimSun", "Songti SC", serif; font-size: 17px; line-height: 1.95; }
.guide-article p { margin: 0 0 18px; }
.guide-article a { color: var(--guide-accent); text-decoration: underline; text-underline-offset: 3px; }
.guide-article ul, .guide-article ol { margin: 0; padding-left: 1.4em; }
.guide-article li + li { margin-top: 8px; }
.guide-note { margin: 28px 0; padding: 20px 22px; border-left: 4px solid var(--guide-accent); background: var(--guide-soft); }
.guide-note strong { display: block; margin-bottom: 7px; color: var(--guide-accent); }

.guide-table-wrap { width: 100%; max-width: 100%; overflow-x: auto; border-top: 2px solid var(--guide-ink); }
.guide-table { width: 100%; min-width: 660px; border-collapse: collapse; }
.guide-table th, .guide-table td { padding: 15px 14px; border-bottom: 1px solid var(--guide-line); text-align: left; vertical-align: top; }
.guide-table th { color: var(--guide-ink); background: var(--guide-soft); font-family: inherit; font-weight: 900; }

.guide-aside { align-self: start; position: sticky; top: 108px; }
.guide-aside h2 { margin: 0 0 16px; font-size: 16px; }
.guide-aside nav { display: grid; border-top: 1px solid var(--guide-line); }
.guide-aside nav a { padding: 13px 0; border-bottom: 1px solid var(--guide-line); color: var(--guide-muted); font-size: 14px; line-height: 1.5; }
.guide-aside nav a:hover { color: var(--guide-accent); }
.guide-aside .guide-call { display: grid; gap: 6px; margin-top: 28px; padding: 20px 0 0; border-top: 3px solid var(--guide-accent); }
.guide-aside .guide-call span { color: var(--guide-muted); font-size: 13px; }
.guide-aside .guide-call strong { color: var(--guide-accent); font-size: 25px; }

.guide-faq details { border-top: 1px solid var(--guide-line); }
.guide-faq details:last-child { border-bottom: 1px solid var(--guide-line); }
.guide-faq summary { padding: 18px 0; font-size: 18px; font-weight: 900; cursor: pointer; }
.guide-faq details p { padding: 0 0 20px; color: var(--guide-muted); }
.guide-sources ol { display: grid; gap: 12px; }
.guide-sources li { color: var(--guide-muted); }
.guide-sources p:last-child { margin-top: 22px; padding: 18px 20px; border: 1px solid var(--guide-line); background: #f8fbfd; color: var(--guide-muted); }
.guide-related { background: #f5f9fc; }
.guide-related > div { padding: 66px 0; }
.guide-related h2 { margin: 0 0 25px; font-size: 28px; }
.guide-related-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--guide-line); }
.guide-related-list a { display: grid; gap: 10px; padding: 24px 24px 24px 0; border-bottom: 1px solid var(--guide-line); }
.guide-related-list a + a { padding-left: 24px; border-left: 1px solid var(--guide-line); }
.guide-related-list strong { font-size: 18px; line-height: 1.45; }
.guide-related-list span { color: var(--guide-muted); font-size: 14px; line-height: 1.7; }

.guide-footer { color: #c6d6e1; background: var(--guide-dark); }
.guide-footer > div { display: flex; min-height: 110px; align-items: center; justify-content: space-between; gap: 28px; }
.guide-footer p { margin: 0; font-size: 13px; line-height: 1.7; }
.guide-footer a { color: #a6dbf6; font-weight: 800; }

@media (max-width: 900px) {
  .guide-nav a:not(:first-child):not(:last-child) { display: none; }
  .guide-hero { min-height: 520px; }
  .guide-hero h1 { font-size: 42px; }
  .answer-band > div { grid-template-columns: 1fr; gap: 14px; }
  .guide-content { grid-template-columns: 1fr; gap: 34px; }
  .guide-aside { position: static; }
  .guide-related-list { grid-template-columns: 1fr; }
  .guide-related-list a + a { padding-left: 0; border-left: 0; }
}

@media (max-width: 640px) {
  .guide-shell { width: min(calc(100% - 28px), var(--guide-shell)); }
  .guide-header > div { min-height: 62px; gap: 16px; }
  .guide-brand img { width: 116px; }
  .guide-nav { gap: 12px; font-size: 12px; }
  .guide-nav a:first-child { display: none; }
  .guide-nav a:last-child { min-height: 34px; padding: 0 10px; }
  .guide-hero { min-height: 510px; background-position: 58% center; }
  .guide-hero::before { background: linear-gradient(180deg, rgb(10 27 40 / 0.38) 0%, rgb(10 27 40 / 0.9) 72%); }
  .guide-hero > div { padding: 66px 0 52px; }
  .guide-breadcrumb { font-size: 12px; }
  .guide-hero h1 { font-size: 34px; }
  .guide-hero .lead { font-size: 16px; line-height: 1.8; }
  .guide-meta { gap: 10px; font-size: 12px; }
  .answer-band > div { padding: 32px 0; }
  .answer-band p { font-size: 17px; }
  .guide-content { padding: 52px 0 64px; }
  .guide-article section { padding-bottom: 42px; }
  .guide-article h2 { padding-top: 36px; font-size: 26px; }
  .guide-article p, .guide-article li, .guide-article td, .guide-article th { font-size: 16px; }
  .guide-related > div { padding: 52px 0; }
  .guide-footer > div { min-height: 150px; align-items: flex-start; justify-content: center; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}