/* roulang page: index */
:root {
  --copper: #B8612D;
  --copper-deep: #8C451C;
  --green: #1F7A62;
  --steel: #6E757C;
  --paper: #F7F4EE;
  --paper-2: #EFEAE2;
  --ink: #24211D;
  --muted: #5C564E;
  --line: #D9D1C6;
  --paint: #1C1A17;
  --asphalt: #2C3034;
  --light: #F6F1E8;
  --brake: #A33B32;
  --radius-ctl: 2px;
  --radius-card: 4px;
  --shadow: 0 1px 0 rgba(36, 33, 29, .04);
  --max: 1180px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
}
img { max-width: 100%; display: block; border: 0; }
a { color: var(--copper-deep); text-decoration: none; }
a:hover { color: var(--copper); }
button, input, select, textarea { font: inherit; color: inherit; letter-spacing: 0; }
button { cursor: pointer; }
h1, h2, h3, p { letter-spacing: 0; }
h1, h2, h3 { line-height: 1.35; margin: 0 0 .6em; font-weight: 700; }
h1 { font-size: 44px; line-height: 1.25; }
h2 { font-size: 28px; }
h3 { font-size: 18px; margin-bottom: .4em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; }
.num, .metric b, .stat b, .node-index, time { font-variant-numeric: tabular-nums; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--paper);
  border-top: 3px solid var(--copper);
  border-bottom: 1px solid var(--line);
}
.nav-top { display: flex; align-items: center; gap: 14px; min-height: 64px; }
.logo { color: var(--ink); font-weight: 700; font-size: 20px; white-space: nowrap; }
.logo:hover { color: var(--copper-deep); }
.nav-phone { color: var(--muted); font-variant-numeric: tabular-nums; margin-left: 8px; }
.nav-top .btn-cta { margin-left: auto; }
.nav-toggle {
  display: none;
  min-height: 44px;
  min-width: 44px;
  padding: 0 12px;
  border: 1px solid var(--copper);
  border-radius: var(--radius-ctl);
  background: transparent;
  color: var(--copper-deep);
}
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 18px; border-top: 1px solid var(--line); }
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ink);
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--copper-deep); }
.site-nav a.is-active { color: var(--copper-deep); border-bottom-color: var(--copper); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: var(--radius-ctl);
  border: 1px solid transparent;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.btn-cta { background: var(--brake); border-color: var(--brake); color: var(--light); }
.btn-cta:hover { background: #8C322A; color: var(--light); }
.btn-cta:active { background: #742820; }
.btn-line { background: transparent; border-color: var(--copper); color: var(--copper-deep); }
.btn-line:hover { background: var(--copper); color: var(--light); }
.btn-line:active { background: var(--copper-deep); color: var(--light); }
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 2px;
}
.hero { position: relative; overflow: hidden; padding: 36px 0 28px; }
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-bg::after { content: ""; position: absolute; inset: 0; background: rgba(247, 244, 238, .92); }
.hero .container { position: relative; z-index: 1; }
.ticks { height: 8px; margin-bottom: 14px; background-image: repeating-linear-gradient(90deg, var(--copper) 0 1px, transparent 1px 12px); opacity: .5; }
.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 8px;
  margin-bottom: 10px;
  border: 1px solid var(--copper);
  border-radius: var(--radius-ctl);
  color: var(--copper-deep);
  font-size: 13px;
}
.badge-green { border-color: var(--green); color: var(--green); }
.lead { max-width: 40em; margin-bottom: 1.1em; }
.hero-actions, .carousel-bar, .cta-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.hero-actions { margin-top: 8px; }
.slide { display: none; }
.slide.is-active { display: block; }
.slide-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: 28px; align-items: center; min-height: 320px; }
.frame-title { margin: 0 0 .5em; font-size: 28px; font-weight: 700; line-height: 1.35; }
.metric-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.metric {
  min-height: 112px;
  padding: 16px;
  background: var(--paint);
  color: var(--light);
  border: 1px solid var(--asphalt);
  border-radius: var(--radius-card);
}
.metric b { display: block; color: var(--copper); font-size: 26px; line-height: 1.2; }
.metric .metric-text { font-size: 18px; }
.metric span { display: block; margin-top: 8px; color: #D9D1C6; font-size: 14px; line-height: 1.5; }
.carousel-bar { margin-top: 18px; }
.dot { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: var(--radius-ctl); background: transparent; }
.dot[aria-current="true"] { background: var(--copper); border-color: var(--copper); }
section[id] { scroll-margin-top: 120px; }
.section { padding: 56px 0; }
.section-loose { padding: 80px 0; }
.bg-paper { background: var(--paper); }
.bg-soft { background: var(--paper-2); }
.split, .case-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 32px; align-items: center; }
.split-media img, .case-media img, .product-media img { width: 100%; height: 260px; object-fit: cover; border-radius: var(--radius-card); }
.matrix { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 16px; }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 16px 16px 14px;
  transition: border-color .2s ease, transform .2s ease;
}
.card:hover { border-color: var(--copper); transform: translateY(-2px); }
.card p { margin: 0; font-size: 16px; }
.card-wide:nth-child(1) { grid-column: span 7; }
.card-wide:nth-child(2) { grid-column: span 5; }
.card-narrow { grid-column: span 3; }
.product-row {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 28px;
  align-items: center;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.product-row.reverse .product-media { order: 2; }
.product-copy p { margin-bottom: 0; max-width: 40em; }
.compare { display: grid; grid-template-columns: 1fr 16px 1fr; gap: 8px; align-items: stretch; }
.compare-col { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-card); padding: 8px 16px 10px; }
.compare-rule { width: 2px; margin: 0 auto; background: var(--copper); }
.plain-list { list-style: none; }
.plain-list li { position: relative; padding: 10px 0 10px 14px; border-bottom: 1px solid var(--line); }
.plain-list li::before { content: ""; position: absolute; left: 0; top: 1.2em; width: 6px; height: 1px; background: var(--copper); }
.case { background: var(--paint); color: var(--light); }
.case h2, .case p, .case li { color: var(--light); }
.case .muted { color: #D9D1C6; }
.track { position: relative; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; list-style: none; margin-top: 8px; }
.track::before { content: ""; position: absolute; top: 26px; left: 0; right: 0; height: 1px; background: var(--copper); }
.node { position: relative; padding-top: 46px; }
.node::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 0;
  width: 11px;
  height: 11px;
  border: 2px solid var(--copper);
  border-radius: var(--radius-ctl);
  background: var(--paper);
}
.node-index { color: var(--copper); font-weight: 700; }
.node p { font-size: 16px; }
.story {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.story img { width: 96px; height: 96px; object-fit: cover; border-radius: var(--radius-card); }
.story p { margin: 0; }
.stat-section { background: var(--asphalt); color: var(--light); }
.stat-section h2, .stat-section p { color: var(--light); }
.statbar { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.stat { padding: 8px 0; border-top: 1px solid rgba(217, 209, 198, .35); }
.stat b { display: block; color: var(--copper); font-size: 32px; line-height: 1.2; }
.stat span { display: block; color: #D9D1C6; font-size: 14px; }
.reviews { display: grid; grid-template-columns: 1.4fr .8fr; gap: 12px; }
.review:first-child { grid-row: span 2; }
.review { background: #fff; }
.review .who { margin: 0 0 6px; color: var(--copper-deep); font-size: 14px; }
.review p:last-child { margin: 0; }
.news-item {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.news-item img { width: 168px; height: 112px; object-fit: cover; border-radius: var(--radius-card); }
.news-item h3 { margin: 4px 0; }
.news-item p { margin: 0; font-size: 16px; }
.news-log { margin-top: 22px; padding-top: 8px; border-top: 1px solid var(--line); }
.news-log li { display: flex; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--line); list-style: none; }
.checks { display: grid; grid-template-columns: 1fr 1fr; gap: 0 28px; }
.check { display: grid; grid-template-columns: 14px minmax(0, 1fr); gap: 10px; padding: 14px 0; border-top: 1px solid var(--line); }
.check i { width: 10px; height: 10px; margin-top: 10px; border: 1px solid var(--green); border-radius: var(--radius-ctl); }
.check p { margin: 0; font-size: 16px; }
.qa-row { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 18px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.qa-row dt { font-weight: 700; }
.qa-row dd { margin: 0; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-btn {
  width: 100%;
  min-height: 44px;
  padding: 12px 0;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
  background: transparent;
  border: 0;
  font-weight: 700;
}
.faq-btn:hover { color: var(--copper-deep); }
.faq-panel { padding: 0 0 14px; }
.faq-panel[hidden] { display: none; }
.faq-state { color: var(--copper); font-weight: 400; white-space: nowrap; }
.cta-band {
  background-color: var(--paint);
  background-image: linear-gradient(90deg, rgba(28, 26, 23, .94), rgba(44, 48, 52, .9)), url("/assets/images/c70ec41fd572960c.webp");
  background-size: cover;
  background-position: center;
  color: var(--light);
}
.cta-band h2, .cta-band p { color: var(--light); }
.cta-inner { display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.demand-form, .form-success {
  max-width: 880px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}
.form-success { border-color: var(--green); background: var(--paper); }
.form-success strong { color: var(--green); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 20px; }
.field-span { grid-column: 1 / -1; }
label { display: block; margin-bottom: 6px; font-size: 15px; }
input, select, textarea {
  width: 100%;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-ctl);
  background: #fff;
  font-size: 16px;
}
textarea { min-height: 140px; resize: vertical; }
select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--copper-deep) 50%), linear-gradient(135deg, var(--copper-deep) 50%, transparent 50%);
  background-position: calc(100% - 18px) 52%, calc(100% - 12px) 52%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 32px;
}
.field-error { color: var(--brake); font-size: 14px; line-height: 1.6; margin: 6px 0 0; }
.field-error:empty { display: none; }
.form-actions { margin-top: 4px; }
.site-footer { background: var(--paint); color: var(--light); padding: 36px 0 20px; }
.site-footer a { color: var(--light); }
.site-footer a:hover { color: var(--copper); }
.footer-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: 24px; }
.footer-name { margin: 0 0 8px; font-size: 20px; font-weight: 700; }
.footer-links { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 4px 16px; }
.footer-links a { display: inline-flex; min-height: 36px; align-items: center; }
.footer-base { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 22px; padding-top: 14px; border-top: 1px solid rgba(217, 209, 198, .3); color: #D9D1C6; font-size: 14px; }
.footer-base p { margin: 0; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media (max-width: 1280px) {
  .container { width: min(var(--max), calc(100% - 36px)); }
}
@media (max-width: 1024px) {
  h1 { font-size: 40px; }
  h2 { font-size: 26px; }
  .slide-grid, .split, .case-grid { gap: 22px; }
  .card-narrow { grid-column: span 6; }
}
@media (max-width: 768px) {
  body { font-size: 16px; }
  h1 { font-size: 30px; }
  h2, .frame-title { font-size: 22px; }
  .section { padding: 40px 0; }
  .section-loose { padding: 48px 0; }
  section[id] { scroll-margin-top: 76px; }
  .nav-phone { display: none; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .site-nav { display: none; flex-direction: column; gap: 0; padding-bottom: 8px; }
  .site-nav.is-open { display: flex; }
  .slide-grid, .split, .case-grid, .product-row, .product-row.reverse, .reviews, .form-grid, .checks, .qa-row, .cta-inner, .footer-grid { grid-template-columns: 1fr; }
  .product-row.reverse .product-media { order: 0; }
  .card-wide, .card-narrow { grid-column: span 12; }
  .compare { grid-template-columns: 1fr; }
  .compare-rule { width: 100%; height: 2px; margin: 4px 0; }
  .track { grid-template-columns: 1fr; }
  .track::before { top: 0; bottom: 0; left: 4px; width: 1px; height: auto; right: auto; }
  .node { padding: 0 0 18px 22px; }
  .node::before { top: 6px; left: 0; }
  .statbar { grid-template-columns: 1fr 1fr; }
  .review:first-child { grid-row: auto; }
  .news-item { grid-template-columns: 1fr; }
  .news-item img { width: 100%; height: 180px; }
  .field-span { grid-column: auto; }
}
@media (max-width: 520px) {
  .container { width: calc(100% - 32px); }
  .logo { font-size: 16px; }
  .metric b { font-size: 22px; }
  .stat b { font-size: 26px; }
  .story { grid-template-columns: 72px minmax(0, 1fr); }
  .story img { width: 72px; height: 72px; }
  .hero-actions .btn, .cta-actions .btn, .form-actions .btn { width: 100%; }
}
@media (max-width: 375px) {
  .container { width: calc(100% - 24px); }
  .nav-top { gap: 8px; }
}