/* ===========================================================
   格律斯五金 GELVSIM — 官网样式
   深钢灰车间风格 + 工业橙信号色
   =========================================================== */

:root {
  --bg: #1a1d21;
  --bg-deep: #14171a;
  --bg-alt: #17191c;
  --card: #1f2226;
  --card-hi: #23272c;
  --line: #262b31;
  --line-soft: #32373d;
  --text: #ffffff;
  --text-2: #c9ced6;
  --text-3: #b8bec6;
  --muted: #8a919b;
  --dim: #5a626c;
  --accent: #f26522;
  --accent-soft: #ffe3d6;
  --radius: 4px;
  --maxw: 1200px;
  --gutter: 48px;
  --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", sans-serif;
  --font-en: "Barlow", "Helvetica Neue", Arial, var(--font-cn);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text-3);
  font-family: var(--font-en);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

html[lang="zh-CN"] body { font-family: var(--font-cn); }

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: var(--accent); color: #fff; }

.skip {
  position: absolute; top: -60px; left: 16px; z-index: 999;
  background: var(--accent); color: #fff; padding: 10px 18px; border-radius: var(--radius);
  transition: top 0.2s;
}
.skip:focus { top: 12px; }

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 15px 34px; border-radius: 4px;
  font-size: 15px; font-weight: 600; letter-spacing: 0.01em;
  transition: transform 0.25s var(--ease), background 0.25s, border-color 0.25s, box-shadow 0.25s;
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #ff7733; transform: translateY(-2px); box-shadow: 0 10px 30px -10px rgba(242, 101, 34, 0.7); }
.btn-ghost { border: 1px solid var(--line-soft); color: var(--text-2); }
.btn-ghost:hover { border-color: var(--accent); color: #fff; transform: translateY(-2px); }
.btn-white { background: #fff; color: #1a1d21; }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 12px 30px -12px rgba(0,0,0,0.5); }

/* ---------- 顶栏 ---------- */
.topbar {
  background: var(--bg-deep);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}
.topbar .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 44px; gap: 24px;
}
.topbar-left { display: flex; align-items: center; gap: 22px; min-width: 0; }
.topbar-left a { display: inline-flex; align-items: center; gap: 7px; transition: color 0.2s; }
.topbar-left a:hover { color: var(--text); }
.topbar svg { width: 13px; height: 13px; flex: none; opacity: 0.7; }
.topbar-tel svg { width: 14px; height: 14px; opacity: 0.9; }
.topbar-right { display: flex; align-items: center; gap: 22px; flex: none; }
.topbar-tel { color: var(--text-3); display: inline-flex; align-items: center; gap: 7px; }
.topbar-tel b { font-family: var(--font-en); font-weight: 600; letter-spacing: 0.02em; color: #fff; }

.lang { display: inline-flex; align-items: center; gap: 7px; font-family: var(--font-en); font-size: 13px; }
.lang a { color: var(--muted); transition: color 0.2s; }
.lang a:hover { color: #fff; }
.lang .on { color: var(--accent); font-weight: 600; }
.lang .sep { color: #3a4048; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(26, 29, 33, 0.94);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.3s, background 0.3s;
}
.nav.scrolled { box-shadow: 0 1px 24px rgba(0, 0, 0, 0.55); background: rgba(20, 23, 26, 0.97); }
.nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 76px; gap: 32px;
}

.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 2px;
  background: var(--accent); color: #fff;
  display: grid; place-items: center;
  font-family: var(--font-cn); font-size: 22px; font-weight: 800; line-height: 1;
  flex: none;
}
.brand-text { display: flex; flex-direction: column; gap: 1px; }
.brand-name { font-size: 19px; font-weight: 700; color: #fff; letter-spacing: 0.02em; line-height: 1.25; }
.brand-sub {
  font-family: var(--font-en); font-size: 10.5px; letter-spacing: 0.16em;
  color: var(--muted); text-transform: uppercase; line-height: 1.3;
}

.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 15px; color: var(--text-2); position: relative; padding: 4px 0;
  transition: color 0.2s;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px;
  width: 0; height: 2px; background: var(--accent); transition: width 0.28s var(--ease);
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--accent); font-weight: 600; }

.nav-cta { flex: none; padding: 12px 26px; font-size: 15px; }

.burger {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line-soft);
  border-radius: var(--radius); place-items: center; flex: none;
}
.burger span { display: block; width: 18px; height: 1.5px; background: #fff; position: relative; transition: 0.25s; }
.burger span::before, .burger span::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 1.5px; background: #fff; transition: 0.25s;
}
.burger span::before { top: -6px; }
.burger span::after { top: 6px; }
.nav.open .burger span { background: transparent; }
.nav.open .burger span::before { top: 0; transform: rotate(45deg); }
.nav.open .burger span::after { top: 0; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 30% 30%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 30% 30%, #000 20%, transparent 75%);
}
.hero .wrap {
  position: relative;
  display: grid; grid-template-columns: 1.05fr 0.95fr;
  gap: 64px; align-items: center;
  padding-top: 84px; padding-bottom: 88px;
}

.badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 8px 16px; border-radius: 100px;
  background: var(--card-hi); color: var(--text-3);
  font-size: 13px; margin-bottom: 26px;
  border: 1px solid rgba(255,255,255,0.04);
}
.badge i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); flex: none; }

.hero h1 {
  font-size: clamp(34px, 4.1vw, 56px);
  line-height: 1.12; font-weight: 700; color: #fff;
  letter-spacing: -0.01em; margin-bottom: 24px;
}
.hero h1 em { font-style: normal; color: var(--accent); }

.hero-sub {
  font-size: 16px; line-height: 1.75; color: var(--text-3);
  max-width: 560px; margin-bottom: 34px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }

.stats { display: flex; gap: 0; flex-wrap: wrap; }
.stat { padding: 18px 34px 0 0; margin-right: 34px; border-left: 0; }
.stat + .stat { padding-left: 34px; margin-right: 0; border-left: 1px solid var(--line-soft); }
.stat-rule { display: block; width: 28px; height: 3px; background: var(--accent); margin-bottom: 14px; }
.stat-num {
  font-family: var(--font-en); font-size: 32px; font-weight: 600; color: #fff;
  line-height: 1.1; letter-spacing: -0.01em;
}
.stat-label { font-size: 13px; color: var(--muted); margin-top: 6px; }

.hero-media {
  position: relative; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line-soft);
  aspect-ratio: 520 / 480;
  background: var(--card-hi);
}
.hero-media img { width: 100%; height: 100%; object-fit: cover; }
.hero-media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(20,23,26,0.1) 0%, rgba(20,23,26,0.55) 100%);
  pointer-events: none;
}
.hero-tag {
  position: absolute; left: 18px; bottom: 18px; z-index: 2;
  display: flex; align-items: center; gap: 10px;
  background: rgba(20, 23, 26, 0.86); backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 100px; padding: 8px 16px 8px 12px;
  font-size: 12px; color: var(--text-2); letter-spacing: 0.04em;
}
.hero-tag b { color: var(--accent); font-family: var(--font-en); font-weight: 600; }

/* ---------- 通用 section ---------- */
section { position: relative; }
.sec { padding: 88px 0; }
.sec-alt { background: var(--bg-alt); }
.sec-deep { background: var(--bg-deep); }
.sec-line { border-bottom: 1px solid var(--line); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-en); font-size: 12.5px; font-weight: 600;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent);
  margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 20px; height: 2px; background: var(--accent); }

.sec-title {
  font-size: clamp(26px, 2.9vw, 38px); line-height: 1.22; font-weight: 700;
  color: #fff; letter-spacing: -0.01em;
}
.sec-sub { font-size: 15px; color: var(--muted); margin-top: 12px; max-width: 680px; }

.sec-head { margin-bottom: 44px; }
.sec-head--row {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 32px; flex-wrap: wrap; margin-bottom: 44px;
}
.sec-head--row .sec-sub { margin-bottom: 4px; }

/* ---------- 关于我们 ---------- */
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center;
}
.about-media {
  position: relative; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line-soft); aspect-ratio: 520 / 380;
  background: var(--card-hi);
}
.about-media img { width: 100%; height: 100%; object-fit: cover; }
.about-media .stamp {
  position: absolute; top: 16px; left: 16px;
  background: var(--accent); color: #fff;
  font-family: var(--font-en); font-size: 11px; font-weight: 600;
  letter-spacing: 0.14em; padding: 6px 12px; border-radius: 2px;
}

.about-body p { font-size: 15px; line-height: 1.85; color: var(--text-3); margin-bottom: 18px; }
.about-body p:last-of-type { margin-bottom: 28px; }
.about-body strong { color: #fff; font-weight: 600; }

.info-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.info-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 20px;
  transition: border-color 0.25s, transform 0.25s var(--ease);
}
.info-card:hover { border-color: var(--line-soft); transform: translateY(-2px); }
.info-card dt {
  font-size: 12px; color: var(--muted); margin-bottom: 6px; letter-spacing: 0.02em;
}
.info-card dd {
  font-family: var(--font-en); font-size: 15px; font-weight: 600; color: #fff; line-height: 1.45;
}
html[lang="zh-CN"] .info-card dd { font-family: var(--font-cn); }

/* ---------- 服务 ---------- */
.svc-grid { display: grid; gap: 16px; }
.svc-row { display: grid; gap: 16px; grid-template-columns: 1.35fr 1fr; }
.svc-row--b { grid-template-columns: 1fr 1.35fr; }

.svc {
  display: flex; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  transition: border-color 0.3s, transform 0.3s var(--ease), background 0.3s;
}
.svc:hover { border-color: #3a4048; transform: translateY(-3px); background: #212528; }
.svc-body { padding: 30px 32px; display: flex; flex-direction: column; flex: 1; min-width: 0; }
.svc-num {
  font-family: var(--font-en); font-size: 13px; font-weight: 600;
  letter-spacing: 0.18em; color: var(--accent); margin-bottom: 12px;
}
.svc h3 { font-size: 24px; font-weight: 700; color: #fff; line-height: 1.3; margin-bottom: 10px; }
.svc p { font-size: 14px; line-height: 1.75; color: var(--text-3); }
.svc-media { width: 40%; flex: none; position: relative; overflow: hidden; background: var(--card-hi); }
.svc-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease); }
.svc:hover .svc-media img { transform: scale(1.05); }

.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.pill {
  font-size: 12px; color: var(--text-3); padding: 6px 13px;
  border: 1px solid var(--line-soft); border-radius: 100px;
  transition: border-color 0.2s, color 0.2s;
}
.svc:hover .pill { border-color: #3d434a; }

.svc--stack { flex-direction: column; }
.svc--stack .svc-media { width: 100%; height: 190px; order: -1; }

/* ---------- 设备 ---------- */
.eq-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.eq {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.eq:hover { border-color: #3a4048; transform: translateY(-3px); }
.eq-media { aspect-ratio: 4 / 3; overflow: hidden; background: var(--card-hi); position: relative; }
.eq-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease); }
.eq:hover .eq-media img { transform: scale(1.05); }
.eq-tag {
  position: absolute; top: 12px; right: 12px;
  background: rgba(20,23,26,0.85); border: 1px solid rgba(255,255,255,0.08);
  font-family: var(--font-en); font-size: 10.5px; letter-spacing: 0.1em;
  color: var(--text-3); padding: 4px 9px; border-radius: 2px;
}
.eq-body { padding: 22px 24px 26px; }
.eq-body h3 { font-size: 19px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.eq-body p { font-size: 13px; line-height: 1.7; color: var(--muted); }

/* ---------- 品质 ---------- */
.quality-grid { display: grid; grid-template-columns: 300px 1fr; gap: 40px; align-items: start; }
.iso-badge {
  aspect-ratio: 1 / 1; background: var(--card);
  border: 2px solid rgba(242, 101, 34, 0.55); border-radius: var(--radius);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px; text-align: center; padding: 24px;
  position: relative; overflow: hidden;
}
.iso-badge::after {
  content: ""; position: absolute; inset: 10px;
  border: 1px solid rgba(255,255,255,0.06); border-radius: 2px; pointer-events: none;
}
.iso-code {
  font-family: var(--font-en); font-size: 38px; font-weight: 700;
  color: var(--accent); letter-spacing: -0.01em; line-height: 1;
}
.iso-cn { font-size: 17px; font-weight: 600; color: #fff; }
.iso-rule { width: 36px; height: 2px; background: #3a4048; margin: 2px 0; }
.iso-en {
  font-family: var(--font-en); font-size: 9.5px; letter-spacing: 0.22em;
  color: var(--muted); line-height: 1.7; text-transform: uppercase;
}

.q-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.q-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px 26px;
  transition: border-color 0.25s, transform 0.25s var(--ease);
}
.q-card:hover { border-color: #3a4048; transform: translateY(-2px); }
.q-card h3 {
  font-size: 16.5px; font-weight: 600; color: #fff;
  display: flex; align-items: center; gap: 10px; margin-bottom: 9px;
}
.q-card h3::before {
  content: ""; width: 7px; height: 7px; background: var(--accent); flex: none;
}
.q-card p { font-size: 13px; line-height: 1.7; color: var(--muted); }

/* ---------- 优势四宫格 ---------- */
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.why-grid .q-card { padding: 26px 22px; }
.why-grid .q-card h3 { font-size: 15.5px; }

/* ---------- 常见问题 ---------- */
.faq { display: grid; gap: 10px; max-width: 920px; }
.faq details {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 0 22px;
  transition: border-color 0.25s;
}
.faq details[open], .faq details:hover { border-color: #3a4048; }
.faq summary {
  cursor: pointer; list-style: none; padding: 18px 0;
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  font-size: 15px; font-weight: 600; color: #fff;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; flex: none; color: var(--accent);
  font-size: 20px; font-weight: 400; line-height: 1;
}
.faq details[open] summary::after { content: "\2013"; }
.faq .faq-a {
  padding: 0 0 20px; margin: 0;
  font-size: 13.5px; line-height: 1.85; color: var(--muted);
}
.faq .faq-a a { color: var(--accent-soft); border-bottom: 1px solid rgba(242,101,34,0.45); }

/* ---------- CTA 条 ---------- */
.cta-strip { background: var(--accent); color: #fff; }
.cta-strip .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px; padding-top: 44px; padding-bottom: 44px; flex-wrap: wrap;
}
.cta-strip h2 { font-size: clamp(20px, 2.2vw, 26px); font-weight: 700; line-height: 1.35; }
.cta-strip p { font-size: 15px; color: var(--accent-soft); margin-top: 8px; }
.cta-strip a.plain { color: #fff; text-decoration: underline; text-underline-offset: 3px; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 460px; gap: 56px; align-items: start; }

.c-item {
  display: flex; gap: 20px; align-items: center;
  padding: 18px 0; border-bottom: 1px solid var(--line);
}
.c-item:first-child { padding-top: 0; }
.c-item:last-child { border-bottom: 0; }
.c-label {
  width: 78px; height: 24px; flex: none;
  background: var(--card); border-radius: 3px;
  display: grid; place-items: center;
  font-size: 12px; color: var(--accent);
}
.c-val { font-size: 15.5px; font-weight: 600; color: #fff; line-height: 1.55; font-family: var(--font-en); }
html[lang="zh-CN"] .c-val { font-family: var(--font-cn); }
.c-val a { transition: color 0.2s; }
.c-val a:hover { color: var(--accent); }
.c-val small { display: block; font-size: 12.5px; font-weight: 400; color: var(--muted); margin-top: 3px; }

.form {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 32px 34px;
}
.form h3 { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.form > p { font-size: 13px; color: var(--muted); margin-bottom: 24px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 7px; }
.field input, .field textarea, .field select {
  width: 100%; background: var(--bg-alt);
  border: 1px solid var(--line); border-radius: 4px;
  padding: 12px 14px; font-family: inherit; font-size: 13.5px; color: #fff;
  transition: border-color 0.2s, background 0.2s;
  outline: none;
}
.field input::placeholder, .field textarea::placeholder { color: var(--dim); }
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--accent); background: #191c20;
}
.field textarea { resize: vertical; min-height: 92px; line-height: 1.7; }
.field select { appearance: none; cursor: pointer; }
.form .btn { width: 100%; height: 50px; padding: 0; font-size: 15px; }
.form-note { font-size: 11.5px; color: var(--dim); line-height: 1.65; margin-top: 14px; text-align: center; }
.form-note a { color: var(--muted); text-decoration: underline; text-underline-offset: 2px; }

/* ---------- 页脚 ---------- */
.footer { background: var(--bg-deep); padding: 64px 0 30px; border-top: 1px solid var(--line); }
.f-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.4fr; gap: 56px; margin-bottom: 44px; }
.f-brand .brand { margin-bottom: 18px; }
.f-brand p { font-size: 13px; line-height: 1.85; color: var(--muted); max-width: 320px; }
.f-col h4 { font-size: 13px; font-weight: 600; color: #fff; margin-bottom: 16px; letter-spacing: 0.02em; }
.f-col li { margin-bottom: 11px; }
.f-col a, .f-col span { font-size: 13px; color: var(--muted); transition: color 0.2s; line-height: 1.65; }
.f-col a:hover { color: var(--accent); }
.f-div { height: 1px; background: var(--line); }
.f-bot {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; flex-wrap: wrap; padding-top: 26px;
  font-size: 12px; color: var(--dim);
}
.f-bot a { font-family: var(--font-en); letter-spacing: 0.04em; }
.f-bot a:hover { color: var(--muted); }

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  * { animation: none !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  :root { --gutter: 40px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 48px; padding-top: 64px; padding-bottom: 64px; }
  .hero-media { aspect-ratio: 16 / 9; max-width: 640px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .quality-grid { grid-template-columns: 1fr; gap: 32px; }
  .iso-badge { max-width: 300px; aspect-ratio: auto; padding: 40px 24px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .f-top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .nav-links { gap: 22px; }
}

@media (max-width: 860px) {
  :root { --gutter: 24px; }
  .sec, .sec-head { padding-top: 64px; }
  .sec { padding: 64px 0; }

  .topbar .wrap { min-height: 40px; font-size: 12px; }
  .topbar-left a:nth-child(2) { display: none; }

  .nav .wrap { min-height: 66px; }
  .nav-links, .nav-cta { display: none; }
  .burger { display: grid; }

  .nav.open .nav-links {
    display: flex; flex-direction: column; align-items: flex-start; gap: 0;
    position: absolute; top: 100%; left: 0; right: 0;
    background: #15181b; border-bottom: 1px solid var(--line);
    padding: 8px var(--gutter) 24px;
    box-shadow: 0 24px 40px -20px rgba(0,0,0,0.8);
  }
  .nav.open .nav-links a { width: 100%; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 16px; }
  .nav.open .nav-links a::after { display: none; }
  .nav.open .nav-cta { display: inline-flex; margin: 20px var(--gutter) 0; align-self: flex-start; }

  .hero h1 { font-size: 32px; }
  .hero-sub { font-size: 15px; }
  .badge { font-size: 12px; }
  .stat { padding-right: 22px; margin-right: 22px; }
  .stat + .stat { padding-left: 22px; }
  .stat-num { font-size: 26px; }

  .svc-row, .svc-row--b { grid-template-columns: 1fr; }
  .svc { flex-direction: column; }
  .svc-media { width: 100%; height: 200px; order: -1; }
  .svc--stack .svc-media { height: 180px; }

  .eq-grid { grid-template-columns: 1fr; }
  .q-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr 1fr; }
  .info-cards { grid-template-columns: 1fr 1fr; }

  .cta-strip .wrap { padding-top: 36px; padding-bottom: 36px; }
  .form { padding: 26px 22px; }

  .f-top { grid-template-columns: 1fr; gap: 32px; }
  .f-bot { justify-content: flex-start; }
}

@media (max-width: 420px) {
  .hero-actions .btn { width: 100%; }
  .info-cards { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .faq summary { font-size: 14px; }
  .c-item { gap: 14px; }
  .c-label { width: 66px; }
}

/* ============ 工厂实况图库 ============ */
.gal-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.gal {
  position: relative;
  margin: 0;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  background: #1f2226;
}
.gal img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform .45s ease, opacity .3s ease;
  opacity: .94;
}
.gal:hover img { transform: scale(1.045); opacity: 1; }
.gal figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 26px 14px 10px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: #e5e8ec;
  background: linear-gradient(transparent, rgba(10,12,14,.82));
}
@media (max-width: 960px) { .gal-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .gal-grid { grid-template-columns: 1fr 1fr; gap: 10px; } }