/* ============================================
   航电所（成都）科技有限公司
   Design tokens & 基础样式
   ============================================ */

@import url("https://fonts.googleapis.cn/css2?family=Noto+Sans+SC:wght@300;400;500;700&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@300;400;500&display=swap");

:root {
  /* Colors — PCB 基材配色 */
  --bg: #0a0f0d;
  --bg-elev: #0e1416;
  --panel: #10171a;
  --line: #1c2528;
  --line-strong: #2a3438;
  --fg: #e8ecea;
  --fg-dim: #a7b0ac;
  --fg-mute: #7c8783;
  --accent: #c9a35d;
  --accent-soft: #8a6f3d;
  --solder: #4a7a6a;

  /* Radii */
  --radius: 2px;
  --radius-lg: 6px;

  /* Typography */
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-en: "Inter", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  /* Motion */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur-fast: 180ms;
  --dur-med: 320ms;
  --dur-slow: 480ms;

  /* Container */
  --container: 1280px;
  --gutter: 32px;
}

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

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font-cn);
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.75;
  font-weight: 400;
  overflow-x: hidden;
  min-height: 100vh;
}

/* PCB 底纹：极淡的走线 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(201, 163, 93, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 163, 93, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at 50% 20%, black 0%, transparent 70%);
}

a { color: inherit; text-decoration: none; }

img, svg { display: block; max-width: 100%; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  position: relative;
  z-index: 1;
}

/* ============================================
   Typography
   ============================================ */
.mono { font-family: var(--font-mono); }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--accent);
}

h1, h2, h3, h4 {
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--fg);
  line-height: 1.25;
}

h2 {
  font-size: clamp(28px, 3.4vw, 44px);
  margin-bottom: 8px;
}
h3 {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 12px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 64px;
  flex-wrap: wrap;
}
.section-head .lead p {
  color: var(--fg-mute);
  margin-top: 12px;
  max-width: 560px;
}

/* ============================================
   Link 下划线动效
   ============================================ */
.link {
  position: relative;
  color: var(--fg-dim);
  transition: color var(--dur-fast) var(--ease);
}
.link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  height: 1px;
  width: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease);
}
.link:hover { color: var(--accent); }
.link:hover::after { transform: scaleX(1); }

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  border-radius: var(--radius);
  background: transparent;
  transition: all var(--dur-fast) var(--ease);
  cursor: pointer;
}
.btn:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn .arrow {
  transition: transform var(--dur-fast) var(--ease);
}
.btn:hover .arrow { transform: translateX(4px); }

.btn.ghost {
  border-color: var(--line-strong);
  color: var(--fg-dim);
}
.btn.ghost:hover {
  border-color: var(--fg-dim);
  color: var(--fg);
  background: transparent;
}

/* ============================================
   Header
   ============================================ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease);
  border-bottom: 1px solid transparent;
}
.header.scrolled {
  background: rgba(10, 15, 13, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  width: 32px;
  height: 32px;
  color: var(--accent);
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-name {
  font-size: 15px;
  color: var(--fg);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.brand-en {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-mute);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.nav {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav a {
  font-size: 14px;
  color: var(--fg-dim);
  transition: color var(--dur-fast) var(--ease);
  position: relative;
}
.nav a:hover { color: var(--accent); }
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease);
}
.nav a:hover::after { transform: scaleX(1); }
.header-tel {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
}
.header-tel svg { width: 14px; height: 14px; }

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--fg);
  width: 40px; height: 40px;
  border-radius: var(--radius);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* Mobile drawer */
.mobile-nav {
  position: fixed;
  top: 76px;
  left: 0; right: 0;
  background: var(--bg);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 24px var(--gutter);
  transform: translateY(-10px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--dur-med) var(--ease);
  z-index: 99;
}
.mobile-nav.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.mobile-nav a {
  display: block;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--fg-dim);
  font-size: 15px;
}
.mobile-nav a:last-child { border-bottom: none; }

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  padding: 200px 0 120px;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 80px;
  align-items: center;
}
.hero-eyebrow { margin-bottom: 32px; }
.hero h1 {
  font-size: clamp(38px, 5.4vw, 68px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 32px;
}
.hero h1 .accent { color: var(--accent); font-weight: 400; }
.hero h1 .en {
  display: block;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--fg-mute);
  letter-spacing: 0.15em;
  margin-top: 24px;
  text-transform: uppercase;
  font-weight: 400;
}
.hero-lead {
  color: var(--fg-dim);
  font-size: 16px;
  max-width: 520px;
  line-height: 1.85;
  margin-bottom: 40px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero stats */
.hero-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  margin-top: 80px;
}
.stat {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  align-items: baseline;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
.stat-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 0.1em;
}
.stat-val {
  font-family: var(--font-mono);
  font-size: 40px;
  color: var(--accent);
  font-weight: 300;
  line-height: 1;
}
.stat-val small { font-size: 16px; color: var(--fg-mute); margin-left: 6px; }
.stat-label {
  font-size: 14px;
  color: var(--fg-dim);
  text-align: right;
}

/* Hero PCB SVG */
.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}
.hero-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(74, 122, 106, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(74, 122, 106, 0.08) 1px, transparent 1px);
  background-size: 24px 24px;
}
.hero-visual svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.corner-mark {
  position: absolute;
  width: 20px; height: 20px;
  border: 1px solid var(--accent-soft);
}
.corner-mark.tl { top: 12px; left: 12px; border-right: none; border-bottom: none; }
.corner-mark.tr { top: 12px; right: 12px; border-left: none; border-bottom: none; }
.corner-mark.bl { bottom: 12px; left: 12px; border-right: none; border-top: none; }
.corner-mark.br { bottom: 12px; right: 12px; border-left: none; border-top: none; }

.visual-label {
  position: absolute;
  bottom: 20px;
  left: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.visual-label .val { color: var(--accent); }

/* ============================================
   Sections
   ============================================ */
section {
  padding: 120px 0;
  position: relative;
}
section + section { border-top: 1px solid var(--line); }

/* ============================================
   Services
   ============================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-bottom: none;
  border-right: none;
}
.service {
  padding: 36px 32px 40px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: background var(--dur-fast) var(--ease);
  cursor: default;
}
.service::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 2px;
  height: 0;
  background: var(--accent);
  transition: height var(--dur-med) var(--ease);
}
.service:hover { background: var(--bg-elev); }
.service:hover::before { height: 100%; }
.service:hover .service-icon { color: var(--accent); }
.service:hover .service-no { color: var(--accent); }

.service-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 28px;
}
.service-no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 0.1em;
  transition: color var(--dur-fast) var(--ease);
}
.service-icon {
  width: 28px; height: 28px;
  color: var(--fg-dim);
  transition: color var(--dur-fast) var(--ease);
}
.service h3 {
  font-size: 18px;
  color: var(--fg);
  margin-bottom: 14px;
  font-weight: 500;
}
.service p {
  color: var(--fg-mute);
  font-size: 14px;
  line-height: 1.75;
}
.service-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.05em;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}
.service:hover .service-more { opacity: 1; }

/* ============================================
   Capabilities
   ============================================ */
.cap-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.spec-list {
  border-top: 1px solid var(--line);
}
.spec-row {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  align-items: center;
  transition: background var(--dur-fast) var(--ease);
}
.spec-row:hover { background: var(--bg-elev); padding-left: 12px; padding-right: 12px; }
.spec-name {
  font-size: 14px;
  color: var(--fg);
}
.spec-val {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-dim);
  letter-spacing: 0.02em;
}
.spec-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  padding: 3px 8px;
  border: 1px solid var(--accent-soft);
  border-radius: var(--radius);
  letter-spacing: 0.05em;
}

.cap-visual {
  border: 1px solid var(--line);
  padding: 32px;
  background: var(--panel);
}
.cap-visual h4 {
  font-size: 14px;
  color: var(--fg-mute);
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  margin-bottom: 24px;
  text-transform: uppercase;
}
.equip-list {
  list-style: none;
  display: grid;
  gap: 14px;
}
.equip-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  color: var(--fg-dim);
  font-size: 14px;
}
.equip-list li::before {
  content: "";
  flex-shrink: 0;
  width: 6px; height: 6px;
  background: var(--accent);
  transform: translateY(-1px);
}
.equip-list .eq-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  margin-left: auto;
}

/* ============================================
   Cases
   ============================================ */
.case-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-bottom: none;
  border-right: none;
}
.case {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 32px 28px;
  transition: background var(--dur-fast) var(--ease);
  cursor: default;
  position: relative;
}
.case:hover { background: var(--bg-elev); }
.case:hover .case-arrow { color: var(--accent); transform: translate(2px, -2px); }
.case-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  border: 1px solid var(--accent-soft);
  padding: 2px 8px;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}
.case h3 {
  font-size: 16px;
  color: var(--fg);
  margin-bottom: 10px;
  font-weight: 500;
  line-height: 1.4;
}
.case p {
  font-size: 13px;
  color: var(--fg-mute);
  line-height: 1.65;
}
.case-arrow {
  position: absolute;
  top: 32px;
  right: 28px;
  color: var(--fg-mute);
  transition: all var(--dur-fast) var(--ease);
}

/* ============================================
   About
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-text p {
  color: var(--fg-dim);
  font-size: 15px;
  line-height: 1.9;
  margin-bottom: 20px;
}
.about-text p:last-of-type { margin-bottom: 32px; }
.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.hl {
  padding: 32px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.hl-num {
  font-family: var(--font-mono);
  font-size: 40px;
  color: var(--accent);
  font-weight: 300;
  line-height: 1;
  margin-bottom: 12px;
}
.hl-num small { font-size: 14px; color: var(--fg-mute); margin-left: 4px; }
.hl-label {
  font-size: 13px;
  color: var(--fg-mute);
  letter-spacing: 0.03em;
}

/* ============================================
   News
   ============================================ */
.news-list {
  border-top: 1px solid var(--line);
}
.news-item {
  display: grid;
  grid-template-columns: 140px 1fr 100px;
  gap: 48px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  align-items: center;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
}
.news-item:hover { background: var(--bg-elev); padding-left: 16px; padding-right: 16px; }
.news-item:hover .news-title { color: var(--accent); }
.news-item:hover .news-arrow { color: var(--accent); transform: translateX(4px); }
.news-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-mute);
  letter-spacing: 0.05em;
}
.news-title {
  font-size: 15px;
  color: var(--fg);
  transition: color var(--dur-fast) var(--ease);
  line-height: 1.6;
}
.news-arrow {
  color: var(--fg-mute);
  text-align: right;
  transition: all var(--dur-fast) var(--ease);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ============================================
   Contact
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.contact-info {
  border: 1px solid var(--line);
  padding: 40px;
}
.contact-info h3 {
  font-size: 20px;
  margin-bottom: 8px;
}
.contact-info .lead {
  color: var(--fg-mute);
  margin-bottom: 32px;
  font-size: 14px;
}
.contact-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  align-items: center;
}
.contact-item:last-child { border-bottom: 1px solid var(--line); }
.contact-icon {
  width: 40px; height: 40px;
  border: 1px solid var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
}
.contact-icon svg { width: 16px; height: 16px; }
.contact-label {
  font-size: 12px;
  color: var(--fg-mute);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.contact-value {
  font-size: 15px;
  color: var(--fg);
}
.contact-value.mono { font-family: var(--font-mono); color: var(--accent); font-size: 18px; }

.contact-form {
  display: grid;
  gap: 20px;
}
.form-row {
  display: grid;
  gap: 8px;
}
.form-row label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.form-row input,
.form-row textarea,
.form-row select {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
  color: var(--fg);
  font-family: var(--font-cn);
  font-size: 15px;
  outline: none;
  transition: border-color var(--dur-fast) var(--ease);
  resize: none;
}
.form-row textarea { min-height: 100px; }
.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus { border-color: var(--accent-soft); }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.form-toast {
  margin-top: 8px;
  padding: 12px 14px;
  border: 1px solid var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  border-radius: var(--radius);
  display: none;
}
.form-toast.show { display: block; }

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 80px 0 32px;
  border-top: 1px solid var(--line);
  background: var(--bg-elev);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
}
.footer-brand .brand {
  margin-bottom: 20px;
}
.footer-desc {
  color: var(--fg-mute);
  font-size: 13px;
  line-height: 1.75;
  max-width: 360px;
}
.footer h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.footer ul {
  list-style: none;
  display: grid;
  gap: 12px;
}
.footer ul a {
  color: var(--fg-dim);
  font-size: 13px;
  transition: color var(--dur-fast) var(--ease);
}
.footer ul a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 0.03em;
}
.footer-bottom a { color: var(--fg-mute); transition: color var(--dur-fast) var(--ease); }
.footer-bottom a:hover { color: var(--accent); }

/* ============================================
   Floating Contact
   ============================================ */
.float-contact {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.float-btn {
  width: 48px; height: 48px;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  color: var(--fg-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
  position: relative;
}
.float-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.float-btn svg { width: 18px; height: 18px; }
.float-btn .tooltip {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--panel);
  border: 1px solid var(--line-strong);
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease);
  border-radius: var(--radius);
}
.float-btn:hover .tooltip { opacity: 1; }

/* ============================================
   Reveal animation
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.reveal-stagger.in > * {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger.in > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.in > *:nth-child(2) { transition-delay: 60ms; }
.reveal-stagger.in > *:nth-child(3) { transition-delay: 120ms; }
.reveal-stagger.in > *:nth-child(4) { transition-delay: 180ms; }
.reveal-stagger.in > *:nth-child(5) { transition-delay: 240ms; }
.reveal-stagger.in > *:nth-child(6) { transition-delay: 300ms; }
.reveal-stagger.in > *:nth-child(7) { transition-delay: 360ms; }
.reveal-stagger.in > *:nth-child(8) { transition-delay: 420ms; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .hero { padding: 160px 0 80px; }
  .hero-grid { grid-template-columns: 1fr; gap: 60px; }
  .hero-visual { max-width: 500px; }
  .cap-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 640px) {
  :root { --gutter: 20px; }
  body { font-size: 14px; }
  section { padding: 72px 0; }
  .hero { padding: 140px 0 60px; }
  .nav, .header-tel { display: none; }
  .menu-toggle { display: inline-flex; }
  .header-inner { height: 64px; }
  .mobile-nav { top: 64px; }
  .hero h1 { font-size: 34px; }
  h2 { font-size: 26px; }
  .services-grid,
  .case-grid,
  .about-highlights,
  .footer-grid { grid-template-columns: 1fr; }
  .spec-row { grid-template-columns: 1fr; gap: 6px; padding: 18px 0; }
  .spec-tag { justify-self: start; }
  .news-item { grid-template-columns: 1fr; gap: 8px; padding: 20px 0; }
  .news-arrow { display: none; }
  .stat { grid-template-columns: 40px 1fr; gap: 12px; }
  .stat-label { grid-column: 1 / -1; text-align: left; }
  .form-row-2 { grid-template-columns: 1fr; gap: 20px; }
  .contact-info { padding: 28px; }
  .float-contact { right: 16px; bottom: 16px; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 16px; }
}