:root {
  --ink: #202428;
  --muted: #666d72;
  --accent: #bd4a25;
  --accent-dark: #963617;
  --paper: #ffffff;
  --soft: #f2f3f3;
  --line: #dfe2e3;
  --dark: #20272a;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  background: rgba(255,255,255,.97);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.topbar-inner {
  width: min(var(--max), calc(100% - 48px));
  min-height: 86px;
  margin: auto;
  display: flex;
  align-items: center;
  gap: 28px;
}
.identity { display: flex; align-items: center; gap: 13px; margin-right: auto; }
.identity img { width: 50px; height: 50px; object-fit: contain; }
.identity span { display: grid; line-height: 1.35; }
.identity strong { font-size: 19px; }
.identity small { margin-top: 4px; color: var(--muted); font-size: 13px; letter-spacing: .12em; }
.topnav { display: flex; gap: 26px; font-size: 16px; }
.topnav a:hover, .topnav a:focus-visible { color: var(--accent); }
.top-phone { color: var(--accent); font-size: 19px; font-weight: 800; }
.menu-button { display: none; }

.company-intro {
  width: min(var(--max), calc(100% - 48px));
  margin: 42px auto;
  display: grid;
  grid-template-columns: minmax(180px, 240px) 1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}
.intro-logo {
  min-height: 190px;
  display: grid;
  place-items: center;
  background: var(--soft);
  border: 1px solid var(--line);
}
.intro-logo img { width: min(66%, 155px); }
.label { margin: 0 0 6px; color: var(--accent); font-size: 14px; font-weight: 800; letter-spacing: .22em; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 14px; font-size: clamp(32px, 3.4vw, 44px); line-height: 1.2; }
.company-intro p:not(.label) { max-width: 760px; margin-bottom: 18px; color: #50565a; font-size: 18px; }
.company-intro a, .detail-action {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 22px;
  color: #fff;
  background: var(--accent);
  font-weight: 700;
}
.company-intro a:hover, .detail-action:hover { background: var(--accent-dark); }

.catalog { padding: 72px 0 88px; background: var(--soft); }
.section-heading, .catalog-grid {
  width: min(var(--max), calc(100% - 48px));
  margin-inline: auto;
}
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 32px; }
.section-heading h2 { margin-bottom: 0; font-size: clamp(30px, 3.4vw, 44px); line-height: 1.2; }
.section-heading > p { max-width: 540px; margin-bottom: 4px; color: var(--muted); }
.catalog-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.catalog-card {
  overflow: hidden;
  display: grid;
  grid-template-columns: 52% 1fr;
  min-height: 280px;
  background: #fff;
  border: 1px solid var(--line);
  transition: transform .2s ease, box-shadow .2s ease;
}
.catalog-card:hover, .catalog-card:focus-visible { transform: translateY(-4px); box-shadow: 0 14px 34px rgba(20,26,28,.1); }
.catalog-photo { min-height: 280px; overflow: hidden; background: #e9ebeb; }
.catalog-photo img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.catalog-card > div:last-child { padding: 28px 26px; display: flex; flex-direction: column; align-items: flex-start; }
.catalog-card span { color: var(--accent); font-weight: 800; font-size: 14px; }
.catalog-card h3 { margin: 10px 0 8px; font-size: 28px; line-height: 1.25; }
.catalog-card p { color: var(--muted); }
.catalog-card strong { margin-top: auto; color: var(--accent); font-size: 16px; }

.site-footer { padding: 60px max(24px, calc((100% - var(--max)) / 2)); color: #eef1f1; background: var(--dark); }
.footer-intro { display: flex; align-items: center; gap: 22px; padding-bottom: 30px; border-bottom: 1px solid rgba(255,255,255,.14); }
.footer-intro img { width: 62px; height: 62px; object-fit: contain; background: #fff; }
.footer-intro h2 { margin-bottom: 2px; font-size: 25px; }
.footer-intro p, .copyright { margin-bottom: 0; color: #bfc5c7; }
.footer-contact { display: grid; grid-template-columns: .7fr 1fr .9fr 1.7fr; gap: 28px; padding: 30px 0; }
.footer-contact > * { display: grid; align-content: start; }
.footer-contact small { color: #9ea6a9; }
.footer-contact strong { margin-top: 3px; font-size: 17px; }
.footer-contact a:hover strong { color: #f2946f; }
.copyright { padding-top: 18px; border-top: 1px solid rgba(255,255,255,.14); font-size: 14px; }

.detail-main { width: min(var(--max), calc(100% - 48px)); min-height: 65vh; margin: 44px auto 80px; }
.back-link { display: inline-block; margin-bottom: 30px; color: var(--accent); font-weight: 700; }
.detail-hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: start; padding-bottom: 54px; border-bottom: 1px solid var(--line); }
.detail-hero h1 { margin: 8px 0 18px; }
.detail-subtitle { color: var(--accent); font-weight: 800; letter-spacing: .08em; }
.detail-lead { color: #4f565a; font-size: 20px; }
.feature-list { margin: 0; padding: 30px; background: var(--soft); list-style: none; }
.feature-list li { position: relative; padding: 12px 0 12px 25px; border-bottom: 1px solid var(--line); }
.feature-list li:last-child { border-bottom: 0; }
.feature-list li::before { position: absolute; left: 0; content: "—"; color: var(--accent); font-weight: 900; }
.detail-section { padding-top: 54px; }
.detail-section h2 { margin-bottom: 22px; font-size: 34px; }
.detail-gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.detail-gallery figure { min-height: 380px; margin: 0; padding: 18px; display: grid; place-items: center; background: var(--soft); border: 1px solid var(--line); }
.detail-gallery img { width: 100%; height: 100%; max-height: 460px; object-fit: contain; object-position: center; }
.selection-note { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 34px; background: #f6eee9; border-left: 5px solid var(--accent); }
.selection-note h2 { margin-bottom: 6px; font-size: 27px; }
.selection-note p { margin-bottom: 0; color: #595d5e; }
.detail-action { flex: 0 0 auto; }

@media (max-width: 900px) {
  .topbar-inner { flex-wrap: wrap; padding: 12px 0; }
  .menu-button { display: grid; place-items: center; gap: 5px; width: 42px; height: 42px; padding: 10px; border: 1px solid var(--line); background: #fff; }
  .menu-button span { width: 20px; height: 2px; background: var(--ink); }
  .top-phone { margin-left: 4px; }
  .topnav { display: none; order: 4; width: 100%; padding: 8px 0 4px; }
  .topnav.is-open { display: flex; }
  .catalog-card { grid-template-columns: 1fr; }
  .catalog-photo { min-height: 240px; height: 240px; }
  .footer-contact { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  body { font-size: 17px; }
  .topbar-inner, .company-intro, .section-heading, .catalog-grid, .detail-main { width: min(100% - 28px, var(--max)); }
  .identity strong { font-size: 16px; }
  .identity small { font-size: 11px; }
  .identity img { width: 42px; height: 42px; }
  .top-phone { display: none; }
  .company-intro { margin: 26px auto 38px; grid-template-columns: minmax(110px, 30%) 1fr; gap: 20px; align-items: start; }
  .intro-logo { min-height: 130px; }
  .intro-logo img { width: min(68%, 100px); }
  .company-intro p:not(.label), .detail-lead { font-size: 18px; }
  .company-intro h1 { font-size: 30px; }
  .catalog { padding: 52px 0 60px; }
  .section-heading { display: block; }
  .catalog-grid { grid-template-columns: 1fr; }
  .catalog-photo { height: 230px; }
  .catalog-card > div:last-child { padding: 23px; }
  .footer-intro { align-items: flex-start; }
  .footer-intro h2 { font-size: 20px; }
  .footer-contact { grid-template-columns: 1fr; gap: 18px; }
  .detail-main { margin-top: 28px; }
  .detail-hero { grid-template-columns: 1fr; gap: 28px; }
  .detail-gallery { grid-template-columns: 1fr; }
  .detail-gallery figure { min-height: 270px; }
  .selection-note { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}