/* 青岛永冠保温建材有限公司 · 站点设计系统 */
:root {
  --primary: #0b4a6f;
  --primary-d: #07354e;
  --primary-l: #1a6d99;
  --accent: #e39b1f;
  --accent-d: #c5820f;
  --lime: #9dbb2f;
  --ink: #12212b;
  --text: #45565f;
  --muted: #74858e;
  --line: #dde6eb;
  --bg: #ffffff;
  --bg-alt: #f3f7f9;
  --bg-deep: #0a2231;
  --shadow-s: 0 2px 10px rgba(11, 74, 111, .07);
  --shadow-m: 0 10px 30px rgba(11, 74, 111, .10);
  --shadow-l: 0 18px 50px rgba(11, 74, 111, .16);
  --r-s: 4px;
  --r-m: 8px;
  --r-l: 14px;
  --maxw: 1240px;
  --head-h: 78px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --font: "Segoe UI", system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

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

img, video, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0; color: var(--ink); font-weight: 700; line-height: 1.3; letter-spacing: .01em; }
p { margin: 0 0 1em; }
table { border-collapse: collapse; width: 100%; }
button { font: inherit; cursor: pointer; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--primary); color: #fff; padding: 10px 18px;
}
.skip:focus { left: 12px; top: 12px; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ── 通用排版元件 ───────────────────────────── */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 700; letter-spacing: .22em; text-transform: uppercase;
  color: var(--accent-d); margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 30px; height: 2px; background: var(--accent); }
.sec-title { font-size: clamp(24px, 3.2vw, 34px); }
.sec-title .lt { display: block; font-size: 13px; font-weight: 600; letter-spacing: .2em; color: var(--muted); text-transform: uppercase; margin-top: 8px; }
.sec-head { max-width: 760px; margin-bottom: 44px; }
.sec-head p { margin: 16px 0 0; color: var(--muted); font-size: 16.5px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head.center .eyebrow { justify-content: center; }
.sec-head.center .eyebrow::after { content: ""; width: 30px; height: 2px; background: var(--accent); }
.lead { font-size: 17.5px; line-height: 1.9; color: var(--text); }
.muted { color: var(--muted); }

section { padding: 82px 0; }
section.alt { background: var(--bg-alt); }
section.tint { position: relative; background: var(--bg-deep); color: #cfe0ea; }
section.tint h2, section.tint h3 { color: #fff; }

/* ── 按钮 ───────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 27px; border-radius: var(--r-s);
  font-size: 15px; font-weight: 600; letter-spacing: .04em;
  border: 1px solid transparent; transition: all .25s var(--ease);
}
.btn .ar { transition: transform .25s var(--ease); }
.btn:hover .ar { transform: translateX(4px); }
.btn-p { background: var(--primary); color: #fff; }
.btn-p:hover { background: var(--primary-d); box-shadow: var(--shadow-m); }
.btn-a { background: var(--accent); color: #291a00; }
.btn-a:hover { background: var(--accent-d); color: #fff; box-shadow: var(--shadow-m); }
.btn-o { border-color: rgba(255, 255, 255, .45); color: #fff; }
.btn-o:hover { border-color: #fff; background: rgba(255, 255, 255, .12); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.tlink {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 14.5px; font-weight: 600; letter-spacing: .06em; color: var(--primary);
  padding-bottom: 3px; border-bottom: 2px solid transparent; transition: .25s var(--ease);
}
.tlink:hover { border-bottom-color: var(--accent); color: var(--primary-d); }

/* ── 顶栏 ───────────────────────────────────── */
.topbar { background: var(--bg-deep); color: #a9c3d2; font-size: 13.5px; }
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 40px; gap: 20px; }
.topbar ul { display: flex; align-items: center; gap: 22px; }
.topbar a:hover { color: #fff; }
.topbar .tel { color: #fff; font-weight: 700; letter-spacing: .03em; }
.topbar .sep { width: 1px; height: 14px; background: rgba(255, 255, 255, .18); }
.topbar .demo-tag { color: var(--accent); font-weight: 600; letter-spacing: .05em; }

/* ── 语言切换 / language switcher ───────────── */
.topbar .langsw a {
  display: inline-block; border: 1px solid rgba(255, 255, 255, .28); border-radius: 999px;
  padding: 3px 13px; font-size: 12.5px; font-weight: 600; color: #fff; letter-spacing: .04em; transition: .25s var(--ease);
}
.topbar .langsw a:hover { background: var(--accent); border-color: var(--accent); color: #291a00; }

/* Latin-script pages: longer labels need tighter type */
html[lang="en"] .menu > li > a, html[lang="vi"] .menu > li > a { font-size: 14.5px; letter-spacing: 0; padding: 11px 13px; }
html[lang="en"] .brand b, html[lang="vi"] .brand b { font-size: 19px; letter-spacing: .01em; }
html[lang="en"] .nav-cta, html[lang="vi"] .nav-cta { padding: 11px 18px; font-size: 14px; }
html[lang="en"] .sub a, html[lang="vi"] .sub a { white-space: normal; font-size: 13.5px; }
html[lang="en"] .sub, html[lang="vi"] .sub { min-width: 272px; }
html[lang="en"] .topbar ul, html[lang="vi"] .topbar ul { gap: 16px; }
html[lang="en"] .topbar, html[lang="vi"] .topbar { font-size: 12.5px; }

/* ── 主导航 ─────────────────────────────────── */
.site-head { position: sticky; top: 0; z-index: 100; background: #fff; border-bottom: 1px solid var(--line); transition: box-shadow .3s var(--ease); }
.site-head.stuck { box-shadow: 0 6px 24px rgba(11, 74, 111, .12); }
.nav-bar { display: flex; align-items: center; justify-content: space-between; height: var(--head-h); gap: 24px; }
.brand { display: flex; align-items: center; gap: 13px; flex: 0 0 auto; }
.brand svg { width: 44px; height: 44px; flex: 0 0 auto; }
.brand b { display: block; font-size: 21px; letter-spacing: .06em; color: var(--ink); line-height: 1.2; }
.brand span { display: block; font-size: 10.5px; letter-spacing: .16em; color: var(--muted); text-transform: uppercase; margin-top: 2px; }
.menu { display: flex; align-items: center; gap: 4px; }
.menu > li { position: relative; }
.menu > li > a {
  display: block; padding: 0 17px; line-height: var(--head-h);
  font-size: 15.5px; font-weight: 600; color: #2b3d47; position: relative;
}
.menu > li > a::after {
  content: ""; position: absolute; left: 17px; right: 17px; bottom: 20px; height: 2px;
  background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease);
}
.menu > li > a:hover { color: var(--primary); }
.menu > li > a:hover::after, .menu > li > a.is-active::after { transform: scaleX(1); }
.menu > li > a.is-active { color: var(--primary); }
.sub {
  position: absolute; top: 100%; left: 0; min-width: 232px; background: #fff;
  border: 1px solid var(--line); border-top: 3px solid var(--accent); box-shadow: var(--shadow-l);
  opacity: 0; visibility: hidden; transform: translateY(10px); transition: .25s var(--ease);
}
.menu > li:hover .sub, .menu > li:focus-within .sub { opacity: 1; visibility: visible; transform: translateY(0); }
.sub a { display: block; padding: 13px 20px; font-size: 14.5px; border-bottom: 1px solid #eef3f6; color: #34474f; }
.sub a:last-child { border-bottom: 0; }
.sub a:hover { background: var(--bg-alt); color: var(--primary); padding-left: 25px; }
.nav-cta { display: inline-flex; padding: 11px 22px; font-size: 14.5px; }
.burger { display: none; width: 46px; height: 40px; background: none; border: 1px solid var(--line); border-radius: var(--r-s); padding: 11px 12px; }
.burger i { display: block; height: 2px; background: var(--ink); margin-bottom: 5px; transition: .25s var(--ease); }
.burger i:last-child { margin-bottom: 0; }
.burger[aria-expanded="true"] i:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger[aria-expanded="true"] i:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] i:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── 首页轮播 ───────────────────────────────── */
.hero { position: relative; background: var(--bg-deep); color: #fff; overflow: hidden; }
.hero-slide { position: relative; height: min(78vh, 660px); min-height: 480px; display: none; }
.hero-slide.on { display: block; }
.hero-slide .bgimg { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: .62; }
.hero-slide.on .bgimg { animation: kb 12s linear forwards; }
@keyframes kb { from { transform: scale(1.02); } to { transform: scale(1.13); } }
.hero-slide::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(96deg, rgba(6, 33, 48, .93) 0%, rgba(7, 45, 66, .74) 45%, rgba(7, 45, 66, .28) 100%);
}
.hero-inner { position: relative; z-index: 2; padding: 76px 0 108px; max-width: 720px; }
.hero-kicker { display: inline-flex; align-items: center; gap: 12px; font-size: 13px; letter-spacing: .24em; text-transform: uppercase; color: var(--accent); font-weight: 700; }
.hero-kicker::after { content: ""; width: 46px; height: 1px; background: var(--accent); }
.hero h1 { color: #fff; font-size: clamp(30px, 4.6vw, 52px); line-height: 1.22; margin: 20px 0 18px; letter-spacing: .02em; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p { font-size: 17px; color: #d7e6ef; max-width: 560px; margin-bottom: 34px; }
.hero-acts { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-nav { position: absolute; z-index: 5; right: 24px; bottom: 130px; display: flex; gap: 10px; }
.hero-nav button { width: 46px; height: 46px; border-radius: 50%; border: 1px solid rgba(255, 255, 255, .4); background: rgba(255, 255, 255, .06); color: #fff; font-size: 17px; transition: .25s var(--ease); }
.hero-nav button:hover { background: var(--accent); border-color: var(--accent); color: #291a00; }
.hero-dots { position: absolute; z-index: 5; left: 24px; bottom: 138px; display: flex; gap: 12px; }
.hero-dots button { width: 34px; height: 3px; border: 0; padding: 0; background: rgba(255, 255, 255, .32); }
.hero-dots button[aria-current="true"] { background: var(--accent); }
.hero-strip { position: absolute; z-index: 4; left: 0; right: 0; bottom: 0; background: rgba(255, 255, 255, .97); color: var(--ink); box-shadow: 0 -12px 40px rgba(6, 33, 48, .18); }
.hero-strip .wrap { display: grid; grid-template-columns: repeat(4, 1fr); }
.kpi { padding: 26px 20px; border-left: 1px solid var(--line); }
.kpi:first-child { border-left: 0; }
.kpi b { display: block; font-size: clamp(26px, 3vw, 38px); font-weight: 800; color: var(--primary); line-height: 1.1; font-variant-numeric: tabular-nums; }
.kpi b i { font-style: normal; font-size: .55em; color: var(--accent); margin-left: 2px; }
.kpi span { display: block; font-size: 13.5px; color: var(--muted); margin-top: 6px; letter-spacing: .04em; }

/* ── 内页横幅 ───────────────────────────────── */
.pageband { position: relative; padding: 74px 0; background: var(--bg-deep); color: #fff; overflow: hidden; }
.pageband .bg { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: .34; }
.pageband::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7, 45, 66, .92), rgba(10, 34, 49, .6)); }
.pageband .wrap { position: relative; z-index: 2; }
.pageband h1 { color: #fff; font-size: clamp(26px, 3.6vw, 40px); }
.pageband p { color: #c6dbe7; margin: 12px 0 0; max-width: 640px; }
.crumbs { position: relative; z-index: 2; font-size: 13.5px; color: #9dbccd; margin-bottom: 16px; }
.crumbs a:hover { color: #fff; }
.crumbs i { font-style: normal; margin: 0 8px; color: #5d8299; }

/* ── 关于 ───────────────────────────────────── */
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.split.rev { grid-template-columns: 1fr 1.05fr; }
.split .txt h2 { margin-bottom: 6px; }
.split .txt p { margin-top: 18px; }
.fig { position: relative; }
.fig img { width: 100%; border-radius: var(--r-m); box-shadow: var(--shadow-m); }
.fig .tag {
  position: absolute; left: -22px; bottom: -22px; background: var(--primary); color: #fff;
  padding: 18px 24px; border-radius: var(--r-m); box-shadow: var(--shadow-l); border-bottom: 4px solid var(--accent);
}
.fig .tag b { display: block; font-size: 30px; font-weight: 800; line-height: 1; font-variant-numeric: tabular-nums; }
.fig .tag span { font-size: 13px; color: #b9d4e2; letter-spacing: .06em; }
.fig.stack2 img:last-child { margin-top: 18px; }
.factgrid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 30px; }
.factgrid div { background: #fff; padding: 18px 20px; }
.factgrid dt { font-size: 13px; color: var(--muted); letter-spacing: .05em; }
.factgrid dd { margin: 4px 0 0; font-size: 17px; font-weight: 700; color: var(--ink); }

.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.pillar { background: #fff; border: 1px solid var(--line); border-top: 3px solid transparent; padding: 32px 28px; border-radius: var(--r-m); transition: .3s var(--ease); }
.pillar:hover { border-top-color: var(--accent); box-shadow: var(--shadow-m); transform: translateY(-4px); }
.pillar h3 { font-size: 18.5px; margin: 18px 0 10px; }
.pillar p { margin: 0; font-size: 15px; color: var(--muted); }
.ico { width: 52px; height: 52px; border-radius: var(--r-m); background: #eaf2f7; display: grid; place-items: center; color: var(--primary); }
.ico svg { width: 26px; height: 26px; }

/* ── 产品卡 ─────────────────────────────────── */
.prods { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.prods.two { grid-template-columns: repeat(2, 1fr); }
.prod { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--r-m); overflow: hidden; transition: .3s var(--ease); display: block; }
.prod:hover { box-shadow: var(--shadow-l); transform: translateY(-5px); }
.prod .ph { position: relative; aspect-ratio: 4 / 3; overflow: hidden; background: #e7eef2; }
.prod .ph img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
.prod:hover .ph img { transform: scale(1.07); }
.prod .no { position: absolute; top: 0; left: 0; background: rgba(10, 34, 49, .82); color: #fff; font-size: 13px; font-weight: 700; letter-spacing: .1em; padding: 7px 14px; border-bottom-right-radius: var(--r-m); }
.prod .bd { padding: 22px 24px 26px; }
.prod h3 { font-size: 19px; }
.prod .en { font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin: 5px 0 10px; }
.prod p { font-size: 14.5px; color: var(--muted); margin: 0 0 16px; min-height: 3em; }
.prod .more { display: flex; align-items: center; justify-content: space-between; font-size: 14px; font-weight: 600; color: var(--primary); }
.prod .more .ar { transition: transform .3s var(--ease); }
.prod:hover .more .ar { transform: translateX(5px); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 12.5px; letter-spacing: .04em; padding: 4px 11px; border-radius: 999px; background: #eef4f7; color: var(--primary); border: 1px solid #dfeaf0; }
.chip.hot { background: #fdf3e0; color: var(--accent-d); border-color: #f5e0b6; }

/* ── 参数表 ─────────────────────────────────── */
.tbl-wrap { border: 1px solid var(--line); border-radius: var(--r-m); overflow: hidden; box-shadow: var(--shadow-s); background: #fff; }
table.spec { font-size: 15px; }
table.spec caption { text-align: left; padding: 18px 22px; background: var(--primary); color: #fff; font-weight: 700; font-size: 16px; letter-spacing: .04em; }
table.spec th, table.spec td { padding: 13px 20px; border-bottom: 1px solid #e9eff3; text-align: left; vertical-align: top; }
table.spec thead th { background: #f4f8fa; color: var(--ink); font-size: 14px; letter-spacing: .05em; border-bottom: 2px solid var(--line); }
table.spec tbody tr:nth-child(even) { background: #fafcfd; }
table.spec tbody tr:hover { background: #f0f6fa; }
table.spec td.num { font-variant-numeric: tabular-nums; color: var(--primary); font-weight: 600; white-space: nowrap; }
table.spec tbody tr:last-child th, table.spec tbody tr:last-child td { border-bottom: 0; }
.tbl-note { font-size: 13px; color: var(--muted); margin-top: 12px; }

/* ── 工艺流程 ───────────────────────────────── */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.flow li { position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--r-m); padding: 22px 20px 20px; }
.flow li::before {
  counter-increment: step; content: "0" counter(step);
  display: block; font-size: 13px; font-weight: 800; letter-spacing: .1em; color: var(--accent); margin-bottom: 8px;
}
.flow li::after { content: ""; position: absolute; right: -12px; top: 50%; width: 0; height: 0; border: 6px solid transparent; border-left-color: var(--line); }
.flow li:last-child::after { display: none; }
.flow h4 { font-size: 16px; margin-bottom: 6px; }
.flow p { font-size: 13.5px; color: var(--muted); margin: 0; }

/* ── 应用 / 案例 ────────────────────────────── */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.case { position: relative; border-radius: var(--r-m); overflow: hidden; aspect-ratio: 4 / 3; background: #0a2231; }
.case img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .88; transition: .5s var(--ease); }
.case:hover img { transform: scale(1.08); opacity: .6; }
.case .cap { position: absolute; inset: auto 0 0 0; z-index: 2; padding: 22px 22px 20px; background: linear-gradient(transparent, rgba(6, 28, 41, .92)); color: #fff; }
.case .cap h3 { color: #fff; font-size: 18px; }
.case .cap p { margin: 6px 0 0; font-size: 13.5px; color: #bcd6e4; }
.case .cap .idx { font-size: 12px; letter-spacing: .16em; color: var(--accent); font-weight: 700; }

.clients { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.clients div { background: #fff; border: 1px solid var(--line); border-radius: var(--r-s); padding: 22px 16px; text-align: center; font-weight: 600; color: #33474f; letter-spacing: .04em; transition: .25s var(--ease); }
.clients div:hover { border-color: var(--primary); color: var(--primary); box-shadow: var(--shadow-s); }
.clients div small { display: block; font-size: 12px; font-weight: 400; color: var(--muted); letter-spacing: .02em; margin-top: 4px; }

/* ── 资质 ───────────────────────────────────── */
.certs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.cert { background: #fff; border: 1px solid var(--line); border-radius: var(--r-m); overflow: hidden; display: flex; flex-direction: column; transition: .3s var(--ease); }
.cert:hover { box-shadow: var(--shadow-l); transform: translateY(-4px); }
.cert .top { padding: 26px 24px; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-d) 100%); color: #fff; border-bottom: 4px solid var(--accent); }
.cert .top span { font-size: 12px; letter-spacing: .16em; color: #a8cadf; text-transform: uppercase; }
.cert .top h3 { color: #fff; font-size: 19px; margin-top: 6px; }
.cert .bd { padding: 22px 24px 26px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.cert .bd dl { display: grid; grid-template-columns: 84px 1fr; gap: 6px 12px; font-size: 14px; margin: 0; }
.cert .bd dt { color: var(--muted); }
.cert .bd dd { margin: 0; color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
.cert .dl { margin-top: auto; display: flex; gap: 10px; flex-wrap: wrap; }
.cert .dl a { font-size: 13.5px; font-weight: 600; color: var(--primary); border: 1px solid var(--line); border-radius: var(--r-s); padding: 8px 14px; transition: .25s var(--ease); }
.cert .dl a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ── 新闻 ───────────────────────────────────── */
.news { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px 40px; }
.nitem { display: grid; grid-template-columns: 92px 1fr; gap: 20px; padding-bottom: 26px; border-bottom: 1px dashed var(--line); }
.nitem .date { background: var(--bg-alt); border: 1px solid var(--line); border-radius: var(--r-s); text-align: center; padding: 12px 6px; align-self: start; }
.nitem .date b { display: block; font-size: 26px; font-weight: 800; color: var(--primary); line-height: 1; font-variant-numeric: tabular-nums; }
.nitem .date span { display: block; font-size: 12px; color: var(--muted); margin-top: 5px; }
.nitem h3 { font-size: 18px; }
.nitem .cat { font-size: 12px; letter-spacing: .1em; color: var(--accent-d); font-weight: 700; margin-bottom: 6px; }
.nitem p { font-size: 15px; color: var(--muted); margin: 8px 0 10px; }

.tabs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 34px; }
.tabs button { border: 1px solid var(--line); background: #fff; color: var(--text); padding: 10px 22px; border-radius: 999px; font-size: 14.5px; font-weight: 600; transition: .25s var(--ease); }
.tabs button[aria-selected="true"] { background: var(--primary); border-color: var(--primary); color: #fff; }
.tabs button:hover { border-color: var(--primary); color: var(--primary); }
.tabs button[aria-selected="true"]:hover { color: #fff; }

/* ── 折叠 ───────────────────────────────────── */
.acc { border: 1px solid var(--line); border-radius: var(--r-m); overflow: hidden; background: #fff; }
.acc + .acc { margin-top: 14px; }
.acc summary { list-style: none; cursor: pointer; padding: 19px 24px; font-weight: 700; color: var(--ink); display: flex; align-items: center; justify-content: space-between; gap: 16px; font-size: 16px; }
.acc summary::-webkit-details-marker { display: none; }
.acc summary::after { content: "+"; font-size: 22px; color: var(--accent); font-weight: 400; transition: transform .25s var(--ease); line-height: 1; }
.acc[open] summary::after { transform: rotate(45deg); }
.acc[open] summary { background: var(--bg-alt); }
.acc .in { padding: 20px 24px 24px; border-top: 1px solid var(--line); font-size: 15.5px; }
.acc .in p:last-child { margin-bottom: 0; }

/* ── 列表通用 ───────────────────────────────── */
.tick li { position: relative; padding-left: 30px; margin-bottom: 13px; font-size: 15.5px; }
.tick li::before { content: ""; position: absolute; left: 0; top: 9px; width: 16px; height: 9px; border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(-45deg); }
.num-list li { counter-increment: li; position: relative; padding-left: 46px; margin-bottom: 18px; }
.num-list { counter-reset: li; }
.num-list li::before { content: counter(li, decimal-leading-zero); position: absolute; left: 0; top: 2px; font-size: 15px; font-weight: 800; color: var(--accent); }
.num-list b { color: var(--ink); }

/* ── 视频 / 图集 ────────────────────────────── */
.shots { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 172px; gap: 14px; }
.shots img { width: 100%; height: 100%; object-fit: cover; border-radius: var(--r-s); transition: .35s var(--ease); }
.shots img:hover { transform: scale(1.02); box-shadow: var(--shadow-m); }
.shots .w2 { grid-column: span 2; }
.shots .r2 { grid-row: span 2; }
.vids { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.vid { background: #000; border-radius: var(--r-m); overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-m); }
.vid video { width: 100%; aspect-ratio: 16 / 9; background: #000; }
.vid .cap { background: #fff; padding: 14px 18px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.vid .cap b { font-size: 15.5px; color: var(--ink); }
.vid .cap span { font-size: 13px; color: var(--muted); }

/* ── 时间轴 ─────────────────────────────────── */
.timeline { position: relative; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--accent), var(--line)); }
.timeline li { position: relative; padding-bottom: 30px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before { content: ""; position: absolute; left: -33px; top: 6px; width: 16px; height: 16px; border-radius: 50%; background: #fff; border: 3px solid var(--accent); box-shadow: 0 0 0 4px rgba(227, 155, 31, .15); }
.timeline b { display: block; font-size: 15px; color: var(--primary); letter-spacing: .06em; font-variant-numeric: tabular-nums; }
.timeline p { margin: 4px 0 0; font-size: 15px; color: var(--text); }

/* ── 联系 ───────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.cbox { background: #fff; border: 1px solid var(--line); border-radius: var(--r-m); padding: 30px 32px; box-shadow: var(--shadow-s); }
.cbox h3 { font-size: 19px; margin-bottom: 20px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.cbox dl { display: grid; grid-template-columns: 108px 1fr; gap: 16px 14px; margin: 0; font-size: 15.5px; }
.cbox dt { color: var(--muted); display: flex; align-items: center; gap: 8px; }
.cbox dt svg { width: 16px; height: 16px; color: var(--primary); flex: 0 0 auto; }
.cbox dd { margin: 0; color: var(--ink); }
.cbox dd a:hover { color: var(--primary); }
.map-ph { border-radius: var(--r-m); overflow: hidden; border: 1px solid var(--line); background: var(--bg-alt); min-height: 300px; display: grid; place-items: center; text-align: center; padding: 24px; }
.map-ph b { display: block; color: var(--ink); font-size: 17px; margin-bottom: 6px; }
.map-ph span { font-size: 14px; color: var(--muted); }

/* ── CTA 带 ─────────────────────────────────── */
.cta { position: relative; background: var(--primary-d); color: #fff; padding: 66px 0; overflow: hidden; }
.cta::before {
  content: ""; position: absolute; inset: 0; opacity: .5;
  background: radial-gradient(600px 240px at 88% 20%, rgba(227, 155, 31, .28), transparent 70%), repeating-linear-gradient(115deg, rgba(255, 255, 255, .045) 0 2px, transparent 2px 22px);
}
.cta .wrap { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 34px; flex-wrap: wrap; }
.cta h2 { color: #fff; font-size: clamp(22px, 2.8vw, 31px); margin-bottom: 10px; }
.cta p { margin: 0; color: #bcd8e7; max-width: 620px; }
.cta .acts { display: flex; gap: 14px; flex-wrap: wrap; }

/* ── 页脚 ───────────────────────────────────── */
footer { background: var(--bg-deep); color: #93b2c2; font-size: 14.5px; }
.foot-main { padding: 62px 0 44px; display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.35fr; gap: 40px; }
.foot-brand svg { width: 46px; height: 46px; }
.foot-brand .row { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.foot-brand b { color: #fff; font-size: 19px; letter-spacing: .06em; }
.foot-brand p { margin: 0 0 18px; line-height: 1.85; }
.foot-mini { display: flex; gap: 22px; flex-wrap: wrap; }
.foot-mini div { border-left: 2px solid var(--accent); padding-left: 11px; }
.foot-mini b { display: block; color: #fff; font-size: 19px; font-variant-numeric: tabular-nums; }
.foot-mini span { font-size: 12.5px; color: #7fa1b4; }
footer h4 { color: #fff; font-size: 15.5px; letter-spacing: .1em; margin-bottom: 20px; text-transform: uppercase; }
footer nav a { display: block; padding: 6px 0; color: #93b2c2; transition: .2s var(--ease); }
footer nav a:hover { color: #fff; padding-left: 6px; }
.foot-contact li { display: flex; gap: 10px; margin-bottom: 14px; line-height: 1.7; }
.foot-contact svg { width: 17px; height: 17px; flex: 0 0 auto; margin-top: 4px; color: var(--accent); }
.foot-contact a:hover { color: #fff; }
.foot-bot { border-top: 1px solid rgba(255, 255, 255, .1); padding: 20px 0; display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; font-size: 13.5px; color: #7fa1b4; }
.foot-bot .demo { color: var(--accent); }
.foot-bot nav { display: flex; gap: 18px; }
.foot-bot nav a:hover { color: #fff; }

.top-btn { position: fixed; right: 22px; bottom: 26px; z-index: 90; width: 46px; height: 46px; border: 0; border-radius: 50%; background: var(--primary); color: #fff; box-shadow: var(--shadow-l); opacity: 0; visibility: hidden; transform: translateY(14px); transition: .3s var(--ease); }
.top-btn.on { opacity: 1; visibility: visible; transform: none; }
.top-btn:hover { background: var(--accent); color: #291a00; }

/* ── 引文 · 提示 · 构造层 ─────────────────────── */
.quote { position: relative; margin: 34px 0; padding: 26px 30px 24px; background: var(--bg-alt); border-left: 4px solid var(--accent); border-radius: 0 var(--r-m) var(--r-m) 0; }
.quote p { margin: 0; font-size: 21px; font-weight: 700; line-height: 1.6; color: var(--primary); letter-spacing: .02em; }
.quote cite { display: block; margin-top: 12px; font-size: 14px; font-style: normal; color: var(--muted); }

.note { padding: 18px 22px; background: #fdf7e9; border: 1px solid #eddbb3; border-left: 4px solid var(--accent); border-radius: var(--r-s); font-size: 15px; line-height: 1.75; color: #6b5426; }
.note b { color: var(--accent-d); }
.tint .note { box-shadow: var(--shadow-m); }

.layers { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.layers li { display: grid; grid-template-columns: 42px 1fr; gap: 16px; align-items: center; background: #fff; border: 1px solid var(--line); border-radius: var(--r-s); padding: 14px 18px; box-shadow: var(--shadow-s); }
.layers .ln { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 16px; font-weight: 800; font-variant-numeric: tabular-nums; }
.layers li b { display: block; font-size: 16.5px; color: var(--ink); }
.layers li p { margin: 3px 0 0; font-size: 14px; color: var(--muted); }
.layers li:nth-child(odd) .ln { background: var(--primary-l); }

/* ── 动效 ───────────────────────────────────── */
.js .rv { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .rv.in { opacity: 1; transform: none; }
.rv.d1 { transition-delay: .09s; } .rv.d2 { transition-delay: .18s; } .rv.d3 { transition-delay: .27s; }
.rv.d4 { transition-delay: .36s; } .rv.d5 { transition-delay: .45s; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .rv { opacity: 1; transform: none; transition: none; }
  .hero-slide.on .bgimg { animation: none; }
  .prod .ph img, .case img { transition: none; }
}

/* ── 响应式 ─────────────────────────────────── */
@media (max-width: 1080px) {
  .prods, .cases, .certs, .pillars { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .flow li::after { display: none; }
  .foot-main { grid-template-columns: 1fr 1fr; gap: 34px; }
  .clients { grid-template-columns: repeat(3, 1fr); }
  .shots { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 900px) {
  :root { --head-h: 66px; }
  .menu {
    position: fixed; inset: var(--head-h) 0 auto; background: #fff; flex-direction: column; align-items: stretch;
    gap: 0; max-height: calc(100vh - var(--head-h)); overflow-y: auto; padding: 8px 0 26px;
    transform: translateY(-120%); transition: transform .35s var(--ease); box-shadow: var(--shadow-l); border-top: 1px solid var(--line);
  }
  .menu.open { transform: none; }
  .menu > li > a { line-height: 1; padding: 16px 24px; border-bottom: 1px solid #eef3f6; }
  .menu > li > a::after { display: none; }
  .sub { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; border-top: 0; display: none; background: var(--bg-alt); min-width: 0; }
  .menu > li.open .sub { display: block; }
  .sub a { padding-left: 40px; border-bottom-color: #e4edf1; }
  .burger { display: block; }
  .nav-cta { display: none; }
  .topbar ul.hide-sm { display: none; }
  .split, .split.rev { grid-template-columns: 1fr; gap: 34px; }
  .hero-slide { height: auto; min-height: 0; }
  .hero-inner { padding: 54px 0 150px; }
  .hero-strip .wrap { grid-template-columns: repeat(2, 1fr); }
  .kpi { border-top: 1px solid var(--line); }
  .kpi:nth-child(-n+2) { border-top: 0; }
  .kpi:nth-child(odd) { border-left: 0; }
  .hero-dots { bottom: 118px; }
  .hero-nav { bottom: 112px; }
  .contact-grid, .vids, .news { grid-template-columns: 1fr; }
  section { padding: 60px 0; }
}
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .prods, .cases, .certs, .pillars, .clients, .flow, .vids, .shots { grid-template-columns: 1fr; }
  .clients { grid-template-columns: repeat(2, 1fr); }
  .shots { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 150px; }
  .shots .w2, .shots .r2 { grid-column: auto; grid-row: auto; }
  .foot-main { grid-template-columns: 1fr; }
  .fig .tag { left: 12px; bottom: 12px; padding: 13px 18px; }
  .fig .tag b { font-size: 24px; }
  .nitem { grid-template-columns: 74px 1fr; gap: 14px; }
  .factgrid { grid-template-columns: 1fr; }
  .cbox dl { grid-template-columns: 1fr; gap: 4px 0; }
  .cbox dl dd { margin-bottom: 10px; }
  .cta .wrap { flex-direction: column; align-items: flex-start; }
  .hero-acts .btn { flex: 1 1 auto; justify-content: center; }
  table.spec { font-size: 14px; }
  table.spec th, table.spec td { padding: 11px 13px; }
  .quote { padding: 20px 20px 18px; }
  .quote p { font-size: 18px; }
  .note { padding: 16px 18px; font-size: 14.5px; }
  .layers li { grid-template-columns: 34px 1fr; gap: 12px; padding: 12px 14px; }
  .layers .ln { width: 34px; height: 34px; font-size: 14px; }
  .layers li b { font-size: 15.5px; }
  .contact-grid { gap: 26px; }
  .cbox { padding: 24px 22px; }
}