/* ============================================================
   Bing Xuan — 合肥炳璇很腑网络科技有限公司
   Computer Systems Design & Related Services
   Design System: Digital Jade × Obsidian
   ============================================================ */

/* --- CSS Custom Properties --------------------------------- */
:root {
  /* Palette */
  --ink:        #080c16;
  --obsidian:   #111827;
  --slate:      #1a2235;
  --steel:      #243044;
  --jade:       #0d9e8c;
  --jade-deep:  #0a7c6d;
  --jade-glow:  #0fc9b0;
  --gold:       #c9a44b;
  --gold-warm:  #e0b95a;
  --coral:      #e0613d;
  --snow:       #f2f0ec;
  --smoke:      #c4c9d0;
  --mist:       #8a94a6;
  --fog:        #5a6577;

  /* Typography */
  --font-sans:  'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', monospace;
  --font-cn:    'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* Spacing scale */
  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   1.5rem;
  --space-xl:   2rem;
  --space-2xl:  3rem;
  --space-3xl:  4rem;
  --space-4xl:  6rem;
  --space-5xl:  8rem;

  /* Radii */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;
  --radius-xl:  24px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out:   cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-in:    cubic-bezier(0.55, 0.06, 0.68, 0.19);
  --dur-fast:   180ms;
  --dur-base:   300ms;
  --dur-slow:   500ms;
}

/* --- Reset & Base ------------------------------------------ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--smoke);
  background: var(--ink);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--jade-glow);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
a:hover, a:focus-visible {
  color: var(--gold-warm);
  outline: none;
}
a:focus-visible {
  outline: 2px solid var(--jade-glow);
  outline-offset: 3px;
  border-radius: 2px;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--snow);
}

h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.125rem; }

/* --- Utility Classes --------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-5xl) 0;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--jade);
  margin-bottom: var(--space-md);
}
.section-label::before {
  content: '';
  display: block;
  width: 28px;
  height: 2px;
  background: var(--jade);
}

.section-title {
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--mist);
  max-width: 620px;
  margin-bottom: var(--space-3xl);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.8em 1.8em;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background var(--dur-base) var(--ease-out);
  text-decoration: none;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--jade);
  color: var(--snow);
  box-shadow: 0 4px 20px -4px #0d9e8c66;
}
.btn-primary:hover {
  background: var(--jade-deep);
  box-shadow: 0 8px 30px -4px #0d9e8c88;
}

.btn-gold {
  background: var(--gold);
  color: var(--ink);
  box-shadow: 0 4px 20px -4px #c9a44b66;
}
.btn-gold:hover {
  background: var(--gold-warm);
  box-shadow: 0 8px 30px -4px #c9a44b88;
}

.btn-outline {
  background: transparent;
  color: var(--snow);
  border: 1.5px solid var(--steel);
}
.btn-outline:hover {
  border-color: var(--jade);
  color: var(--jade-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--smoke);
  padding: 0.5em 0;
}
.btn-ghost:hover {
  color: var(--snow);
}

/* --- Navigation -------------------------------------------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: background var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}
.site-nav.scrolled {
  background: var(--obsidian);
  box-shadow: 0 1px 0 0 var(--steel);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--snow);
  text-decoration: none;
}
.nav-brand:hover { color: var(--jade-glow); }
.nav-brand-icon {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--smoke);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--jade);
  transition: width var(--dur-base) var(--ease-out);
}
.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--snow);
}
.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  width: 100%;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: 1001;
}
.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--snow);
  border-radius: 2px;
  transition: transform var(--dur-base) var(--ease-out),
              opacity var(--dur-fast) var(--ease-out);
}
.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero Section ------------------------------------------ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--space-5xl) 0 var(--space-3xl);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--steel) 1px, transparent 1px),
    linear-gradient(90deg, var(--steel) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.15;
}
.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.08;
}
.hero-bg-orb--1 {
  width: 600px;
  height: 600px;
  background: var(--jade);
  top: -200px;
  right: -200px;
}
.hero-bg-orb--2 {
  width: 400px;
  height: 400px;
  background: var(--gold);
  bottom: -100px;
  left: -100px;
}
.hero .container {
  position: relative;
  z-index: 1;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.35em 1em;
  background: var(--slate);
  border: 1px solid var(--steel);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--jade-glow);
  margin-bottom: var(--space-xl);
}
.hero-badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade-glow);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.6); }
}
.hero-title {
  margin-bottom: var(--space-lg);
}
.hero-title .cn {
  display: block;
  font-family: var(--font-cn);
  font-size: 0.5em;
  font-weight: 400;
  color: var(--mist);
  margin-top: var(--space-xs);
}
.hero-desc {
  font-size: 1.125rem;
  color: var(--mist);
  max-width: 500px;
  margin-bottom: var(--space-xl);
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-geometric {
  position: relative;
  width: 100%;
  max-width: 460px;
  aspect-ratio: 1 / 1;
}
.hero-geo-ring {
  position: absolute;
  inset: 0;
  border: 2px solid var(--steel);
  border-radius: 50%;
}
.hero-geo-ring:nth-child(2) {
  inset: 18%;
  border-color: var(--jade);
  opacity: 0.5;
}
.hero-geo-ring:nth-child(3) {
  inset: 36%;
  border-color: var(--gold);
  opacity: 0.3;
}
.hero-geo-core {
  position: absolute;
  inset: 42%;
  background: var(--jade);
  border-radius: 50%;
  box-shadow: 0 0 60px 10px #0d9e8c33;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-geo-core svg {
  width: 40%;
  height: 40%;
}
.hero-geo-node {
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--gold);
  border-radius: 50%;
  box-shadow: 0 0 12px 2px #c9a44b66;
}
.hero-geo-node--1 { top: 8%; left: 50%; }
.hero-geo-node--2 { top: 50%; right: 4%; }
.hero-geo-node--3 { bottom: 10%; left: 20%; }
.hero-geo-node--4 { top: 22%; left: 6%; }
.hero-geo-line {
  position: absolute;
  background: var(--steel);
  opacity: 0.4;
}
.hero-scroll-hint {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--fog);
  font-size: 0.75rem;
  animation: float 2.5s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}
.hero-scroll-hint svg {
  width: 20px;
  height: 20px;
  opacity: 0.5;
}

/* --- Services Section -------------------------------------- */
.services {
  background: var(--obsidian);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}
.service-card {
  position: relative;
  padding: var(--space-2xl);
  background: var(--slate);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}
.service-card:hover {
  border-color: var(--jade);
  transform: translateY(-4px);
}
.service-card-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--obsidian);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  color: var(--jade);
  transition: border-color var(--dur-base), color var(--dur-base);
}
.service-card:hover .service-card-icon {
  border-color: var(--jade);
  color: var(--jade-glow);
}
.service-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}
.service-card p {
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* --- About Section ----------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}
.about-visual-stack {
  position: relative;
}
.about-card-stack {
  position: relative;
  height: 400px;
}
.about-card {
  position: absolute;
  padding: var(--space-xl);
  background: var(--slate);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  max-width: 360px;
}
.about-card--1 {
  top: 0;
  left: 0;
  z-index: 3;
}
.about-card--2 {
  top: 60px;
  left: 40px;
  z-index: 2;
  opacity: 0.7;
}
.about-card--3 {
  top: 120px;
  left: 80px;
  z-index: 1;
  opacity: 0.4;
}
.about-card h4 {
  font-size: 1rem;
  margin-bottom: var(--space-xs);
}
.about-card p {
  font-size: 0.875rem;
  color: var(--mist);
}
.about-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}
.about-metric {
  padding: var(--space-md) var(--space-lg);
  background: var(--obsidian);
  border-left: 3px solid var(--jade);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.about-metric-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--snow);
}
.about-metric-label {
  font-size: 0.8125rem;
  color: var(--mist);
  margin-top: 2px;
}

/* --- Process Section --------------------------------------- */
.process {
  background: var(--obsidian);
}
.process-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}
.process-track::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--steel);
  z-index: 0;
}
.process-step {
  position: relative;
  z-index: 1;
  text-align: center;
}
.process-step-num {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
  border-radius: 50%;
  background: var(--slate);
  border: 2px solid var(--steel);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--jade);
  transition: border-color var(--dur-base), color var(--dur-base),
              box-shadow var(--dur-base);
}
.process-step:hover .process-step-num {
  border-color: var(--jade);
  color: var(--jade-glow);
  box-shadow: 0 0 24px 0 #0d9e8c33;
}
.process-step h4 {
  margin-bottom: var(--space-xs);
}
.process-step p {
  font-size: 0.875rem;
  color: var(--mist);
}

/* --- Industries Section ------------------------------------ */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}
.industry-card {
  padding: var(--space-xl);
  background: var(--slate);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
  text-align: center;
  transition: border-color var(--dur-base), transform var(--dur-base);
}
.industry-card:hover {
  border-color: var(--jade);
  transform: translateY(-3px);
}
.industry-card svg {
  width: 36px;
  height: 36px;
  margin: 0 auto var(--space-md);
  color: var(--jade);
}
.industry-card h4 {
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
}
.industry-card p {
  font-size: 0.8125rem;
  color: var(--mist);
}

/* --- Stats Section ----------------------------------------- */
.stats {
  position: relative;
  overflow: hidden;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}
.stat-item {
  text-align: center;
  padding: var(--space-xl);
}
.stat-number {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  color: var(--jade-glow);
  line-height: 1;
  margin-bottom: var(--space-xs);
}
.stat-label {
  font-size: 0.875rem;
  color: var(--mist);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* --- Contact Section --------------------------------------- */
.contact {
  background: var(--obsidian);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-4xl);
}
.contact-info h2 {
  margin-bottom: var(--space-md);
}
.contact-info > p {
  color: var(--mist);
  margin-bottom: var(--space-xl);
}
.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--steel);
}
.contact-detail:last-child {
  border-bottom: none;
}
.contact-detail-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--slate);
  border-radius: var(--radius-sm);
  color: var(--jade);
}
.contact-detail h4 {
  font-size: 0.875rem;
  margin-bottom: 2px;
}
.contact-detail p {
  font-size: 0.875rem;
  color: var(--mist);
}
.contact-form-wrap {
  background: var(--slate);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
}
.contact-form-wrap h3 {
  margin-bottom: var(--space-lg);
}
.form-group {
  margin-bottom: var(--space-lg);
}
.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--smoke);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75em 1em;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--snow);
  background: var(--obsidian);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
  transition: border-color var(--dur-fast) var(--ease-out);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--jade);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--fog);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
.form-status {
  margin-top: var(--space-md);
  font-size: 0.875rem;
  font-weight: 600;
  min-height: 1.5em;
}
.form-status.success { color: var(--jade-glow); }
.form-status.error { color: var(--coral); }

/* --- CTA Section ------------------------------------------- */
.cta {
  text-align: center;
}
.cta-inner {
  padding: var(--space-4xl) var(--space-2xl);
  background: var(--slate);
  border: 1px solid var(--steel);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}
.cta-inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 300px;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--jade), transparent);
  border-radius: 0 0 2px 2px;
}
.cta-inner h2 {
  margin-bottom: var(--space-md);
}
.cta-inner p {
  color: var(--mist);
  max-width: 560px;
  margin: 0 auto var(--space-xl);
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

/* --- Footer ------------------------------------------------- */
.site-footer {
  background: var(--obsidian);
  border-top: 1px solid var(--steel);
  padding: var(--space-4xl) 0 var(--space-xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}
.footer-col h4 {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-lg);
  color: var(--mist);
}
.footer-brand p {
  font-size: 0.875rem;
  color: var(--mist);
  margin-top: var(--space-md);
  max-width: 280px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.footer-links a {
  font-size: 0.875rem;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur-fast);
}
.footer-links a:hover {
  color: var(--jade-glow);
}
.footer-address p {
  font-size: 0.8125rem;
  color: var(--mist);
  line-height: 1.8;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--steel);
  font-size: 0.8125rem;
  color: var(--fog);
}
.footer-bottom-links {
  display: flex;
  gap: var(--space-lg);
}
.footer-bottom-links a {
  font-size: 0.8125rem;
  color: var(--fog);
}
.footer-bottom-links a:hover {
  color: var(--jade-glow);
}

/* --- Policy Pages (Privacy / Terms) ------------------------ */
.policy-page {
  padding: var(--space-5xl) 0 var(--space-4xl);
  min-height: 100vh;
  background: var(--ink);
}
.policy-header {
  text-align: center;
  padding: var(--space-3xl) 0;
  border-bottom: 1px solid var(--steel);
  margin-bottom: var(--space-3xl);
}
.policy-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--space-sm);
}
.policy-header p {
  color: var(--mist);
  font-size: 1rem;
}
.policy-content {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  font-size: 1rem;
  line-height: 1.85;
}
.policy-content h2 {
  font-size: 1.5rem;
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--steel);
}
.policy-content h3 {
  font-size: 1.2rem;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}
.policy-content p {
  margin-bottom: var(--space-md);
  color: var(--smoke);
}
.policy-content ul {
  list-style: disc;
  padding-left: 1.5em;
  margin-bottom: var(--space-md);
  color: var(--smoke);
}
.policy-content ul li {
  margin-bottom: var(--space-sm);
}
.policy-content strong {
  color: var(--snow);
}
.policy-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  font-size: 0.875rem;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur-fast);
}
.policy-back:hover {
  color: var(--jade-glow);
}

/* --- Reveal Animations ------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out),
              transform 0.7s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

/* --- Responsive: Tablet (<=1024px) ------------------------- */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { margin: 0 auto var(--space-xl); }
  .hero-actions { justify-content: center; }
  .hero-visual { display: none; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .about-card-stack { height: 340px; }
  .process-track { grid-template-columns: repeat(2, 1fr); }
  .process-track::before { display: none; }
  .industries-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* --- Responsive: Mobile (<=640px) -------------------------- */
@media (max-width: 640px) {
  .container { padding: 0 var(--space-md); }
  .section { padding: var(--space-3xl) 0; }

  /* Mobile nav */
  .nav-links {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: var(--ink);
    gap: var(--space-xl);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-base) var(--ease-out);
  }
  .nav-links.open {
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a { font-size: 1.25rem; }
  .nav-links .btn { padding: 0.8em 2.4em; font-size: 1rem; }
  .nav-toggle { display: flex; }

  .services-grid { grid-template-columns: 1fr; }
  .about-card-stack { height: auto; }
  .about-card { position: static; margin-bottom: var(--space-md); opacity: 1 !important; max-width: 100%; }
  .about-metrics { grid-template-columns: 1fr; }
  .process-track { grid-template-columns: 1fr; }
  .industries-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-xl); }
  .footer-bottom { flex-direction: column; gap: var(--space-md); text-align: center; }
  .cta-inner { padding: var(--space-2xl) var(--space-lg); }

  .policy-content { font-size: 1rem; }
}

/* --- Print ------------------------------------------------- */
@media print {
  .site-nav, .hero-scroll-hint, .cta, .contact-form-wrap, .nav-toggle { display: none; }
  body { background: #fff; color: #111; }
  .section { padding: 2rem 0; }
}