/* ============================================================
 *  ifrego 官网样式表
 * ============================================================ */
:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --ink: #1f2933;
  --ink-soft: #52606d;
  --line: #e4e7eb;
  --accent: #e63946;
  --accent-dark: #c62a37;
  --dark: #14181f;
  --dark-2: #1f2933;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 24, 31, .08);
  --shadow-lg: 0 18px 50px rgba(20, 24, 31, .14);
  --maxw: 1200px;
  --header-h: 68px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
section { scroll-margin-top: 80px; }

/* ---------- 顶部欢迎条 ---------- */
.topbar { background: var(--dark); color: #cbd2d9; font-size: 13px; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 40px; gap: 12px; }
.tb-welcome { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tb-right { display: flex; gap: 18px; flex-shrink: 0; }
.tb-link { display: inline-flex; align-items: center; gap: 6px; color: #cbd2d9; transition: color .2s; }
.tb-link:hover { color: #fff; }
.tb-link svg { fill: currentColor; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.brand .logo-link { display: flex; flex-direction: column; line-height: 1; }
.logo-mark { font-size: 26px; font-weight: 800; letter-spacing: .5px; color: var(--ink); }
.brand .logo-tag { font-size: 11px; letter-spacing: 2px; color: var(--accent); text-transform: uppercase; margin-top: 3px; }

.mainnav { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; align-items: center; }
.mainnav > li > a { font-weight: 600; font-size: 14px; letter-spacing: .5px; color: var(--ink-soft); position: relative; padding: 6px 0; display: inline-flex; align-items: center; gap: 4px; }
.mainnav > li > a:hover { color: var(--accent); }
.mainnav .caret { font-size: 9px; opacity: .7; }
.has-child { position: relative; }
.dropdown {
  position: absolute; top: 100%; left: 0; min-width: 210px;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  box-shadow: var(--shadow); list-style: none; margin: 8px 0 0; padding: 6px 0;
  opacity: 0; visibility: hidden; transform: translateY(8px); transition: .2s;
}
.has-child:hover .dropdown { opacity: 1; visibility: visible; transform: none; }
.dropdown li a { display: block; padding: 10px 18px; font-size: 13px; color: var(--ink-soft); }
.dropdown li a:hover { background: var(--bg-soft); color: var(--accent); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); transition: .25s; }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 26px; border-radius: 999px; font-weight: 700; font-size: 14px; cursor: pointer; border: 1.5px solid transparent; transition: .2s; font-family: inherit; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px rgba(230,57,70,.3); }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); }
.btn-outline { background: #fff; color: var(--accent); border-color: var(--accent); }
.btn-outline:hover { background: var(--accent); color: #fff; }

/* ---------- 首页 Hero ---------- */
.hero { position: relative; min-height: 560px; display: flex; align-items: center; background-size: cover; background-position: center; background-color: var(--dark); }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(120deg, rgba(20,24,31,.85), rgba(20,24,31,.45)); }
.hero-content { position: relative; z-index: 2; color: #fff; max-width: 680px; padding: 80px 22px; }
.hero-content h1 { font-size: clamp(30px, 5vw, 54px); line-height: 1.12; margin: 0 0 18px; font-weight: 800; }
.hero-content p { font-size: clamp(15px, 2vw, 19px); color: #d7dde3; margin: 0 0 30px; }

/* ---------- 内页标题区 ---------- */
.page-hero { position: relative; min-height: 260px; display: flex; align-items: center; background-size: cover; background-position: center; background-color: var(--dark-2); }
.page-hero-overlay { position: absolute; inset: 0; background: linear-gradient(120deg, rgba(20,24,31,.88), rgba(20,24,31,.6)); }
.page-hero .wrap { position: relative; z-index: 2; color: #fff; padding: 70px 22px 50px; }
.page-hero h1 { font-size: clamp(28px, 4vw, 44px); margin: 0 0 10px; font-weight: 800; }
.page-hero p { color: #d7dde3; margin: 0; font-size: 16px; max-width: 760px; }

/* ---------- 通用区块 ---------- */
.section { padding: 80px 0; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(26px, 4vw, 38px); margin: 0 0 10px; font-weight: 800; }
.section-sub { color: var(--ink-soft); margin: 0; font-size: 16px; }
.prose { max-width: 880px; margin: 0 auto; color: var(--ink-soft); font-size: 16px; line-height: 1.85; }

/* ---------- 首页特性 ---------- */
.features { background: var(--bg); }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.feature-card { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px; transition: .25s; }
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: transparent; }
.feature-card .ic { color: var(--accent); margin-bottom: 14px; }
.feature-card h3 { font-size: 18px; margin: 0 0 10px; }
.feature-card p { color: var(--ink-soft); margin: 0; font-size: 14px; }

/* ---------- 首页/关于 数据 ---------- */
.about { background: #fff; }
.about-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-text h2 { font-size: clamp(26px,4vw,36px); margin: 0 0 18px; font-weight: 800; }
.about-text p { color: var(--ink-soft); font-size: 16px; margin: 0 0 22px; }
.about-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.stat { background: var(--bg-soft); border-radius: 12px; padding: 20px; text-align: center; }
.stat b { display: block; font-size: 28px; font-weight: 800; color: var(--accent); }
.stat span { font-size: 13px; color: var(--ink-soft); }

/* ---------- 产品网格（复用） ---------- */
.products { background: var(--bg-soft); }
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform .25s, box-shadow .25s; display: flex; flex-direction: column; }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.card-img { display: block; aspect-ratio: 4/3; background: #eceff3; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.card:hover .card-img img { transform: scale(1.06); }
.card-body { padding: 22px; display: flex; flex-direction: column; flex: 1; }
.card-body h3 { font-size: 17px; margin: 0 0 10px; font-weight: 700; }
.card-desc { color: var(--ink-soft); font-size: 14px; margin: 0 0 16px; }
.spec-list { list-style: none; margin: 0 0 18px; padding: 14px 0 0; border-top: 1px dashed var(--line); display: grid; gap: 7px; }
.spec-list li { display: flex; justify-content: space-between; font-size: 13px; color: var(--ink-soft); }
.spec-list li span { color: #9aa5b1; }
.spec-list li b { color: var(--ink); font-weight: 600; }
.card-body .btn { margin-top: auto; align-self: flex-start; }

/* ---------- 分类卡片（产品总览 / 首页） ---------- */
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.cat-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: .25s; display: flex; flex-direction: column; }
.cat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.cat-img { aspect-ratio: 4/3; background: #eceff3; overflow: hidden; }
.cat-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.cat-card:hover .cat-img img { transform: scale(1.06); }
.cat-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.cat-body h3 { font-size: 18px; margin: 0 0 8px; }
.cat-body p { color: var(--ink-soft); font-size: 13px; margin: 0 0 12px; flex: 1; }
.cat-more { color: var(--accent); font-weight: 700; font-size: 13px; }

/* ---------- 关于：企业文化 / 服务 ---------- */
.culture-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.culture-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; transition: .25s; }
.culture-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.culture-card .ic { color: var(--accent); margin-bottom: 12px; }
.culture-card h3 { font-size: 19px; margin: 0 0 10px; }
.culture-card p { color: var(--ink-soft); margin: 0; font-size: 15px; }

/* ---------- 证书 ---------- */
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cert-item { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px; text-align: center; }
.cert-item img { width: 100%; aspect-ratio: 4/3; object-fit: contain; background: #fff; }
.cert-item p { margin: 10px 0 0; font-size: 12px; color: var(--ink-soft); }

/* ---------- CTA 条 ---------- */
.cta { background: var(--dark-2); color: #fff; }
.cta-inner { text-align: center; }
.cta-inner h2 { font-size: clamp(26px,4vw,38px); margin: 0 0 12px; }
.cta-inner p { color: #cbd2d9; margin: 0 0 26px; font-size: 16px; }

/* ---------- 博客 ---------- */
.blog-tabs { display: flex; gap: 10px; margin-bottom: 30px; flex-wrap: wrap; }
.blog-tabs button { border: 1.5px solid var(--line); background: #fff; color: var(--ink-soft); padding: 9px 22px; border-radius: 999px; cursor: pointer; font-weight: 600; font-size: 14px; transition: .2s; font-family: inherit; }
.blog-tabs button:hover { border-color: var(--accent); color: var(--accent); }
.blog-tabs button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.blog-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.blog-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; }
.blog-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.blog-date { font-size: 13px; color: #9aa5b1; }
.blog-badge { font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 999px; text-transform: uppercase; letter-spacing: .5px; }
.blog-badge.company { background: #e6f4ff; color: #1d6fb8; }
.blog-badge.industry { background: #fdecec; color: var(--accent); }
.blog-card h3 { font-size: 19px; margin: 0 0 10px; line-height: 1.4; }
.blog-excerpt { color: var(--ink-soft); font-size: 14px; margin: 0 0 16px; flex: 1; }
.blog-body { margin: 0 0 16px; color: var(--ink-soft); font-size: 14px; line-height: 1.8; }
.blog-body p { margin: 0 0 12px; }
.blog-card .btn { align-self: flex-start; }

/* ---------- 联系 ---------- */
.contact { background: var(--bg-soft); }
.contact-inner { display: grid; grid-template-columns: 1.3fr 1fr; gap: 50px; align-items: start; }
.contact-left { background: #fff; padding: 28px; border-radius: var(--radius); box-shadow: var(--shadow); }
.contact-form { display: flex; flex-direction: column; gap: 14px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.contact-form input, .contact-form textarea, .contact-form select, .form-select {
  width: 100%; padding: 13px 15px; border: 1.5px solid var(--line); border-radius: 10px;
  font-size: 14px; font-family: inherit; color: var(--ink); background: #fff; transition: border-color .2s;
}
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus { outline: none; border-color: var(--accent); }
.contact-form textarea { resize: vertical; }
.contact-form .btn { width: 100%; }
.form-note { font-size: 12px; color: #9aa5b1; margin: 0; text-align: center; }
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.ci-item { display: flex; align-items: center; gap: 14px; background: #fff; padding: 16px 18px; border-radius: var(--radius); box-shadow: var(--shadow); }
.ci-item .ic { width: 22px; height: 22px; color: var(--accent); flex-shrink: 0; }
.ci-item span { display: block; font-size: 12px; color: #9aa5b1; text-transform: uppercase; letter-spacing: 1px; }
.ci-item b, .ci-item a { font-weight: 600; color: var(--ink); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--dark); color: #cbd2d9; }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-start; padding: 44px 22px; flex-wrap: wrap; gap: 24px; }
.footer-brand .logo-mark { color: #fff; font-size: 24px; }
.footer-brand p { margin: 8px 0 0; font-size: 14px; color: #9aa5b1; max-width: 320px; }
.footer-nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 14px 22px; }
.footer-nav a { color: #cbd2d9; font-size: 14px; }
.footer-nav a:hover { color: #fff; }
.footer-contact { display: flex; flex-direction: column; gap: 6px; text-align: right; font-size: 14px; }
.footer-contact a { color: #fff; }
.footer-contact a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid #2a313a; padding: 16px 0; font-size: 13px; color: #7b8794; text-align: center; }

/* ---------- 产品详情（三级页面） ---------- */
.card-title-link { color: inherit; }
.card-title-link:hover { color: var(--accent); }

.breadcrumb { background: var(--bg-soft); border-bottom: 1px solid var(--line); }
.breadcrumb .wrap { padding-top: 14px; padding-bottom: 14px; font-size: 13px; color: var(--ink-soft); }
.breadcrumb a { color: var(--ink-soft); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 9px; opacity: .5; }
.breadcrumb .current { color: var(--accent); font-weight: 600; }

.product-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: start; margin-bottom: 50px; }
.product-gallery img { width: 100%; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; }
.product-info h1 { font-size: clamp(24px, 3.5vw, 36px); margin: 0 0 12px; font-weight: 800; line-height: 1.2; }
.pd-cat { display: inline-block; font-size: 12px; font-weight: 700; color: var(--accent); background: #fdecec; padding: 4px 13px; border-radius: 999px; margin-bottom: 18px; }
.pd-desc { color: var(--ink-soft); font-size: 16px; margin: 0 0 26px; line-height: 1.8; }
.pd-specs { margin-bottom: 28px; }
.pd-specs h3 { font-size: 18px; margin: 0 0 14px; }
.pd-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.pd-related { border-top: 1px solid var(--line); padding-top: 42px; }
.pd-related h2 { font-size: 24px; margin: 0 0 24px; }
.rel-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.rel-card { display: block; background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; transition: .25s; }
.rel-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.rel-img { aspect-ratio: 4/3; background: #eceff3; }
.rel-img img { width: 100%; height: 100%; object-fit: cover; }
.rel-card span { display: block; padding: 12px 14px; font-size: 13px; color: var(--ink); line-height: 1.4; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .features-grid, .cat-grid, .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .about-inner, .contact-inner { grid-template-columns: 1fr; }
  .culture-grid { grid-template-columns: 1fr; }
  .blog-list { grid-template-columns: 1fr; }
  .footer-contact { text-align: left; }
  .product-detail { grid-template-columns: 1fr; gap: 30px; }
  .rel-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .mainnav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0; padding: 0;
    border-bottom: 1px solid var(--line); max-height: 0; overflow: hidden; transition: max-height .3s;
  }
  .mainnav.open { max-height: 520px; overflow-y: auto; }
  .mainnav > li { border-top: 1px solid var(--line); width: 100%; }
  .mainnav > li > a { display: block; padding: 14px 22px; }
  .mainnav > li > a::after { display: none; }
  /* 移动端：下拉直接展开在父级下 */
  .dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; border-top: 1px dashed var(--line); margin: 0; padding: 0 0 8px; border-radius: 0; }
  .dropdown li a { padding: 10px 34px; font-size: 13px; }
  .products-grid, .features-grid, .cat-grid, .cert-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .hero { min-height: 460px; }
  .tb-welcome { display: none; }
}