/* ============================================================
   石家庄频华电子科技有限公司 官网样式
   工业设备OEM制造服务商 · 深蓝 + 深灰 + 浅灰 · 稳重务实商务风
   设计原则：小圆角、弱阴影、细线分隔、克制动效、无玻璃拟态
   ============================================================ */

:root {
  --primary: #0f4c81;        /* 主色：稳重工业蓝（低饱和） */
  --primary-dark: #0a3358;   /* 深蓝：页头/页脚/深色板块 */
  --primary-light: #4a7cae;  /* 浅工业蓝：深色底上的图标/链接 */
  --accent: #c05f10;         /* 强调色：深橙，仅用于重点标签与小面积按钮 */
  --accent-light: #e8a55c;   /* 深橙浅调：仅用于深色底上的小标签 */
  --bg: #f5f6f8;             /* 页面浅灰底 */
  --bg-alt: #eceff3;         /* 交替区块浅灰 */
  --card: #ffffff;
  --text: #2a3440;           /* 正文深灰 */
  --text-light: #5d6c7b;     /* 次要文字 */
  --border: #d8dee6;         /* 细分割线 */
  --border-strong: #c3ccd6;  /* 输入框/控件描边 */
  --white: #ffffff;
  --radius: 4px;             /* 卡片/图片容器：小圆角 */
  --radius-sm: 3px;          /* 按钮/输入框：更小圆角 */
  --shadow: 0 1px 3px rgba(15, 40, 70, 0.07);
  --shadow-hover: 0 4px 14px rgba(15, 40, 70, 0.12);
  --maxw: 1200px;
  --transition: 0.25s ease;
  --font: "Roboto", "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

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

a { color: inherit; text-decoration: none; transition: color var(--transition); }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

h1, h2, h3, h4 { line-height: 1.4; }

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

/* ---------- 按钮（仅变色，无缩放弹跳） ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 26px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.btn-primary { background: var(--primary); color: var(--white); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-light { background: var(--white); color: var(--primary-dark); border-color: var(--white); }
.btn-light:hover { background: var(--bg-alt); color: var(--primary-dark); border-color: var(--bg-alt); }

/* ---------- 顶部导航（实底白 + 细线，无模糊玻璃效果） ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 2px 8px rgba(15, 40, 70, 0.08); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand svg { flex-shrink: 0; }
.brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary-dark);
  white-space: nowrap;
}

.main-nav ul { display: flex; align-items: center; gap: 2px; }
.main-nav a {
  display: block;
  padding: 8px 13px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); border-bottom-color: var(--primary); }

.header-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.lang-toggle {
  padding: 6px 14px;
  border: 1px solid var(--primary);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--primary);
  font-size: 13.5px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.lang-toggle:hover { background: var(--primary); color: var(--white); }

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  padding: 10px 9px;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.hamburger span {
  display: block; height: 2px; width: 100%;
  background: var(--primary-dark);
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero 通用页头（纯色深蓝，无装饰纹理） ---------- */
.page-hero {
  padding: 140px 0 60px;
  background: var(--primary-dark);
  color: var(--white);
  text-align: center;
}
.page-hero h1 { font-size: 34px; font-weight: 700; margin-bottom: 14px; }
.page-hero p { font-size: 16px; opacity: 0.82; max-width: 720px; margin: 0 auto; }
.breadcrumb { margin-top: 16px; font-size: 13.5px; opacity: 0.7; }
.breadcrumb a:hover { text-decoration: underline; }

/* ---------- 首页 Banner 轮播（平直蒙版 + 淡入淡出） ---------- */
.hero-banner { position: relative; height: 100vh; min-height: 600px; overflow: hidden; background: var(--primary-dark); }
.slide {
  position: absolute; inset: 0;
  opacity: 0;
  transition: opacity 0.9s ease;
  pointer-events: none;
}
.slide.active { opacity: 1; pointer-events: auto; }
.slide img { width: 100%; height: 100%; object-fit: cover; }
.slide::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(7, 26, 46, 0.86) 0%, rgba(7, 26, 46, 0.62) 48%, rgba(7, 26, 46, 0.42) 100%);
}
.slide-content {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 0; right: 0;
  transform: translateY(-50%);
  color: var(--white);
}
.slide-content .container { max-width: 820px; text-align: left; }
.slide-tag {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: var(--radius-sm);
  background: rgba(7, 26, 46, 0.35);
  font-size: 13.5px;
  letter-spacing: 1px;
  margin-bottom: 18px;
}
.slide-content h2 { font-size: 42px; line-height: 1.3; font-weight: 700; margin-bottom: 18px; text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35); }
.slide-content p { font-size: 17px; opacity: 0.92; margin-bottom: 30px; max-width: 620px; line-height: 1.8; }

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  width: 46px; height: 46px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-sm);
  background: rgba(7, 26, 46, 0.55);
  color: var(--white);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.carousel-btn:hover { background: var(--primary); }
.carousel-btn.prev { left: 24px; }
.carousel-btn.next { right: 24px; }

.carousel-dots {
  position: absolute;
  z-index: 5;
  bottom: 28px; left: 0; right: 0;
  display: flex;
  justify-content: center;
  gap: 10px;
}
.carousel-dots button {
  width: 10px; height: 10px;
  border-radius: 2px;
  border: 1px solid rgba(255, 255, 255, 0.75);
  background: transparent;
  cursor: pointer;
  padding: 0;
  transition: background var(--transition);
}
.carousel-dots button.active { background: var(--white); }

/* ---------- 通用区块（紧凑留白 + 细线/交替底色分隔） ---------- */
.section { padding: 64px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 44px; }
.section-head .eyebrow {
  display: inline-block;
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  margin-bottom: 10px;
}
.section-head h2 { font-size: 30px; font-weight: 700; color: var(--primary-dark); margin-bottom: 14px; }
.section-head p { color: var(--text-light); font-size: 15.5px; }

/* ---------- 卡片通用（轻微上浮，无放大无发光） ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 企业简介 ---------- */
.intro-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.intro-text h2 { font-size: 28px; color: var(--primary-dark); margin-bottom: 18px; }
.intro-text p { color: var(--text-light); margin-bottom: 16px; }
.intro-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.stat-box {
  background: var(--bg-alt);
  border-top: 3px solid var(--primary);
  padding: 16px 12px;
  text-align: center;
}
.stat-box .num { font-size: 28px; font-weight: 700; color: var(--primary); line-height: 1.2; }
.stat-box .label { font-size: 13px; color: var(--text-light); margin-top: 4px; }
.intro-img { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.intro-img img { width: 100%; height: 400px; object-fit: cover; }

/* ---------- 优势卡片（方形图标容器，非圆形） ---------- */
.adv-card { padding: 32px 26px; text-align: center; }
.adv-icon {
  width: 64px; height: 64px;
  margin: 0 auto 20px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}
.adv-icon img { width: 100%; height: 100%; object-fit: cover; }
.adv-card h3 { font-size: 19px; color: var(--primary-dark); margin-bottom: 10px; }
.adv-card p { font-size: 14.5px; color: var(--text-light); }

/* ---------- 业务卡片 ---------- */
.biz-card { display: flex; flex-direction: column; }
.biz-card .card-img { height: 220px; overflow: hidden; border-bottom: 1px solid var(--border); }
.biz-card .card-img img { width: 100%; height: 100%; object-fit: cover; }
.biz-card .card-body { padding: 26px 24px 28px; display: flex; flex-direction: column; flex: 1; }
.biz-card h3 { font-size: 20px; color: var(--primary-dark); margin-bottom: 12px; }
.biz-card p { font-size: 14.5px; color: var(--text-light); margin-bottom: 20px; flex: 1; }
.card-link {
  color: var(--primary);
  font-weight: 600;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.card-link:hover { color: var(--primary-dark); }
.card-link::after { content: "\2192"; }

/* ---------- 行业应用 ---------- */
.app-card { position: relative; height: 280px; border-radius: var(--radius); overflow: hidden; cursor: pointer; }
.app-card img { width: 100%; height: 100%; object-fit: cover; }
.app-card::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(9, 32, 56, 0.88) 0%, rgba(9, 32, 56, 0.32) 55%, rgba(9, 32, 56, 0.05) 100%);
}
.app-card .app-info { position: absolute; z-index: 2; left: 22px; right: 22px; bottom: 20px; color: var(--white); }
.app-card h3 { font-size: 19px; margin-bottom: 4px; }
.app-card p { font-size: 14px; opacity: 0.9; }

/* ---------- 客户LOGO墙（白底直角框，无单独悬浮特效） ---------- */
.logo-wall { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.logo-item {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 20px 10px 14px;
  text-align: center;
  transition: border-color var(--transition);
  cursor: default;
}
.logo-item:hover { border-color: var(--primary); }
.logo-item img { width: 60px; height: 60px; object-fit: contain; margin: 0 auto 10px; }
.logo-item span { font-size: 13px; color: var(--text-light); }

/* ---------- 新闻 ---------- */
.news-card { display: flex; flex-direction: column; }
.news-card .card-img { height: 190px; overflow: hidden; border-bottom: 1px solid var(--border); }
.news-card .card-img img { width: 100%; height: 100%; object-fit: cover; }
.news-card .card-body { padding: 22px 22px 26px; display: flex; flex-direction: column; flex: 1; }
.news-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; font-size: 13px; }
.news-tag {
  padding: 2px 10px;
  border-radius: 2px;
  background: rgba(192, 95, 16, 0.1);
  color: var(--accent);
  font-weight: 600;
}
.news-date { color: var(--text-light); }
.news-card h3 { font-size: 17.5px; color: var(--primary-dark); margin-bottom: 10px; line-height: 1.55; }
.news-card p { font-size: 14px; color: var(--text-light); margin-bottom: 18px; flex: 1; }

.news-tabs { display: flex; justify-content: center; gap: 10px; margin-bottom: 40px; flex-wrap: wrap; }
.news-tabs button {
  padding: 8px 22px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--card);
  color: var(--text-light);
  font-size: 14.5px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.news-tabs button:hover { border-color: var(--primary); color: var(--primary); }
.news-tabs button.active { background: var(--primary); border-color: var(--primary); color: var(--white); }

/* ---------- 咨询表单 ---------- */
.contact-band {
  background: var(--primary-dark);
  color: var(--white);
  padding: 64px 0;
}
.contact-band .eyebrow { color: var(--accent-light); }
.contact-band .container { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: start; }
.contact-band h2 { font-size: 28px; margin-bottom: 16px; }
.contact-band .lead { opacity: 0.82; margin-bottom: 26px; }
.contact-tel-box {
  display: flex;
  align-items: center;
  gap: 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.contact-tel-box .tel-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-tel-box .tel-num { font-size: 22px; font-weight: 700; }
.contact-tel-box .tel-label { font-size: 13px; opacity: 0.8; }

.form-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; color: var(--text); }
.form-card h3 { font-size: 20px; color: var(--primary-dark); margin-bottom: 22px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.form-row label .req { color: #b53a2e; margin-left: 2px; }
.form-row input,
.form-row textarea,
.form-row select {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--white);
  transition: border-color var(--transition);
}
.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus {
  outline: none;
  border-color: var(--primary);
}
.form-row textarea { min-height: 120px; resize: vertical; }
.form-row .err-msg {
  display: none;
  color: #b53a2e;
  font-size: 13px;
  margin-top: 6px;
}
.form-row.invalid input,
.form-row.invalid textarea { border-color: #b53a2e; }
.form-row.invalid .err-msg { display: block; }
.form-success {
  display: none;
  background: #f2f8f3;
  border: 1px solid #bcd9c0;
  border-left: 3px solid #4c8a54;
  color: #2f6b36;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 14px;
  margin-top: 16px;
}
.form-success.show { display: block; }
.form-note { font-size: 12.5px; color: var(--text-light); margin-top: 14px; }

/* ---------- 页脚（务实规整，无复杂装饰） ---------- */
.site-footer { background: #0a243f; color: rgba(255, 255, 255, 0.82); }
.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding: 56px 0 40px;
}
.footer-brand .brand-name { color: var(--white); font-size: 19px; display: block; margin-bottom: 6px; }
.footer-brand .brand-en { font-size: 13px; opacity: 0.6; display: block; margin-bottom: 16px; line-height: 1.5; }
.footer-brand p { font-size: 14px; opacity: 0.75; }
.footer-col h4 { font-size: 16px; color: var(--white); margin-bottom: 18px; position: relative; padding-bottom: 10px; }
.footer-col h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 28px; height: 2px; background: var(--accent); }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { font-size: 14px; opacity: 0.78; }
.footer-col ul li a:hover { opacity: 1; color: var(--white); }
.footer-contact li { font-size: 14px; opacity: 0.78; margin-bottom: 14px; display: flex; gap: 10px; line-height: 1.6; }
.footer-contact .fi { color: var(--primary-light); flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  opacity: 0.65;
}
.footer-icp { text-align: center; line-height: 1.9; }
.footer-icp a { display: block; }
.footer-icp a:hover { color: var(--white); text-decoration: underline; }
.footer-bottom > :last-child { text-align: right; }

/* ---------- 时间轴（发展历程） ---------- */
.timeline { position: relative; max-width: 860px; margin: 0 auto; padding: 20px 0; }
.timeline::before {
  content: "";
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 2px;
  background: var(--border-strong);
  transform: translateX(-50%);
}
.tl-item { position: relative; width: 50%; padding: 0 44px 40px 0; }
.tl-item:nth-child(even) { margin-left: 50%; padding: 0 0 40px 44px; }
.tl-item::after {
  content: "";
  position: absolute;
  top: 6px; right: -7px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg-alt);
}
.tl-item:nth-child(even)::after { right: auto; left: -7px; }
.tl-year { font-size: 20px; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.tl-item h4 { font-size: 16.5px; color: var(--primary-dark); margin-bottom: 6px; }
.tl-item p { font-size: 14px; color: var(--text-light); }

/* ---------- 企业文化 MVV ---------- */
.mvv-card { padding: 36px 28px; text-align: center; border-top: 3px solid var(--primary); }
.mvv-card .mvv-icon { margin-bottom: 14px; }
.mvv-card .mvv-icon img { width: 52px; height: 52px; object-fit: contain; margin: 0 auto; }
.mvv-card h3 { font-size: 19px; color: var(--primary-dark); margin-bottom: 10px; }
.mvv-card p { font-size: 14.5px; color: var(--text-light); }

/* ---------- 证书 ---------- */
.cert-card { cursor: zoom-in; }
.cert-card .card-img { height: 250px; background: var(--bg-alt); display: flex; align-items: center; justify-content: center; padding: 20px; border-bottom: 1px solid var(--border); }
.cert-card .card-img img { max-height: 100%; width: auto; object-fit: contain; box-shadow: 0 2px 8px rgba(10, 47, 87, 0.12); }
.cert-card .card-body { padding: 20px 24px 26px; text-align: center; }
.cert-card h3 { font-size: 17px; color: var(--primary-dark); margin-bottom: 6px; }
.cert-card p { font-size: 13px; color: var(--text-light); }

/* ---------- 服务流程 ---------- */
.flow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: flow; }
.flow-step {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 20px 24px;
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition);
  counter-increment: flow;
}
.flow-step::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  top: -18px; left: 50%;
  transform: translateX(-50%);
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  font-weight: 700;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
}
.flow-step:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.flow-step h4 { font-size: 16.5px; color: var(--primary-dark); margin-bottom: 8px; }
.flow-step p { font-size: 13.5px; color: var(--text-light); }

/* ---------- FAQ（简洁箭头，平缓展开） ---------- */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; transition: border-color var(--transition); }
.faq-item.open { border-color: var(--primary); }
.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  background: none;
  border: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--primary-dark);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}
.faq-q .faq-icon {
  flex-shrink: 0;
  width: 26px; height: 26px;
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}
.faq-item.open .faq-q .faq-icon { transform: rotate(45deg); background: var(--primary); color: var(--white); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-a-inner { padding: 0 22px 20px; font-size: 15px; color: var(--text-light); }

/* ---------- 工厂画廊 ---------- */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: zoom-in;
  height: 250px;
  border: 1px solid var(--border);
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; }
.gallery-item .gallery-caption {
  position: absolute;
  z-index: 2;
  left: 0; right: 0; bottom: 0;
  padding: 12px 16px;
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
  background: linear-gradient(to top, rgba(9, 32, 56, 0.85), rgba(9, 32, 56, 0));
}
.gallery-item .zoom-hint {
  position: absolute;
  z-index: 2;
  top: 12px; right: 12px;
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.92);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  opacity: 0;
  transition: opacity var(--transition);
}
.gallery-item:hover .zoom-hint { opacity: 1; }

/* ---------- 图片放大弹窗（朴素预览） ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(5, 16, 30, 0.94);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 36px;
}
.lightbox.show { display: flex; }
.lightbox img { max-width: 90%; max-height: 86%; }
.lightbox-close {
  position: absolute;
  top: 18px; right: 22px;
  width: 42px; height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
  font-size: 22px;
  cursor: pointer;
  transition: background var(--transition);
}
.lightbox-close:hover { background: var(--primary); }
.lightbox-caption { position: absolute; bottom: 22px; left: 0; right: 0; text-align: center; color: rgba(255, 255, 255, 0.75); font-size: 13.5px; }

/* ---------- 产品方案页 ---------- */
.product-block { margin-bottom: 72px; }
.product-block:last-child { margin-bottom: 0; }
.product-head { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.product-head .p-index {
  width: 52px; height: 52px;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: var(--white);
  font-size: 22px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.product-head h2 { font-size: 26px; color: var(--primary-dark); }
.product-head p { font-size: 14px; color: var(--text-light); margin-top: 2px; }
.product-body { display: grid; grid-template-columns: 1fr 1.15fr; gap: 40px; align-items: start; }
.product-body.reversed { grid-template-columns: 1.15fr 1fr; }
.product-imgs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.product-imgs .pi-main { grid-column: 1 / -1; height: 290px; border-radius: var(--radius); overflow: hidden; cursor: zoom-in; border: 1px solid var(--border); }
.product-imgs .pi-sub { height: 170px; border-radius: var(--radius); overflow: hidden; cursor: zoom-in; border: 1px solid var(--border); }
.product-imgs img { width: 100%; height: 100%; object-fit: cover; }
.product-info h4 { font-size: 17px; color: var(--primary); margin: 20px 0 8px; display: flex; align-items: center; gap: 8px; }
.product-info h4::before { content: ""; width: 3px; height: 16px; background: var(--primary); }
.product-info h4:first-child { margin-top: 0; }
.product-info p, .product-info li { font-size: 15px; color: var(--text-light); }
.product-info ul { display: grid; gap: 8px; margin-top: 4px; }
.product-info ul li { padding-left: 22px; position: relative; }
.product-info ul li::before { content: "\25B8"; position: absolute; left: 0; color: var(--primary); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 44px; align-items: start; }
.contact-info-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; }
.contact-info-card h3 { font-size: 21px; color: var(--primary-dark); margin-bottom: 20px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.ci-item { display: flex; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--border); }
.ci-item:last-child { border-bottom: none; }
.ci-item .ci-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 19px;
  flex-shrink: 0;
}
.ci-item .ci-label { font-size: 13px; color: var(--text-light); margin-bottom: 4px; }
.ci-item .ci-value { font-size: 16px; font-weight: 600; color: var(--text); line-height: 1.6; }
.map-placeholder {
  margin-top: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--text-light);
  text-align: center;
  padding: 24px;
  min-height: 300px;
}
.map-placeholder .map-icon { font-size: 36px; color: var(--primary); }
.map-placeholder strong { font-size: 17px; color: var(--primary-dark); }
.map-placeholder .map-addr { font-size: 15px; color: var(--text); line-height: 1.7; max-width: 420px; }
.business-note { background: var(--bg-alt); border-left: 3px solid var(--primary); padding: 22px 26px; border-radius: var(--radius-sm); margin-top: 32px; }
.business-note h4 { font-size: 17px; color: var(--primary-dark); margin-bottom: 10px; }
.business-note p { font-size: 14.5px; color: var(--text-light); }

/* ---------- 新闻详情 ---------- */
.article { max-width: 860px; margin: 0 auto; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 44px; }
.article h1 { font-size: 28px; color: var(--primary-dark); line-height: 1.4; margin-bottom: 18px; }
.article .article-meta { display: flex; gap: 16px; font-size: 14px; color: var(--text-light); padding-bottom: 22px; border-bottom: 1px solid var(--border); margin-bottom: 28px; flex-wrap: wrap; }
.article-img { border-radius: var(--radius); overflow: hidden; margin-bottom: 28px; border: 1px solid var(--border); }
.article-img img { width: 100%; height: 380px; object-fit: cover; }
.article p { font-size: 16px; color: var(--text); margin-bottom: 18px; line-height: 1.85; }
.article h2 { font-size: 21px; color: var(--primary-dark); margin: 28px 0 14px; }
.article ul { margin: 0 0 18px 0; }
.article ul li { padding-left: 22px; position: relative; font-size: 16px; margin-bottom: 8px; }
.article ul li::before { content: "\25B8"; position: absolute; left: 0; color: var(--primary); }
.article-nav { display: flex; justify-content: space-between; gap: 16px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); flex-wrap: wrap; }

/* ---------- 404 ---------- */
.nf-wrap { text-align: center; padding: 160px 0 100px; }
.nf-code { font-size: 110px; font-weight: 700; color: var(--primary); line-height: 1; }
.nf-wrap h2 { font-size: 26px; color: var(--primary-dark); margin: 18px 0 12px; }
.nf-wrap p { color: var(--text-light); margin-bottom: 32px; }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 24px; bottom: 28px;
  z-index: 900;
  width: 46px; height: 46px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--primary);
  color: var(--white);
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background var(--transition);
  box-shadow: var(--shadow);
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--primary-dark); }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: repeat(2, 1fr); }
  .logo-wall { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 920px) {
  .main-nav {
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    box-shadow: 0 8px 16px rgba(15, 40, 70, 0.08);
  }
  .main-nav.open { max-height: 520px; }
  .main-nav ul { flex-direction: column; align-items: stretch; padding: 8px 24px 16px; gap: 0; }
  .main-nav a { padding: 14px 4px; border-bottom: 1px solid var(--bg-alt); }
  .main-nav li:last-child a { border-bottom: none; }
  .main-nav a:hover, .main-nav a.active { color: var(--primary); border-bottom-color: var(--bg-alt); }
  .hamburger { display: flex; }
  .brand-name { font-size: 16px; max-width: 190px; white-space: normal; line-height: 1.3; }

  .intro-grid { grid-template-columns: 1fr; gap: 36px; }
  .intro-img img { height: 300px; }
  .product-body, .product-body.reversed { grid-template-columns: 1fr; }
  .contact-band .container { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; }
  .slide-content h2 { font-size: 30px; }
  .hero-banner { min-height: 540px; height: 92vh; }
  .page-hero { padding: 116px 0 52px; }
  .page-hero h1 { font-size: 28px; }
  .article { padding: 28px 22px; }
  .article-img img { height: 260px; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
  .flow-steps { grid-template-columns: 1fr; }
  .logo-wall { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
  .section-head h2 { font-size: 24px; }
  .intro-stats { grid-template-columns: 1fr; }
  .timeline::before { left: 12px; }
  .tl-item, .tl-item:nth-child(even) { width: 100%; margin-left: 0; padding: 0 0 36px 40px; }
  .tl-item::after, .tl-item:nth-child(even)::after { left: 5px; right: auto; }
  .slide-content h2 { font-size: 25px; }
  .slide-content p { font-size: 15px; }
  .carousel-btn { width: 40px; height: 40px; }
  .carousel-btn.prev { left: 12px; }
  .carousel-btn.next { right: 12px; }
  .form-card { padding: 24px; }
  .footer-main { grid-template-columns: 1fr; gap: 32px; padding: 44px 0 32px; }
  .footer-bottom { grid-template-columns: 1fr; justify-items: center; text-align: center; gap: 8px; }
  .footer-bottom > :last-child { text-align: center; }
  .nf-code { font-size: 80px; }
}