/* ============================================================
   丰光视觉 FENGGUANG VISION — 静态网站样式
   黑红色调 · 扁平化 · 响应式（手机 / 平板 / 电脑）
   ============================================================ */

:root {
  --bg: #0a0a0c;
  --bg2: #0f0f12;
  --panel: #141418;
  --line: #232329;
  --red: #e60021;
  --red-deep: #a80018;
  --text: #f2f2f4;
  --muted: #9a9aa2;
  --maxw: 1240px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.red { color: var(--red); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 14px 36px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .25s ease;
}
.btn-red { background: var(--red); color: #fff; border-color: var(--red); }
.btn-red:hover { background: var(--red-deep); border-color: var(--red-deep); }
.btn-ghost { background: transparent; color: var(--text); border-color: #4a4a52; }
.btn-ghost:hover { border-color: var(--red); color: var(--red); }
.btn-white { background: #fff; color: #111; border-color: #fff; }
.btn-white:hover { background: var(--red); color: #fff; border-color: var(--red); }
.btn-sm { padding: 9px 22px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 10, 12, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.logo { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.logo-img { display: block; height: 44px; width: auto; }
.footer-brand .logo-img { height: 38px; }
.logo-mark {
  width: 22px; height: 22px;
  background: var(--red);
  position: relative;
  flex-shrink: 0;
}
.logo-mark::after {
  content: "";
  position: absolute;
  right: -6px; bottom: -6px;
  width: 8px; height: 8px;
  border: 2px solid var(--red);
}
.logo-text { font-size: 20px; font-weight: 800; letter-spacing: 3px; line-height: 1.1; }
.logo-text small {
  display: block;
  font-size: 9px;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 2.5px;
}
.site-nav { display: flex; align-items: center; }
.site-nav > ul { display: flex; align-items: center; gap: 2px; flex-wrap: nowrap; list-style: none; }
.site-nav > ul > li { position: relative; }
.site-nav > ul > li > a,
.drop-link {
  display: block;
  padding: 8px 9px;
  font-size: 13px;
  color: #ffffff;
  letter-spacing: .5px;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color .2s;
  background: none;
  border-top: none; border-left: none; border-right: none;
  font-family: inherit;
  cursor: pointer;
  line-height: 1.7;
}
.site-nav > ul > li > a:hover,
.drop-link:hover { color: var(--red); }
.site-nav > ul > li > a.active { color: var(--red); border-bottom-color: var(--red); font-weight: 600; }
.caret {
  display: inline-block;
  width: 0; height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid currentColor;
  margin-left: 6px;
  vertical-align: 2px;
  transition: transform .25s;
}

/* 二级下拉菜单 */
.drop-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 560px;
  background: var(--bg2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--red);
  padding: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(10px);
  transition: opacity .22s ease, transform .22s ease, visibility .22s;
  z-index: 120;
  box-shadow: 0 24px 48px rgba(0,0,0,.5);
}
.nav-drop:hover .drop-menu,
.nav-drop.open .drop-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.drop-menu li a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  font-size: 13.5px;
  color: #d5d5db;
  transition: background .2s, color .2s;
  white-space: nowrap;
}
.drop-menu li a:hover,
.drop-menu li a.active { background: var(--red); color: #fff; }
.drop-menu li a.active { font-weight: 600; }
.drop-menu .drop-cn { font-weight: 600; letter-spacing: 1px; }
.drop-menu em {
  font-style: normal;
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--muted);
  transition: color .2s;
}
.drop-menu li a:hover em,
.drop-menu li a.active em { color: rgba(255,255,255,.75); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--text); transition: all .25s; }
.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); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  background-size: cover;
  background-position: center;
}
.page-hero {
  position: relative;
  min-height: 58vh;
  display: flex;
  align-items: center;
  background-size: cover;
  background-position: center;
  padding-top: 68px;
}
.page-hero-sm { min-height: 42vh; }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,10,12,.72) 0%, rgba(10,10,12,.55) 45%, rgba(10,10,12,.92) 100%);
}
.hero-content { position: relative; width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 120px 24px 90px; }
.hero-kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 6px;
  color: var(--red);
  border-left: 3px solid var(--red);
  padding-left: 12px;
  margin-bottom: 18px;
  font-weight: 600;
}
.hero h1 { font-size: clamp(34px, 6vw, 66px); font-weight: 800; letter-spacing: 4px; line-height: 1.25; }
.hero p { margin-top: 20px; color: #cfcfd6; font-size: clamp(14px, 1.6vw, 17px); letter-spacing: 1px; }
.hero-btns { margin-top: 36px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero-strip {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  display: flex;
  border-top: 1px solid rgba(255,255,255,.12);
  background: rgba(10,10,12,.55);
}
.hero-strip div {
  flex: 1;
  padding: 18px 10px;
  text-align: center;
  border-right: 1px solid rgba(255,255,255,.1);
}
.hero-strip div:last-child { border-right: none; }
.hero-strip strong { display: block; font-size: 26px; font-weight: 800; color: var(--red); letter-spacing: 1px; }
.hero-strip span { font-size: 12px; color: var(--muted); letter-spacing: 3px; }

/* ---------- 区块 ---------- */
.section { padding: 88px 0; }
.section-dark { background: var(--bg2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { margin-bottom: 48px; }
.section-head.center { text-align: center; }
.kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 5px;
  color: var(--red);
  font-weight: 600;
  margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; letter-spacing: 3px; }
.section-head.center h2::after {
  content: "";
  display: block;
  width: 48px; height: 3px;
  background: var(--red);
  margin: 18px auto 0;
}
.section-head:not(.center) { border-left: 4px solid var(--red); padding-left: 18px; }
.section-lead { color: var(--muted); max-width: 720px; margin: -28px 0 40px; }
.center-btn { text-align: center; margin-top: 48px; }

/* ---------- 服务卡片 ---------- */
.svc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 22px;
}
.svc-card {
  background: var(--panel);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  transition: border-color .25s, transform .25s;
}
.svc-card:hover { border-color: var(--red); transform: translateY(-4px); }
.svc-img { overflow: hidden; aspect-ratio: 16 / 10; }
.svc-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; filter: saturate(.92); }
.svc-card:hover .svc-img img { transform: scale(1.06); }
.svc-body { padding: 22px 22px 26px; display: flex; flex-direction: column; flex: 1; }
.svc-en { font-size: 11px; letter-spacing: 3px; color: var(--red); font-weight: 600; }
.svc-body h3 { font-size: 20px; font-weight: 700; letter-spacing: 2px; margin: 6px 0 10px; }
.svc-body p { font-size: 13.5px; color: var(--muted); flex: 1; }
.svc-more { margin-top: 14px; font-size: 13px; color: var(--text); letter-spacing: 1px; transition: color .2s; }
.svc-card:hover .svc-more { color: var(--red); }

/* ---------- 流程 ---------- */
.flow-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 22px; }
.flow-card { border-top: 3px solid var(--red); background: var(--panel); border: 1px solid var(--line); border-top: 3px solid var(--red); padding: 32px 28px; }
.flow-no { font-size: 40px; font-weight: 800; color: transparent; -webkit-text-stroke: 1.5px var(--red); }
.flow-card h3 { font-size: 19px; letter-spacing: 2px; margin: 12px 0 10px; }
.flow-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 客户 ---------- */
.client-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.client-card { background: var(--panel); border: 1px solid var(--line); padding: 34px 30px; transition: border-color .25s; }
.client-card:hover { border-color: var(--red); }
.client-en { font-size: 11px; letter-spacing: 3px; color: var(--red); font-weight: 600; }
.client-card h3 { font-size: 21px; letter-spacing: 2px; margin: 8px 0 12px; }
.client-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 图库 ---------- */
.gallery { display: grid; gap: 14px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.g-item { position: relative; overflow: hidden; background: var(--panel); }
.g-item img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3; transition: transform .45s ease, filter .45s; filter: saturate(.9); }
.g-item:hover img { transform: scale(1.05); filter: saturate(1.05); }
.g-item figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 34px 16px 12px;
  background: linear-gradient(180deg, transparent, rgba(10,10,12,.85));
  font-size: 13px;
  letter-spacing: 2px;
  opacity: 0;
  transform: translateY(8px);
  transition: all .3s;
}
.g-item:hover figcaption { opacity: 1; transform: translateY(0); }
.g-item figcaption span::before {
  content: "";
  display: inline-block;
  width: 14px; height: 2px;
  background: var(--red);
  margin-right: 8px;
  vertical-align: middle;
}

/* ---------- CTA ---------- */
.cta-band { background: var(--red); }
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding-top: 56px;
  padding-bottom: 56px;
  flex-wrap: wrap;
}
.cta-inner h2 { font-size: clamp(20px, 2.6vw, 30px); font-weight: 800; letter-spacing: 2px; line-height: 1.5; color: #fff; }
.cta-inner p { color: rgba(255,255,255,.85); margin-top: 8px; letter-spacing: 1px; }

/* ---------- 关于页 ---------- */
.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 56px; align-items: center; }
.about-text p { color: #cfcfd6; margin-bottom: 18px; font-size: 15.5px; }
.about-text strong { color: var(--text); }
.about-tags { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 10px; }
.about-tags span { border: 1px solid var(--line); padding: 6px 18px; font-size: 13px; color: var(--muted); letter-spacing: 1px; }
.about-visual { position: relative; }
.about-visual img { border: 1px solid var(--line); width: 100%; aspect-ratio: 1; object-fit: cover; }
.about-badge {
  position: absolute;
  left: -22px; bottom: -22px;
  background: var(--red);
  padding: 22px 26px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.about-badge strong { font-size: 44px; font-weight: 800; color: #fff; line-height: 1; }
.about-badge span { font-size: 13px; color: rgba(255,255,255,.9); line-height: 1.5; }
.map-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.map-card { background: var(--panel); border: 1px solid var(--line); border-left: 3px solid var(--red); padding: 26px 26px; }
.map-card h3 { font-size: 18px; letter-spacing: 2px; margin-bottom: 8px; }
.map-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- 服务详情页 ---------- */
.service-intro { display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; align-items: start; }
.service-desc p { color: #cfcfd6; margin-bottom: 16px; font-size: 15.5px; }
.service-side { background: var(--panel); border: 1px solid var(--line); border-top: 3px solid var(--red); padding: 30px 28px; }
.service-side h3 { font-size: 17px; letter-spacing: 2px; margin-bottom: 18px; }
.chip-group { display: flex; flex-wrap: wrap; gap: 10px; }
.chip-group span { border: 1px solid var(--line); padding: 7px 16px; font-size: 13px; color: #cfcfd6; transition: all .2s; }
.chip-group span:hover { border-color: var(--red); color: var(--red); }
.other-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; }
.other-item {
  border: 1px solid var(--line);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color .2s;
}
.other-item:hover { border-color: var(--red); }
.other-item span { font-size: 15px; font-weight: 600; letter-spacing: 1px; }
.other-item em { font-style: normal; font-size: 10.5px; letter-spacing: 2px; color: var(--muted); }

/* ---------- 案例筛选 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.filter-btn {
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 9px 22px;
  font-size: 13.5px;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all .2s;
  font-family: inherit;
}
.filter-btn:hover { color: var(--text); border-color: #4a4a52; }
.filter-btn.active { background: var(--red); border-color: var(--red); color: #fff; }

/* ---------- 新闻 ---------- */
.news-list { max-width: 900px; }
.news-item {
  display: flex;
  gap: 30px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}
.news-date {
  flex-shrink: 0;
  width: 86px;
  text-align: center;
  border-right: 2px solid var(--red);
  padding-right: 20px;
}
.news-date strong { display: block; font-size: 34px; font-weight: 800; line-height: 1.1; }
.news-date span { font-size: 13px; color: var(--muted); letter-spacing: 2px; }
.news-tag { display: inline-block; font-size: 11.5px; color: var(--red); border: 1px solid var(--red); padding: 2px 12px; letter-spacing: 2px; margin-bottom: 10px; }
.news-body h3 { font-size: 20px; letter-spacing: 1px; margin-bottom: 8px; transition: color .2s; }
.news-body h3:hover { color: var(--red); }
.news-body p { font-size: 14px; color: var(--muted); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 56px; align-items: start; }
.contact-item { display: flex; gap: 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.ci-label { flex-shrink: 0; width: 48px; font-size: 13px; color: var(--red); letter-spacing: 2px; font-weight: 600; padding-top: 2px; }
.contact-item a, .contact-item p { font-size: 16px; color: #cfcfd6; }
.contact-item a:hover { color: var(--red); }
.contact-item .wechat-id { color: #fff; font-weight: 600; letter-spacing: .5px; }
.contact-qr { display: flex; gap: 20px; align-items: center; margin-top: 8px; padding: 20px; background: var(--panel); border: 1px solid var(--line); border-left: 3px solid var(--red); }
.contact-qr img { width: 124px; height: 124px; object-fit: contain; background: #fff; padding: 6px; border: 1px solid var(--line); cursor: zoom-in; transition: transform .25s ease, box-shadow .25s ease; }
.contact-qr:hover img { transform: scale(1.04); box-shadow: 0 10px 28px rgba(0,0,0,.5); border-color: var(--red); }
.contact-qr .qr-zoom-hint { display: block; width: fit-content; margin-top: 10px; font-size: 12px; color: var(--muted); letter-spacing: 1px; border: 1px solid var(--line); padding: 4px 12px; border-radius: 2px; transition: color .2s, border-color .2s; }
.contact-qr:hover .qr-zoom-hint { color: var(--red); border-color: var(--red); }
.qr-lightbox { position: fixed; inset: 0; z-index: 999; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 20px; background: rgba(5,5,8,.9); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); opacity: 0; visibility: hidden; transition: opacity .25s ease, visibility .25s ease; cursor: zoom-out; }
.qr-lightbox.show { opacity: 1; visibility: visible; }
.qr-lightbox-card { background: #fff; padding: 20px; box-shadow: 0 24px 80px rgba(0,0,0,.6); transform: scale(.85); transition: transform .25s ease; }
.qr-lightbox.show .qr-lightbox-card { transform: scale(1); }
.qr-lightbox-card img { display: block; width: min(72vw, 400px); height: auto; }
.qr-lightbox-card p { margin-top: 14px; text-align: center; font-size: 14px; color: #111; font-weight: 600; letter-spacing: 1px; }
.qr-lightbox-tip { color: rgba(255,255,255,.72); font-size: 13px; letter-spacing: 3px; }
.contact-qr .qr-text { font-size: 14px; color: #cfcfd6; line-height: 1.7; }
.contact-qr .qr-text strong { color: #fff; font-size: 15px; letter-spacing: .5px; }
.contact-qr .qr-text small { display: block; color: var(--muted); font-size: 12px; margin-top: 4px; letter-spacing: 1px; }
.contact-note { margin-top: 30px; background: var(--panel); border: 1px solid var(--line); border-left: 3px solid var(--red); padding: 24px 26px; }
.contact-note h4 { font-size: 16px; letter-spacing: 2px; margin-bottom: 8px; }
.contact-note p { font-size: 13.5px; color: var(--muted); }
.contact-form { background: var(--panel); border: 1px solid var(--line); border-top: 3px solid var(--red); padding: 36px 34px; }
.contact-form h3 { font-size: 21px; letter-spacing: 2px; }
.form-tip { font-size: 13px; color: var(--muted); margin: 8px 0 24px; }
.contact-form input, .contact-form select, .contact-form textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 13px 16px;
  font-size: 14px;
  font-family: inherit;
  margin-bottom: 16px;
  transition: border-color .2s;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: none; border-color: var(--red); }
.contact-form select { appearance: none; }
.form-row { display: flex; gap: 16px; }
.form-row input { flex: 1; }
.contact-form textarea { resize: vertical; }
.form-status { margin-top: 14px; font-size: 13.5px; color: var(--red); letter-spacing: 1px; display: none; }
.form-status.show { display: block; }

/* ---------- 页脚 ---------- */
.site-footer { background: #060608; border-top: 3px solid var(--red); }
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 64px 24px 48px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
}
.footer-brand p { font-size: 13.5px; color: var(--muted); margin-top: 18px; letter-spacing: 1px; }
.footer-site { color: var(--red) !important; letter-spacing: 2px; }
.footer-col h4 { font-size: 15px; letter-spacing: 3px; margin-bottom: 20px; color: var(--text); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a, .footer-col ul li { font-size: 13.5px; color: var(--muted); transition: color .2s; }
.footer-col ul a:hover { color: var(--red); }
.footer-contact li { line-height: 1.6; }
.footer-bottom { border-top: 1px solid var(--line); }
.footer-bottom p {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 24px;
  font-size: 12.5px;
  color: #6a6a72;
  letter-spacing: 1px;
  text-align: center;
}
.footer-bottom a { color: #6a6a72; transition: color .2s; }
.footer-bottom a:hover { color: var(--red); }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px; bottom: 30px;
  width: 46px; height: 46px;
  background: var(--red);
  color: #fff;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
  z-index: 90;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--red-deep); }

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   响应式适配
   ============================================================ */
@media (max-width: 1400px) {
  .site-nav > ul > li > a,
  .drop-link { padding: 8px 6px; font-size: 12.5px; }
}
@media (max-width: 1200px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg2);
    border-bottom: 1px solid var(--line);
    padding: 12px 24px 20px;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease;
  }
  .site-nav.open { max-height: calc(100vh - 68px); overflow-y: auto; }
  .site-nav > ul { flex-direction: column; align-items: stretch; width: 100%; gap: 0; }
  .site-nav > ul > li > a,
  .drop-link { padding: 13px 8px; border-bottom: none; border-left: 2px solid transparent; font-size: 15px; text-align: left; width: 100%; color: #ffffff; }
  .site-nav > ul > li > a.active { border-left-color: var(--red); }
  /* 移动端：下拉改为手风琴展开 */
  .drop-menu {
    position: static;
    transform: none;
    min-width: 0;
    width: 100%;
    grid-template-columns: 1fr;
    background: transparent;
    border: none;
    border-left: 2px solid var(--line);
    margin: 4px 0 8px 10px;
    padding: 2px 0 2px 14px;
    max-height: 0;
    overflow: hidden;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    transition: max-height .35s ease;
  }
  .nav-drop.open .drop-menu { max-height: 620px; opacity: 1; visibility: visible; transform: none; }
  .drop-menu li a { padding: 11px 8px; font-size: 14px; }
  .grid-4 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 960px) {
  .section { padding: 64px 0; }
  .about-grid, .service-intro, .contact-grid { grid-template-columns: 1fr; gap: 44px; }
  .about-visual { max-width: 480px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .hero-strip strong { font-size: 20px; }
  .hero-strip span { font-size: 11px; letter-spacing: 2px; }
  .contact-qr { flex-direction: column; align-items: flex-start; }
  .contact-qr img { width: 140px; height: 140px; }
}
@media (max-width: 600px) {
  .container { padding: 0 18px; }
  .hero { min-height: 86vh; }
  .hero-content { padding: 110px 18px 120px; }
  .hero-strip { flex-wrap: wrap; }
  .hero-strip div { flex: 1 1 50%; border-bottom: 1px solid rgba(255,255,255,.1); padding: 14px 6px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .svc-grid { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; gap: 0; }
  .news-item { flex-direction: column; gap: 14px; }
  .news-date { width: auto; display: flex; align-items: baseline; gap: 10px; border-right: none; padding-right: 0; }
  .about-badge { left: 12px; bottom: -20px; padding: 16px 20px; }
  .about-badge strong { font-size: 32px; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; padding: 48px 18px 36px; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .g-item figcaption { opacity: 1; transform: none; }
  .back-top { right: 16px; bottom: 20px; }
}