/* ============================================================
   上海荣骏彩钢板结构有限公司 - 企业官网
   暗黑商务设计系统 v1.0
   ============================================================ */

:root {
  /* 色彩体系：浅灰商务 + 钢蓝主色 + 深金点缀 */
  --bg-0: #f4f5f7;
  --bg-1: #eceef1;
  --bg-2: #ffffff;
  --bg-3: #f6f7f9;
  --bg-4: #dfe3e8;
  --line: rgba(15, 30, 50, 0.08);
  --line-strong: rgba(15, 30, 50, 0.15);
  --gold: #a07e42;
  --gold-bright: #c2a466;
  --gold-dim: #8a6d38;
  --gold-deep: #6e5629;
  --blue: #1f4e79;
  --blue-bright: #2f6aa6;
  --red: #c8102e;
  --red-bright: #e0314a;
  --red-dim: #a00d24;
  --text-1: #1c2430;
  --text-2: #55616e;
  --text-3: #7c8794;
  --text-4: #a4adb8;
  --ok: #2e8b57;

  /* 尺寸 */
  --container: 1240px;
  --radius: 4px;
  --radius-lg: 8px;
  --header-h: 76px;
  --topbar-h: 40px;

  /* 字体 */
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "微软雅黑", sans-serif;
  --font-en: "Barlow", "Noto Sans SC", "Microsoft YaHei", sans-serif;

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.4s;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-0);
  color: var(--text-1);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--dur) var(--ease); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
::selection { background: rgba(200, 16, 46, 0.25); color: #fff; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--blue); }

.container { max-width: var(--container); margin: 0 auto; padding: 0 32px; }

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--bg-0);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-2);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--topbar-h);
  gap: 24px;
}
.topbar-links { display: flex; align-items: center; gap: 28px; }
.topbar-links a { display: inline-flex; align-items: center; gap: 8px; color: var(--text-2); }
.topbar-links a:hover { color: var(--blue); }
.topbar-links svg { width: 14px; height: 14px; stroke: var(--blue); flex: none; }
.topbar-slogan { color: var(--text-3); letter-spacing: 0.08em; font-size: 12px; }
.topbar-slogan b { color: var(--blue); font-weight: 500; }

/* ---------- 主导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.site-header.scrolled { border-bottom-color: var(--line); background: rgba(255, 255, 255, 0.96); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between; height: 100%;
}
.brand { display: flex; align-items: center; gap: 14px; flex: none; }
.brand-img { height: 48px !important; width: auto !important; max-width: 160px; display: block; border-radius: 6px; object-fit: contain; }
.brand-mark { width: 46px; height: 46px; flex: none; display: grid; place-items: center; }
.brand-mark svg { width: 100%; height: 100%; }
.brand-name { line-height: 1.25; }
.brand-name .cn { font-size: 19px; font-weight: 700; letter-spacing: 0.06em; color: var(--text-1); }
.brand-name .cn b { color: var(--blue); font-weight: 700; }
.brand-name .en { font-size: 10px; letter-spacing: 0.34em; color: var(--text-3); text-transform: uppercase; }

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav > li { position: relative; }
.main-nav > li > a {
  display: flex; align-items: center; gap: 5px;
  padding: 10px 18px;
  font-size: 15px; color: var(--text-2);
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  position: relative;
}
.main-nav > li > a::after {
  content: ""; position: absolute; left: 18px; right: 18px; bottom: 4px;
  height: 1px; background: var(--blue);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.main-nav > li > a:hover, .main-nav > li > a.active { color: var(--text-1); }
.main-nav > li > a:hover::after, .main-nav > li > a.active::after { transform: scaleX(1); }
.main-nav .has-drop > a svg { width: 12px; height: 12px; transition: transform var(--dur) var(--ease); }

.dropdown {
  position: absolute; top: calc(100% + 10px); left: 0;
  min-width: 260px; padding: 8px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.55);
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: all var(--dur) var(--ease);
  z-index: 50;
}
.main-nav .has-drop:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 9px 14px; border-radius: var(--radius);
  font-size: 14px; color: var(--text-2);
}
.dropdown a span.num { font-size: 11px; color: var(--blue); font-family: var(--font-en); letter-spacing: 0.1em; }
.dropdown a:hover { background: var(--bg-3); color: var(--blue); }
.dropdown a:hover span.num { color: var(--blue); }

.header-cta { display: flex; align-items: center; gap: 16px; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 12px 28px;
  font-size: 14.5px; font-weight: 500; letter-spacing: 0.06em;
  border-radius: var(--radius);
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
}
.btn svg { width: 15px; height: 15px; }
.btn-gold {
  background: linear-gradient(135deg, var(--red-bright), var(--red));
  color: #ffffff;
  box-shadow: 0 6px 22px rgba(200, 16, 46, 0.22);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(200, 16, 46, 0.32); color: #ffffff; }
.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--text-1);
  background: rgba(255, 255, 255, 0.02);
}
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.btn-sm { padding: 9px 20px; font-size: 13px; }
.btn-lg { padding: 15px 38px; font-size: 15.5px; }

/* 汉堡菜单（移动端） */
.burger {
  display: none; flex-direction: column; gap: 5px;
  width: 42px; height: 42px; align-items: center; justify-content: center;
}
.burger span { display: block; width: 22px; height: 2px; background: var(--text-1); transition: all var(--dur) var(--ease); }
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端抽屉 */
.mobile-nav { display: none; }
.mobile-drawer {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(15, 30, 50, 0.35);
  backdrop-filter: blur(4px);
  opacity: 0; visibility: hidden; transition: all var(--dur) var(--ease);
}
.mobile-drawer.open { opacity: 1; visibility: visible; }
.mobile-drawer-panel {
  position: absolute; top: 0; right: 0; bottom: 0; width: min(340px, 86vw);
  background: var(--bg-2);
  border-left: 1px solid var(--line);
  padding: 32px 26px;
  transform: translateX(100%);
  transition: transform var(--dur) var(--ease);
  overflow-y: auto;
}
.mobile-drawer.open .mobile-drawer-panel { transform: translateX(0); }
.mobile-drawer-panel a {
  display: block; padding: 13px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--text-2); font-size: 15.5px;
}
.mobile-drawer-panel a:hover, .mobile-drawer-panel a.active { color: var(--blue); }
.mobile-drawer-panel .m-nav-series { display: none; padding-left: 16px; }
.mobile-drawer-panel a.m-open + .m-nav-series { display: block; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h) - var(--topbar-h));
  display: flex; align-items: center;
  overflow: hidden;
  isolation: isolate;
}
.hero-bg { position: absolute; inset: 0; z-index: -2; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(244, 245, 247, 0.95) 0%, rgba(244, 245, 247, 0.82) 46%, rgba(244, 245, 247, 0.3) 100%),
    linear-gradient(180deg, rgba(244, 245, 247, 0.35) 0%, rgba(244, 245, 247, 0.08) 55%, var(--bg-0) 100%);
}
.hero-grid-lines {
  position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(31, 78, 121, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 78, 121, 0.06) 1px, transparent 1px);
  background-size: 90px 90px;
  mask-image: radial-gradient(ellipse 80% 70% at 30% 40%, rgba(0,0,0,0.9), transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 30% 40%, rgba(0,0,0,0.9), transparent 70%);
}
.hero-inner { padding-top: 120px; padding-bottom: 140px; }

.hero-kicker {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 13px; letter-spacing: 0.32em; color: var(--blue);
  text-transform: uppercase; margin-bottom: 26px;
}
.hero-kicker::before { content: ""; width: 44px; height: 1px; background: var(--blue); }

.hero h1 {
  font-size: clamp(36px, 5.2vw, 60px);
  font-weight: 700; line-height: 1.22;
  letter-spacing: 0.02em;
  margin-bottom: 24px;
  color: var(--blue);
}
.hero h1 .gold { color: var(--red); }
.hero-sub {
  font-size: 17px; color: var(--text-2); line-height: 1.9;
  max-width: 620px; margin-bottom: 42px;
}
.hero-actions { display: flex; gap: 18px; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-size: 13px; color: var(--blue); }

.hero-scroll {
  position: absolute; left: 50%; bottom: 34px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-3); font-size: 12px; letter-spacing: 0.3em;
}
.hero-scroll .mouse {
  width: 22px; height: 36px; border: 1px solid var(--line-strong); border-radius: 12px;
  position: relative;
}
.hero-scroll .mouse::after {
  content: ""; position: absolute; top: 7px; left: 50%; transform: translateX(-50%);
  width: 3px; height: 7px; border-radius: 2px; background: var(--red);
  animation: scrollDot 1.8s var(--ease) infinite;
}
@keyframes scrollDot {
  0% { opacity: 1; top: 7px; }
  70% { opacity: 0; top: 20px; }
  100% { opacity: 0; top: 20px; }
}

/* Hero 内页（子页面顶部横幅） */
.page-hero {
  position: relative; padding: 92px 0 78px;
  background: linear-gradient(180deg, #e7ebef, var(--bg-0));
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.page-hero .ph-bg {
  position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(31, 78, 121, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 78, 121, 0.05) 1px, transparent 1px);
  background-size: 80px 80px;
}
.page-hero .crumbs {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: var(--text-3); margin-bottom: 22px;
}
.page-hero .crumbs a:hover { color: var(--blue); }
.page-hero .crumbs svg { width: 12px; height: 12px; stroke: var(--text-3); }
.page-hero h1 {
  font-size: clamp(30px, 4vw, 44px); font-weight: 700; letter-spacing: 0.03em;
  display: flex; align-items: baseline; gap: 18px;
  color: var(--blue);
}
.page-hero h1 .en { font-size: 15px; color: var(--blue); letter-spacing: 0.3em; text-transform: uppercase; font-weight: 400; }
.page-hero .lead { margin-top: 16px; color: var(--text-2); max-width: 760px; font-size: 15.5px; }

/* ---------- 区块通用 ---------- */
.section { padding: 104px 0; position: relative; }
.section.alt { background: var(--bg-1); }
.section.slim { padding: 72px 0; }
.section-head { margin-bottom: 56px; max-width: 720px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-kicker {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 12.5px; letter-spacing: 0.3em; color: var(--blue);
  text-transform: uppercase; margin-bottom: 18px;
}
.section-kicker::before { content: ""; width: 34px; height: 1px; background: var(--blue); }
.section-head.center .section-kicker::after { content: ""; width: 34px; height: 1px; background: var(--blue); }
.section-title { font-size: clamp(26px, 3.2vw, 38px); font-weight: 700; letter-spacing: 0.02em; line-height: 1.35; color: var(--blue); }
.section-title .gold { color: var(--red); }
.section-desc { margin-top: 18px; color: var(--text-2); font-size: 15.5px; line-height: 1.9; }
.section-more { margin-top: 40px; }

/* 滚动显现 */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }
.reveal.d4 { transition-delay: 0.32s; }

/* ---------- 首页：数据带 ---------- */
.stats-band {
  border-top: 1px solid var(--line);
  background: var(--bg-1);
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
}
.stat-item {
  padding: 40px 28px; text-align: center;
  border-right: 1px solid var(--line);
  position: relative;
}
.stat-item:last-child { border-right: none; }
.stat-item .num { font-size: 44px; font-weight: 700; color: var(--red); font-family: var(--font-en); line-height: 1.1; }
.stat-item .num small { font-size: 22px; color: var(--red-dim); }
.stat-item .lbl { margin-top: 10px; color: var(--text-2); font-size: 14px; letter-spacing: 0.14em; }
.stat-item::before {
  content: ""; position: absolute; left: 50%; top: 0; transform: translateX(-50%);
  width: 0; height: 2px; background: var(--blue); transition: width var(--dur) var(--ease);
}
.stat-item:hover::before { width: 60%; }

/* ---------- 产品系列卡片 ---------- */
.series-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.series-card {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 34px 22px 28px;
  transition: all var(--dur) var(--ease);
  overflow: hidden;
  display: block;
}
.series-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--red-bright), var(--red));
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.series-card:hover { transform: translateY(-6px); border-color: rgba(200, 16, 46, 0.4); box-shadow: 0 20px 44px rgba(0, 0, 0, 0.5); }
.series-card:hover::before { transform: scaleX(1); }
.series-card .sc-num {
  font-family: var(--font-en); font-size: 13px; color: var(--blue);
  letter-spacing: 0.2em;
}
.series-card .sc-icon {
  width: 52px; height: 52px; margin: 18px 0 20px;
  display: grid; place-items: center;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  color: var(--blue);
  background: linear-gradient(135deg, rgba(31, 78, 121, 0.08), transparent);
  transition: all var(--dur) var(--ease);
}
.series-card:hover .sc-icon { background: var(--red); color: #ffffff; box-shadow: 0 8px 22px rgba(200, 16, 46, 0.22); }
.series-card .sc-icon svg { width: 26px; height: 26px; }
.series-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; letter-spacing: 0.02em; }
.series-card p { font-size: 13px; color: var(--text-3); line-height: 1.7; margin-bottom: 18px; }
.series-card .sc-link {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; color: var(--text-2); letter-spacing: 0.06em;
}
.series-card .sc-link svg { width: 13px; height: 13px; transition: transform var(--dur) var(--ease); }
.series-card:hover .sc-link { color: var(--blue); }
.series-card:hover .sc-link svg { transform: translateX(5px); }
.series-card.placeholder { border-style: dashed; border-color: var(--line-strong); background: transparent; }
.series-card.placeholder .sc-icon { color: var(--text-4); border-color: var(--line); }
.series-card.placeholder h3 { color: var(--text-2); }
.series-card.placeholder .sc-num { color: var(--text-4); }

/* ---------- 关于（首页） ---------- */
.about-split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 72px; align-items: center; }
.about-media { position: relative; }
.about-media .main-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  position: relative;
  aspect-ratio: 4 / 3;
}
.about-media .main-img img { width: 100%; height: 100%; object-fit: cover; }
.about-media .main-img::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10, 12, 16, 0.6));
}
.about-media .frame {
  position: absolute; right: -22px; bottom: -22px;
  width: 55%; padding: 22px 24px;
  background: var(--bg-3);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
}
.about-media .frame .t { font-size: 13px; color: var(--text-3); letter-spacing: 0.14em; }
.about-media .frame .d { font-size: 15px; color: var(--text-1); margin-top: 4px; font-weight: 500; }
.about-copy .lead { font-size: 17px; color: var(--text-1); line-height: 1.9; margin-bottom: 18px; }
.about-copy .lead b { color: var(--blue); font-weight: 600; }
.about-copy .body { color: var(--text-2); font-size: 15px; line-height: 1.95; margin-bottom: 28px; }
.about-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 34px; }
.about-tags span {
  padding: 7px 16px; font-size: 13px;
  border: 1px solid var(--line-strong); border-radius: 100px;
  color: var(--text-2); letter-spacing: 0.05em;
}
.about-tags span b { color: var(--blue); font-weight: 500; }

/* ---------- 优势卡片 ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.adv-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 40px 34px;
  transition: all var(--dur) var(--ease);
  position: relative;
  overflow: hidden;
}
.adv-card::after {
  content: ""; position: absolute; right: -40px; bottom: -40px;
  width: 150px; height: 150px; border-radius: 50%;
  background: radial-gradient(circle, rgba(31, 78, 121, 0.08), transparent 70%);
  transition: transform var(--dur) var(--ease);
}
.adv-card:hover { border-color: rgba(200, 16, 46, 0.4); transform: translateY(-4px); }
.adv-card:hover::after { transform: scale(1.5); }
.adv-card .ac-icon {
  width: 58px; height: 58px; margin-bottom: 26px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(31, 78, 121, 0.1), rgba(31, 78, 121, 0.03));
  border: 1px solid rgba(31, 78, 121, 0.3);
  border-radius: var(--radius);
  color: var(--blue);
}
.adv-card .ac-icon svg { width: 28px; height: 28px; }
.adv-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 12px; }
.adv-card p { font-size: 14px; color: var(--text-3); line-height: 1.85; }
.adv-card .ac-num {
  position: absolute; top: 26px; right: 30px;
  font-family: var(--font-en); font-size: 40px; font-weight: 700;
  color: rgba(31, 78, 121, 0.06);
}

/* ---------- 产品流程 / 服务流程 ---------- */
.flow-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: flow; }
.flow-step {
  position: relative; padding: 34px 24px;
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius-lg);
}
.flow-step .fs-num {
  font-family: var(--font-en); font-size: 30px; font-weight: 700; color: var(--red);
  margin-bottom: 14px; display: flex; align-items: center; gap: 14px;
}
.flow-step .fs-num::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.flow-step h3 { font-size: 16px; font-weight: 600; margin-bottom: 10px; }
.flow-step p { font-size: 13.5px; color: var(--text-3); line-height: 1.8; }
.flow-step::before {
  content: ""; position: absolute; left: 24px; right: 24px; top: 0; height: 2px;
  background: linear-gradient(90deg, var(--red), transparent);
  transform: scaleX(0); transform-origin: left; transition: transform var(--dur) var(--ease);
}
.flow-step:hover::before { transform: scaleX(1); }

/* ---------- 新闻卡片 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card {
  display: block; background: var(--bg-2);
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--dur) var(--ease);
}
.news-card:hover { transform: translateY(-6px); border-color: rgba(200, 16, 46, 0.4); box-shadow: 0 20px 44px rgba(0, 0, 0, 0.5); }
.news-card .nc-thumb { aspect-ratio: 16 / 9; position: relative; overflow: hidden; background: linear-gradient(135deg, var(--blue) 0%, var(--blue-bright) 100%); }
.news-card .nc-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.7s var(--ease); }
.news-card .nc-thumb img.nr-logo { object-fit: contain; background: #ffffff; padding: 8%; box-sizing: border-box; }
.news-card:hover .nc-thumb img { transform: scale(1.06); }
.news-card .nc-thumb .ph {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: rgba(255,255,255,0.9);
}
.news-card .nc-thumb .ph svg { width: 40px; height: 40px; stroke: currentColor; }
.news-card .nc-date {
  position: absolute; left: 16px; top: 16px;
  background: rgba(255, 255, 255, 0.92); backdrop-filter: blur(6px);
  border: 1px solid rgba(200, 16, 46, 0.5);
  color: var(--red);
  padding: 6px 12px; font-size: 12px; border-radius: 3px;
  font-family: var(--font-en); letter-spacing: 0.08em;
}
.news-card .nc-body { padding: 24px 24px 26px; }
.news-card .nc-cat { font-size: 12px; color: var(--blue); letter-spacing: 0.2em; margin-bottom: 10px; }
.news-card h3 { font-size: 16.5px; font-weight: 600; line-height: 1.55; margin-bottom: 12px; }
.news-card:hover h3 { color: var(--blue); }
.news-card p { font-size: 13.5px; color: var(--text-3); line-height: 1.8; }
.news-card.placeholder .nc-thumb { border-bottom: 1px solid var(--line); }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  position: relative; overflow: hidden;
  background: var(--bg-1);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.cta-band .cta-bg {
  position: absolute; inset: 0; z-index: 0;
}
.cta-band .cta-bg img { width: 100%; height: 100%; object-fit: cover; }
.cta-band .cta-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(244, 245, 247, 0.95) 20%, rgba(244, 245, 247, 0.78));
}
.cta-inner {
  position: relative; z-index: 1;
  display: flex; align-items: center; justify-content: space-between; gap: 40px;
  padding: 88px 0;
  flex-wrap: wrap;
}
.cta-inner h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 700; line-height: 1.4; margin-bottom: 14px; color: var(--blue); }
.cta-inner h2 .gold { color: var(--red); }
.cta-inner p { color: var(--text-2); max-width: 640px; font-size: 15px; }
.cta-inner .cta-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.cta-tel {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--font-en); font-size: 26px; font-weight: 700; color: var(--text-1);
  letter-spacing: 0.03em;
}
.cta-tel svg { width: 30px; height: 30px; stroke: var(--red); }
.cta-tel:hover { color: var(--red); }
.cta-tel small { display: block; font-family: var(--font-cn); font-size: 12px; font-weight: 400; color: var(--text-3); letter-spacing: 0.2em; }

/* ---------- 页脚 ---------- */
.site-footer { background: #e9ecf0; border-top: 1px solid var(--line); }
.footer-main {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.3fr; gap: 56px;
  padding: 76px 0 60px;
}
.footer-brand p { color: var(--text-3); font-size: 14px; line-height: 1.9; margin-top: 20px; max-width: 320px; }
.footer-brand .brand { margin-bottom: 6px; }
.footer-col h4 {
  font-size: 15px; font-weight: 600; letter-spacing: 0.1em;
  margin-bottom: 24px; position: relative; padding-bottom: 14px;
  color: var(--text-1);
}
.footer-col h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 28px; height: 2px; background: var(--blue); }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul a { color: var(--text-3); font-size: 14px; }
.footer-col ul a:hover { color: var(--blue); padding-left: 4px; }
.footer-contact li { display: flex; gap: 12px; color: var(--text-3); font-size: 14px; margin-bottom: 16px; align-items: flex-start; }
.footer-contact svg { width: 16px; height: 16px; flex: none; stroke: var(--blue); margin-top: 4px; }
.footer-contact a:hover { color: var(--blue); }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 22px 0;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  color: var(--text-3); font-size: 13px; flex-wrap: wrap;
}
.footer-bottom a { color: var(--text-3); }
.footer-bottom a:hover { color: var(--blue); }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 30px; bottom: 30px; z-index: 80;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  background: var(--bg-3); border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--text-2);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all var(--dur) var(--ease);
}
.back-top.show { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { background: var(--red); color: #ffffff; border-color: var(--red); }
.back-top svg { width: 18px; height: 18px; }

/* ---------- 产品详情页 ---------- */
.crumb-line { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-3); margin-bottom: 34px; flex-wrap: wrap; }
.crumb-line a:hover { color: var(--blue); }
.crumb-line svg { width: 11px; height: 11px; stroke: var(--text-3); }
.crumb-line .now { color: var(--red); }

.product-head { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; align-items: start; margin-bottom: 72px; }
.product-head .ph-media {
  border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden;
  aspect-ratio: 4 / 3; background: var(--bg-2); position: relative;
}
.product-head .ph-media .ph-empty {
  position: absolute; inset: 0; display: grid; place-items: center; flex-direction: column;
  color: var(--text-4); text-align: center; gap: 14px;
}
.product-head .ph-media .ph-empty svg { width: 56px; height: 56px; }
.product-head .ph-media .ph-empty span { font-size: 13px; letter-spacing: 0.2em; }
.product-head .ph-media .ph-img { width: 100%; height: 100%; object-fit: cover; display: block; }
.product-head h1 { font-size: 30px; font-weight: 700; margin-bottom: 14px; color: var(--blue); }
.product-head .en-name { font-family: var(--font-en); color: var(--blue); letter-spacing: 0.22em; font-size: 13px; text-transform: uppercase; margin-bottom: 22px; }
.product-head .desc { color: var(--text-2); font-size: 15px; line-height: 1.95; margin-bottom: 30px; }
.spec-list { border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 34px; }
.spec-list .row { display: grid; grid-template-columns: 130px 1fr; font-size: 14px; }
.spec-list .row:nth-child(odd) { background: var(--bg-2); }
.spec-list .row dt { padding: 13px 20px; color: var(--text-3); border-right: 1px solid var(--line); letter-spacing: 0.06em; }
.spec-list .row dd { padding: 13px 20px; color: var(--text-1); }
.spec-list .row dd .tbd { color: var(--text-4); }

.contact-mini { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.contact-mini .btn { min-width: 150px; }

.product-spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.product-spec-table th {
  text-align: left; padding: 15px 18px;
  background: var(--bg-3); color: var(--blue);
  font-weight: 500; letter-spacing: 0.08em; font-size: 13px;
  border-bottom: 1px solid var(--line-strong);
}
.product-spec-table td { padding: 14px 18px; border-bottom: 1px solid var(--line); color: var(--text-2); }
.product-spec-table tbody tr { transition: background var(--dur) var(--ease); }
.product-spec-table tbody tr:hover { background: var(--bg-2); }
.product-spec-table td .tbd { color: var(--text-4); }
.product-spec-table .t-colors { display: flex; gap: 6px; flex-wrap: wrap; }
.color-chip {
  width: 22px; height: 22px; border-radius: 50%;
  border: 1px solid var(--line-strong); display: inline-block;
}
.product-spec-table tr:last-child td { border-bottom: none; }

.empty-note {
  padding: 60px 32px; text-align: center;
  border: 1px dashed var(--line-strong); border-radius: var(--radius-lg);
  color: var(--text-3); font-size: 14px; line-height: 2;
}
.empty-note svg { width: 40px; height: 40px; margin: 0 auto 16px; color: var(--text-4); }

/* ---------- 产品中心筛选 ---------- */
.series-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.series-row {
  display: flex; gap: 24px; align-items: center;
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 28px 30px;
  transition: all var(--dur) var(--ease);
}
.series-row:hover { border-color: rgba(200, 16, 46, 0.4); transform: translateY(-4px); box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45); }
.series-row .sr-icon {
  width: 64px; height: 64px; flex: none;
  display: grid; place-items: center;
  border: 1px solid rgba(31, 78, 121, 0.3);
  border-radius: var(--radius);
  color: var(--blue);
  background: linear-gradient(135deg, rgba(31, 78, 121, 0.08), transparent);
}
.series-row .sr-icon svg { width: 30px; height: 30px; }
.series-row .sr-main { flex: 1; }
.series-row h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.series-row p { font-size: 13.5px; color: var(--text-3); line-height: 1.75; }
.series-row .sr-num { font-family: var(--font-en); font-size: 12px; color: var(--blue); letter-spacing: 0.16em; margin-bottom: 6px; }
.series-row .sr-go { flex: none; }
.series-row .sr-go .btn { padding: 10px 20px; font-size: 13px; }

/* ---------- 关于页 ---------- */
.milestone { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.milestone-item { padding: 34px 26px; border-right: 1px solid var(--line); position: relative; }
.milestone-item:last-child { border-right: none; }
.milestone-item .ms-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--blue); margin-bottom: 18px; box-shadow: 0 0 0 5px rgba(31, 78, 121, 0.15); }
.milestone-item h3 { font-size: 18px; font-weight: 600; color: var(--blue); margin-bottom: 8px; }
.milestone-item p { font-size: 13.5px; color: var(--text-3); line-height: 1.8; }
.milestone-item .tbd { color: var(--text-4); }

.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value-card {
  text-align: center; padding: 40px 22px;
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius-lg);
  transition: all var(--dur) var(--ease);
}
.value-card:hover { border-color: rgba(200, 16, 46, 0.4); transform: translateY(-4px); }
.value-card .vc-icon {
  width: 60px; height: 60px; margin: 0 auto 22px;
  display: grid; place-items: center;
  border: 1px solid rgba(31, 78, 121, 0.3); border-radius: 50%;
  color: var(--blue);
}
.value-card .vc-icon svg { width: 26px; height: 26px; }
.value-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; }
.value-card p { font-size: 13px; color: var(--text-3); line-height: 1.8; }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 60px; align-items: start; }
.contact-info-list { display: flex; flex-direction: column; gap: 18px; }
.contact-item {
  display: flex; gap: 20px; align-items: flex-start;
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 26px 28px;
  transition: all var(--dur) var(--ease);
}
.contact-item:hover { border-color: rgba(200, 16, 46, 0.4); }
.contact-item .ci-icon {
  width: 52px; height: 52px; flex: none;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(31, 78, 121, 0.12), transparent);
  border: 1px solid rgba(31, 78, 121, 0.3);
  border-radius: var(--radius);
  color: var(--blue);
}
.contact-item .ci-icon svg { width: 24px; height: 24px; }
.contact-item h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; letter-spacing: 0.04em; }
.contact-item p, .contact-item a { font-size: 14.5px; color: var(--text-2); line-height: 1.8; }
.contact-item a:hover { color: var(--blue); }
.contact-item .tel-lg { font-family: var(--font-en); font-size: 22px; font-weight: 700; color: var(--red); letter-spacing: 0.04em; }

.form-card {
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 40px 38px;
}
.form-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.form-card .form-tip { font-size: 13px; color: var(--text-3); margin-bottom: 30px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-grid .full { grid-column: 1 / -1; }
.form-field label { display: block; font-size: 13px; color: var(--text-2); margin-bottom: 8px; letter-spacing: 0.05em; }
.form-field label b { color: var(--red); }
.form-field input, .form-field select, .form-field textarea {
  width: 100%; padding: 13px 16px;
  background: var(--bg-0); border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--text-1); font-family: inherit; font-size: 14.5px;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(31, 78, 121, 0.15);
}
.form-field textarea { resize: vertical; min-height: 130px; }
.form-field select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23c9a86a' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 16px center; }
.form-field select option { background: var(--bg-3); color: var(--text-1); }
.form-submit { margin-top: 26px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.form-submit .hint { font-size: 12.5px; color: var(--text-4); }
.form-ok { display: none; margin-top: 18px; padding: 14px 18px; background: rgba(111, 191, 143, 0.1); border: 1px solid rgba(111, 191, 143, 0.4); border-radius: var(--radius); color: var(--ok); font-size: 14px; }
.form-ok.show { display: block; }

.map-box {
  margin-top: 72px; border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden;
  position: relative;
}
.map-box iframe { width: 100%; height: 380px; border: 0; display: block; filter: grayscale(0.25); }
.map-box .map-tip {
  position: absolute; left: 24px; bottom: 24px;
  background: rgba(255, 255, 255, 0.94); backdrop-filter: blur(8px);
  border: 1px solid rgba(31, 78, 121, 0.4);
  padding: 14px 20px; border-radius: var(--radius);
  font-size: 13.5px; color: var(--text-2);
  display: flex; align-items: center; gap: 10px;
}
.map-box .map-tip svg { width: 16px; height: 16px; stroke: var(--blue); }

/* ---------- 新闻列表页 ---------- */
.news-list { display: flex; flex-direction: column; gap: 20px; }
.news-row {
  display: grid; grid-template-columns: 220px 1fr; gap: 30px; align-items: center;
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 22px;
  transition: all var(--dur) var(--ease);
}
.news-row:hover { border-color: rgba(200, 16, 46, 0.4); transform: translateY(-3px); }
.news-row .nr-thumb { aspect-ratio: 16 / 9; border-radius: var(--radius); overflow: hidden; background: linear-gradient(135deg, var(--blue) 0%, var(--blue-bright) 100%); position: relative; flex: none; }
.news-row .nr-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.news-row .nr-thumb img.nr-logo { object-fit: contain; background: #ffffff; padding: 6%; box-sizing: border-box; }
.news-row .nr-thumb .ph { position: absolute; inset: 0; display: grid; place-items: center; color: rgba(255,255,255,0.9); }
.news-row .nr-thumb .ph svg { width: 34px; height: 34px; stroke: currentColor; }
.news-row .nr-date { font-family: var(--font-en); color: var(--red); font-size: 13px; letter-spacing: 0.12em; margin-bottom: 10px; }
.news-row h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; transition: color var(--dur) var(--ease); }
.news-row:hover h3 { color: var(--blue); }
.news-row p { font-size: 14px; color: var(--text-3); line-height: 1.85; }

/* ---------- 分页 ---------- */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 56px; }
.pagination a, .pagination span {
  min-width: 42px; height: 42px; padding: 0 14px;
  display: grid; place-items: center;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  color: var(--text-2); font-size: 14px;
  transition: all var(--dur) var(--ease);
}
.pagination a:hover { border-color: var(--blue); color: var(--blue); }
.pagination .cur { background: var(--red); color: #ffffff; border-color: var(--red); font-weight: 600; }
.pagination .disabled { opacity: 0.4; }

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .series-grid { grid-template-columns: repeat(4, 1fr); }
  .flow-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 40px; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 960px) {
  .main-nav { display: none; }
  .header-cta .btn { display: none; }
  .burger { display: flex; }
  /* 移动端导航条：直接可见 */
  .mobile-nav {
    display: flex; overflow-x: auto; -webkit-overflow-scrolling: touch;
    background: var(--bg-0); border-bottom: 1px solid var(--line);
    scrollbar-width: none;
  }
  .mobile-nav::-webkit-scrollbar { display: none; }
  .mobile-nav a {
    flex: 1 0 auto; text-align: center; padding: 11px 4px;
    font-size: 14px; color: var(--text-2); letter-spacing: 0.02em;
    border-bottom: 2px solid transparent; white-space: nowrap;
  }
  .mobile-nav a.active { color: var(--red); font-weight: 600; border-bottom-color: var(--red); }
  .topbar-slogan { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2) { border-right: none; }
  .stat-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .series-grid { grid-template-columns: repeat(3, 1fr); }
  .adv-grid { grid-template-columns: 1fr 1fr; }
  .about-split { grid-template-columns: 1fr; gap: 56px; }
  .news-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .product-head { grid-template-columns: 1fr; gap: 40px; }
  .series-list { grid-template-columns: 1fr; }
  .news-row { grid-template-columns: 1fr; }
  .milestone { grid-template-columns: 1fr 1fr; }
  .milestone-item:nth-child(2) { border-right: none; }
  .milestone-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 680px) {
  .container { padding: 0 20px; }
  .section { padding: 72px 0; }
  /* 顶部信息条：电话/邮箱/网址文字必须显示（允许换行） */
  .topbar { font-size: 11px; }
  .topbar-inner { height: auto; min-height: var(--topbar-h); flex-wrap: wrap; justify-content: center; gap: 2px 10px; padding: 6px 0; }
  .topbar-links { flex-wrap: wrap; justify-content: center; gap: 6px 14px; }
  .topbar-links a { white-space: nowrap; font-size: 12px; }
  .topbar-links a span { display: inline; }
  .topbar-links svg { width: 12px; height: 12px; }
  /* 头部：压缩品牌，保证汉堡按钮可见 */
  .brand-img { height: 38px !important; max-width: 120px; }
  .brand-name .cn { font-size: 15px; }
  .brand-name .en { display: none; }
  .header-cta { flex: none; gap: 10px; }
  .burger { flex: none; }
  /* Hero：紧凑不重叠 */
  .hero { min-height: 0; }
  .hero-inner { padding-top: 56px; padding-bottom: 90px; }
  .hero-kicker { font-size: 11px; letter-spacing: 0.18em; margin-bottom: 20px; }
  .hero h1 { font-size: 29px; line-height: 1.3; margin-bottom: 18px; }
  .hero-sub { font-size: 15px; line-height: 1.85; margin-bottom: 30px; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-note { margin-top: 14px; font-size: 12px; }
  .series-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .series-card { padding: 24px 18px 22px; }
  .series-card h3 { font-size: 15px; }
  .adv-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .flow-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .form-grid { grid-template-columns: 1fr; }
  .form-card { padding: 30px 22px; }
  .values-grid { grid-template-columns: 1fr; }
  .milestone { grid-template-columns: 1fr; }
  .milestone-item { border-right: none; border-bottom: 1px solid var(--line); }
  .milestone-item:last-child { border-bottom: none; }
  .cta-inner { padding: 64px 0; }
  .cta-tel { font-size: 22px; }
  .about-media .frame { right: -8px; bottom: -14px; width: 68%; }
  .series-row { flex-direction: column; align-items: flex-start; padding: 24px; }
  .product-spec-table { font-size: 13px; }
  .product-spec-table th, .product-spec-table td { padding: 11px 12px; }
  .spec-list .row { grid-template-columns: 96px 1fr; }
  .back-top { right: 16px; bottom: 16px; }
}

/* ---------- 动效：减少运动偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}

/* 全局：线条型 SVG 图标默认描边随文字颜色 */
svg[fill="none"] { stroke: currentColor; }

/* 系列封面图（首页卡片 / 产品中心行） */
.series-card .sc-icon.has-img,
.series-row .sr-icon.has-img {
  padding: 0; background: #f7f8fa; border-color: var(--line); overflow: hidden;
}
.series-card .sc-icon.has-img { width: 100%; height: 118px; margin: 14px 0 18px; }
.series-row .sr-icon.has-img { width: 120px; height: 84px; }
.series-card .sc-icon.has-img img,
.series-row .sr-icon.has-img img { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: inherit; }
.series-card .sc-icon.has-img svg,
.series-row .sr-icon.has-img svg { display: none; }

/* 系列页产品图片缩略图 */
.pp-img { width: 96px; height: 64px; border-radius: 8px; overflow: hidden; background: #f5f6f8; border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; }
.pp-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.pp-ph { color: #c3c8cf; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; }
.pp-ph svg { width: 22px; height: 22px; stroke: currentColor; }