/* 站点级共享样式：广东华尔赛新能源科技有限公司
   设计方向：工程硬朗型（左右分屏首屏 + 卡片轨 + 工艺能力带 + 场景对照表）
   配色：深海蓝（深色块统一语汇）+ 电光青（主色与焦点）+ 冷白基底；变量为本站唯一色板，
   页面级样式只引用不另起。深色块（顶部条 / 行动区 / 页脚）一律用 var(--ink)；
   浅色内容区在白底与 var(--surface) 之间交替，质量看板也落在这一套浅色底上，不单独用深底。 */

:root {
  --brand: #0b84b8;
  --brand-strong: #075e85;
  --brand-soft: #e8f4fa;
  --brand-light: #5fd2ee; /* 深色底上的强调色 */
  --accent: #1fc3d6;
  --surface: #f4f8fb;
  --bg: #ffffff;
  --ink: #0b1e2e;
  --muted: #5a7285;
  --line: #dbe6ee;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  /* 内容宽度：宽屏下尽量撑满，只留一圈呼吸边距 */
  --wrap: 1680px;
  --header-h: 64px;
  --shadow-sm: 0 1px 2px rgba(11, 30, 46, 0.05);
  --shadow-md: 0 14px 34px rgba(11, 30, 46, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  max-width: 100%;
  overflow-x: clip;
}

body {
  margin: 0;
  max-width: 100%;
  overflow-x: clip;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* 旧浏览器不支持 clip 时退回 hidden，避免横向滚动条 */
@supports not (overflow: clip) {
  html,
  body { overflow-x: hidden; }
}

/* 内容区兜底：任何段内元素都不再把整页顶宽 */
main {
  display: block;
  max-width: 100%;
  overflow-x: clip;
}

@supports not (overflow: clip) {
  main { overflow-x: hidden; }
}

img { max-width: 100%; display: block; }

h1, h2, h3, h4 { margin: 0; line-height: 1.24; letter-spacing: -0.01em; font-weight: 700; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
a { color: inherit; }

/* 中文长标题与长串不撑破容器 */
h1, h2, h3, h4, p, li, dd, dt, summary, a { overflow-wrap: break-word; }

/* 键盘可见焦点：全站统一 */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--ink);
  color: #93aec1;
  font-size: 12.5px;
  letter-spacing: 0.02em;
}

.topbar-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 6px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.topbar-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; }
.topbar-meta a { color: #d5e3ec; text-decoration: none; transition: color 0.2s ease; }
.topbar-meta a:hover { color: var(--brand-light); }
.topbar-sep { color: #3f5b6e; padding: 0 6px; }
.topbar-tag { color: #7d97a8; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(140%) blur(10px);
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.brand-logo {
  height: 38px;
  width: auto;
  flex-shrink: 0;
  display: block;
  transition: transform 0.2s ease;
}

.brand:hover .brand-logo { transform: translateY(-1px); }

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-size: 17px; font-weight: 700; letter-spacing: 0.01em; }
.brand-sub { font-size: 11px; color: var(--muted); letter-spacing: 0.16em; text-transform: uppercase; margin-top: 3px; }

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav > a,
.nav-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 13px;
  font-size: 15px;
  font-family: inherit;
  color: var(--ink);
  text-decoration: none;
  background: none;
  border: 0;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav > a:hover,
.nav-toggle:hover,
.nav-item:hover > .nav-toggle {
  color: var(--brand-strong);
  background: var(--brand-soft);
}

.nav > a[aria-current="page"],
.nav-toggle[aria-current="page"] { color: var(--brand-strong); }

.nav > a[aria-current="page"]::after,
.nav-toggle[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--brand);
}

.nav-item { position: relative; }

.nav-caret {
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  transition: transform 0.2s ease;
}

.nav-item.is-open .nav-caret { transform: rotate(-135deg) translateY(-2px); }

.nav-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 196px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 2px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

.nav-item:hover .nav-menu,
.nav-item:focus-within .nav-menu,
.nav-item.is-open .nav-menu {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* 桌面端：补上触发项与菜单之间 6px 的透明悬停区，
   指针从按钮斜移到菜单时不会因离开触发项而误把菜单关掉 */
@media (min-width: 901px) {
  .nav-menu::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: -8px;
    height: 8px;
  }
}

.nav-menu a {
  padding: 9px 12px;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-menu a:hover {
  background: var(--brand-soft);
  color: var(--brand-strong);
}

.header-actions { display: flex; align-items: center; gap: 10px; }
.header-actions .btn { padding: 10px 18px; font-size: 14px; }

/* 901–1180 的窄桌面：品牌副标题、导航内边距与按钮一起收一档，
   否则导航项 + 右侧按钮会挤出容器，最右按钮被裁掉 */
@media (min-width: 901px) and (max-width: 1180px) {
  .brand-sub { display: none; }
  .header-inner { gap: 16px; }
  .nav > a,
  .nav-toggle { padding: 9px 10px; font-size: 14.5px; }
  .header-actions .btn { padding: 10px 14px; font-size: 13.5px; }
}

.nav-burger {
  display: none;
  width: 44px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.nav-burger:hover { border-color: var(--brand); background: var(--brand-soft); }

.nav-burger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  position: relative;
}

.nav-burger span::before,
.nav-burger span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
}
.nav-burger span::before { top: -6px; }
.nav-burger span::after { top: 6px; }

.nav-burger span::before,
.nav-burger span::after { transition: top 0.2s ease, transform 0.2s ease; }

/* 展开态：三条线收成关闭图标，明确反馈当前状态 */
.nav-burger[aria-expanded="true"] span { background: transparent; }
.nav-burger[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.nav-burger[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 10px 22px rgba(11, 132, 184, 0.24);
}

.btn-primary:hover {
  background: var(--brand-strong);
  transform: translateY(-2px);
  box-shadow: 0 14px 26px rgba(7, 94, 133, 0.26);
}

.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--brand);
  color: var(--brand-strong);
  transform: translateY(-2px);
}

.btn-ghost:active { transform: translateY(0); }

.btn-arrow {
  width: 14px;
  height: 14px;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.btn:hover .btn-arrow { transform: rotate(45deg) translate(3px, -3px); }

/* ---------- 区块与标题 ---------- */
.sec { padding: 46px 0; }
.sec--surface { background: var(--surface); }
.sec--tight { padding: 38px 0; }

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brand-strong);
}

.kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--brand);
}

.sec-title {
  margin-top: 10px;
  font-size: clamp(23px, 2.8vw, 31px);
}

.sec-sub {
  margin-top: 10px;
  max-width: 660px;
  color: var(--muted);
  font-size: 15.5px;
}

.sec-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.sec-head .btn { flex-shrink: 0; }

.section-sep {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

/* 内页页头 */
.page-hero {
  padding: 42px 0 28px;
  background: linear-gradient(180deg, var(--surface), #fff);
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  margin-top: 12px;
  font-size: clamp(28px, 3.4vw, 38px);
}

.page-hero p {
  margin-top: 12px;
  max-width: 640px;
  color: var(--muted);
  font-size: 16px;
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.crumbs a { color: var(--muted); text-decoration: none; transition: color 0.2s ease; }
.crumbs a:hover { color: var(--brand-strong); }
.crumbs .sep { color: #b9cbd6; }
.crumbs strong { font-weight: 600; color: var(--ink); }

/* 通用链接箭头 */
.link-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand-strong);
  text-decoration: none;
  transition: color 0.2s ease, gap 0.2s ease;
}

.link-more:hover { color: var(--brand); gap: 12px; }

/* 深色底（行动区等）上的文字链接 */
.link-more--light { color: #fff; }
.link-more--light:hover { color: var(--brand-light); }

/* ---------- 滚动容器（横向卡片轨等） ---------- */
.rail {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding: 6px 2px 18px;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: rgba(90, 114, 133, 0.35) transparent;
}

.rail::-webkit-scrollbar { height: 8px; }
.rail::-webkit-scrollbar-track { background: transparent; }
.rail::-webkit-scrollbar-thumb { background: rgba(90, 114, 133, 0.32); border-radius: 999px; }
.rail::-webkit-scrollbar-thumb:hover { background: rgba(90, 114, 133, 0.5); }

/* ---------- 对照表 ---------- */
.cmp-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  scrollbar-width: thin;
  scrollbar-color: rgba(90, 114, 133, 0.35) transparent;
}

.cmp-scroll::-webkit-scrollbar { height: 8px; }
.cmp-scroll::-webkit-scrollbar-thumb { background: rgba(90, 114, 133, 0.32); border-radius: 999px; }

.cmp {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.cmp th,
.cmp td {
  padding: 13px 17px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.cmp thead th {
  background: var(--surface);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
  white-space: nowrap;
}

.cmp tbody th {
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  background: rgba(244, 248, 251, 0.6);
}

.cmp tbody tr:last-child th,
.cmp tbody tr:last-child td { border-bottom: 0; }

.cmp tbody tr { transition: background-color 0.2s ease; }
.cmp tbody tr:hover td { background: var(--brand-soft); }

/* ---------- 常见问题 ---------- */
.faq { margin-top: 26px; border-top: 1px solid var(--line); }

.faq details { border-bottom: 1px solid var(--line); }

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 15px 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  transition: color 0.2s ease;
}

.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--brand-strong); }

.faq summary::after {
  content: "+";
  flex-shrink: 0;
  font-size: 22px;
  font-weight: 400;
  line-height: 1;
  color: var(--brand);
  transition: transform 0.2s ease;
}

.faq details[open] summary::after { content: "−"; }

.faq .faq-a {
  padding: 0 4px 16px;
  max-width: 820px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--muted);
}

.faq .faq-a p { margin: 0 0 10px; }
.faq .faq-a p:last-child { margin-bottom: 0; }

/* ---------- 分页 ---------- */
.pager {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 30px;
}

.pager a,
.pager span {
  min-width: 42px;
  height: 42px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  background: #fff;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.pager a:hover { border-color: var(--brand); color: var(--brand-strong); background: var(--brand-soft); }

.pager .is-current {
  border-color: var(--brand);
  background: var(--brand);
  color: #fff;
  font-weight: 600;
}

/* ---------- 表单基础 ---------- */
.field { display: flex; flex-direction: column; gap: 8px; }

.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.input,
.textarea,
.select {
  width: 100%;
  padding: 13px 15px;
  font-family: inherit;
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input::placeholder,
.textarea::placeholder { color: #93a9b8; }

.input:hover,
.textarea:hover,
.select:hover { border-color: #c3d6e2; }

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(11, 132, 184, 0.14);
}

.textarea { min-height: 140px; resize: vertical; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: #d5e3ec;
  margin-top: 0;
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 44px 24px 18px;
  display: grid;
  grid-template-columns: 1.7fr 1fr 1.3fr;
  gap: 32px;
}

.footer-brand .brand { color: #fff; }
.footer-brand .brand-logo { height: 34px; padding: 7px 10px; background: #fff; border-radius: 8px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-sub { color: #8fa9ba; }
.footer-desc { margin-top: 12px; font-size: 14px; color: #9ab3c4; max-width: 360px; }

.footer-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: #7d97a8;
  margin-bottom: 16px;
}

.footer-nav { display: flex; flex-direction: column; gap: 10px; }

.footer-nav a,
.footer-contact a {
  font-size: 14.5px;
  color: #d5e3ec;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-nav a:hover,
.footer-contact a:hover { color: var(--brand-light); }

.footer-contact { display: flex; flex-direction: column; gap: 12px; font-size: 14.5px; }
.footer-contact .footer-label { display: block; font-size: 12px; color: #7d97a8; letter-spacing: 0.08em; margin-bottom: 2px; }

.footer-bottom {
  max-width: var(--wrap);
  margin: 0 auto;
  /* 左右留边一致，中间的备案号才是页面正中的位置 */
  padding: 14px 24px 18px;
  border-top: 1px solid rgba(219, 230, 238, 0.16);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px 20px;
  font-size: 13px;
  color: #7d97a8;
}

/* 备案号居中：两侧列等宽，中间列始终落在页脚正中 */
.footer-icp { text-align: center; font-size: 12.5px; letter-spacing: 0.02em; }
.footer-icp a { color: #8fa9ba; text-decoration: none; transition: color 0.2s ease; }
.footer-icp a:hover,
.footer-icp a:focus-visible { color: var(--brand-light); text-decoration: underline; }

.footer-crawl { display: flex; align-items: center; gap: 16px; justify-self: end; margin-right: 140px; }

.footer-crawl a {
  color: #8fa9ba;
  text-decoration: none;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.footer-crawl a:hover { color: var(--brand-light); text-decoration: underline; }

/* ---------- 入场动效（无脚本时内容始终可见） ---------- */
html.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

html.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .brand-logo, .link-more, .nav-caret, .nav-menu { transition: none; }
  .btn:hover, .btn:active, .brand:hover .brand-logo { transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 34px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .header-inner { gap: 12px; }
  .header-actions .btn { display: none; }
  .nav-burger { display: inline-flex; flex-shrink: 0; }

  /* 品牌区可收缩，保证汉堡按钮始终留在视口内 */
  .brand { min-width: 0; }
  .brand-text { min-width: 0; overflow: hidden; }
  .brand-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

  .nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 16px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    /* 矮屏 / 横屏时菜单可能比视口高：限制高度并在菜单内部滚动，
       保证最下面的「联系我们」始终可达（预留顶部信息条的高度） */
    max-height: calc(100vh - var(--header-h) - 40px);
    max-height: calc(100dvh - var(--header-h) - 40px);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: rgba(90, 114, 133, 0.35) transparent;
  }

  .nav.is-open { display: flex; }

  .nav::-webkit-scrollbar { width: 6px; }
  .nav::-webkit-scrollbar-track { background: transparent; }
  .nav::-webkit-scrollbar-thumb { background: rgba(90, 114, 133, 0.3); border-radius: 999px; }

  .nav > a,
  .nav-toggle { padding: 13px 12px; font-size: 16px; width: 100%; justify-content: space-between; }

  .nav > a[aria-current="page"]::after,
  .nav-toggle[aria-current="page"]::after { display: none; }

  .nav-item { width: 100%; }

  .nav-menu {
    position: static;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: 0;
    padding: 0 0 6px 16px;
    min-width: 0;
  }

  /* 触屏下不跟随 :hover（否则点过之后悬停态残留，菜单会「点不开也关不掉」），
     只由点击切换的 is-open 控制展开 */
  .nav-item.is-open > .nav-menu { display: flex; }

  .nav-menu a { padding: 11px 12px; }
}

@media (max-width: 900px) {
  .topbar-tag { display: none; }
  /* 窄屏三栏放不下，版权 / 备案号 / 站点文件改为左对齐竖排 */
  .footer-bottom { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer-icp { text-align: left; }
  .footer-crawl { justify-self: auto; margin-right: 0; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .topbar-inner { padding: 8px 18px; }
  .header-inner { padding: 0 18px; }
  .brand-sub { display: none; }
  .brand-logo { height: 32px; }
  .footer-brand .brand-logo { height: 30px; }
  .sec { padding: 38px 0; }
  .page-hero { padding: 34px 0 24px; }
  .footer-inner { padding: 46px 18px 20px; grid-template-columns: 1fr; gap: 30px; }
  /* 竖排后链接落在左侧，底部预留悬浮问答按钮的高度，避免压住版权行 */
  .footer-bottom { padding: 16px 18px 78px; }
  .cmp th, .cmp td { padding: 14px 16px; }
  .btn { padding: 12px 20px; }

  /* 移动端表单控件字号不小于 16px：否则点进输入框时页面会被自动放大，
     放大后按钮常被挤到视口外，出现「点不到」 */
  .input,
  .textarea,
  .select { font-size: 16px; }

  /* 文字链在触屏上补足点击高度，避免点不中 */
  .link-more { min-height: 44px; }
}

/* 小屏手机（390–430）兜底：汉堡一定在，桌面导航一定不出现 */
@media (max-width: 430px) {
  .nav { display: none; }
  .nav.is-open { display: flex; }
  .nav-burger { display: inline-flex; flex-shrink: 0; }
  .header-actions .btn { display: none; }
  .header-inner { gap: 10px; padding: 0 16px; }
  .topbar-inner { padding: 8px 16px; }
  .wrap { padding: 0 16px; }
  .brand-name { font-size: 16px; }
  .btn { padding: 11px 18px; font-size: 14px; }
}