/* ============================================================
   清源空调维修服务中心 · 全局样式
   ============================================================ */
@font-face {
  font-family: "Noto Sans SC";
  src: url("../fonts/notosanssc-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Noto Sans SC";
  src: url("../fonts/notosanssc-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Noto Sans SC";
  src: url("../fonts/notosanssc-700.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Noto Sans SC";
  src: url("../fonts/notosanssc-900.woff2") format("woff2");
  font-weight: 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --blue-950: #072C47;
  --blue-900: #0A3D63;
  --blue-800: #0B4E7E;
  --blue-700: #0B5FA5;
  --blue-600: #1275BF;
  --blue-500: #2E8BC0;
  --blue-100: #E3EFF8;
  --cyan-500: #38B2D8;
  --orange-500: #F5852B;
  --orange-600: #E06E12;
  --ink: #16283A;
  --muted: #5D7184;
  --line: #DDE7EF;
  --bg: #F5F8FB;
  --card: #FFFFFF;
  --radius: 14px;
  --shadow-sm: 0 2px 10px rgba(7, 44, 71, 0.08);
  --shadow-md: 0 10px 30px rgba(7, 44, 71, 0.12);
  --font: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--blue-700); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--orange-500); }
ul, ol { list-style-position: inside; }
:focus-visible { outline: 2px solid var(--orange-500); outline-offset: 2px; }

.skip-link {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link:focus {
  position: fixed; top: 12px; left: 12px; width: auto; height: auto;
  padding: 10px 16px; margin: 0; clip: auto; z-index: 200;
  background: var(--blue-900); color: #fff; border-radius: 8px;
}

.container { width: min(1160px, 92%); margin-inline: auto; }

/* ---------- 顶部信息条 ---------- */
.topbar { background: var(--blue-950); color: #C9DCEB; font-size: 13.5px; }
.topbar-inner {
  display: flex; justify-content: space-between; align-items: center;
  min-height: 38px; gap: 12px; flex-wrap: wrap;
}
.topbar a { color: #EAF4FC; }
.topbar .tb-hotline { color: #fff; font-weight: 700; letter-spacing: .02em; }
.topbar .tb-item { display: inline-flex; align-items: center; gap: 6px; }
.topbar svg { width: 14px; height: 14px; stroke: var(--cyan-500); flex: none; }
.tb-right { display: flex; gap: 18px; }

/* ---------- 页头导航 ---------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s ease;
}
.header.scrolled { box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; gap: 28px; min-height: 74px; }
.logo { display: flex; align-items: center; gap: 11px; color: var(--ink); }
.logo:hover { color: var(--ink); }
.logo-mark { width: 42px; height: 42px; flex: none; border-radius: 11px; box-shadow: var(--shadow-sm); }
.logo-text { font-size: 22px; font-weight: 900; line-height: 1.1; letter-spacing: .01em; }
.logo-text small { display: block; font-size: 12px; font-weight: 500; color: var(--muted); letter-spacing: .14em; margin-top: 2px; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  color: var(--ink); font-weight: 500; padding: 9px 15px; border-radius: 9px;
  font-size: 15.5px; position: relative;
}
.nav a:hover { color: var(--blue-700); background: var(--blue-100); }
.nav a.active { color: var(--blue-700); font-weight: 700; background: var(--blue-100); }
.header .btn { margin-left: 8px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 11px; font-weight: 700; font-size: 15.5px;
  border: 1px solid transparent; cursor: pointer; line-height: 1.2;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  font-family: var(--font);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--blue-700); color: #fff; box-shadow: 0 6px 18px rgba(11, 95, 165, .3); }
.btn-primary:hover { background: var(--blue-600); color: #fff; box-shadow: 0 8px 22px rgba(11, 95, 165, .38); }
.btn-phone { background: var(--orange-500); color: #fff; box-shadow: 0 6px 18px rgba(245, 133, 43, .32); }
.btn-phone:hover { background: var(--orange-600); color: #fff; }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }
.btn-ghost:hover { background: rgba(255,255,255,.12); color: #fff; }
.btn svg { width: 17px; height: 17px; flex: none; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; background: none; border: 0;
  padding: 10px; border-radius: 8px; cursor: pointer;
  min-width: 44px; min-height: 44px; align-items: center; justify-content: center;
}
.nav-toggle span { width: 24px; height: 2.6px; background: var(--blue-900); border-radius: 2px; transition: transform .25s ease, opacity .2s ease; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7.6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.6px) rotate(-45deg); }

/* ---------- 通用区块 ---------- */
.section { padding: 84px 0; }
.section.tight { padding: 56px 0; }
.section-alt { background: var(--card); }
.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head.center { margin-inline: auto; text-align: center; }
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--blue-700); font-weight: 700; font-size: 14px; letter-spacing: .12em;
  margin-bottom: 12px;
}
.kicker::before { content: ""; width: 22px; height: 3px; border-radius: 2px; background: var(--orange-500); }
.section-head.center .kicker::after { content: ""; width: 22px; height: 3px; border-radius: 2px; background: var(--orange-500); }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; text-wrap: balance; }
.section-title { font-size: 32px; font-weight: 900; color: var(--blue-950); margin-bottom: 14px; }
.section-sub { color: var(--muted); font-size: 16px; }

/* ---------- 首页 Hero ---------- */
.hero {
  position: relative; color: #fff;
  background:
    linear-gradient(100deg, rgba(7, 44, 71, .94) 0%, rgba(11, 78, 126, .78) 46%, rgba(11, 95, 165, .35) 100%),
    url("../images/hero.jpg") center 42% / cover no-repeat;
  padding: 118px 0 0;
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: end; }
.hero h1 {
  font-size: clamp(34px, 4.6vw, 56px); font-weight: 900; line-height: 1.18;
  letter-spacing: .01em; margin-bottom: 20px;
}
.hero h1 .hl { color: #7FD1F0; }
.hero p.lead { font-size: 18px; color: #DFECF6; max-width: 540px; margin-bottom: 32px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.hero-badges span {
  display: inline-flex; align-items: center; gap: 7px;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.22);
  padding: 7px 14px; border-radius: 999px; font-size: 13.5px; color: #EAF4FC;
}
.hero-badges svg { width: 15px; height: 15px; stroke: #7FD1F0; flex: none; }
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: var(--card); border-radius: 16px 16px 0 0; box-shadow: var(--shadow-md);
  color: var(--ink); margin-top: 70px;
}
.stat { padding: 30px 18px 26px; text-align: center; position: relative; }
.stat + .stat::before { content: ""; position: absolute; left: 0; top: 26%; bottom: 26%; width: 1px; background: var(--line); }
.stat b { display: block; font-size: 34px; font-weight: 900; color: var(--blue-700); line-height: 1.15; font-variant-numeric: tabular-nums; }
.stat b em { font-style: normal; font-size: 20px; }
.stat span { color: var(--muted); font-size: 14px; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-sm); transition: transform .22s ease, box-shadow .22s ease;
  overflow: hidden;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.service-card .card-media { position: relative; aspect-ratio: 3 / 2; overflow: hidden; }
.service-card .card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.service-card:hover .card-media img { transform: scale(1.05); }
.service-card .card-media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7,44,71,0) 55%, rgba(7,44,71,.55) 100%);
}
.service-card .price-tag {
  position: absolute; left: 16px; bottom: 14px; z-index: 2;
  background: var(--orange-500); color: #fff; font-size: 13px; font-weight: 700;
  padding: 5px 12px; border-radius: 999px; box-shadow: 0 4px 10px rgba(0,0,0,.25);
}
.service-card .card-body { padding: 22px 24px 26px; }
.service-card h3 { font-size: 20px; margin-bottom: 8px; color: var(--blue-950); }
.service-card h3 a { color: inherit; }
.service-card p { color: var(--muted); font-size: 14.5px; margin-bottom: 16px; }
.card-link { font-weight: 700; font-size: 14.5px; display: inline-flex; align-items: center; gap: 6px; padding: 6px 8px; margin: -6px -8px; }
.card-link svg { width: 15px; height: 15px; transition: transform .2s ease; }
.card-link:hover svg { transform: translateX(4px); }

.card-media { display: block; }

/* ---------- 特色 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.feature-card { padding: 30px 26px; }
.feature-card .f-icon {
  width: 52px; height: 52px; border-radius: 13px; display: grid; place-items: center;
  background: var(--blue-100); color: var(--blue-700); margin-bottom: 18px;
}
.feature-card .f-icon svg { width: 27px; height: 27px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; color: var(--blue-950); }
.feature-card p { color: var(--muted); font-size: 14px; }

/* ---------- 服务流程 ---------- */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
.process-step { position: relative; padding: 0 26px; text-align: center; }
.process-step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  display: grid; place-items: center;
  width: 56px; height: 56px; margin: 0 auto 16px; border-radius: 50%;
  background: var(--blue-700); color: #fff; font-weight: 900; font-size: 20px;
  box-shadow: 0 8px 20px rgba(11, 95, 165, .3); font-variant-numeric: tabular-nums;
}
.process-step:not(:first-child)::after {
  content: ""; position: absolute; top: 28px; left: calc(-50% + 28px); right: calc(50% + 28px);
  border-top: 2px dashed #B9CFE0;
}
.process-step h3 { font-size: 17px; margin-bottom: 6px; color: var(--blue-950); }
.process-step p { color: var(--muted); font-size: 14px; }

/* ---------- 价格表 ---------- */
.price-wrap { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); overflow: hidden; }
.price-table { width: 100%; border-collapse: collapse; table-layout: fixed; }
.price-table caption { text-align: left; padding: 20px 26px; font-weight: 900; font-size: 18px; color: var(--blue-950); background: var(--blue-100); }
.price-table th { background: var(--blue-900); color: #fff; font-weight: 700; font-size: 14.5px; padding: 13px 18px; text-align: left; }
.price-table td { padding: 15px 18px; font-size: 14.5px; border-bottom: 1px solid var(--line); }
.price-table tr:last-child td { border-bottom: 0; }
.price-table tbody tr:nth-child(even) td { background: #F8FBFD; }
.price-table .num { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--orange-600); }
.price-table .tag { display: inline-block; background: var(--blue-100); color: var(--blue-700); font-size: 12.5px; padding: 2px 9px; border-radius: 999px; margin-left: 8px; }
.price-note { margin-top: 14px; color: var(--muted); font-size: 13.5px; }
.price-note b { color: var(--ink); }

/* ---------- 资讯卡片 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.news-card .card-media { aspect-ratio: 3 / 2; overflow: hidden; }
.news-card .card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.news-card:hover .card-media img { transform: scale(1.05); }
.news-card .card-body { padding: 20px 24px 24px; }
.news-meta { display: flex; gap: 14px; color: var(--muted); font-size: 12.5px; margin-bottom: 10px; font-variant-numeric: tabular-nums; }
.news-meta .cat { color: var(--blue-700); font-weight: 700; }
.news-card h3 { font-size: 17.5px; line-height: 1.5; margin-bottom: 10px; }
.news-card h3 a { color: var(--blue-950); }
.news-card h3 a:hover { color: var(--blue-700); }
.news-card p { color: var(--muted); font-size: 13.5px; margin-bottom: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  background:
    linear-gradient(105deg, rgba(7, 44, 71, .95), rgba(11, 95, 165, .82)),
    url("../images/service-commercial.jpg") center / cover no-repeat;
  color: #fff; padding: 66px 0;
}
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-inner h2 { font-size: 28px; font-weight: 900; margin-bottom: 10px; }
.cta-inner p { color: #DFECF6; max-width: 620px; }
.cta-inner .btn-phone { font-size: 17px; padding: 15px 30px; }

/* ---------- 内页横幅 ---------- */
.page-hero {
  position: relative; color: #fff; padding: 84px 0 74px;
  background:
    linear-gradient(100deg, rgba(7, 44, 71, .93), rgba(11, 78, 126, .72) 55%, rgba(11, 95, 165, .45)),
    url("../images/hero.jpg") center 30% / cover no-repeat;
}
.page-hero h1 { font-size: clamp(28px, 3.6vw, 42px); font-weight: 900; margin-bottom: 12px; }
.page-hero p { color: #DFECF6; max-width: 640px; font-size: 16px; }
.crumbs { display: flex; gap: 8px; align-items: center; font-size: 13.5px; color: #BFD7EA; margin-top: 18px; }
.crumbs a { color: #DFECF6; }
.crumbs span { color: #7FD1F0; }

/* ---------- 关于页 ---------- */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: center; }
.about-intro .ai-media { position: relative; }
.about-intro .ai-media img { border-radius: var(--radius); box-shadow: var(--shadow-md); }
.ai-float {
  position: absolute; right: -18px; bottom: -22px; background: var(--card);
  border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-md);
  padding: 14px 20px; text-align: center;
}
.ai-float b { display: block; font-size: 26px; font-weight: 900; color: var(--orange-500); font-variant-numeric: tabular-nums; }
.ai-float span { font-size: 12.5px; color: var(--muted); }
.about-intro h2 { font-size: 27px; font-weight: 900; color: var(--blue-950); margin: 14px 0 16px; }
.about-intro p { color: var(--muted); margin-bottom: 14px; }
.about-intro .tick-list { list-style: none; margin: 18px 0 26px; display: grid; gap: 10px; }
.about-intro .tick-list li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; color: var(--ink); }
.about-intro .tick-list svg { width: 19px; height: 19px; flex: none; margin-top: 3px; color: var(--blue-700); }

.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.value-card { padding: 30px 28px; }
.value-card .v-no { font-size: 15px; font-weight: 900; color: var(--orange-500); font-variant-numeric: tabular-nums; letter-spacing: .08em; }
.value-card h3 { font-size: 19px; margin: 10px 0 10px; color: var(--blue-950); }
.value-card p { color: var(--muted); font-size: 14px; }

.timeline { display: grid; grid-template-columns: 150px 46px 1fr; row-gap: 0; max-width: 860px; }
.tl-node { text-align: right; padding: 26px 18px 26px 0; }
.tl-node b { font-weight: 900; color: var(--blue-700); font-variant-numeric: tabular-nums; font-size: 17px; }
.tl-node span { display: block; font-size: 12.5px; color: var(--muted); margin-top: 2px; }
.tl-axis { position: relative; display: grid; justify-items: center; }
.tl-axis::before { content: ""; position: absolute; top: 0; bottom: 0; width: 2px; background: #C4D8E8; }
.tl-dot {
  width: 14px; height: 14px; border-radius: 50%; background: var(--orange-500);
  border: 3px solid #fff; box-shadow: 0 0 0 2px var(--orange-500); margin-top: 32px; z-index: 1;
}
.tl-content { padding: 26px 0 26px 22px; border-bottom: 1px dashed var(--line); }
.tl-content h3 { font-size: 17px; color: var(--blue-950); margin-bottom: 5px; }
.tl-content p { color: var(--muted); font-size: 14px; }
.tl-row:last-child .tl-content { border-bottom: 0; }
.tl-row:last-child .tl-axis::before { bottom: 60%; }

.area-chips { display: flex; flex-wrap: wrap; gap: 12px; }
.area-chips span {
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  padding: 9px 20px; font-size: 14.5px; font-weight: 500; color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.area-chips span b { color: var(--blue-700); font-weight: 700; }

/* ---------- 服务详情页 ---------- */
.svc-block { display: grid; grid-template-columns: 440px 1fr; gap: 42px; align-items: center; padding: 30px 0; }
.svc-block + .svc-block { border-top: 1px dashed var(--line); }
.svc-block:nth-child(even) .svc-media { order: 2; }
.svc-media img { border-radius: var(--radius); box-shadow: var(--shadow-md); aspect-ratio: 3/2; object-fit: cover; width: 100%; }
.svc-block h2 { font-size: 25px; font-weight: 900; color: var(--blue-950); margin-bottom: 8px; }
.svc-block .svc-price { display: inline-block; margin: 4px 0 14px; background: var(--blue-100); color: var(--blue-700); font-size: 14px; font-weight: 700; padding: 5px 14px; border-radius: 999px; }
.svc-block p { color: var(--muted); margin-bottom: 14px; font-size: 15px; }
.svc-block ul { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 9px 20px; }
.svc-block ul li { display: flex; gap: 9px; align-items: flex-start; font-size: 14px; color: var(--ink); }
.svc-block ul svg { width: 17px; height: 17px; flex: none; margin-top: 4px; color: var(--blue-700); }

/* ---------- 文章 ---------- */
.article-layout { display: grid; grid-template-columns: 1fr 320px; gap: 46px; align-items: start; }
.article-body { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 44px 48px; box-shadow: var(--shadow-sm); }
.article-body h1 { font-size: 29px; font-weight: 900; color: var(--blue-950); margin-bottom: 16px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 16px; color: var(--muted); font-size: 13.5px; padding-bottom: 20px; border-bottom: 1px solid var(--line); margin-bottom: 28px; font-variant-numeric: tabular-nums; }
.article-meta .cat { color: var(--blue-700); font-weight: 700; }
.article-body .lead { font-size: 17px; color: #33475C; border-left: 4px solid var(--orange-500); padding-left: 16px; margin-bottom: 26px; }
.article-body h2 { font-size: 22px; color: var(--blue-900); margin: 34px 0 14px; padding-top: 6px; }
.article-body h3 { font-size: 18px; color: var(--blue-800); margin: 26px 0 10px; }
.article-body p { margin-bottom: 16px; }
.article-body ul, .article-body ol { margin: 0 0 18px 4px; }
.article-body li { margin-bottom: 8px; }
.article-body .note {
  background: var(--blue-100); border-left: 4px solid var(--blue-700); border-radius: 8px;
  padding: 14px 18px; font-size: 14.5px; margin: 20px 0;
}
.article-body .tip {
  background: #FFF4E8; border-left: 4px solid var(--orange-500); border-radius: 8px;
  padding: 14px 18px; font-size: 14.5px; margin: 20px 0;
}
.article-tags { display: flex; gap: 9px; flex-wrap: wrap; margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--line); }
.article-tags span { background: var(--bg); border: 1px solid var(--line); color: var(--muted); font-size: 12.5px; padding: 4px 12px; border-radius: 999px; }
.back-link { display: inline-flex; align-items: center; gap: 7px; margin-top: 28px; font-weight: 700; font-size: 14.5px; }
.back-link svg { width: 16px; height: 16px; transition: transform .2s ease; }
.back-link:hover svg { transform: translateX(-4px); }

.aside-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm); }
.aside-card + .aside-card { margin-top: 22px; }
.aside-card h3 { font-size: 16px; color: var(--blue-950); padding-bottom: 12px; border-bottom: 2px solid var(--blue-100); margin-bottom: 14px; }
.aside-list { list-style: none; display: grid; gap: 4px; }
.aside-list a { display: block; padding: 9px 10px; border-radius: 8px; font-size: 14px; color: var(--ink); }
.aside-list a:hover, .aside-list a.on { background: var(--blue-100); color: var(--blue-700); }
.aside-phone { text-align: center; padding: 8px 0 4px; }
.aside-phone .big { font-size: 24px; font-weight: 900; color: var(--orange-500); display: block; margin: 6px 0 2px; font-variant-numeric: tabular-nums; }
.aside-phone p { color: var(--muted); font-size: 13px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; display: grid; gap: 14px; }
.faq-item { background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-sm); overflow: hidden; }
.faq-item summary {
  display: flex; align-items: center; gap: 14px; cursor: pointer; list-style: none;
  padding: 20px 24px; font-weight: 700; font-size: 16px; color: var(--blue-950);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .faq-q {
  width: 30px; height: 30px; flex: none; border-radius: 9px; background: var(--blue-100);
  color: var(--blue-700); display: grid; place-items: center; font-weight: 900; font-size: 15px;
}
.faq-item summary .faq-arrow { margin-left: auto; width: 20px; height: 20px; color: var(--blue-700); transition: transform .25s ease; flex: none; }
.faq-item[open] summary .faq-arrow { transform: rotate(180deg); }
.faq-item .faq-body { padding: 0 24px 22px 68px; color: var(--muted); font-size: 14.5px; }
.faq-item .faq-body p { margin-bottom: 10px; }
.faq-item .faq-body p:last-child { margin-bottom: 0; }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 30px; }
.contact-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.contact-card { padding: 28px 26px; }
.contact-card .c-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--blue-100); color: var(--blue-700); display: grid; place-items: center; margin-bottom: 16px; }
.contact-card .c-icon svg { width: 24px; height: 24px; }
.contact-card h3 { font-size: 17px; margin-bottom: 8px; color: var(--blue-950); }
.contact-card p, .contact-card a { color: var(--muted); font-size: 14.5px; line-height: 1.9; }
.contact-card a.strong { color: var(--orange-600); font-weight: 900; font-size: 20px; letter-spacing: .01em; font-variant-numeric: tabular-nums; }
.contact-card .sub { font-size: 12.5px; color: var(--muted); margin-top: 6px; }

.contact-panel { background: var(--blue-900); color: #fff; border-radius: var(--radius); padding: 34px 32px; }
.contact-panel h2 { font-size: 22px; margin-bottom: 10px; }
.contact-panel p { color: #C9DCEB; font-size: 14.5px; margin-bottom: 20px; }
.contact-panel .area-chips span { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.18); color: #EAF4FC; }
.contact-panel .area-chips span b { color: #7FD1F0; }
.contact-panel .btn-phone { width: 100%; margin-top: 8px; }
.workhours { display: grid; gap: 8px; margin-bottom: 22px; }
.workhours li { display: flex; justify-content: space-between; font-size: 14px; color: #DFECF6; list-style: none; border-bottom: 1px dashed rgba(255,255,255,.16); padding-bottom: 8px; }
.workhours li span:last-child { color: #fff; font-weight: 700; font-variant-numeric: tabular-nums; }

/* ---------- 页脚 ---------- */
.footer { background: var(--blue-950); color: #BFD7EA; font-size: 14px; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 44px; padding: 64px 0 44px; }
.footer h3 { color: #fff; font-size: 16px; margin-bottom: 18px; }
.footer .f-brand p { color: #9FBBD2; font-size: 13.5px; margin: 14px 0 18px; max-width: 300px; }
.footer ul { list-style: none; display: grid; gap: 10px; }
.footer a { color: #BFD7EA; }
.footer a:hover { color: #fff; }
.footer .f-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer .f-contact svg { width: 16px; height: 16px; flex: none; margin-top: 4px; color: var(--cyan-500); }
.footer .f-hot { color: var(--orange-500); font-weight: 900; font-size: 21px; font-variant-numeric: tabular-nums; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 18px 0; text-align: center; font-size: 13px; color: #8FA9BE; }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 90;
  width: 46px; height: 46px; border-radius: 12px; border: 0; cursor: pointer;
  background: var(--blue-700); color: #fff; box-shadow: var(--shadow-md);
  display: grid; place-items: center; opacity: 0; visibility: hidden;
  transform: translateY(10px); transition: opacity .25s ease, transform .25s ease, visibility .25s, background .2s ease;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--blue-600); }
.back-top svg { width: 20px; height: 20px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .service-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); row-gap: 36px; }
  .process-step:nth-child(3)::after, .process-step:nth-child(4)::after { display: none; }
  .process-step:nth-child(odd)::after { display: none; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3)::before { display: none; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--line); }
  .hero-grid { grid-template-columns: 1fr; }
  .about-intro { grid-template-columns: 1fr; gap: 36px; }
  .svc-block { grid-template-columns: 1fr; gap: 26px; }
  .svc-block:nth-child(even) .svc-media { order: 0; }
  .article-layout { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 36px; }
  .timeline { grid-template-columns: 110px 40px 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-title { font-size: 26px; }
  .topbar-inner { justify-content: center; }
  .tb-right { display: none; }
  .nav {
    position: fixed; inset: 0; top: 0; z-index: 120;
    background: rgba(7, 44, 71, .98);
    flex-direction: column; align-items: center; justify-content: center; gap: 10px;
    opacity: 0; visibility: hidden; transition: opacity .25s ease, visibility .25s;
  }
  .nav.open { opacity: 1; visibility: visible; }
  .nav a { color: #EAF4FC; font-size: 19px; padding: 12px 26px; }
  .nav a:hover, .nav a.active { background: rgba(255,255,255,.1); color: #fff; }
  .header .btn-phone { display: none; }
  .nav-toggle { display: flex; margin-left: auto; z-index: 130; position: relative; }
  .nav-toggle span { background: #fff; }
  .header-inner { min-height: 66px; }
  .hero { padding: 72px 0 0; }
  .hero h1 { font-size: 32px; }
  .hero-badges { gap: 8px; }
  .stats { margin-top: 52px; }
  .service-grid, .news-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; gap: 30px; }
  .process-step::after { display: none; }
  .value-grid { grid-template-columns: 1fr; }
  .contact-cards { grid-template-columns: 1fr; }
  .article-body { padding: 28px 24px; }
  .article-body h1 { font-size: 24px; }
  .footer-top { grid-template-columns: 1fr; gap: 30px; padding: 48px 0 30px; }
  .page-hero { padding: 60px 0 52px; }
  .svc-block ul { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 92px 36px 1fr; }
  .tl-node b { font-size: 15px; }
  .ai-float { right: 10px; bottom: -16px; }
}

@media (max-width: 560px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .contact-panel { padding: 26px 22px; }
  .price-table th, .price-table td { padding: 12px 12px; font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}