/* ============================================================
   JINGHAI 企业官网样式
   配色: 工业钢蓝 (#14508c) + 冷灰中性色, 全站直角, 单主题(浅色)
   ============================================================ */

:root {
  --accent: #14508c;
  --accent-dark: #0d3763;
  --navy: #0d2b4b;
  --ink: #1c2733;
  --gray-700: #3d4a57;
  --gray-500: #6b7885;
  --gray-300: #c9d2da;
  --gray-200: #dde4ea;
  --gray-100: #f4f6f8;
  --white: #ffffff;
  --line: #e3e8ed;
  --maxw: 1200px;
  --font: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  font-size: 16px;
  line-height: 1.7;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.85);
  font-size: 13px;
  padding: 6px 0;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.topbar a { color: rgba(255, 255, 255, 0.85); }
.topbar a:hover { color: #fff; }
.topbar-right span { margin-left: 20px; }

/* ---------- 主导航 ---------- */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px; height: 42px;
  background: var(--accent);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 18px;
  letter-spacing: 1px;
}
.brand-name { font-size: 20px; font-weight: 700; color: var(--navy); line-height: 1.2; }
.brand-en { font-size: 11px; color: var(--gray-500); letter-spacing: 2px; text-transform: uppercase; }

.nav-menu { display: flex; gap: 4px; }
.nav-menu a {
  display: block;
  padding: 24px 18px;
  font-size: 15px;
  color: var(--gray-700);
  border-bottom: 3px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.nav-menu a:hover { color: var(--accent); }
.nav-menu a.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.nav-toggle {
  display: none;
  background: none; border: none;
  width: 40px; height: 40px;
  cursor: pointer;
}
.nav-toggle span {
  display: block; height: 2px; background: var(--ink);
  margin: 6px 8px; transition: 0.25s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- 页面横幅(内页) ---------- */
.page-banner {
  background: linear-gradient(120deg, var(--navy) 0%, var(--accent-dark) 60%, var(--accent) 100%);
  color: #fff;
  padding: 64px 0;
  position: relative;
  overflow: hidden;
}
.page-banner::after {
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(
    -55deg, transparent 0 28px, rgba(255,255,255,0.04) 28px 56px);
  pointer-events: none;
}
.page-banner h1 { font-size: 34px; letter-spacing: 2px; }
.page-banner p { margin-top: 8px; color: rgba(255,255,255,0.75); font-size: 14px; letter-spacing: 1px; }
.crumbs { font-size: 13px; color: rgba(255,255,255,0.65); margin-top: 14px; }
.crumbs a:hover { color: #fff; }

/* ---------- 首页 Hero ---------- */
.hero {
  background:
    linear-gradient(rgba(13, 43, 75, 0.82), rgba(13, 43, 75, 0.88)),
    repeating-linear-gradient(90deg, #16283d 0 120px, #1a2f47 120px 240px);
  color: #fff;
  padding: 96px 0 0;
}
.hero-inner { padding-bottom: 72px; max-width: 720px; }
.hero-tag {
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.35);
  padding: 5px 14px;
  font-size: 13px;
  letter-spacing: 3px;
  margin-bottom: 24px;
  color: rgba(255,255,255,0.9);
}
.hero h1 { font-size: 44px; line-height: 1.3; letter-spacing: 2px; }
.hero h1 em { font-style: normal; color: #7fb2e5; }
.hero-sub {
  margin-top: 18px;
  font-size: 16px;
  color: rgba(255,255,255,0.78);
  max-width: 34em;
}
.hero-ctas { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 34px;
  font-size: 15px;
  letter-spacing: 1px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  text-align: center;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-outline { border-color: rgba(255,255,255,0.6); color: #fff; background: transparent; }
.btn-outline:hover { background: rgba(255,255,255,0.12); }
.btn-dark { background: var(--navy); color: #fff; }
.btn-dark:hover { background: var(--accent); }

/* Hero 底部数据条 */
.hero-stats {
  border-top: 1px solid rgba(255,255,255,0.15);
  background: rgba(0,0,0,0.18);
}
.hero-stats .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat { padding: 26px 10px; text-align: center; border-left: 1px solid rgba(255,255,255,0.12); }
.stat:first-child { border-left: none; }
.stat-num { font-size: 34px; font-weight: 700; color: #fff; }
.stat-num small { font-size: 15px; font-weight: 400; margin-left: 4px; color: rgba(255,255,255,0.7); }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.65); margin-top: 2px; }

/* ---------- 通用区块 ---------- */
.section { padding: 72px 0; }
.section.alt { background: var(--gray-100); }
.section-head { text-align: center; margin-bottom: 48px; }
.section-head h2 { font-size: 30px; color: var(--navy); letter-spacing: 2px; }
.section-head .rule {
  width: 46px; height: 3px; background: var(--accent);
  margin: 16px auto 0;
}
.section-head p { margin-top: 14px; color: var(--gray-500); font-size: 14px; }

/* 滚动渐显 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 产品分类卡 ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.cat-card { background: #fff; border: 1px solid var(--line); transition: transform 0.25s, box-shadow 0.25s; }
.cat-card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(13,43,75,0.10); }
.cat-img { aspect-ratio: 4 / 3; }
.cat-body { padding: 20px; }
.cat-body h3 { font-size: 18px; color: var(--navy); }
.cat-body p { font-size: 13px; color: var(--gray-500); margin-top: 6px; }
.cat-more { display: inline-block; margin-top: 12px; font-size: 13px; color: var(--accent); }
.cat-card:hover .cat-more { text-decoration: underline; }

/* 图片占位(待替换为真实产品照片) */
.ph {
  background:
    linear-gradient(135deg, #2c435c 0%, #51687f 45%, #8ba0b4 55%, #51687f 65%, #2c435c 100%);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.85);
  font-size: 14px; letter-spacing: 2px;
  position: relative;
  overflow: hidden;
}
.ph::after {
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg, transparent 0 7px, rgba(255,255,255,0.05) 7px 8px);
}
.ph-light {
  background: linear-gradient(135deg, #d7dee5, #eef2f5);
  color: var(--gray-500);
}
.ph-tall { aspect-ratio: 3 / 3.4; }

/* ---------- 关于我们(首页摘要) ---------- */
.about-split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-text h2 { font-size: 30px; color: var(--navy); letter-spacing: 2px; }
.about-text .rule { width: 46px; height: 3px; background: var(--accent); margin: 16px 0 22px; }
.about-text p { color: var(--gray-700); margin-bottom: 14px; font-size: 15px; }
.edge-list { margin: 22px 0 30px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px 24px; }
.edge-list li {
  padding-left: 16px; position: relative; font-size: 14px; color: var(--gray-700);
}
.edge-list li::before {
  content: ""; position: absolute; left: 0; top: 10px;
  width: 7px; height: 7px; background: var(--accent);
}

/* ---------- 应用领域 ---------- */
.field-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.field-item {
  background: #fff; border: 1px solid var(--line);
  padding: 26px 10px; text-align: center;
  transition: border-color 0.2s, background 0.2s;
}
.field-item:hover { border-color: var(--accent); }
.field-item .fnum { font-size: 22px; font-weight: 700; color: var(--accent); }
.field-item h3 { font-size: 15px; margin-top: 8px; color: var(--navy); }
.field-item p { font-size: 12px; color: var(--gray-500); margin-top: 4px; }

/* ---------- 新闻 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-item { border: 1px solid var(--line); background: #fff; transition: box-shadow 0.25s; }
.news-item:hover { box-shadow: 0 10px 26px rgba(13,43,75,0.10); }
.news-date {
  display: inline-block; background: var(--accent); color: #fff;
  font-size: 12px; padding: 3px 12px; margin: 20px 20px 0;
}
.news-body { padding: 14px 20px 22px; }
.news-body h3 { font-size: 16px; color: var(--navy); line-height: 1.5; }
.news-body p { font-size: 13px; color: var(--gray-500); margin-top: 8px; }

/* ---------- CTA 条 ---------- */
.cta-band { background: linear-gradient(120deg, var(--navy), var(--accent-dark)); color: #fff; }
.cta-band .container {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 44px; padding-bottom: 44px; gap: 24px; flex-wrap: wrap;
}
.cta-band h2 { font-size: 26px; letter-spacing: 1px; }
.cta-band p { color: rgba(255,255,255,0.72); margin-top: 6px; font-size: 14px; }
.cta-phone { font-size: 28px; font-weight: 700; letter-spacing: 1px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #10202f; color: rgba(255,255,255,0.72); }
.footer-main {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px; padding: 56px 0 40px;
}
.footer-main h4 { color: #fff; font-size: 16px; margin-bottom: 18px; letter-spacing: 1px; }
.footer-main li { font-size: 14px; margin-bottom: 10px; }
.footer-main a:hover { color: #fff; }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { font-size: 13px; margin-top: 14px; max-width: 30em; }
.footer-contact li { padding-left: 0; }
.footer-contact span { color: rgba(255,255,255,0.45); margin-right: 8px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 18px 0; font-size: 13px; color: rgba(255,255,255,0.45);
}
.footer-bottom .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ---------- 产品页 ---------- */
.product-layout { display: grid; grid-template-columns: 250px 1fr; gap: 40px; }
.side-cat { border: 1px solid var(--line); }
.side-cat h3 {
  background: var(--navy); color: #fff; font-size: 16px;
  padding: 14px 18px; letter-spacing: 1px;
}
.side-cat a {
  display: block; padding: 13px 18px; font-size: 14px;
  border-bottom: 1px solid var(--line); color: var(--gray-700);
}
.side-cat a:hover, .side-cat a.active { color: var(--accent); background: var(--gray-100); font-weight: 600; }
.side-contact { margin-top: 24px; background: var(--gray-100); border: 1px solid var(--line); padding: 22px; }
.side-contact h4 { color: var(--navy); font-size: 15px; margin-bottom: 10px; }
.side-contact p { font-size: 13px; color: var(--gray-500); }
.side-contact .tel { font-size: 20px; font-weight: 700; color: var(--accent); margin-top: 6px; }

.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.filter-btn {
  border: 1px solid var(--gray-300); background: #fff;
  padding: 8px 20px; font-size: 13px; cursor: pointer; color: var(--gray-700);
  transition: 0.2s;
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.product-card { border: 1px solid var(--line); background: #fff; transition: box-shadow 0.25s, transform 0.25s; }
.product-card:hover { box-shadow: 0 10px 26px rgba(13,43,75,0.10); transform: translateY(-3px); }
.product-card .ph { aspect-ratio: 4 / 3; }
.product-info { padding: 16px 18px 20px; }
.product-info h3 { font-size: 16px; color: var(--navy); }
.product-grade { font-size: 12px; color: var(--gray-500); margin-top: 4px; }
.product-spec { font-size: 13px; color: var(--gray-700); margin-top: 8px; }

/* ---------- 产品详情 ---------- */
.detail-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.detail-info h1 { font-size: 28px; color: var(--navy); }
.detail-info .grade-tags { margin: 14px 0 20px; }
.tag {
  display: inline-block; background: var(--gray-100); border: 1px solid var(--line);
  font-size: 12px; padding: 3px 12px; margin-right: 8px; color: var(--gray-700);
}
.detail-info p { font-size: 15px; color: var(--gray-700); margin-bottom: 14px; }
.spec-table { width: 100%; border-collapse: collapse; margin: 18px 0 26px; font-size: 14px; }
.spec-table th, .spec-table td { border: 1px solid var(--line); padding: 10px 14px; text-align: left; }
.spec-table th { background: var(--gray-100); color: var(--navy); width: 34%; font-weight: 600; }

/* ---------- 关于我们页 ---------- */
.timeline { position: relative; margin-top: 20px; padding-left: 26px; border-left: 2px solid var(--gray-200); }
.timeline li { position: relative; padding-bottom: 30px; }
.timeline li::before {
  content: ""; position: absolute; left: -33px; top: 6px;
  width: 12px; height: 12px; background: var(--accent);
  border: 3px solid #fff; box-shadow: 0 0 0 2px var(--accent);
}
.timeline .year { font-size: 20px; font-weight: 700; color: var(--accent); }
.timeline p { font-size: 14px; color: var(--gray-700); margin-top: 4px; }

.honor-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.honor-item {
  border: 1px solid var(--line); padding: 28px 16px; text-align: center; background: #fff;
}
.honor-item .h-ico {
  width: 52px; height: 52px; margin: 0 auto 14px;
  border: 2px solid var(--accent); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 700;
}
.honor-item h3 { font-size: 15px; color: var(--navy); }
.honor-item p { font-size: 12px; color: var(--gray-500); margin-top: 6px; }

/* ---------- 新闻页 ---------- */
.news-list .news-row {
  display: grid; grid-template-columns: 110px 1fr; gap: 24px;
  padding: 26px 0; border-bottom: 1px solid var(--line);
  transition: background 0.2s;
}
.news-list .news-row:hover { background: var(--gray-100); }
.news-row .date { text-align: center; }
.news-row .date .d { font-size: 30px; font-weight: 700; color: var(--accent); line-height: 1.1; }
.news-row .date .ym { font-size: 13px; color: var(--gray-500); }
.news-row h3 { font-size: 18px; color: var(--navy); }
.news-row p { font-size: 14px; color: var(--gray-500); margin-top: 6px; }

/* ---------- 联系我们 ---------- */
.contact-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.contact-info-card { border: 1px solid var(--line); padding: 26px; margin-bottom: 18px; background: #fff; }
.contact-info-card h3 { font-size: 17px; color: var(--navy); margin-bottom: 10px; }
.contact-info-card p { font-size: 14px; color: var(--gray-700); margin-bottom: 6px; }
.contact-info-card .big { font-size: 24px; font-weight: 700; color: var(--accent); }

.form-box { border: 1px solid var(--line); padding: 32px; background: #fff; }
.form-box h3 { font-size: 20px; color: var(--navy); margin-bottom: 20px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; color: var(--gray-700); margin-bottom: 6px; }
.form-group label i { color: #c0392b; font-style: normal; margin-right: 4px; }
.form-group input, .form-group textarea {
  width: 100%; border: 1px solid var(--gray-300); padding: 11px 14px;
  font-size: 14px; font-family: var(--font); color: var(--ink);
  transition: border-color 0.2s; background: #fff;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(20, 80, 140, 0.12);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-tip { font-size: 12px; color: var(--gray-500); margin-top: 4px; }
.form-success {
  display: none; background: #eaf4ea; border: 1px solid #b7d9b7;
  color: #2e6b2e; padding: 12px 16px; font-size: 14px; margin-top: 16px;
}
.form-success.show { display: block; }

.map-box { margin-top: 56px; }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .field-grid { grid-template-columns: repeat(3, 1fr); }
  .news-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .honor-grid { grid-template-columns: repeat(2, 1fr); }
  .product-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .topbar { display: none; }
  .nav-toggle { display: block; }
  .nav-menu {
    position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0;
    border-bottom: 1px solid var(--line);
    display: none;
  }
  .nav-menu.show { display: flex; }
  .nav-menu a { padding: 14px 20px; border-bottom: 1px solid var(--gray-100); }
  .hero { padding-top: 64px; }
  .hero h1 { font-size: 30px; }
  .hero-stats .container { grid-template-columns: repeat(2, 1fr); }
  .stat { border-left: none; border-top: 1px solid rgba(255,255,255,0.12); }
  .about-split, .detail-layout, .contact-layout { grid-template-columns: 1fr; }
  .edge-list { grid-template-columns: 1fr; }
  .field-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-grid, .product-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .cta-band .container { flex-direction: column; align-items: flex-start; }
  .news-list .news-row { grid-template-columns: 1fr; gap: 8px; }
  .section { padding: 52px 0; }
  .hero-inner { padding-bottom: 48px; }
}