/* ============================================
   安徽柏威工业 - 官网设计系统
   Industrial Business Style · Signature Red
   红色工业商务风 (LOGO 红 + 炭黑 + 银灰 + 金)
   ============================================ */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* Brand colors - Industrial Signature Red */
  --c-primary: #c8102e;        /* signature red */
  --c-primary-dark: #8b0a1f;   /* deep red */
  --c-primary-light: #e11d2a;  /* bright red */
  --c-accent: #1a1a1a;         /* carbon black (CTA contrast) */
  --c-accent-dark: #000000;
  --c-gold: #f5b800;           /* gold highlight for numbers */

  /* Neutrals */
  --c-ink: #14181f;            /* main text */
  --c-ink-2: #3d4754;          /* secondary text */
  --c-ink-3: #6b7689;          /* muted text */
  --c-line: #e3e6ec;           /* borders */
  --c-bg: #ffffff;
  --c-bg-soft: #f5f6f9;        /* soft section bg */
  --c-bg-dark: #15181f;        /* dark section bg */

  /* Effects */
  --shadow-sm: 0 1px 3px rgba(20, 24, 31, 0.08);
  --shadow-md: 0 6px 20px rgba(20, 24, 31, 0.10);
  --shadow-lg: 0 14px 40px rgba(20, 24, 31, 0.16);
  --shadow-red: 0 10px 30px rgba(200, 16, 46, 0.28);

  /* Layout */
  --container: 1240px;
  --header-h: 76px;
  --radius: 6px;
  --radius-lg: 14px;

  /* Type */
  --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  --font-en: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-ink);
  background: var(--c-bg);
  overflow-x: hidden;
}
[lang="en"] body, body[lang="en"] { font-family: var(--font-en); }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-primary); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* ---------- 3. Layout helpers ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 90px 0; }
.section--soft { background: var(--c-bg-soft); }
.section--dark { background: var(--c-bg-dark); color: #fff; }
.section--primary { background: linear-gradient(135deg, var(--c-primary-dark), var(--c-primary)); color: #fff; }

.section-head { text-align: center; max-width: 760px; margin: 0 auto 56px; }
.section-head .eyebrow {
  display: inline-block;
  font-size: 13px; font-weight: 600; letter-spacing: 3px; text-transform: uppercase;
  color: var(--c-primary); margin-bottom: 14px;
  position: relative; padding-left: 38px;
}
.section-head .eyebrow::before {
  content: ""; position: absolute; left: 0; top: 50%;
  width: 28px; height: 2px; background: var(--c-primary);
}
.section--dark .section-head .eyebrow,
.section--primary .section-head .eyebrow { color: #ffb8c2; }
.section--dark .section-head .eyebrow::before,
.section--primary .section-head .eyebrow::before { background: #ffb8c2; }

.section-head h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800; line-height: 1.25;
  margin-bottom: 16px; letter-spacing: -0.5px;
}
.section--dark .section-head h2, .section--primary .section-head h2 { color: #fff; }
.section-head p {
  font-size: 17px; color: var(--c-ink-2); line-height: 1.7;
}
.section--dark .section-head p, .section--primary .section-head p { color: rgba(255,255,255,0.78); }

/* ---------- 4. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 30px; font-size: 15px; font-weight: 600;
  border-radius: var(--radius); cursor: pointer;
  transition: all var(--transition); white-space: nowrap;
  border: 2px solid transparent;
}
.btn--primary { background: var(--c-primary); color: #fff; }
.btn--primary:hover { background: var(--c-primary-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-red); }
.btn--accent { background: var(--c-accent); color: #fff; }
.btn--accent:hover { background: var(--c-accent-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn--ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,0.5); }
.btn--ghost:hover { background: #fff; color: var(--c-primary); border-color: #fff; }
.btn--outline { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
.btn--outline:hover { background: var(--c-primary); color: #fff; }
.btn--lg { padding: 16px 38px; font-size: 16px; }

/* ---------- 5. Header / Navigation ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-h);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-line);
  transition: all var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }
.site-header .container {
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img.logo { height: 64px; width: auto; transition: var(--transition); }
.brand:hover img.logo { transform: scale(1.02); }
.footer-brand .brand img.logo { height: 68px; }
/* Hidden helper for brand text (only used if logo image fails to load) */
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text .name { font-size: 17px; font-weight: 800; color: var(--c-primary); letter-spacing: 0.5px; }
.brand-text .sub { font-size: 11px; color: var(--c-ink-3); letter-spacing: 1.5px; text-transform: uppercase; }

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 10px 16px; font-size: 15px; font-weight: 500; color: var(--c-ink);
  border-radius: var(--radius); position: relative;
}
.main-nav a:hover { color: var(--c-primary); background: rgba(200, 16, 46, 0.06); }
.main-nav a.active { color: var(--c-primary); }
.main-nav a.active::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 2px;
  height: 2px; background: var(--c-primary);
}

.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 12px; border: 1px solid var(--c-line); border-radius: 20px;
  font-size: 13px; font-weight: 600;
}
.lang-switch a { padding: 2px 8px; border-radius: 12px; color: var(--c-ink-3); }
.lang-switch a.active { background: var(--c-primary); color: #fff; }

.nav-toggle { display: none; width: 40px; height: 40px; flex-direction: column; justify-content: center; align-items: center; gap: 5px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--c-ink); transition: var(--transition); }
.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); }

	/* ---------- 6. Footer ---------- */
	.site-footer { background: #f0f2f5; color: var(--c-ink-2); padding: 70px 0 0; }
	.footer-grid {
	  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 48px;
	  padding-bottom: 50px; border-bottom: 1px solid var(--c-line);
	}
	.footer-brand .brand { margin-bottom: 18px; }
	.footer-brand .brand-text .name { color: var(--c-ink); }
	.footer-brand p { font-size: 14px; line-height: 1.8; color: var(--c-ink-2); }
	.footer-col h4 { color: var(--c-ink); font-size: 16px; margin-bottom: 20px; font-weight: 700; }
	.footer-col li { margin-bottom: 11px; }
	.footer-col a { font-size: 14px; color: var(--c-ink-3); }
	.footer-col a:hover { color: var(--c-primary); }
	.footer-contact li { display: flex; gap: 10px; margin-bottom: 14px; font-size: 14px; color: var(--c-ink-2); }
	.footer-contact .ico { color: var(--c-primary); flex-shrink: 0; margin-top: 3px; }
	.footer-bottom {
	  padding: 22px 0; display: flex; justify-content: space-between; align-items: center;
	  font-size: 13px; color: var(--c-ink-3);
	}
	.footer-bottom a { color: var(--c-ink-3); }
	.footer-bottom a:hover { color: var(--c-primary); }

/* ---------- 7. Hero ---------- */
.hero {
  position: relative; min-height: 92vh; padding: calc(var(--header-h) + 60px) 0 80px;
  display: flex; align-items: center; overflow: hidden;
	background: linear-gradient(135deg, #15181f, #8b0a1f 60%, #c8102e);
  color: #fff;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 80% 20%, rgba(200, 16, 46, 0.35), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(245, 184, 0, 0.12), transparent 50%);
}
.hero::after {
  content: ""; position: absolute; right: -100px; bottom: -100px;
  width: 500px; height: 500px;
  border: 2px solid rgba(255,255,255,0.06); border-radius: 50%;
}
.hero .container { position: relative; z-index: 2; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 60px; align-items: center; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 18px; background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2);
  border-radius: 30px; font-size: 13px; font-weight: 600; letter-spacing: 1.5px;
  margin-bottom: 26px;
}
.hero-eyebrow .dot { width: 8px; height: 8px; background: var(--c-gold); border-radius: 50%; box-shadow: 0 0 12px var(--c-gold); }
.hero h1 {
  font-size: clamp(34px, 5.5vw, 60px); font-weight: 900; line-height: 1.1;
  letter-spacing: -1px; margin-bottom: 24px;
}
.hero h1 .hl { color: #fff; }
.hero h1 .hl-red { color: #fff; }
.hero .lead { font-size: 18px; line-height: 1.8; color: rgba(255,255,255,0.85); margin-bottom: 36px; max-width: 560px; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 38px; margin-top: 56px; padding-top: 36px; border-top: 1px solid rgba(255,255,255,0.15); }
.hero-stat .num { font-size: 36px; font-weight: 800; color: var(--c-gold); line-height: 1; }
.hero-stat .lbl { font-size: 13px; color: rgba(255,255,255,0.7); margin-top: 8px; letter-spacing: 1px; }
.hero-visual { position: relative; }
.hero-visual .main-img {
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
  aspect-ratio: 4/3; background: #2a0a14;
  border: 1px solid rgba(255,255,255,0.1);
}
.hero-visual .main-img img { width: 100%; height: 100%; object-fit: cover; }
.hero-visual .floating-card {
  position: absolute; padding: 16px 22px; background: rgba(255,255,255,0.97);
  border-radius: 12px; box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 12px;
}
.hero-visual .floating-card .ico {
  width: 42px; height: 42px; border-radius: 10px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
  display: flex; align-items: center; justify-content: center; color: #fff;
}
.hero-visual .floating-card .t { font-size: 13px; color: var(--c-ink-3); }
.hero-visual .floating-card .v { font-size: 17px; font-weight: 800; color: var(--c-ink); }
.hero-visual .fc-1 { bottom: 30px; left: -30px; }
.hero-visual .fc-2 { top: 30px; right: -30px; }

/* ---------- 8. Cards / Grid ---------- */
.grid { display: grid; gap: 28px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.feature-card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius-lg);
  padding: 36px 30px; transition: all var(--transition); position: relative; overflow: hidden;
}
.feature-card::before {
  content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-primary-light));
  transform: scaleX(0); transform-origin: left; transition: transform var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-card:hover::before { transform: scaleX(1); }
.feature-card .ico {
  width: 60px; height: 60px; border-radius: 14px; margin-bottom: 22px;
  background: linear-gradient(135deg, rgba(200,16,46,0.1), rgba(225,29,42,0.1));
  color: var(--c-primary); display: flex; align-items: center; justify-content: center;
}
.feature-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; color: var(--c-ink); }
.feature-card p { font-size: 15px; color: var(--c-ink-2); line-height: 1.75; }
.feature-card .num-tag {
  position: absolute; top: 22px; right: 26px; font-size: 56px; font-weight: 900;
  color: var(--c-bg-soft); line-height: 1; z-index: 0;
}

/* Product card */
.product-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: all var(--transition);
  border: 1px solid var(--c-line);
}
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.product-card .img-wrap { aspect-ratio: 4/3; overflow: hidden; background: var(--c-bg-soft); position: relative; }
.product-card .img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.product-card:hover .img-wrap img { transform: scale(1.08); }
.product-card .img-wrap .tag {
  position: absolute; top: 14px; left: 14px;
  padding: 5px 12px; background: rgba(200,16,46,0.92); color: #fff;
  font-size: 12px; font-weight: 600; border-radius: 4px; letter-spacing: 0.5px;
}
.product-card .body { padding: 22px 24px 26px; }
.product-card .body h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: var(--c-ink); }
.product-card .body p { font-size: 14px; color: var(--c-ink-2); line-height: 1.6; }
.product-card .body .more {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 14px;
  font-size: 14px; font-weight: 600; color: var(--c-primary);
}

/* ---------- 9. Page hero (inner pages) ---------- */
.page-hero {
  padding: calc(var(--header-h) + 70px) 0 60px;
  background: linear-gradient(135deg, #15181f, #8b0a1f 60%, #c8102e);
  color: #fff; text-align: center; position: relative; overflow: hidden;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 30% 50%, rgba(245,184,0,0.12), transparent 50%);
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(30px, 4.5vw, 46px); font-weight: 800; margin-bottom: 14px; }
.page-hero p { font-size: 17px; color: rgba(255,255,255,0.85); max-width: 640px; margin: 0 auto; }
.breadcrumb { margin-top: 22px; font-size: 13px; color: rgba(255,255,255,0.6); }
.breadcrumb a { color: rgba(255,255,255,0.85); }
.breadcrumb a:hover { color: var(--c-gold); }
.breadcrumb span { margin: 0 8px; }

/* ---------- 10. Stats bar ---------- */
.stats-bar {
  background: var(--c-bg-dark); color: #fff; padding: 50px 0;
  position: relative; overflow: hidden;
}
.stats-bar::before {
  content: ""; position: absolute; left: 0; top: 0; width: 6px; height: 100%;
  background: linear-gradient(180deg, var(--c-primary), var(--c-gold));
}
.stats-bar .grid { grid-template-columns: repeat(4, 1fr); }
.stat-item { text-align: center; padding: 0 14px; position: relative; }
.stat-item:not(:last-child)::after {
  content: ""; position: absolute; right: 0; top: 15%; height: 70%;
  width: 1px; background: rgba(255,255,255,0.15);
}
.stat-item .num { font-size: 42px; font-weight: 800; color: var(--c-gold); line-height: 1; }
.stat-item .num .unit { font-size: 22px; margin-left: 2px; }
.stat-item .lbl { font-size: 14px; color: rgba(255,255,255,0.75); margin-top: 10px; }

/* ---------- 11. CTA band ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--c-primary-dark), var(--c-primary));
  color: #fff; padding: 70px 0; position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; right: -50px; top: -50px;
  width: 300px; height: 300px; border: 2px solid rgba(255,255,255,0.08); border-radius: 50%;
}
.cta-band::after {
  content: ""; position: absolute; left: -80px; bottom: -80px;
  width: 220px; height: 220px; border: 2px solid rgba(245,184,0,0.15); border-radius: 50%;
}
.cta-band .container { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.cta-band h2 { font-size: clamp(26px, 3.5vw, 36px); font-weight: 800; margin-bottom: 10px; }
.cta-band p { color: rgba(255,255,255,0.85); font-size: 16px; }

/* ---------- 12. Tables ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.spec-table th, .spec-table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--c-line); }
.spec-table th { background: var(--c-bg-soft); font-weight: 700; color: var(--c-ink); width: 32%; }
.spec-table td { color: var(--c-ink-2); }
.spec-table tr:last-child td, .spec-table tr:last-child th { border-bottom: none; }

/* ---------- 13. Filter tabs ---------- */
.filter-tabs { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }
.filter-tabs button {
  padding: 10px 22px; font-size: 14px; font-weight: 600;
  border: 1px solid var(--c-line); border-radius: 30px; color: var(--c-ink-2);
  transition: var(--transition);
}
.filter-tabs button:hover { border-color: var(--c-primary); color: var(--c-primary); }
.filter-tabs button.active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* ---------- 14. Comparison table ---------- */
.compare { width: 100%; border-collapse: collapse; }
.compare th, .compare td { padding: 18px 20px; text-align: center; border: 1px solid var(--c-line); }
.compare thead th { background: var(--c-primary); color: #fff; font-weight: 700; font-size: 16px; }
.compare thead th:first-child { background: var(--c-bg-dark); }
.compare tbody th { background: var(--c-bg-soft); text-align: left; font-weight: 700; color: var(--c-ink); width: 22%; }
.compare .yes { color: #16a34a; font-weight: 700; }
.compare .no { color: #dc2626; font-weight: 700; }

/* ---------- 15. Timeline ---------- */
.timeline { position: relative; padding-left: 40px; }
.timeline::before { content: ""; position: absolute; left: 10px; top: 8px; bottom: 8px; width: 2px; background: var(--c-line); }
.timeline-item { position: relative; padding-bottom: 36px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ""; position: absolute; left: -36px; top: 4px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--c-primary); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--c-primary);
}
.timeline-item .year { font-size: 18px; font-weight: 800; color: var(--c-primary); margin-bottom: 6px; }
.timeline-item h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.timeline-item p { font-size: 14px; color: var(--c-ink-2); }

/* ---------- 16. Contact page ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 50px; }
.contact-info-card {
  background: linear-gradient(135deg, var(--c-primary-dark), var(--c-primary));
  color: #fff; padding: 44px 38px; border-radius: var(--radius-lg);
}
.contact-info-card h3 { font-size: 24px; font-weight: 800; margin-bottom: 8px; }
.contact-info-card .sub { color: rgba(255,255,255,0.8); margin-bottom: 32px; }
.contact-info-card li { display: flex; gap: 16px; margin-bottom: 26px; }
.contact-info-card .ico {
  width: 46px; height: 46px; border-radius: 12px; flex-shrink: 0;
  background: rgba(255,255,255,0.12); display: flex; align-items: center; justify-content: center;
}
.contact-info-card .lbl { font-size: 13px; color: rgba(255,255,255,0.7); margin-bottom: 4px; }
.contact-info-card .val { font-size: 16px; font-weight: 600; }
.contact-form {
  background: #fff; padding: 40px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md); border: 1px solid var(--c-line);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--c-ink); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; font-size: 15px; font-family: inherit;
  border: 1px solid var(--c-line); border-radius: var(--radius); transition: var(--transition);
  background: #fff;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(200,16,46,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ---------- 17. Animations ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.floating { animation: float 4s ease-in-out infinite; }

/* ---------- 18. Utilities ---------- */
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.mb-0 { margin-bottom: 0; }
.bg-soft { background: var(--c-bg-soft); }
.tag {
  display: inline-block; padding: 4px 12px; font-size: 12px; font-weight: 600;
  background: rgba(200,16,46,0.08); color: var(--c-primary); border-radius: 20px;
}

/* ---------- 19. Responsive ---------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .intro-grid,
  [style*="grid-template-columns:1fr 1fr"] { grid-template-columns: 1fr !important; gap: 30px !important; }
}
@media (max-width: 768px) {
  :root { --header-h: 64px; }
  .section { padding: 60px 0; }
  .container { padding: 0 18px; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 20px; gap: 0; box-shadow: var(--shadow-lg);
    transform: translateY(-150%); transition: transform 0.4s ease; height: auto;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav a { padding: 14px 16px; border-bottom: 1px solid var(--c-line); border-radius: 0; }
  .main-nav a.active::after { display: none; }
  .nav-toggle { display: flex; }
  .header-actions .btn { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stats-bar .grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .stat-item:nth-child(2)::after { display: none; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
  .cta-band .container { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .section-head { margin-bottom: 36px; }
  .compare { font-size: 13px; }
  .compare th, .compare td { padding: 12px 10px; }
  .hero h1 { font-size: 28px; }
  .hero .lead { font-size: 15px; }
  .hero-cta { flex-direction: column; }
  .hero-cta .btn { width: 100%; text-align: center; }
  img { height: auto; }
  table, .spec-table, .compare { display: block; overflow-x: auto; }
  .page-hero { padding: calc(var(--header-h) + 40px) 0 36px; }
  .page-hero h1 { font-size: 26px; }
  .article-detail { padding: 0; }
  .article-header h1 { font-size: 22px; }
  .article-body { font-size: 15px; }
}