/* ============================================================
   云筹网络官网 · V1.0 设计系统
   原则：黑白灰编辑感 + 单一品牌红；动效只改 transform/opacity
   ============================================================ */

:root {
  --accent: #E8353F;
  --accent-deep: #C72631;
  --ink: #18181B;
  --ink-2: #52525B;
  --ink-3: #8E8E96;
  --line: #E4E4E7;
  --bg: #FFFFFF;
  --bg-soft: #FAFAFA;
  --bg-dark: #131316;
  --shadow-card: 0 12px 40px rgba(24, 24, 27, .08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --radius-btn: 999px;
  --radius-card: 14px;
  --radius-input: 10px;
  --container: 1200px;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  color-scheme: light;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--bg);
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
strong { font-weight: 600; }

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

/* ---------- 排版 ---------- */

h1, h2, h3 { line-height: 1.25; font-weight: 700; text-wrap: balance; }

.display {
  font-size: clamp(34px, 4.4vw, 52px);
  line-height: 1.15;
  letter-spacing: .01em;
}

.h1 { font-size: clamp(28px, 3.4vw, 40px); }
.h2 { font-size: clamp(23px, 2.6vw, 30px); }
.h3 { font-size: clamp(18px, 1.6vw, 20px); font-weight: 600; }

.lead {
  font-size: clamp(16px, 1.5vw, 18px);
  color: var(--ink-2);
  max-width: 65ch;
}

.section-head { max-width: 720px; margin-bottom: clamp(36px, 5vw, 56px); }
.section-head p { margin-top: 14px; color: var(--ink-2); }

.num { font-variant-numeric: tabular-nums; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--ink);
}
.text-link::after { content: "→"; transition: transform .2s var(--ease-out); }
.text-link:hover::after { transform: translateX(4px); }
.text-link:hover { color: var(--accent); }

/* ---------- 区块节奏 ---------- */

.section { padding-block: clamp(64px, 9vw, 104px); }
.section-soft { background: var(--bg-soft); }
.section-tight { padding-block: clamp(48px, 6vw, 72px); }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-btn);
  border: 1px solid transparent;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .2s var(--ease-out), background-color .2s, border-color .2s, box-shadow .2s;
}
.btn:active { transform: translateY(1px) scale(.99); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-1px); }

.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); transform: translateY(-1px); }

.btn-lg { padding: 16px 40px; font-size: 17px; }

/* ---------- 顶部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header.scrolled { box-shadow: 0 6px 24px rgba(24, 24, 27, .06); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
  margin-right: auto;
}
.brand svg, .brand img { flex: none; }

.site-nav { display: flex; align-items: center; gap: 30px; }
.site-nav a {
  font-size: 15.5px;
  color: var(--ink-2);
  padding-block: 6px;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--accent); font-weight: 600; }

.nav-cta { padding: 10px 24px; font-size: 15px; }

/* 抽屉内的 CTA（仅移动端菜单中显示） */
.site-nav .nav-drawer-cta { display: none; }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transform: translateX(-50%);
  transition: transform .25s var(--ease-out), opacity .2s;
}
.nav-toggle span { top: 50%; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateX(-50%) translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateX(-50%) translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */

.hero { padding-block: clamp(56px, 8vw, 96px) clamp(56px, 7vw, 88px); overflow: hidden; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

.hero h1 .accent-underline {
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-size: 100% 8px;
  background-position: 0 92%;
  padding-bottom: 4px;
}

.hero-copy .lead { margin-top: 22px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

.hero-collage {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 20px;
  min-height: 460px;
}
.hero-collage figure {
  width: min(44%, 250px);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: var(--bg-soft);
}
.hero-collage figure:first-child { align-self: flex-start; transform: rotate(-2deg); }
.hero-collage figure:last-child { align-self: flex-end; transform: rotate(2deg) translateY(28px); }
.hero-collage img { width: 100%; }

/* ---------- 数据带 ---------- */

.stats { background: var(--bg-dark); color: #fff; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding-block: clamp(44px, 5vw, 64px);
}
.stat b {
  display: block;
  font-size: clamp(38px, 4vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.stat b sup { font-size: .45em; color: var(--accent); margin-left: 2px; }
.stat span { display: block; margin-top: 10px; font-size: 14px; color: #A1A1AA; }

/* ---------- 问题行（编号编辑式） ---------- */

.problem-row {
  display: grid;
  grid-template-columns: 96px 1fr 1.3fr;
  gap: clamp(20px, 3vw, 48px);
  align-items: start;
  padding-block: clamp(28px, 3.4vw, 40px);
  border-top: 1px solid var(--line);
}
.problem-row:last-of-type { border-bottom: 1px solid var(--line); }

.problem-no {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.problem-row h3 { font-size: clamp(20px, 2vw, 24px); }
.problem-row h3 small {
  display: block;
  font-size: 13.5px;
  font-weight: 400;
  color: var(--ink-3);
  margin-top: 6px;
  letter-spacing: .04em;
}
.problem-row p { color: var(--ink-2); }

/* ---------- 服务网格 ---------- */

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.service-item {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 28px 26px;
  transition: transform .25s var(--ease-out), box-shadow .25s;
}
.service-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.service-item .no {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.service-item h3 { margin-top: 10px; }
.service-item p { margin-top: 8px; font-size: 15px; color: var(--ink-2); }

/* ---------- 案例卡 ---------- */

.case-list { display: grid; gap: 28px; }

.case-card {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(24px, 3.5vw, 48px);
  align-items: center;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: transform .25s var(--ease-out), box-shadow .25s;
}
.case-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.case-card > figure { height: 100%; }
.case-card > figure img { width: 100%; height: 100%; object-fit: cover; }
.case-body { padding: clamp(22px, 3vw, 36px) clamp(22px, 3vw, 40px) clamp(22px, 3vw, 36px) 0; }
.case-body .tag {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--accent);
  background: rgba(232, 53, 63, .08);
  border-radius: 999px;
  padding: 4px 12px;
}
.case-body h3 { font-size: clamp(20px, 2vw, 24px); margin-top: 14px; }
.case-body > p { margin-top: 10px; color: var(--ink-2); font-size: 15.5px; }

.case-facts {
  display: grid;
  grid-template-columns: repeat(3, auto);
  justify-content: start;
  gap: clamp(20px, 2.5vw, 40px);
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.case-facts b {
  display: block;
  font-size: 24px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.case-facts span { font-size: 13px; color: var(--ink-3); }

/* ---------- 爆文横滑墙 ---------- */

.note-rail {
  --per: 3; /* 每轮展示张数：桌面 3 / 移动 2（见媒体查询） */
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: calc((100% - 48px - (var(--per) - 1) * 20px) / var(--per));
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 8px 24px 24px;
  margin-inline: -24px;
  scrollbar-width: thin;
}
.note-rail figure {
  scroll-snap-align: start;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: var(--bg);
  transition: transform .25s var(--ease-out);
}
.note-rail figure:hover { transform: translateY(-4px); }
.note-rail img { width: 100%; }
.rail-hint { font-size: 13px; color: var(--ink-3); margin-top: 4px; }
.note-rail { scrollbar-width: none; cursor: grab; user-select: none; -webkit-user-select: none; }
.note-rail.dragging { cursor: grabbing; scroll-snap-type: none; }
.note-rail img { -webkit-user-drag: none; }
.note-rail::-webkit-scrollbar { display: none; }
.rail-dots { display: flex; justify-content: center; gap: 10px; margin: 2px 0 6px; }
.rail-dot { width: 10px; height: 10px; border-radius: 5px; border: none; background: #c9ced6; cursor: pointer; padding: 0; transition: width .25s ease, background .25s ease; }
.rail-dot.on { width: 28px; background: #6b7280; }
.rail-btn { position: absolute; top: 42%; transform: translateY(-50%); z-index: 3; width: 40px; height: 40px; border-radius: 50%; border: none; background: rgba(255,255,255,.94); box-shadow: var(--shadow-card); font-size: 20px; line-height: 1; color: var(--ink-2); cursor: pointer; display: flex; align-items: center; justify-content: center; }
.rail-btn:hover { color: var(--brand); }
.rail-btn[disabled] { opacity: .3; cursor: default; }
.rail-btn.prev { left: 10px; }
.rail-btn.next { right: 10px; }

/* ---------- 品牌墙 ---------- */

.brand-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.brand-wall > span {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 196px;
  padding: 22px 14px 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  text-align: center;
}
.brand-wall img {
  display: block;
  max-height: 128px;
  max-width: 72%;
  width: auto;
  height: auto;
  object-fit: contain;
  transition: transform .25s var(--ease-out);
}
.brand-wall > span:hover img { transform: scale(1.04); }
.brand-wall .name {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink-2);
}
.brand-note { margin-top: 16px; font-size: 13px; color: var(--ink-3); }

.city-group + .city-group { margin-top: 40px; }
.city-group h3 { font-size: 17px; color: var(--ink-2); margin-bottom: 16px; font-weight: 600; }

/* ---------- FAQ ---------- */

.faq { max-width: 820px; }
.faq details {
  border-bottom: 1px solid var(--line);
  padding-block: 6px;
}
.faq summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-block: 18px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  flex: none;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-weight: 400;
  font-size: 18px;
  color: var(--ink-2);
  transition: transform .25s var(--ease-out), background-color .2s, color .2s, border-color .2s;
}
.faq details[open] summary::after {
  content: "−";
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.faq .answer { padding-bottom: 20px; color: var(--ink-2); max-width: 65ch; }

/* ---------- CTA 区 ---------- */

.cta-band { background: var(--bg-dark); color: #fff; text-align: center; }
.cta-band .h2 { color: #fff; }
.cta-band p { color: #A1A1AA; margin-top: 14px; }
.cta-band .hero-actions { justify-content: center; }
.cta-band .phone-hint { margin-top: 20px; font-size: 14px; color: #A1A1AA; }
.cta-band .phone-hint b { color: #fff; font-size: 17px; letter-spacing: .04em; }

/* ---------- 面包屑 ---------- */

.breadcrumb { padding-top: 28px; font-size: 13.5px; color: var(--ink-3); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 6px; }
.breadcrumb li + li::before { content: "/"; margin-right: 6px; color: var(--line); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb [aria-current] { color: var(--ink-2); }

/* ---------- 页头横幅（子页） ---------- */

.page-hero { padding-block: clamp(48px, 6vw, 72px) clamp(36px, 5vw, 56px); }
.page-hero .lead { margin-top: 16px; }

/* ---------- 表单 ---------- */

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}

.contact-cards { display: grid; gap: 16px; }
.contact-card {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 22px 24px;
  background: var(--bg);
}
.contact-card svg { flex: none; margin-top: 4px; }
.contact-card h3 { font-size: 16px; }
.contact-card p { font-size: 15px; color: var(--ink-2); margin-top: 4px; }
.contact-card .big { font-size: 18px; font-weight: 600; color: var(--ink); }
.contact-card img { border-radius: 8px; }

.form-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: clamp(24px, 3vw, 36px);
  box-shadow: var(--shadow-card);
}
.form-card h2 { font-size: 20px; margin-bottom: 6px; }
.form-card > p { font-size: 14px; color: var(--ink-3); margin-bottom: 22px; }

.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14.5px; font-weight: 600; margin-bottom: 8px; }
.field label em { color: var(--accent); font-style: normal; margin-left: 2px; }
.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  font-size: 15px;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-input);
  transition: border-color .2s, box-shadow .2s;
}
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(232, 53, 63, .12);
}
.field input::placeholder, .field textarea::placeholder { color: #B3B3B9; }
.form-note { font-size: 13px; color: var(--ink-3); margin-top: 14px; }

/* ---------- 文章 ---------- */

.article-list { display: grid; gap: 20px; }
.article-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 24px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: clamp(22px, 3vw, 30px);
  background: var(--bg);
  transition: transform .25s var(--ease-out), box-shadow .25s;
}
.article-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-card); }
.article-card h2 { font-size: clamp(18px, 2vw, 22px); }
.article-card h2 a:hover { color: var(--accent); }
.article-card .meta { grid-column: 1; font-size: 13px; color: var(--ink-3); }
.article-card p { grid-column: 1; margin-top: 8px; font-size: 15px; color: var(--ink-2); }
.article-card .go { grid-row: 1 / span 3; grid-column: 2; font-size: 22px; color: var(--ink-3); }

.prose { max-width: 760px; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-size: clamp(21px, 2.2vw, 26px); margin-top: 2em; }
.prose h3 { font-size: 18px; margin-top: 1.6em; }
.prose p, .prose li { color: #3A3A40; }
.prose ul { padding-left: 1.2em; }
.prose ul li { list-style: none; position: relative; padding-left: 1em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .8em;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
}
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 6px 0 6px 20px;
  color: var(--ink-2);
  background: var(--bg-soft);
  border-radius: 0 8px 8px 0;
}
.article-meta { font-size: 14px; color: var(--ink-3); margin-top: 14px; }
.article-end { margin-top: 3em; padding-top: 2em; border-top: 1px solid var(--line); color: var(--ink-2); }

/* ---------- 信息表（工商信息等） ---------- */

.info-table { max-width: 760px; }
.info-table .row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding-block: 14px;
  border-bottom: 1px solid var(--line);
  font-size: 15.5px;
}
.info-table .row dt { color: var(--ink-3); }
.info-table .row dd { color: var(--ink); }

/* ---------- 页脚 ---------- */

.site-footer { background: var(--bg-dark); color: #C7C7CC; font-size: 14.5px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: clamp(32px, 4vw, 64px);
  padding-block: clamp(48px, 6vw, 72px) 40px;
}
.footer-brand p { margin-top: 14px; color: #8E8E96; max-width: 34ch; }
.site-footer .brand { color: #fff; }
.footer-col h3 { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 16px; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { color: #A1A1AA; transition: color .2s; }
.footer-col a:hover { color: #fff; }
.footer-col address { font-style: normal; color: #A1A1AA; line-height: 2; }

.footer-bottom {
  border-top: 1px solid #2A2A30;
  padding-block: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  justify-content: space-between;
  font-size: 13px;
  color: #8E8E96;
}
.footer-bottom a { color: #8E8E96; }
.footer-bottom a:hover { color: #fff; }

/* ---------- 键盘可达性 ---------- */

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- 移动端吸底转化栏 ---------- */

.mobile-cta-bar { display: none; }

/* ---------- 404 ---------- */

.notfound { text-align: center; padding-block: 120px; }
.notfound .code { font-size: 88px; font-weight: 700; color: var(--accent); line-height: 1; }
.notfound p { color: var(--ink-2); margin: 18px 0 30px; }

/* ---------- 滚动显现动效 ----------
   渐进增强：仅当 <html> 带 .js 类（JS 可用）时才做初始隐藏，
   保证无 JS 环境与搜索引擎爬虫（如百度）能读到全部内容。 */

.js .reveal { opacity: 0; transform: translateY(16px); }
.js .reveal.in {
  opacity: 1;
  transform: none;
  transition: opacity .6s var(--ease-out), transform .6s var(--ease-out);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; }
  .btn, .case-card, .service-item, .note-rail figure, .article-card { transition: none; }
  .hero-collage figure { transform: none; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 1023px) {
  .brand-wall { grid-template-columns: repeat(3, 1fr); }
  .hero-collage { min-height: 400px; }
}

@media (max-width: 767px) {
  body {
    font-size: 15.5px;
    /* 为吸底转化栏预留空间，含 iPhone 底部安全区 */
    padding-bottom: calc(62px + env(safe-area-inset-bottom, 0px));
  }
  .container { padding-inline: 16px; }
  a, button { -webkit-tap-highlight-color: transparent; }

  /* 吸底转化栏：电话直拨 + 方案入口 */
  .mobile-cta-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 40;
    display: flex;
    gap: 10px;
    padding: 10px 16px calc(10px + env(safe-area-inset-bottom, 0px));
    background: rgba(255, 255, 255, .96);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--line);
  }
  .mobile-cta-bar .btn { flex: 1; padding: 12px 8px; font-size: 15.5px; }

  /* 抽屉菜单里的 CTA */
  .site-nav .nav-drawer-cta {
    display: flex;
    justify-content: center;
    margin-top: 16px;
    padding: 13px;
    border-bottom: none;
  }

  /* iOS：输入框字号 ≥16px，聚焦时不触发页面自动放大 */
  .field input,
  .field select,
  .field textarea { font-size: 16px; }

  /* 信息表在窄屏改为上下堆叠 */
  .info-table .row { grid-template-columns: 1fr; gap: 4px; padding-block: 12px; }

  /* 导航折叠 */
  .nav-toggle { display: block; }
  .nav-cta { display: none; }
  .site-nav {
    position: fixed;
    inset: 68px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 48px rgba(24, 24, 27, .08);
    padding: 8px 16px 16px;
    display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a {
    font-size: 18px;
    padding: 14px 4px;
    border-bottom: 1px solid var(--bg-soft);
  }
  .site-nav a[aria-current="page"] { border-bottom-color: rgba(232, 53, 63, .2); }

  .hero-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 40px; }
  .hero-collage { min-height: 0; margin-top: 8px; }
  .hero-collage figure { width: 46%; }
  .hero-collage figure:last-child { transform: rotate(2deg) translateY(18px); }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px 20px; }

  .problem-row { grid-template-columns: 56px 1fr; }
  .problem-row p { grid-column: 2; margin-top: 4px; }
  .problem-no { font-size: 24px; }

  .service-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .service-item { padding: 20px 18px; }

  .case-card { grid-template-columns: 1fr; }
  .case-body { padding: 0 22px 24px; }
  .case-facts { grid-template-columns: repeat(3, auto); gap: 18px; }

  .brand-wall { grid-template-columns: repeat(2, 1fr); }
  .brand-wall > span { min-height: 160px; padding: 18px 10px 14px; gap: 10px; }
  .brand-wall img { max-height: 112px; max-width: 78%; }
  .brand-wall .name { font-size: 13px; }
  .note-rail { --per: 2; }

  .contact-layout { grid-template-columns: 1fr; }
  .article-card { grid-template-columns: 1fr; }
  .article-card .go { display: none; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ===== 企业微信二维码弹层（main.js 渐进增强，无 JS 时仍为新页打开大图） ===== */
.qr-overlay[hidden] { display: none; }
.qr-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  flex-direction: column;  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(19, 19, 22, .78);
  cursor: zoom-out;
  opacity: 0;
  transition: opacity .18s ease;
}
.qr-overlay.show { opacity: 1; }
.qr-overlay img {
  width: min(72vw, 300px);
  height: auto;
  background: var(--bg);
  padding: 12px;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  cursor: default;
}
.qr-overlay p {
  margin: 0;
  color: rgba(255, 255, 255, .85);
  font-size: 14px;
  cursor: default;
}