/* =========================================================
   苏州嵩原自动化有限公司 官网样式
   主题：参考三木普利官网配色（企业蓝 #1e4ea1 + 品牌红 #cd151b）
   ========================================================= */

:root {
  --c-primary: #1e4ea1;        /* 主色：三木普利企业蓝 */
  --c-primary-dark: #163c7c;
  --c-primary-light: #2b5fbf;
  --c-accent: #cd151b;         /* 点缀色：三木普利品牌红 */
  --c-accent-light: #fdeaea;
  --c-text: #212529;
  --c-text-light: #5b6472;
  --c-border: #e3e7ee;
  --c-bg: #ffffff;
  --c-bg-soft: #f8f9fa;
  --c-bg-dark: #122a52;
  --radius: 10px;
  --shadow-sm: 0 2px 8px rgba(30, 78, 161, 0.08);
  --shadow-md: 0 8px 24px rgba(30, 78, 161, 0.12);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Segoe UI", "Hiragino Sans GB", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  font-size: 16px;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { width: min(1200px, 92%); margin: 0 auto; }

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--c-bg-dark);
  color: #c7d4e6;
  font-size: 13px;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
}
.topbar a:hover { color: #ffffff; }
.topbar .hotline strong { color: #ffb3b3; }

/* ---------- 导航 ---------- */
.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  height: 46px;
  width: auto;
  display: block;
}
.footer-logo {
  height: 44px;
  width: auto;
  display: block;
}
.brand-mark {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
}
.brand-text .cn {
  font-size: 21px;
  font-weight: 700;
  color: var(--c-primary);
  letter-spacing: 1px;
  line-height: 1.3;
}
.brand-text .en {
  font-size: 11px;
  color: var(--c-text-light);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.main-nav ul { display: flex; gap: 6px; }
.main-nav a {
  display: block;
  padding: 9px 18px;
  border-radius: 6px;
  font-size: 15.5px;
  font-weight: 500;
  color: var(--c-text);
  transition: all 0.2s ease;
}
.main-nav a:hover { background: var(--c-bg-soft); color: var(--c-primary); }
.main-nav a.active {
  background: var(--c-primary);
  color: #ffffff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-primary);
  margin: 0 auto;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 首页横幅 ---------- */
.hero {
  position: relative;
  min-height: 540px;
  display: flex;
  align-items: center;
  color: #ffffff;
  background: var(--c-bg-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url("../images/hero.jpg") center / cover no-repeat;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(18, 42, 82, 0.92) 0%, rgba(18, 42, 82, 0.72) 45%, rgba(18, 42, 82, 0.25) 100%);
}
.hero .container { position: relative; z-index: 2; padding: 70px 0; }
.hero-kicker {
  display: inline-block;
  padding: 5px 16px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  font-size: 13.5px;
  letter-spacing: 2px;
  margin-bottom: 22px;
  color: #cfe2ff;
}
.hero h1 {
  font-size: clamp(30px, 4.5vw, 48px);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 16px;
  max-width: 640px;
}
.hero p.lead {
  font-size: 17px;
  color: #d6e2f2;
  max-width: 600px;
  margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 6px;
  font-size: 15.5px;
  font-weight: 600;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-dark); }
.btn-accent { background: var(--c-accent); color: #fff; }
.btn-accent:hover { background: #a81116; }
.btn-outline {
  border-color: rgba(255, 255, 255, 0.6);
  color: #ffffff;
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.12); }
.btn:focus-visible { outline: 3px solid #ffb3b3; outline-offset: 2px; }

/* ---------- 通用区块 ---------- */
.section { padding: 72px 0; }
.section-soft { background: var(--c-bg-soft); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-head .tag {
  display: inline-block;
  color: var(--c-primary-light);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section-head h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--c-primary-dark);
  margin-bottom: 14px;
}
.section-head h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background: var(--c-accent);
  border-radius: 2px;
  margin: 14px auto 0;
}
.section-head p { color: var(--c-text-light); font-size: 15.5px; }

.page-banner {
  position: relative;
  background: linear-gradient(120deg, #163c7c, #2b5fbf);
  color: #fff;
  padding: 58px 0;
  text-align: center;
}
.page-banner h1 { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.page-banner .crumbs { font-size: 13.5px; color: #b8d0ee; }
.page-banner .crumbs a:hover { color: #fff; text-decoration: underline; }

/* ---------- 数字统计 ---------- */
.stats {
  background: #ffffff;
  border-bottom: 1px solid var(--c-border);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 40px 0;
}
.stat { text-align: center; }
.stat .num {
  font-size: 34px;
  font-weight: 700;
  color: var(--c-primary);
  line-height: 1.2;
}
.stat .num small { font-size: 18px; font-weight: 600; }
.stat .label { color: var(--c-text-light); font-size: 14.5px; margin-top: 4px; }

/* ---------- 品牌卡片 ---------- */
.brand-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  max-width: 860px;
  margin: 0 auto;
}
.brand-card {
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
}
.brand-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.brand-card .thumb { aspect-ratio: 4 / 3; overflow: hidden; }
.brand-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.brand-card:hover .thumb img { transform: scale(1.05); }
.brand-card .body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.brand-card .origin {
  display: inline-block;
  align-self: flex-start;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--c-primary-light);
  background: #e9effa;
  border-radius: 4px;
  padding: 2px 10px;
  margin-bottom: 12px;
}
.brand-card h3 { font-size: 20px; color: var(--c-primary-dark); margin-bottom: 4px; }
.brand-card .en-name { font-size: 13px; color: var(--c-text-light); margin-bottom: 12px; letter-spacing: 0.5px; }
.brand-card p { font-size: 14.5px; color: var(--c-text-light); flex: 1; }
.brand-card .tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 6px; }
.brand-card .tags span {
  font-size: 12.5px;
  color: var(--c-text);
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  padding: 3px 12px;
}
.brand-card .more {
  margin-top: 14px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--c-accent);
}
.brand-card .more:hover { text-decoration: underline; }

/* ---------- 优势 ---------- */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.adv-item {
  background: #ffffff;
  border-radius: var(--radius);
  padding: 30px 24px;
  border: 1px solid var(--c-border);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.adv-item:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.adv-item .icon {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: #e9effa;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.adv-item h3 { font-size: 17.5px; color: var(--c-primary-dark); margin-bottom: 8px; }
.adv-item p { font-size: 14px; color: var(--c-text-light); }

/* ---------- 行业应用 ---------- */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}
.industry-item {
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 22px 10px;
  text-align: center;
  transition: all 0.25s ease;
}
.industry-item:hover {
  border-color: var(--c-primary-light);
  background: #eef3fc;
}
.industry-item .icon { font-size: 30px; margin-bottom: 8px; }
.industry-item .name { font-size: 14.5px; font-weight: 600; color: var(--c-text); }

/* ---------- 通用双栏 ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split .img-box {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.split .img-box img { width: 100%; height: 100%; object-fit: cover; }
.split h2 { font-size: 28px; color: var(--c-primary-dark); margin-bottom: 18px; }
.split p { color: var(--c-text-light); margin-bottom: 14px; font-size: 15.5px; }
.check-list li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 10px;
  font-size: 15px;
  color: var(--c-text);
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #e9effa url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 6.5l2.2 2.2 4.8-5' fill='none' stroke='%231e4ea1' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center no-repeat;
}

/* ---------- 产品页（旧版品牌区块，保留兼容） ---------- */
.brand-section {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 48px;
  padding: 48px 0;
  border-bottom: 1px dashed var(--c-border);
  align-items: start;
}
.brand-section:last-of-type { border-bottom: none; }
.brand-section .pic {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 110px;
}
.brand-section .pic img { width: 100%; height: 100%; object-fit: cover; }
.brand-section h2 {
  font-size: 26px;
  color: var(--c-primary-dark);
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.brand-section h2 .en { font-size: 15px; color: var(--c-text-light); font-weight: 500; }
.brand-section .desc { color: var(--c-text-light); margin: 12px 0 22px; font-size: 15px; }
.prod-groups { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.prod-group {
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-primary-light);
  border-radius: 8px;
  padding: 18px 20px;
}
.prod-group h3 { font-size: 16px; color: var(--c-primary-dark); margin-bottom: 6px; }
.prod-group p { font-size: 13.5px; color: var(--c-text-light); }

/* ---------- 产品页（新版：参考三木普利官网「产品群→分类→系列」结构） ---------- */
.prod-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 40px;
  align-items: start;
}

/* 左侧：品牌 / 产品群导航（参考其筛选侧栏） */
.prod-side {
  position: sticky;
  top: 110px;
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.prod-side .side-title {
  background: var(--c-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  padding: 13px 18px;
  letter-spacing: 1px;
}
.side-brand { border-top: 1px solid var(--c-border); }
.side-brand:first-of-type { border-top: none; }
.side-brand > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-primary-dark);
  background: var(--c-bg-soft);
  transition: background 0.2s ease;
}
.side-brand > a:hover { background: #e9effa; }
.side-brand > a .arrow { color: var(--c-accent); font-size: 13px; }
.side-brand ul { padding: 6px 0 10px; }
.side-brand ul a {
  display: block;
  padding: 7px 18px 7px 30px;
  font-size: 13.5px;
  color: var(--c-text-light);
  position: relative;
  transition: color 0.2s ease;
}
.side-brand ul a::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 15px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-border);
}
.side-brand ul a:hover { color: var(--c-primary); }
.side-brand ul a:hover::before { background: var(--c-accent); }

/* 右侧：品牌区块 */
.pbrand { margin-bottom: 64px; scroll-margin-top: 110px; }
.pbrand-head {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  align-items: center;
  margin-bottom: 26px;
}
.pbrand-head .pic {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #ffffff;
}
.pbrand-head .pic img { width: 100%; height: 100%; object-fit: cover; }
.pbrand-head h2 {
  font-size: 26px;
  color: var(--c-primary-dark);
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 3px solid var(--c-accent);
  display: inline-block;
}
.pbrand-head h2 .en { display: block; font-size: 14px; color: var(--c-text-light); font-weight: 500; margin-top: 2px; }
.pbrand-head .desc { color: var(--c-text-light); font-size: 15px; }

/* 产品群 */
.pgroup { margin-bottom: 34px; scroll-margin-top: 110px; }
.pgroup > h3 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 19px;
  color: #ffffff;
  background: linear-gradient(90deg, var(--c-primary) 0%, var(--c-primary-light) 100%);
  border-radius: 8px 8px 0 0;
  padding: 11px 20px;
}
.pgroup > h3 .en { font-size: 13px; font-weight: 500; color: #c9dbf2; }
/* 分类照片墙：每个产品分类一张图卡 */
.cat-wall {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  border: 1px solid var(--c-border);
  border-top: none;
  border-radius: 0 0 8px 8px;
  background: var(--c-bg-soft);
  padding: 18px;
}
.cat-card {
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.cat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.cat-pic {
  aspect-ratio: 16 / 10;
  background: #ffffff;
  border-bottom: 1px solid var(--c-border);
  overflow: hidden;
}
.cat-pic img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.35s ease;
}
.cat-card:hover .cat-pic img { transform: scale(1.06); }
.cat-info { padding: 13px 15px 15px; flex: 1; }
.cat-name {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--c-primary-dark);
  margin-bottom: 9px;
}
.cat-name small { font-size: 12px; font-weight: 500; color: var(--c-text-light); margin-left: 6px; }
.cat-series { display: flex; flex-wrap: wrap; gap: 6px; }
.cat-series span {
  font-size: 12px;
  color: var(--c-text);
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: 2px 9px;
  transition: all 0.2s ease;
}
.cat-series span:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: var(--c-accent-light);
}
.pgroup .note {
  font-size: 13px;
  color: var(--c-text-light);
  margin-top: 10px;
  padding-left: 2px;
}

/* 合作品牌 Logo 墙：一行 4 个 */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  border: 1px solid var(--c-border);
  border-top: none;
  border-radius: 0 0 8px 8px;
  background: var(--c-bg-soft);
  padding: 18px;
}
.logo-card {
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 16px 14px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.logo-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary);
}
.logo-card .logo-img {
  height: 46px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo-card .logo-img img {
  max-height: 46px;
  max-width: 170px;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: saturate(0.92);
  transition: filter 0.25s ease, transform 0.25s ease;
}
.logo-card:hover .logo-img img {
  filter: none;
  transform: scale(1.06);
}
.logo-card .logo-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-text-light);
  text-align: center;
  line-height: 1.4;
}
.logo-wall-note {
  font-size: 12px;
  color: var(--c-text-light);
  margin-top: 10px;
  padding-left: 2px;
}

/* 部品照片墙：常见部品照片 + 名称标签 */
.parts-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  border: 1px solid var(--c-border);
  border-top: none;
  border-radius: 0 0 8px 8px;
  background: var(--c-bg-soft);
  padding: 18px;
}
.part-item {
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.part-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary);
}
.part-item .part-pic {
  aspect-ratio: 4 / 3;
  background: #ffffff;
  overflow: hidden;
}
.part-item .part-pic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}
.part-item:hover .part-pic img { transform: scale(1.06); }
.part-item .part-name {
  padding: 9px 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-text);
  text-align: center;
  line-height: 1.4;
  border-top: 1px solid var(--c-border);
  background: #ffffff;
}

/* ---------- 新闻 ---------- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.news-card {
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.news-card .thumb { aspect-ratio: 16 / 9; overflow: hidden; }
.news-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.news-card .body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.news-card time { font-size: 13px; color: var(--c-text-light); }
.news-card h3 { font-size: 17.5px; color: var(--c-text); margin: 8px 0 10px; line-height: 1.5; }
.news-card p { font-size: 14px; color: var(--c-text-light); flex: 1; }
.news-card .more { margin-top: 14px; color: var(--c-primary-light); font-weight: 600; font-size: 14px; }
.news-card .more:hover { text-decoration: underline; }

/* ---------- 联系页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
}
.contact-info-card {
  background: linear-gradient(150deg, #163c7c, #2b5fbf);
  color: #fff;
  border-radius: var(--radius);
  padding: 36px 32px;
}
.contact-info-card h2 { font-size: 22px; margin-bottom: 24px; }
.contact-line {
  display: flex;
  gap: 14px;
  margin-bottom: 22px;
  font-size: 15px;
  line-height: 1.6;
}
.contact-line .ic {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.contact-line strong { display: block; font-size: 13px; color: #a9c6ea; font-weight: 500; margin-bottom: 2px; }

.form-card {
  background: #ffffff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
}
.form-card h2 { font-size: 22px; color: var(--c-primary-dark); margin-bottom: 6px; }
.form-card .hint { font-size: 14px; color: var(--c-text-light); margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 7px;
}
.form-group label .req { color: #cd151b; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid #cbd5e1;
  border-radius: 7px;
  font-size: 14.5px;
  font-family: var(--font-sans);
  color: var(--c-text);
  background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-primary-light);
  box-shadow: 0 0 0 3px rgba(30, 78, 161, 0.15);
}
.form-msg {
  display: none;
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: 7px;
  background: #e6f7ef;
  color: #0b7a4b;
  font-size: 14.5px;
}
.form-msg.show { display: block; }
.form-msg.error { background: #fdecec; color: #a81116; }

/* ---------- CTA ---------- */
.cta-band {
  background: linear-gradient(120deg, #163c7c, #1e4ea1 60%, #2b5fbf);
  color: #fff;
  text-align: center;
  padding: 64px 0;
}
.cta-band h2 { font-size: 28px; margin-bottom: 12px; }
.cta-band p { color: #c9dbf2; margin-bottom: 28px; font-size: 16px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--c-bg-dark);
  color: #97a8c2;
  font-size: 14px;
  padding: 56px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
}
.site-footer h3 {
  color: #ffffff;
  font-size: 16px;
  margin-bottom: 18px;
  font-weight: 600;
}
.site-footer .about-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.site-footer .about-brand .cn { color: #fff; font-size: 18px; font-weight: 700; }
.site-footer p { line-height: 1.8; font-size: 13.5px; }
.site-footer li { margin-bottom: 9px; }
.site-footer li a:hover { color: #ffffff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 18px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--c-primary);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.3s ease;
  z-index: 900;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--c-primary-dark); }
.back-top:focus-visible { outline: 3px solid #ffb3b3; outline-offset: 2px; }

/* ---------- 动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .brand-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(3, 1fr); }
  .brand-section { grid-template-columns: 1fr; }
  .brand-section .pic { position: static; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-layout { grid-template-columns: 1fr; }
  .prod-side { position: static; }
  .pbrand-head { grid-template-columns: 1fr; }
  .pbrand-head .pic { max-width: 320px; }
  .cat-wall { grid-template-columns: repeat(2, 1fr); }
  .logo-wall { grid-template-columns: repeat(3, 1fr); }
  .parts-wall { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .cat-wall { grid-template-columns: 1fr; }
  .logo-wall { grid-template-columns: repeat(2, 1fr); }
  .parts-wall { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .topbar .container { justify-content: center; }
  .topbar .email { display: none; }
  .nav-toggle { display: flex; }
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-md);
    padding: 10px 4%;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 2px; }
  .main-nav a { padding: 12px 14px; }
  .hero { min-height: 460px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .brand-grid, .news-grid, .adv-grid, .prod-groups, .contact-grid, .split { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
}

/* 无障碍：跳转链接 */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--c-primary);
  color: #fff;
  padding: 8px 16px;
  z-index: 2000;
  border-radius: 0 0 6px 0;
}
.skip-link:focus { left: 0; }