/* ============================================================
   Henan Xiwang Machinery Equipment Co., Ltd. — Design System
   Industrial B2B · 简约大气 · Semantic tokens only
   ============================================================ */
:root {
  /* Brand */
  --color-primary: #0e2338;        /* deep navy — 主色 */
  --color-primary-soft: #1b3a5c;   /* steel navy */
  --color-accent: #e8791e;         /* industrial orange */
  --color-accent-dark: #c9610d;
  /* Surfaces */
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6f9;
  --color-surface: #ffffff;
  --color-footer: #0a1826;
  /* Text */
  --color-text: #1c2530;
  --color-text-muted: #5a6675;
  --color-text-inverse: #ffffff;
  --color-text-inverse-muted: #93a3b5;
  /* Lines */
  --color-border: #e2e8ef;
  --color-border-dark: #24405e;
  /* Radii & shadows */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(14, 35, 56, .08);
  --shadow-md: 0 8px 28px rgba(14, 35, 56, .12);
  /* Type */
  --font-sans: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --text-xs: .8125rem;
  --text-sm: .875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.25rem;
  --text-4xl: 3rem;
  --text-5xl: 3.75rem;
  /* Layout */
  --container: 1200px;
  --section-y: 5.5rem;
  --header-h: 72px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 2rem;
}
.brand { display: flex; align-items: center; gap: .75rem; }
.brand-mark {
  width: 42px; height: 42px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-soft) 100%);
  color: #fff; display: grid; place-items: center;
  font-weight: 800; font-size: 1.05rem; letter-spacing: .5px;
}
.brand-name { font-weight: 800; font-size: 1.05rem; color: var(--color-primary); line-height: 1.2; letter-spacing: .3px; }
.brand-name small { display: block; font-weight: 500; font-size: .68rem; color: var(--color-text-muted); letter-spacing: 1.5px; text-transform: uppercase; }

.main-nav ul { display: flex; gap: 2rem; }
.main-nav a {
  font-size: var(--text-sm); font-weight: 600; color: var(--color-text);
  padding: .4rem 0; position: relative; transition: color .2s;
}
.main-nav a:hover, .main-nav a.active { color: var(--color-accent); }
.main-nav a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--color-accent); border-radius: 2px;
}

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: .5rem; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--color-primary); margin: 5px 0; transition: .25s; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .8rem 1.7rem; border-radius: var(--radius-sm);
  font-weight: 700; font-size: var(--text-sm); letter-spacing: .3px;
  cursor: pointer; border: 2px solid transparent; transition: all .2s;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-dark); transform: translateY(-1px); }
.btn-outline { border-color: var(--color-border-dark); color: var(--color-text-inverse); }
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn-outline-dark { border-color: var(--color-primary); color: var(--color-primary); }
.btn-outline-dark:hover { background: var(--color-primary); color: #fff; }
.btn-sm { padding: .55rem 1.2rem; font-size: var(--text-xs); }

/* ---------- Section helpers ---------- */
.section { padding: var(--section-y) 0; }
.section-alt { background: var(--color-bg-alt); }
.section-head { max-width: 720px; margin: 0 auto 3.5rem; text-align: center; }
.eyebrow {
  display: inline-block; font-size: var(--text-xs); font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase; color: var(--color-accent);
  margin-bottom: .9rem;
}
.section-title { font-size: var(--text-3xl); font-weight: 800; color: var(--color-primary); line-height: 1.25; letter-spacing: -.5px; }
.section-sub { margin-top: 1rem; color: var(--color-text-muted); font-size: var(--text-lg); }
.section-head.left { margin-left: 0; text-align: left; }

/* ---------- Hero ---------- */
.hero {
  position: relative; color: var(--color-text-inverse);
  background: linear-gradient(115deg, #0a1826 0%, var(--color-primary) 55%, var(--color-primary-soft) 100%);
  overflow: hidden;
}
.hero-media {
  position: absolute; inset: 0;
  background: url("../img/products/hero-screw.jpg") center/cover no-repeat;
  opacity: .28;
  mask-image: linear-gradient(90deg, transparent 0%, rgba(0,0,0,.9) 45%);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, rgba(0,0,0,.9) 45%);
}
.hero-inner { position: relative; padding: 7.5rem 0 8rem; max-width: 640px; }
.hero h1 { font-size: var(--text-5xl); font-weight: 800; line-height: 1.12; letter-spacing: -1px; }
.hero h1 em { font-style: normal; color: var(--color-accent); }
.hero p { margin-top: 1.4rem; font-size: var(--text-lg); color: var(--color-text-inverse-muted); max-width: 540px; }
.hero-actions { margin-top: 2.4rem; display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-stats {
  position: relative; border-top: 1px solid var(--color-border-dark);
  background: rgba(10, 24, 38, .55);
}
.hero-stats-inner {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
  padding: 1.8rem 0;
}
.stat b { display: block; font-size: var(--text-2xl); font-weight: 800; color: #fff; }
.stat b i { font-style: normal; color: var(--color-accent); }
.stat span { font-size: var(--text-xs); color: var(--color-text-inverse-muted); letter-spacing: 1px; text-transform: uppercase; }

/* ---------- Feature cards ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }

.feature-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: 2rem 1.75rem;
  transition: transform .2s, box-shadow .2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-icon {
  width: 52px; height: 52px; border-radius: var(--radius-sm);
  background: #fdf1e6; color: var(--color-accent);
  display: grid; place-items: center; font-size: 1.4rem; margin-bottom: 1.2rem;
}
.feature-card h3 { font-size: var(--text-lg); color: var(--color-primary); margin-bottom: .6rem; }
.feature-card p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ---------- Product cards ---------- */
.product-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); overflow: hidden; transition: transform .2s, box-shadow .2s;
  display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.product-media { aspect-ratio: 4/3; overflow: hidden; background: var(--color-bg-alt); }
.product-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s; }
.product-card:hover .product-media img { transform: scale(1.05); }
.product-body { padding: 1.4rem 1.5rem 1.6rem; flex: 1; display: flex; flex-direction: column; }
.product-body h3 { font-size: var(--text-lg); color: var(--color-primary); margin-bottom: .5rem; }
.product-body p { font-size: var(--text-sm); color: var(--color-text-muted); flex: 1; }
.product-link {
  margin-top: 1.1rem; font-size: var(--text-sm); font-weight: 700;
  color: var(--color-accent); display: inline-flex; align-items: center; gap: .35rem;
}
.product-link:hover { color: var(--color-accent-dark); }

/* ---------- Split sections ---------- */
.split-media img { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.check-list li {
  display: flex; gap: .7rem; align-items: flex-start;
  padding: .55rem 0; font-size: var(--text-base); color: var(--color-text);
}
.check-list li::before {
  content: "✓"; flex: 0 0 auto; width: 22px; height: 22px; border-radius: 50%;
  background: var(--color-accent); color: #fff; font-size: .75rem; font-weight: 800;
  display: grid; place-items: center; margin-top: .25rem;
}

/* ---------- Process timeline ---------- */
.process-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.process-step { position: relative; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 1.5rem 1.25rem; }
.process-num {
  font-size: 2rem; font-weight: 800; color: var(--color-border);
  line-height: 1; margin-bottom: .8rem;
}
.process-step h4 { font-size: var(--text-base); color: var(--color-primary); margin-bottom: .4rem; }
.process-step p { font-size: var(--text-xs); color: var(--color-text-muted); }

/* ---------- CTA band ---------- */
.cta-band { background: linear-gradient(115deg, var(--color-primary) 0%, var(--color-primary-soft) 100%); color: var(--color-text-inverse); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 3.5rem 0; flex-wrap: wrap; }
.cta-inner h2 { font-size: var(--text-2xl); font-weight: 800; letter-spacing: -.3px; }
.cta-inner p { color: var(--color-text-inverse-muted); margin-top: .4rem; }

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  background: linear-gradient(115deg, #0a1826, var(--color-primary));
  color: var(--color-text-inverse); padding: 4.5rem 0 4rem;
}
.page-hero h1 { font-size: var(--text-4xl); font-weight: 800; letter-spacing: -.5px; }
.page-hero p { margin-top: .8rem; color: var(--color-text-inverse-muted); font-size: var(--text-lg); max-width: 620px; }
.breadcrumb { font-size: var(--text-xs); color: var(--color-text-inverse-muted); letter-spacing: 1px; text-transform: uppercase; margin-bottom: 1rem; }
.breadcrumb a:hover { color: var(--color-accent); }

/* ---------- About ---------- */
.about-values .feature-icon { background: #eef3f8; color: var(--color-primary); }
.fact-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 3rem; }
.fact-strip .stat { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 1.5rem; text-align: center; }
.fact-strip .stat b { color: var(--color-primary); font-size: var(--text-3xl); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 3rem; }
.contact-item { display: flex; gap: 1rem; padding: 1.1rem 0; border-bottom: 1px solid var(--color-border); }
.contact-item .feature-icon { width: 44px; height: 44px; font-size: 1.1rem; margin: 0; flex: 0 0 auto; }
.contact-item b { display: block; font-size: var(--text-sm); color: var(--color-primary); }
.contact-item span { font-size: var(--text-sm); color: var(--color-text-muted); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem; }
.form-grid .full { grid-column: 1 / -1; }
.field label { display: block; font-size: var(--text-xs); font-weight: 700; color: var(--color-primary); letter-spacing: .5px; text-transform: uppercase; margin-bottom: .35rem; }
.field input, .field select, .field textarea {
  width: 100%; padding: .75rem .9rem; border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); font: inherit; font-size: var(--text-sm);
  background: var(--color-bg); color: var(--color-text); transition: border .2s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--color-accent); }
.form-note { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: .8rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--color-footer); color: var(--color-text-inverse-muted); padding: 4rem 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 2.5rem; padding-bottom: 3rem; }
.footer-grid h4 { color: #fff; font-size: var(--text-sm); letter-spacing: 1px; text-transform: uppercase; margin-bottom: 1.1rem; }
.footer-grid a { display: block; padding: .3rem 0; font-size: var(--text-sm); transition: color .2s; }
.footer-grid a:hover { color: var(--color-accent); }
.footer-brand p { font-size: var(--text-sm); margin-top: 1rem; max-width: 300px; }
.footer-bottom { border-top: 1px solid var(--color-border-dark); padding: 1.4rem 0; font-size: var(--text-xs); display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem; }

/* ---------- News list ---------- */
.news-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; transition: transform .2s, box-shadow .2s; }
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.news-body { padding: 1.5rem; }
.news-date { font-size: var(--text-xs); color: var(--color-accent); font-weight: 700; letter-spacing: 1px; text-transform: uppercase; }
.news-body h3 { margin: .5rem 0 .6rem; font-size: var(--text-lg); color: var(--color-primary); }
.news-body p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ---------- Login strip ---------- */
.login-strip { font-size: var(--text-xs); color: var(--color-text-muted); display: flex; align-items: center; gap: .9rem; }
.login-strip a { font-weight: 700; color: var(--color-primary); }
.login-strip a:hover { color: var(--color-accent); }

/* ---------- Why-choose split ---------- */
.why-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
.reason-list { margin-top: 1.5rem; }
.reason {
  display: grid; grid-template-columns: 34px 1fr; gap: 1rem;
  padding: 1.1rem 0; border-bottom: 1px dashed var(--color-border);
}
.reason:last-child { border-bottom: 0; }
.reason b {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--color-primary); color: #fff;
  display: grid; place-items: center; font-size: .85rem; font-weight: 800;
}
.reason h4 { font-size: var(--text-base); color: var(--color-primary); margin-bottom: .2rem; }
.reason p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ---------- Workshop gallery ---------- */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.gallery figure { margin: 0; overflow: hidden; border-radius: var(--radius-md); background: var(--color-bg-alt); }
.gallery img { width: 100%; aspect-ratio: 1/1; object-fit: cover; transition: transform .35s; }
.gallery figure:hover img { transform: scale(1.06); }
.gallery figcaption {
  font-size: var(--text-xs); color: var(--color-text-muted);
  padding: .6rem .2rem; text-align: center;
}

/* ---------- Applications ---------- */
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.app-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm); padding: 1.3rem 1.4rem;
}
.app-card h4 { font-size: var(--text-base); color: var(--color-primary); margin-bottom: .35rem; }
.app-card p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ---------- Inquiry (home form) ---------- */
.inquiry { background: var(--color-bg-alt); }
.inquiry-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 3rem; align-items: start; }
.inquiry-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 2rem; box-shadow: var(--shadow-sm);
}
.inquiry-card h3 { font-size: var(--text-xl); color: var(--color-primary); margin-bottom: .4rem; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); margin-bottom: .9rem; overflow: hidden;
}
.faq-item summary {
  cursor: pointer; list-style: none; padding: 1.15rem 1.4rem;
  font-weight: 700; font-size: var(--text-base); color: var(--color-primary);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; flex: 0 0 auto; width: 24px; height: 24px; border-radius: 50%;
  background: #fdf1e6; color: var(--color-accent);
  display: grid; place-items: center; font-size: 1rem; font-weight: 800;
}
.faq-item[open] summary::after { content: "–"; }
.faq-item p {
  padding: 0 1.4rem 1.3rem; font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ---------- Nav dropdown ---------- */
.main-nav li { position: relative; }
.nav-drop {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(6px);
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md); padding: .5rem 0; min-width: 250px;
  opacity: 0; visibility: hidden; transition: .2s; z-index: 60;
}
.main-nav li:hover .nav-drop { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.nav-drop a { display: block; padding: .55rem 1.3rem; font-size: var(--text-sm); font-weight: 600; color: var(--color-text); }
.nav-drop a:hover { background: var(--color-bg-alt); color: var(--color-accent); }
.caret { font-size: .7rem; margin-left: .3rem; }

/* ---------- Spec strip ---------- */
.spec-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem; }
.spec-cell {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: 1.4rem 1rem; text-align: center;
}
.spec-cell b { display: block; font-size: var(--text-xl); color: var(--color-accent); font-weight: 800; }
.spec-cell span { display: block; margin-top: .3rem; font-size: var(--text-xs); color: var(--color-text-muted); letter-spacing: .5px; text-transform: uppercase; }

/* ---------- Brand chips ---------- */
.brand-chips { display: flex; flex-wrap: wrap; gap: .6rem; justify-content: center; }
.brand-chip {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: 999px; padding: .5rem 1.2rem;
  font-size: var(--text-sm); font-weight: 600; color: var(--color-primary);
  transition: .2s;
}
.brand-chip:hover { border-color: var(--color-accent); color: var(--color-accent); }


/* ---------- Category page components ---------- */
.spec-table { width: 100%; border-collapse: collapse; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; }
.spec-table th, .spec-table td { padding: .85rem 1.1rem; text-align: left;
  border-bottom: 1px solid var(--color-border); font-size: var(--text-sm); }
.spec-table thead th { background: var(--color-primary); color: #fff; font-weight: 600; }
.spec-table tbody tr:last-child td { border-bottom: none; }
.spec-table tbody tr:hover { background: var(--color-surface-alt); }
.spec-table td:first-child { font-weight: 600; color: var(--color-primary); white-space: nowrap; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.model-table { width: 100%; border-collapse: collapse; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; }
.model-table th, .model-table td { padding: .8rem 1rem; text-align: left;
  border-bottom: 1px solid var(--color-border); font-size: var(--text-sm); }
.model-table thead th { background: var(--color-surface-alt); color: var(--color-primary); font-weight: 700; }
.model-table tbody tr:last-child td { border-bottom: none; }
.model-table tbody tr:hover { background: var(--color-surface-alt); }
.model-table td { font-variant-numeric: tabular-nums; }

.material-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.material-card { background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1.4rem; }
.material-card h4 { color: var(--color-primary); font-size: var(--text-md); margin-bottom: .4rem; }
.material-card .mat-tag { display: inline-block; background: rgba(232,121,30,.12); color: var(--color-accent);
  font-size: var(--text-xs); font-weight: 700; padding: .2rem .6rem; border-radius: 4px; margin-bottom: .6rem; }
.material-card p { font-size: var(--text-sm); color: var(--color-text-muted); margin: 0; }

.testimonial-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.4rem; }
.testimonial { background: var(--color-surface); border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent); border-radius: var(--radius); padding: 1.5rem; }
.testimonial p { font-size: var(--text-sm); color: var(--color-text); line-height: 1.7; margin-bottom: .9rem; font-style: italic; }
.testimonial .who { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 600; font-style: normal; }
.testimonial .who b { color: var(--color-primary); display: block; font-size: var(--text-sm); }

.variety-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.1rem; }
.variety-card { background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1.3rem; transition: .2s; }
.variety-card:hover { border-color: var(--color-accent); transform: translateY(-2px); }
.variety-card h4 { color: var(--color-primary); font-size: var(--text-sm); margin-bottom: .35rem; }
.variety-card p { font-size: var(--text-xs); color: var(--color-text-muted); margin: 0; line-height: 1.6; }

.pain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.pain-item { background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 1.4rem; }
.pain-item h4 { color: var(--color-primary); font-size: var(--text-md); margin-bottom: .5rem; }
.pain-item h4::before { content: "✕ "; color: #c0392b; font-weight: 700; }
.pain-item p { font-size: var(--text-sm); color: var(--color-text-muted); margin: 0; }
.pain-item .fix { display: block; margin-top: .6rem; font-size: var(--text-sm);
  color: var(--color-primary); font-weight: 600; }
.pain-item .fix::before { content: "✓ "; color: #1e8e3e; }

.cat-hero { background: linear-gradient(135deg, var(--color-primary) 0%, #16324f 100%);
  color: #fff; padding: 3.2rem 0; }
.cat-hero h1 { color: #fff; font-size: var(--text-3xl); margin-bottom: .7rem; }
.cat-hero p { color: rgba(255,255,255,.82); max-width: 780px; margin: 0; line-height: 1.75; }
.cat-hero .breadcrumb { color: rgba(255,255,255,.65); font-size: var(--text-xs); margin-bottom: .9rem; }
.cat-hero .breadcrumb a { color: rgba(255,255,255,.8); }
.cat-trust {
  display: flex; flex-wrap: wrap; gap: 0 2.6rem; margin-top: 1.9rem;
  padding-top: 1.3rem; border-top: 1px solid rgba(255,255,255,.16);
}
.cat-trust span {
  font-size: var(--text-xs); color: rgba(255,255,255,.72);
  letter-spacing: .4px; display: flex; align-items: baseline; gap: .45rem;
}
.cat-trust b { color: var(--color-accent); font-size: var(--text-xl); font-weight: 800; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root { --section-y: 4rem; }
  .hero h1 { font-size: var(--text-4xl); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4, .process-grid, .fact-strip { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .why-grid { grid-template-columns: 1fr; gap: 2.2rem; }
  .inquiry-grid { grid-template-columns: 1fr; gap: 2rem; }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .spec-strip { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .nav-drop {
    position: static; opacity: 1; visibility: visible;
    transform: none; box-shadow: none; border: 0; padding: 0 0 0 1.2rem; min-width: 0;
  }
  .spec-strip { grid-template-columns: repeat(2, 1fr); }
  .cat-trust { gap: .6rem 1.4rem; margin-top: 1.4rem; padding-top: 1rem; }
  .cat-trust span { font-size: 11px; }
  .cat-trust b { font-size: var(--text-base); }
  .main-nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    background: #fff; border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md); padding: 1rem 1.5rem 1.5rem;
    transform: translateY(-130%); transition: transform .3s;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav ul { flex-direction: column; gap: .2rem; }
  .main-nav a { display: block; padding: .7rem 0; font-size: var(--text-base); }
  .nav-toggle { display: block; }
  .header-cta { display: none; }
  .hero-inner { padding: 5rem 0 5.5rem; }
  .hero h1 { font-size: var(--text-3xl); }
  .hero-stats-inner { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .grid-2, .contact-grid, .app-grid { grid-template-columns: 1fr; }
  .grid-4, .process-grid { grid-template-columns: 1fr 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; text-align: center; }
  .section-title { font-size: var(--text-2xl); }
  .page-hero h1 { font-size: var(--text-2xl); }
}
@media (max-width: 480px) {
  .grid-4, .process-grid, .fact-strip { grid-template-columns: 1fr; }
}

/* ---------- Round2: logo / whatsapp / lang / hero-img ---------- */
.brand-logo { height: 46px; width: auto; display: block; }
.brand-logo-w { height: 56px; }
.header-inner { gap: 1.4rem; }
/* ---------- Language selector (self-rendered, no Google script) ---------- */
.lang-sel { position: relative; flex: none; }
.lang-btn { display: inline-flex; align-items: center; gap: .4rem; cursor: pointer;
  background: var(--color-surface); border: 1px solid var(--color-border); color: var(--color-text);
  border-radius: 999px; padding: .42rem .85rem; font-size: .82rem; font-weight: 600;
  font-family: inherit; line-height: 1; transition: border-color .15s, color .15s; }
.lang-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.lang-ico { opacity: .75; }
.lang-sel.open .lang-btn { border-color: var(--color-accent); color: var(--color-accent); }
.lang-sel.open .caret { transform: rotate(180deg); }
.lang-menu { position: absolute; top: calc(100% + 8px); right: 0; width: 260px; z-index: 400;
  background: #fff; border: 1px solid var(--color-border); border-radius: 10px;
  box-shadow: 0 12px 32px rgba(15,35,56,.16); padding: .5rem 0;
  opacity: 0; visibility: hidden; transform: translateY(-6px); transition: opacity .16s, transform .16s, visibility .16s; }
.lang-sel.open .lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu-head { font-size: .68rem; font-weight: 700; letter-spacing: .8px; text-transform: uppercase;
  color: var(--color-text-muted); padding: .35rem 1rem .55rem; border-bottom: 1px solid var(--color-border); }
.lang-menu-list { max-height: 320px; overflow-y: auto; padding: .35rem 0; }
.lang-menu-list a { display: block; padding: .42rem 1rem; font-size: .86rem; color: var(--color-text);
  text-decoration: none; transition: background .12s, color .12s; }
.lang-menu-list a em { font-style: normal; color: var(--color-text-muted); font-size: .78rem; margin-left: .3rem; }
.lang-menu-list a:hover { background: var(--color-bg-alt); color: var(--color-accent); }
.lang-menu-foot { font-size: .7rem; color: var(--color-text-muted); padding: .55rem 1rem .25rem;
  border-top: 1px solid var(--color-border); line-height: 1.35; }
/* 移动端：保留显示，只压缩尺寸 */
@media (max-width: 860px){
  .lang-btn { padding: .35rem .6rem; font-size: .76rem; }
  .lang-menu { width: min(260px, calc(100vw - 32px)); }
}
/* ===== Round 11: vertical floating bar (WhatsApp > WeChat > back-to-top), page middle ===== */
.float-bar { position: fixed; right: 16px; top: 50%; transform: translateY(-50%); z-index: 300;
  display: flex; flex-direction: column; align-items: center; gap: 14px; }
.wa-float { position: relative; flex: 0 0 auto; width: 56px; height: 56px;
  border-radius: 50%; background: #25D366; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 14px rgba(0,0,0,.25); transition: transform .15s; }
.wa-float:hover { transform: scale(1.08); }
@media (max-width: 860px){ .brand-logo{height:38px} .brand-logo-w{height:46px} }

/* ---------- Gallery / hero image ---------- */
.page-hero-img { background-size: cover; background-position: center; }
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.gallery-item { margin: 0; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); overflow: hidden; }
.gallery-item img { width: 100%; height: 210px; object-fit: cover; display: block; }
.gallery-item figcaption { font-size: var(--text-xs); color: var(--color-text-muted); padding: .55rem .8rem; }
@media (max-width: 860px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } .gallery-item img { height: 150px; } }
@media (max-width: 540px) { .gallery-grid { grid-template-columns: 1fr; } .gallery-item img { height: 220px; } }

/* ===== Round 5: featured products / inquiry band / back-to-top ===== */
.prod-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.prod-grid .product-media { aspect-ratio: 4/3; background: #fff; }
.prod-grid .product-media img { object-fit: contain; }
.spec-mini { list-style: none; margin: .8rem 0 1rem; padding: 0; }
.spec-mini li { position: relative; padding: .18rem 0 .18rem 1.3rem; font-size: var(--text-sm); color: var(--color-text-muted); }
.spec-mini li::before { content: "\2713"; position: absolute; left: 0; top: .18rem; color: var(--color-accent); font-weight: 700; }
.card-inquiry { margin-top: auto; align-self: flex-start; }
.inquiry-band { background: linear-gradient(115deg, var(--color-primary) 0%, var(--color-primary-soft) 100%); color: var(--color-text-inverse); padding: 3rem 0; }
.inquiry-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.inquiry-band h2 { color: #fff; margin-bottom: .4rem; font-size: var(--text-2xl); }
.inquiry-band p { color: rgba(255,255,255,.85); max-width: 560px; font-size: var(--text-sm); }
.inquiry-actions { display: flex; gap: .9rem; flex-wrap: wrap; }
.btn-wa { background: #25d366; color: #fff; border: none; }
.btn-wa:hover { background: #1fb855; color: #fff; }
@media (max-width: 860px) { .prod-grid { grid-template-columns: 1fr; } }
.to-top { position: relative; flex: 0 0 auto; width: 46px; height: 46px; border-radius: 50%;
  background: var(--color-primary); color: #fff; border: none; cursor: pointer; box-shadow: 0 4px 14px rgba(0,0,0,.25);
  display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .25s, transform .25s, visibility .25s; }
.to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { background: var(--color-accent); }
@media (max-width: 860px) { .to-top { width: 42px; height: 42px; } }


/* ===== Round 6: language tray + WeChat float + form note ===== */
.lang-menu-list { padding: .3rem 0; }
.lang-menu-list a { display: flex; justify-content: space-between; align-items: baseline; padding: .5rem 1rem; }
.lang-menu-list a[data-native="1"]::after { content: "NEW"; font-size: .58rem; font-weight: 700; letter-spacing: .5px;
  color: var(--color-accent); border: 1px solid currentColor; border-radius: 3px; padding: 0 .25rem; margin-left: .5rem; }
.wx-float { position: relative; flex: 0 0 auto; width: 52px; height: 52px; border-radius: 50%;
  background: #07c160; color: #fff; border: none; cursor: pointer; box-shadow: 0 4px 16px rgba(0,0,0,.26);
  display: flex; align-items: center; justify-content: center; transition: transform .2s, background .2s; }
.wx-float:hover { background: #06ad56; transform: scale(1.06); }
.wx-pop { position: absolute; right: 66px; top: 50%; margin-top: -178px; z-index: 301; width: 246px; opacity: 0; visibility: hidden;
  transform: translateY(6px); transition: opacity .22s, transform .22s, visibility .22s; }
.wx-pop.show { opacity: 1; visibility: visible; transform: translateY(0); }
.wx-pop-inner { position: relative; background: #fff; border-radius: 12px; padding: 1.1rem 1rem;
  box-shadow: 0 10px 34px rgba(0,0,0,.28); text-align: center; }
.wx-pop-inner h4 { margin: 0 0 .7rem; font-size: var(--text-sm); }
.wx-pop-inner img { width: 200px; height: auto; border: 1px solid var(--color-border); border-radius: 8px; }
.wx-pop-inner p { font-size: .74rem; color: var(--color-text-muted); margin: .7rem 0 .25rem; }
.wx-id { font-weight: 700; font-size: var(--text-sm); margin-bottom: .8rem; color: var(--color-primary); }
.wx-pop-x { position: absolute; top: 4px; right: 8px; background: none; border: none; font-size: 1.3rem;
  line-height: 1; color: var(--color-text-muted); cursor: pointer; }
.form-note { background: var(--color-bg-alt); border-left: 3px solid var(--color-accent); border-radius: 6px;
  padding: .8rem 1rem; margin-bottom: 1.4rem; font-size: var(--text-sm); color: var(--color-text-muted); }
.form-note a { color: var(--color-primary); font-weight: 600; }
.wx-inline { color: #07c160; font-weight: 600; }
@media (max-width: 860px) {
  .float-bar { right: 8px; gap: 10px; }
  .wa-float { width: 48px; height: 48px; }
  .wx-float { width: 44px; height: 44px; }
  .wx-pop { right: 58px; width: 210px; margin-top: -160px; }
  .wx-pop-inner img { width: 170px; }
  .to-top { width: 42px; height: 42px; }
}
@media (max-width: 540px) {
  .float-bar { right: 6px; gap: 8px; }
  .wa-float { width: 44px; height: 44px; }
  .wx-float { width: 40px; height: 40px; }
  .wx-pop { right: 52px; width: 200px; }
}


/* ===== Round 7: buyer's guide + intro blocks ===== */
.section-intro { text-align: center; max-width: 720px; margin: 0 auto 2.2rem; color: var(--color-text-muted); }
.lead { font-size: var(--text-lg); line-height: 1.7; color: var(--color-text); }
.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.guide-item { background: #fff; border: 1px solid var(--color-border); border-radius: 10px; padding: 1.4rem 1.5rem; }
.guide-num { display: inline-block; font-weight: 800; font-size: 1.1rem; color: var(--color-accent); margin-bottom: .4rem; }
.guide-item h3 { font-size: var(--text-base); margin: 0 0 .6rem; }
.guide-item p { font-size: var(--text-sm); color: var(--color-text-muted); margin: 0 0 .5rem; }
.guide-ours { color: var(--color-text); border-left: 3px solid var(--color-accent); padding-left: .8rem; background: var(--color-bg-alt); }
.guide-redflags { list-style: none; counter-reset: rf; padding: 0; }
.guide-redflags li { position: relative; padding: .85rem 0 .85rem 3rem; border-bottom: 1px dashed var(--color-border); font-size: var(--text-sm); color: var(--color-text-muted); }
.guide-redflags li::before { counter-increment: rf; content: counter(rf); position: absolute; left: 0; top: .85rem;
  width: 1.9rem; height: 1.9rem; border-radius: 50%; background: #c0392b; color: #fff; font-weight: 700; font-size: .8rem;
  display: flex; align-items: center; justify-content: center; }
.stat-card { background: #fff; border: 1px solid var(--color-border); border-radius: 10px; padding: 1.6rem 1rem; text-align: center; }
.stat-num { display: block; font-size: 1.9rem; font-weight: 800; color: var(--color-primary); line-height: 1.1; }
.stat-label { display: block; font-size: .78rem; color: var(--color-text-muted); margin-top: .4rem; }
@media (max-width: 860px) { .guide-grid { grid-template-columns: 1fr; } }

/* ===== Product detail pages (36 individual product URLs) ===== */
.prod-main { display: grid; grid-template-columns: 1.05fr 1fr; gap: 2.5rem; align-items: start; }
.prod-main-media { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.2rem; }
.prod-main-media img { width: 100%; height: auto; display: block; object-fit: contain; }
.prod-main-body h2 { margin: .3rem 0 .9rem; font-size: var(--text-2xl); }
.prod-main-body .lead { font-size: 1.02rem; color: var(--color-text); }
.prod-main-body p { margin-bottom: 1rem; }
.prod-cta { display: flex; gap: .8rem; flex-wrap: wrap; margin: 1.4rem 0 .8rem; }
.prod-note { font-size: var(--text-sm); color: var(--color-text-muted); margin: 0; }
.app-list { columns: 2; column-gap: 2rem; max-width: 900px; }
.app-list li { break-inside: avoid; font-size: 1rem; color: var(--color-text); padding: .3rem 0 .3rem 1.5rem; }
.back-link { margin-top: 1.8rem; }
.back-link a { color: var(--color-accent); font-weight: 600; }
.product-card h3 a { color: inherit; text-decoration: none; }
.product-card h3 a:hover { color: var(--color-accent); }
@media (max-width: 900px) {
  .prod-main { grid-template-columns: 1fr; gap: 1.6rem; }
  .app-list { columns: 1; }
}

/* two-button card footer on category pages */
.card-actions { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: auto; }
.prod-grid .product-card, .grid-3 .product-card, .grid-4 .product-card { display: flex; flex-direction: column; }
.prod-grid .product-body, .grid-3 .product-body, .grid-4 .product-body { display: flex; flex-direction: column; flex: 1; }


/* ===== Round 10: 4-column product grid + More Products ===== */
.prod-grid.cols-4 { grid-template-columns: repeat(4, 1fr); gap: 1.2rem; }
.prod-grid.cols-4 .product-media { aspect-ratio: 4/3; background: #fff; }
.prod-grid.cols-4 .product-media img { object-fit: contain; }
.prod-grid.cols-4 .product-body h3 { font-size: 1.02rem; line-height: 1.35; }
.prod-grid.cols-4 .product-body h3 a { color: inherit; text-decoration: none; }
.prod-grid.cols-4 .product-body h3 a:hover { color: var(--color-accent); }
.prod-grid.cols-4 .product-body p { font-size: .88rem; color: var(--color-text-muted); margin: .4rem 0 .8rem; }
.prod-grid.cols-4 .card-actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: auto; }
.more-products { text-align: center; margin-top: 2.2rem; }
.more-products .more-note { margin-top: .6rem; font-size: var(--text-sm); color: var(--color-text-muted); }
@media (max-width: 1080px) { .prod-grid.cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .prod-grid.cols-4 { grid-template-columns: 1fr; } }

/* ===== Round 11: news article pages ===== */
.news-card-link { display: block; color: inherit; text-decoration: none; }
.news-card-link:hover h3 { color: var(--color-accent); }
.news-more { display: inline-block; margin-top: .7rem; color: var(--color-accent); font-weight: 600; font-size: var(--text-sm); }
.article-wrap { max-width: 820px; margin: 0 auto; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; margin-bottom: 1.1rem;
  font-size: var(--text-xs); color: var(--color-text-muted); }
.article-tag { background: var(--color-bg-alt); border: 1px solid var(--color-border); border-radius: 20px;
  padding: .18rem .7rem; font-weight: 600; color: var(--color-primary); }
.article-wrap .lead { margin-bottom: 1.4rem; }
.article-img { width: 100%; height: auto; border-radius: var(--radius-md); border: 1px solid var(--color-border);
  display: block; margin: 0 0 1.6rem; }
.article-wrap h2 { margin: 2.1rem 0 .8rem; font-size: var(--text-xl); }
.article-wrap p { margin-bottom: 1rem; line-height: 1.8; }
.article-wrap ul { margin: 0 0 1.2rem 1.1rem; }
.article-wrap li { margin-bottom: .5rem; line-height: 1.7; }
.article-box { background: var(--color-bg-alt); border-left: 3px solid var(--color-accent); border-radius: 6px;
  padding: 1rem 1.2rem; margin: 1.6rem 0; font-size: var(--text-sm); }
.article-related { margin-top: 2.4rem; padding-top: 1.4rem; border-top: 1px solid var(--color-border); }
.article-related h2 { margin-top: 0; font-size: var(--text-lg); }
.article-related a { display: inline-block; margin: 0 .9rem .5rem 0; color: var(--color-primary); font-weight: 600; }
.article-cta { display: flex; gap: .8rem; flex-wrap: wrap; margin-top: 2rem; }

.resin-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .7rem; }
.resin-chip { display: block; padding: .9rem 1rem; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-sm, 6px); font-size: var(--text-sm); font-weight: 600; color: var(--color-primary); text-decoration: none; transition: .2s; }
.resin-chip:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.glossary-item { padding: 1.1rem 0; border-bottom: 1px solid var(--color-border); }
.glossary-item:last-child { border-bottom: none; }
.glossary-item h3 { margin: 0 0 .35rem; font-size: var(--text-lg); color: var(--color-primary); }
.glossary-item p { margin: 0; color: var(--color-text-muted); }
@media (max-width: 900px) { .resin-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .resin-grid { grid-template-columns: 1fr; } }