/* =========================================================
   贝森奇品牌 · 企业官网
   设计风格：简约大气 / 留白 / 高级感
   配色：墨黑 + 暖金点缀 + 米白底
   ========================================================= */

:root {
  --ink: #1a1714;
  --ink-soft: #33302b;
  --paper: #fdfcfa;
  --paper-warm: #faf7f1;
  --paper-warm-2: #f3eee4;
  --muted: #6f6a61;
  --muted-light: #a39e94;
  --line: #e9e3d9;
  --gold: #b0894c;
  --gold-soft: #c6a877;
  --gold-deep: #876a36;
  --gold-light: #d9c39a;
  --sage: #7c886a;
  --sage-soft: #b9c4a6;
  --shadow-sm: 0 2px 10px rgba(20, 20, 20, 0.06);
  --shadow-md: 0 12px 40px rgba(20, 20, 20, 0.10);
  --radius: 14px;
  --maxw: 1200px;
  --nav-h: 76px;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", Georgia, serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- 通用排版 ---------- */
.eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--sage);
  font-weight: 600;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--sage);
  margin-right: 12px;
  vertical-align: middle;
  transform: translateY(-2px);
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.25;
  color: var(--ink);
}
.section-sub {
  color: var(--muted);
  font-size: 16px;
  max-width: 620px;
  margin-top: 16px;
}
.section-head { margin-bottom: 56px; }
.section-head.center { text-align: center; }
.section-head.center .section-sub { margin-left: auto; margin-right: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all 0.28s ease;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--ink);
  color: #fff;
}
.btn-primary:hover { background: var(--gold-deep); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-gold {
  background: var(--gold);
  color: #fff;
}
.btn-gold:hover { background: var(--gold-deep); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
  background: transparent;
}
.btn-ghost:hover { border-color: var(--ink); background: var(--ink); color: #fff; }
.btn .arrow { transition: transform 0.28s ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.logo span { color: var(--gold); margin-left: 2px; }
.logo-img {
  height: 38px;
  width: auto;
  display: block;
}
/* 顶部导航 LOGO：用浅卡其底+香槟金边把它从毛玻璃 header 中托出 */
.site-header .logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 12px;
  background: rgba(253, 252, 250, 0.78);
  border: 1px solid rgba(176, 137, 76, 0.18);
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(26, 23, 20, 0.06);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.site-header .logo:hover {
  border-color: rgba(176, 137, 76, 0.32);
  box-shadow: 0 4px 14px rgba(26, 23, 20, 0.10);
  transform: translateY(-1px);
}
.site-header .logo .logo-img {
  height: 46px;
  filter: drop-shadow(0 2px 4px rgba(26,23,20,0.08));
}
@media (max-width: 720px) {
  .logo-img { height: 32px; }
  .site-header .logo { padding: 4px 8px; border-radius: 8px; }
  .site-header .logo .logo-img { height: 38px; }
}

/* ---------- Hero 产品图 ---------- */
.hero-wrap { position: relative; }
.hero-visual {
  margin-top: 48px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  max-width: 520px;
  border: 1px solid var(--line);
}
.hero-visual img {
  width: 100%;
  height: auto;
  display: block;
}
@media (min-width: 1100px) {
  .hero-visual {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 400px;
    margin-top: 0;
    max-width: none;
  }
}

/* ---------- 分栏图片 ---------- */
.visual-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  display: block;
}
/* 完整展示产品（不裁切）：用于单支产品图 */
.visual-img--contain {
  object-fit: contain;
  background:
    radial-gradient(circle at 50% 38%, rgba(176,137,76,0.10), rgba(243,239,231,0) 62%),
    var(--paper-warm-2);
  padding: 14px;
  box-shadow: inset 0 0 0 1px var(--line);
}

/* ---------- 联系页图片 ---------- */
.map-img {
  margin-top: 24px;
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  display: block;
}

.nav-links {
  display: flex;
  gap: 38px;
  align-items: center;
}
.nav-links a {
  font-size: 15px;
  color: var(--ink-soft);
  position: relative;
  padding: 6px 0;
  transition: color 0.2s ease;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--sage);
  transition: width 0.28s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--ink); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--ink);
  transition: all 0.3s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 页面通用区块 ---------- */
.page { padding-top: var(--nav-h); }
.section { padding: 110px 0; }
.section.alt { background: var(--paper-warm); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(176, 137, 76, 0.10), transparent 60%),
    linear-gradient(180deg, #fbfaf7 0%, #ffffff 100%);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  right: -120px; top: 50%;
  transform: translateY(-50%);
  width: 520px; height: 520px;
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: 0.6;
}
.hero::after {
  content: "";
  position: absolute;
  right: 40px; top: 50%;
  transform: translateY(-50%);
  width: 360px; height: 360px;
  background: radial-gradient(circle at 30% 30%, rgba(176,137,76,0.18), transparent 70%);
  border-radius: 50%;
}
.hero-inner { position: relative; z-index: 2; max-width: 720px; }
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(40px, 6.5vw, 76px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.hero h1 .accent { color: var(--gold); }
.hero p.lead {
  margin-top: 26px;
  font-size: clamp(16px, 2vw, 20px);
  color: var(--muted);
  max-width: 560px;
}
.hero-actions { margin-top: 40px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero-meta {
  margin-top: 64px;
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}
.hero-meta .num {
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
}
.hero-meta .lbl { font-size: 14px; color: var(--muted); margin-top: 8px; }

/* ---------- 首页轮播图 ---------- */
.hero-carousel {
  position: relative;
  min-height: 92vh;
  max-height: 900px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--ink);
}
.hero-carousel .slides {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-carousel .slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.1s ease, transform 6s ease;
  transform: scale(1.02);
}
.hero-carousel .slide.active {
  opacity: 1;
  transform: scale(1);
}
.hero-carousel .slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.hero-carousel .overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(20,20,20,0.78) 0%, rgba(20,20,20,0.42) 50%, rgba(20,20,20,0.12) 100%),
    linear-gradient(180deg, rgba(20,20,20,0.25) 0%, rgba(20,20,20,0.05) 40%, rgba(20,20,20,0.35) 100%);
  z-index: 1;
}
.hero-carousel .container {
  position: relative;
  z-index: 2;
}
.hero-carousel .hero-inner { max-width: 640px; }
.hero-carousel .eyebrow,
.hero-carousel h1,
.hero-carousel p.lead,
.hero-carousel .hero-meta .num,
.hero-carousel .hero-meta .lbl { color: #fff; }
.hero-carousel .eyebrow { color: var(--sage-soft); }
.hero-carousel .eyebrow::before { background: var(--sage-soft); }
.hero-carousel h1 .accent { color: var(--gold-light); }
.hero-carousel .hero-actions .btn-primary {
  background: var(--gold);
  border-color: var(--gold);
  color: #fff;
}
.hero-carousel .hero-actions .btn-primary:hover {
  background: var(--gold-deep);
  border-color: var(--gold-deep);
}
.hero-carousel .hero-actions .btn-ghost {
  border-color: rgba(255,255,255,0.55);
  color: #fff;
}
.hero-carousel .hero-actions .btn-ghost:hover {
  background: rgba(255,255,255,0.12);
  border-color: #fff;
}
.hero-carousel .hero-meta .num { color: var(--gold-light); }
.hero-carousel .hero-meta .lbl { color: rgba(255,255,255,0.82); }
.carousel-dots {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 3;
}
.carousel-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.45);
  cursor: pointer;
  transition: all 0.3s ease;
  padding: 0;
}
.carousel-dots button.active {
  background: var(--sage);
  width: 30px;
  border-radius: 5px;
}
.carousel-arrows {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 3;
  pointer-events: none;
  transform: translateY(-50%);
}
.carousel-arrows button {
  pointer-events: auto;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.35);
  background: rgba(20,20,20,0.22);
  color: #fff;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(4px);
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.carousel-arrows button:hover {
  background: rgba(20,20,20,0.45);
  border-color: rgba(255,255,255,0.7);
}
@media (max-width: 720px) {
  .hero-carousel { min-height: 80vh; }
  .carousel-arrows { display: none; }
  .carousel-dots { bottom: 22px; }
}

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 28px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 38px 32px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--gold-soft);
}
.card .icon {
  width: 54px; height: 54px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: var(--paper-warm-2);
  color: var(--gold-deep);
  margin-bottom: 22px;
}
.card h3 {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  margin-bottom: 12px;
}
.card p { color: var(--muted); font-size: 15px; }

/* ---------- 关于：价值/使命 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split .visual {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.info-card {
  position: absolute;
  left: 18px; right: 18px; bottom: 18px;
  background: rgba(253, 252, 250, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 16px 18px;
}
.info-card .t {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 8px 0;
  font-size: 14px;
  border-bottom: 1px solid var(--line);
}
.info-card .t:last-child { border-bottom: none; }
.info-card .t strong { color: var(--ink-soft); font-weight: 600; }
.info-card .t span { color: var(--ink); }
.feature-list { margin-top: 28px; }
.feature-list li {
  display: flex; gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.feature-list li:last-child { border-bottom: none; }
.feature-list .tick {
  flex: none;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--sage);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px;
}
.feature-list strong { color: var(--ink); font-weight: 600; }
.feature-list span { color: var(--muted); }

/* ---------- 时间线 ---------- */
.timeline { position: relative; margin-top: 20px; }
.timeline::before {
  content: "";
  position: absolute; left: 8px; top: 6px; bottom: 6px;
  width: 2px; background: var(--line);
}
.timeline-item { position: relative; padding: 0 0 36px 40px; }
.timeline-item::before {
  content: "";
  position: absolute; left: 0; top: 6px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--paper); border: 3px solid var(--gold);
}
.timeline-item .year {
  font-family: var(--serif);
  font-weight: 700;
  color: var(--gold-deep);
  font-size: 18px;
}
.timeline-item h4 { font-size: 17px; margin: 4px 0 6px; }
.timeline-item p { color: var(--muted); font-size: 15px; }

/* ---------- 流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.step {
  text-align: center;
  padding: 34px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  transition: all 0.3s ease;
}
.step:hover { border-color: var(--gold-soft); transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.step .no {
  font-family: var(--serif);
  font-size: 40px; font-weight: 700;
  color: var(--gold-soft);
  line-height: 1;
}
.step h4 { margin: 16px 0 10px; font-size: 18px; }
.step p { color: var(--muted); font-size: 14px; }

/* ---------- 引用/客户 ---------- */
.quote {
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}
.quote p {
  font-family: var(--serif);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.5;
  color: var(--ink);
}
.quote .by { margin-top: 26px; color: var(--muted); font-size: 15px; }

/* ---------- CTA 横幅 ---------- */
.cta {
  background: var(--ink);
  color: #fff;
  border-radius: 20px;
  padding: 72px 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(600px 300px at 50% -20%, rgba(176,137,76,0.35), transparent 70%);
}
.cta > * { position: relative; z-index: 2; }
.cta h2 { font-family: var(--serif); font-size: clamp(28px, 4vw, 40px); font-weight: 600; }
.cta p { color: rgba(255,255,255,0.72); margin: 16px auto 32px; max-width: 540px; }

/* ---------- 联系表单 ---------- */
.contact-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 56px; }
.form-group { margin-bottom: 22px; }
.form-group label { display: block; font-size: 14px; margin-bottom: 8px; color: var(--ink-soft); font-weight: 500; }
.form-control {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 15px;
  font-family: var(--sans);
  background: var(--paper);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-control:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(176,137,76,0.12);
}
textarea.form-control { resize: vertical; min-height: 140px; }
.form-note { font-size: 14px; color: var(--gold-deep); margin-top: 12px; min-height: 20px; }

.contact-info { background: var(--paper-warm); border: 1px solid var(--line); border-radius: var(--radius); padding: 40px 34px; }
.contact-info h4 { font-family: var(--serif); font-size: 20px; margin-bottom: 22px; }
.contact-info .row { display: flex; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.contact-info .row:last-child { border-bottom: none; }
.contact-info .row .ic { color: var(--gold-deep); flex: none; }
.contact-info .row .t { font-size: 14px; }
.contact-info .row .t strong { display: block; color: var(--ink); margin-bottom: 2px; }
.contact-info .row .t span { color: var(--muted); }

.map-placeholder {
  margin-top: 24px;
  aspect-ratio: 16 / 7;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(45deg, #f3efe7 0 18px, #efe9dd 18px 36px);
  display: flex; align-items: center; justify-content: center;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- 页脚 ---------- */
.site-footer { background: var(--ink); color: rgba(255,255,255,0.78); padding: 72px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; }
.site-footer .logo { color: #fff; font-size: 24px; }
.site-footer .logo span { color: var(--gold-soft); }
.site-footer p { color: rgba(255,255,255,0.6); margin-top: 16px; font-size: 14px; max-width: 320px; }
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 18px; letter-spacing: 0.04em; }
.site-footer .col a { display: block; color: rgba(255,255,255,0.62); padding: 7px 0; font-size: 14px; transition: color 0.2s ease; }
.site-footer .col a:hover { color: var(--gold-soft); }
.footer-bottom {
  margin-top: 56px; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 13px; color: rgba(255,255,255,0.45);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.footer-bottom .beian {
  flex-basis: 100%; text-align: center; margin-top: 4px;
}
.footer-bottom .beian a {
  color: rgba(255,255,255,0.55); text-decoration: none;
}
.footer-bottom .beian a:hover { color: var(--gold-light); }

/* ---------- 进入动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .split, .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .section { padding: 80px 0; }
  .nav-links {
    position: fixed;
    top: var(--nav-h); right: 0;
    width: 70%; max-width: 320px;
    height: calc(100vh - var(--nav-h));
    background: var(--paper);
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 28px;
    border-left: 1px solid var(--line);
    transform: translateX(110%);
    transition: transform 0.32s ease;
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { padding: 12px 0; width: 100%; border-bottom: 1px solid var(--line); }
  .nav-toggle { display: flex; }
  .grid-3, .grid-4, .grid-2, .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-meta { gap: 28px; }
  .cta { padding: 52px 28px; }
  .container { padding: 0 20px; }

  /* —— 手机端专项优化 —— */
  /* 轮播：竖屏下横向渐变会让右侧文字看不清，改为整体压暗 */
  .hero-carousel { min-height: 84vh; }
  .hero-carousel .overlay {
    background:
      linear-gradient(180deg, rgba(20,20,20,0.55) 0%, rgba(20,20,20,0.32) 45%, rgba(20,20,20,0.62) 100%);
  }
  .hero-carousel .hero-inner { max-width: 100%; }
  .hero-carousel .eyebrow { font-size: 12px; }
  /* 按钮在窄屏占满整行 */
  .hero-actions { gap: 12px; }
  .hero-actions .btn,
  .cta .btn { width: 100%; justify-content: center; }
  /* 数据区换行并缩小，避免拥挤 */
  .hero-meta { width: 100%; gap: 18px 28px; }
  .hero-meta .num { font-size: 30px; }
  /* 分栏图片在手机端不要过高 */
  .split .visual { aspect-ratio: 16 / 11; }
  .split .reverse .visual { aspect-ratio: 16 / 11; }

  /* 移动端菜单遮罩 + 锁定背景滚动 */
  body.nav-open { overflow: hidden; }
  .nav-scrim {
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    background: rgba(20, 20, 20, 0.32);
    z-index: 90;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }
  body.nav-open .nav-scrim { opacity: 1; visibility: visible; }
}

/* ---------- 超小屏（≤480px）进一步收紧 ---------- */
@media (max-width: 480px) {
  .section { padding: 60px 0; }
  .section-head { margin-bottom: 40px; }
  .hero h1 { font-size: clamp(30px, 8.6vw, 38px); }
  .hero p.lead { font-size: 15px; margin-top: 18px; }
  .section-title { font-size: 26px; }
  .section-sub { font-size: 15px; }
  .hero-meta { gap: 16px 22px; }
  .hero-meta .num { font-size: 26px; }
  .hero-meta .lbl { font-size: 12px; }
  .cta { padding: 44px 22px; }
  .cta h2 { font-size: 26px; }
  .cta p { font-size: 14px; }
  .card { padding: 30px 24px; }
  .card h3 { font-size: 19px; }
  .contact-info { padding: 32px 24px; }
  .contact-info h4 { font-size: 18px; }
  .step { padding: 28px 22px; }
  .quote { padding: 34px 26px; }
  .container { padding: 0 18px; }
  .timeline::before { left: 14px; }
  .timeline-item { padding-left: 38px; }
  /* 联系页浮动信息卡在超小屏更紧凑，图片比例恢复以容纳卡片 */
  .split .visual { aspect-ratio: 4 / 3; }
  .info-card { left: 12px; right: 12px; bottom: 12px; padding: 12px 14px; }
  .info-card .t { flex-direction: column; align-items: flex-start; gap: 1px; padding: 6px 0; }
  /* 表单输入框更贴合窄屏 */
  .form-control { padding: 13px 14px; font-size: 16px; }
}