:root {
  --navy: #1b3a7a;
  --navy-dark: #12285a;
  --red: #d7262e;
  --ink: #222;
  --text: #555;
  --line: #e3e6eb;
  --gray: #f4f6f9;
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.8;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--red); }
p { margin: 0 0 14px; color: var(--text); }
h1, h2, h3, h4 { margin: 0; color: var(--ink); font-weight: 700; }
:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

.wrap { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

/* 顶部信息条 */
.topbar { background: var(--navy-dark); color: #c9d4ea; font-size: 13px; }
.topbar .wrap { display: flex; justify-content: space-between; gap: 16px; padding: 7px 0; }
.topbar a { color: #fff; }

/* 头部 */
.site-header { background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 82px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand:hover { color: inherit; }
.logo {
  font-family: Arial Black, Arial, sans-serif;
  font-size: 30px;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -2px;
  line-height: 1;
}
.logo .k { color: var(--navy); }
.logo .d { color: var(--red); }
.brand-name strong { display: block; font-size: 19px; letter-spacing: 1px; color: var(--ink); }
.brand-name small { display: block; font-size: 11px; color: #8a93a3; letter-spacing: 0.3px; }

.nav { display: flex; gap: 4px; }
.nav a { display: block; padding: 28px 16px; font-size: 16px; color: var(--ink); position: relative; }
.nav a::after { content: ""; position: absolute; left: 16px; right: 16px; bottom: 0; height: 3px; background: var(--red); transform: scaleX(0); transition: transform .2s; }
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--navy); font-weight: 700; }

.hotline { display: flex; align-items: center; gap: 10px; }
.hotline span { font-size: 12px; color: #8a93a3; display: block; line-height: 1.3; }
.hotline strong { font-size: 20px; color: var(--red); font-family: Arial, sans-serif; line-height: 1.3; }

.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-btn { display: none; border: 1px solid var(--line); padding: 6px 14px; cursor: pointer; font-size: 14px; }

/* 首页横幅 */
.banner {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  color: #fff;
  background: var(--navy-dark) url("../assets/reciprocator.jpg") center / cover no-repeat;
}
.banner::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(14,32,74,.92) 0%, rgba(14,32,74,.72) 48%, rgba(14,32,74,.25) 100%); }
.banner .wrap { position: relative; }
.banner h1 { color: #fff; font-size: 46px; line-height: 1.3; letter-spacing: 2px; margin-bottom: 18px; }
.banner .tags { font-size: 18px; color: #dfe6f5; margin-bottom: 10px; letter-spacing: 1px; }
.banner p { color: #c9d4ea; max-width: 560px; font-size: 16px; }
.banner .actions { margin-top: 28px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn { display: inline-block; padding: 11px 30px; background: var(--red); color: #fff; font-size: 15px; border: 1px solid var(--red); }
.btn:hover { background: #b81d24; color: #fff; }
.btn.line { background: transparent; border-color: rgba(255,255,255,.7); }
.btn.line:hover { background: #fff; color: var(--navy); }
.btn.navy { background: var(--navy); border-color: var(--navy); }
.btn.navy:hover { background: var(--navy-dark); }

/* 内页横幅 */
.page-banner {
  position: relative;
  height: 240px;
  display: flex;
  align-items: center;
  background: var(--navy-dark) center / cover no-repeat;
  color: #fff;
}
.page-banner::before { content: ""; position: absolute; inset: 0; background: rgba(14,32,74,.72); }
.page-banner .wrap { position: relative; }
.page-banner h1 { color: #fff; font-size: 34px; letter-spacing: 3px; }
.page-banner p { color: #c9d4ea; margin: 6px 0 0; letter-spacing: 2px; font-size: 13px; text-transform: uppercase; }
.crumb { background: var(--gray); border-bottom: 1px solid var(--line); font-size: 13px; color: #888; }
.crumb .wrap { padding: 12px 0; }
.crumb a { color: #666; }

/* 栏目 */
.section { padding: 76px 0; }
.section.gray { background: var(--gray); }
.title { text-align: center; margin-bottom: 46px; }
.title h2 { font-size: 30px; letter-spacing: 2px; }
.title .en { display: block; margin-top: 4px; font-size: 13px; letter-spacing: 3px; color: #a1a8b5; text-transform: uppercase; }
.title::after { content: ""; display: block; width: 46px; height: 3px; background: var(--red); margin: 16px auto 0; }
.title-left { margin-bottom: 22px; }
.title-left h2 { font-size: 26px; padding-left: 14px; border-left: 4px solid var(--red); line-height: 1.2; }
.title-left .en { display: block; font-size: 12px; color: #a1a8b5; letter-spacing: 2px; padding-left: 18px; margin-top: 6px; text-transform: uppercase; }

/* 首页简介 */
.intro { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.intro h3 { font-size: 24px; margin-bottom: 18px; }
.intro p { text-indent: 2em; }
.intro .more { margin-top: 10px; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 56px; background: var(--navy); color: #fff; }
.stats div { padding: 28px 20px; text-align: center; border-right: 1px solid rgba(255,255,255,.14); }
.stats div:last-child { border-right: 0; }
.stats strong { display: block; font-size: 34px; font-family: Arial, sans-serif; line-height: 1.2; }
.stats strong small { font-size: 15px; margin-left: 2px; }
.stats span { font-size: 14px; color: #c9d4ea; }

/* 卡片 */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.card { background: #fff; border: 1px solid var(--line); transition: border-color .2s, transform .2s; }
.card:hover { border-color: var(--navy); transform: translateY(-3px); }
.card .pic { aspect-ratio: 4 / 3; overflow: hidden; background: #eef0f3; }
.card .pic img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.card:hover .pic img { transform: scale(1.04); }
.card .body { padding: 20px 22px 8px; }
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card .body p { font-size: 14px; }
.card .link { display: inline-block; font-size: 14px; color: var(--navy); margin-bottom: 16px; }
.card .link:hover { color: var(--red); }

.photo { position: relative; overflow: hidden; background: #eef0f3; }
.photo img { width: 100%; height: 100%; object-fit: cover; }
.photo figcaption { position: absolute; left: 0; right: 0; bottom: 0; padding: 10px 16px; color: #fff; background: linear-gradient(transparent, rgba(0,0,0,.7)); font-size: 15px; }
.photo-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; grid-template-rows: 220px 220px; gap: 14px; }
.photo-grid .big { grid-row: span 2; }
figure { margin: 0; }

/* 优势 */
.adv { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.adv div { background: #fff; padding: 30px 24px; border-top: 3px solid var(--navy); }
.adv b { display: block; font-size: 40px; font-family: Arial, sans-serif; color: #e7ebf2; line-height: 1; margin-bottom: 10px; }
.adv h3 { font-size: 18px; margin-bottom: 8px; }
.adv p { font-size: 14px; margin: 0; }

/* 流程 */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: s; }
.flow li { list-style: none; text-align: center; position: relative; padding: 0 10px; }
.flow li::before { counter-increment: s; content: counter(s, decimal-leading-zero); display: grid; place-items: center; width: 64px; height: 64px; margin: 0 auto 14px; border-radius: 50%; background: var(--navy); color: #fff; font-size: 20px; font-family: Arial, sans-serif; position: relative; z-index: 1; }
.flow li::after { content: ""; position: absolute; top: 32px; left: 50%; width: 100%; height: 2px; background: #cdd5e3; }
.flow li:last-child::after { display: none; }
.flow h3 { font-size: 17px; margin-bottom: 6px; }
.flow p { font-size: 13px; }
.flow-wrap { padding: 0; margin: 0; }

/* 联系条 */
.cta { background: var(--navy) url("../assets/spray-line.jpg") center / cover; position: relative; color: #fff; }
.cta::before { content: ""; position: absolute; inset: 0; background: rgba(18,40,90,.9); }
.cta .wrap { position: relative; display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 50px 0; flex-wrap: wrap; }
.cta h2 { color: #fff; font-size: 26px; margin-bottom: 6px; }
.cta p { color: #c9d4ea; margin: 0; }
.cta .tel { font-size: 30px; font-family: Arial, sans-serif; font-weight: 700; color: #fff; }

/* 内页正文 */
.article p { font-size: 16px; text-indent: 2em; line-height: 2; }
.split { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: start; }
.split.rev { grid-template-columns: .9fr 1.1fr; }

.profile-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-top: 18px;
  background: var(--line);
  border: 1px solid var(--line);
}
.profile-facts div {
  background: #fff;
  padding: 18px 16px;
  text-align: center;
}
.profile-facts strong {
  display: block;
  font-size: 22px;
  color: var(--navy);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  line-height: 1.3;
}
.profile-facts span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: #888;
}

.culture { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.culture div { background: #fff; border: 1px solid var(--line); padding: 32px 24px; text-align: center; }
.culture h3 { font-size: 18px; color: var(--navy); margin-bottom: 12px; }
.culture p { margin: 0; color: var(--ink); }

.org { text-align: center; }
.org .lv { display: inline-block; padding: 10px 34px; background: var(--navy); color: #fff; margin-bottom: 10px; }
.org .lv.sub { background: #3d5b9a; }
.org .depts { display: grid; grid-template-columns: repeat(9, 1fr); gap: 10px; margin-top: 18px; padding-top: 18px; border-top: 2px solid #cdd5e3; }
.org .depts span {
  position: relative;
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  margin: 0 auto;
  height: 132px;
  width: 46px;
}
.org .depts span i {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-style: normal;
  writing-mode: vertical-rl;
  letter-spacing: 4px;
  line-height: 1;
  white-space: nowrap;
}

table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { border: 1px solid var(--line); padding: 13px 18px; text-align: left; vertical-align: top; }
thead th { background: var(--navy); color: #fff; font-weight: 600; border-color: var(--navy); }
tbody th { background: var(--gray); width: 30%; font-weight: 600; color: var(--ink); }
tbody tr:hover td { background: #fafbfd; }

.craft { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.craft div { background: #fff; border: 1px solid var(--line); padding: 26px 24px; }
.craft h3 { font-size: 18px; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.craft h3::before { content: ""; width: 8px; height: 8px; background: var(--red); }
.craft p { margin: 0; font-size: 14px; }

.qc { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.qc div { background: #fff; padding: 28px; border-left: 4px solid var(--navy); }
.qc b { color: var(--red); font-family: Arial, sans-serif; font-size: 22px; display: block; }
.qc h3 { font-size: 17px; margin: 4px 0 8px; }
.qc p { margin: 0; font-size: 14px; }

.device { background: #fff; border: 1px solid var(--line); text-align: center; }
.device .pic { aspect-ratio: 4 / 3; background: #f1f2f4; overflow: hidden; }
.device img { width: 100%; height: 100%; object-fit: cover; }
.device h3 { font-size: 15px; font-weight: 600; padding: 12px 8px; }

.faq details { border-bottom: 1px solid var(--line); background: #fff; }
.faq summary { cursor: pointer; padding: 18px 20px; font-size: 16px; font-weight: 600; list-style: none; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "Q"; color: #fff; background: var(--navy); display: inline-grid; place-items: center; width: 24px; height: 24px; margin-right: 12px; font-size: 13px; font-family: Arial, sans-serif; }
.faq summary::after { content: "+"; position: absolute; right: 20px; color: #999; font-size: 20px; }
.faq details[open] summary::after { content: "−"; }
.faq details p { padding: 0 20px 16px 56px; margin: 0; }

.contact-box { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 40px; }
.contact-box div { background: var(--gray); padding: 32px 26px; text-align: center; }
.contact-box h3 { font-size: 17px; margin-bottom: 10px; color: var(--navy); }
.contact-box p { margin: 0; color: var(--ink); }
.contact-box a { display: block; font-size: 17px; font-family: Arial, sans-serif; }
.map-link { display: inline-block; margin-top: 14px; color: var(--navy); font-size: 14px; }

/* 底部 */
.site-footer { background: #10203f; color: #9fadc6; font-size: 14px; }
.site-footer .cols { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 40px; padding: 52px 0 36px; }
.site-footer h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.site-footer p { color: #9fadc6; margin: 0 0 6px; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; padding: 0; margin: 0; columns: 2; }
.site-footer li { margin-bottom: 6px; }
.copy { border-top: 1px solid rgba(255,255,255,.08); padding: 16px 0; font-size: 13px; color: #74839f; text-align: center; }

@media (max-width: 1000px) {
  .hotline { display: none; }
  .nav a { padding: 28px 10px; font-size: 15px; }
}
@media (max-width: 860px) {
  .topbar { display: none; }
  .site-header .wrap { min-height: 64px; gap: 10px; }
  .logo { font-size: 24px; }
  .brand { gap: 8px; }
  .brand-name strong { font-size: 15px; letter-spacing: 0; }
  .brand-name small { display: none; }
  .nav-btn { display: inline-block; }
  .nav { display: none; flex-basis: 100%; flex-direction: column; padding-bottom: 10px; }
  .nav a { padding: 10px 4px; border-top: 1px solid var(--line); }
  .nav a::after { display: none; }
  .nav-toggle:checked ~ .nav { display: flex; }
  .banner { min-height: 420px; }
  .banner h1 { font-size: 30px; }
  .section { padding: 50px 0; }
  .intro, .split, .split.rev, .grid-2, .grid-3, .grid-4, .adv, .culture, .craft, .qc, .contact-box, .site-footer .cols { grid-template-columns: 1fr; gap: 20px; }
  .grid-4.devices { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stats div:nth-child(2) { border-right: 0; }
  .photo-grid { grid-template-columns: 1fr 1fr; grid-template-rows: 240px 160px 160px; }
  .photo-grid .big { grid-column: span 2; grid-row: auto; }
  .flow { grid-template-columns: 1fr; gap: 20px; }
  .flow li::after { display: none; }
  .org .depts { grid-template-columns: repeat(3, 1fr); }
  .org .depts span { height: 48px; width: auto; min-width: 96px; }
  .org .depts span i { writing-mode: horizontal-tb; letter-spacing: 1px; }
  .page-banner { height: 170px; }
  .page-banner h1 { font-size: 26px; }
}