:root {
  --canvas: #000000;
  --surface-soft: #0d0d0d;
  --surface-card: #1a1a1a;
  --surface-elevated: #262626;
  --carbon-gray: #2b2b2b;
  --hairline: #3c3c3c;
  --on-dark: #ffffff;
  --body: #bbbbbb;
  --body-strong: #e6e6e6;
  --muted: #7e7e7e;
  --accent-blue-light: #0066b1;
  --accent-blue-dark: #1c69d4;
  --accent-red: #e22718;
  --electric-blue: #0653b6;
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 40px;
  --spacing-xxl: 64px;
  --spacing-section: 96px;
  --max-width: 1440px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  font-weight: 300;
  font-size: 16px;
  line-height: 1.5;
  color: var(--body);
  background: var(--canvas);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--on-dark);
  text-decoration: none;
}

.container {
  width: min(100% - 48px, var(--max-width));
  margin-inline: auto;
}

/* Accent stripe (DESIGN.md m-stripe-divider) */
.stripe-divider {
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--accent-blue-light) 0%,
    var(--accent-blue-dark) 50%,
    var(--accent-red) 100%
  );
  border: none;
}

/* Typography */
.display-xl {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.5px;
  color: var(--on-dark);
  text-transform: uppercase;
  margin: 0 0 var(--spacing-md);
}

.display-lg {
  font-size: clamp(1.75rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--on-dark);
  text-transform: uppercase;
  margin: 0 0 var(--spacing-lg);
}

.display-md {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--on-dark);
  text-transform: uppercase;
  margin: 0 0 var(--spacing-md);
}

.lead {
  font-size: 1.125rem;
  color: var(--body-strong);
  max-width: 42rem;
}

.label-uppercase {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
}

/* Navigation */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 80px;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  transition: height 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), background-color 0.3s ease;
}

.top-nav.is-scrolled {
  height: 60px;
  background: rgba(0, 0, 0, 0.9); /* slightly translucent on scroll */
  backdrop-filter: blur(8px); /* glassmorphism */
  -webkit-backdrop-filter: blur(8px);
}

.top-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--on-dark);
}

.logo-stripe {
  width: 4px;
  height: 28px;
  background: linear-gradient(
    180deg,
    var(--accent-blue-light),
    var(--accent-blue-dark),
    var(--accent-red)
  );
}

.logo-mark {
  display: block;
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  transition: width 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), height 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.top-nav.is-scrolled .logo-mark {
  width: 36px;
  height: 36px;
}

.hero-logo {
  display: block;
  width: 120px;
  height: 120px;
  margin: 0 0 var(--spacing-lg);
}

@media (max-width: 720px) {
  .hero-logo { width: 88px; height: 88px; }
  .logo-mark { width: 38px; height: 38px; }
  .top-nav.is-scrolled .logo-mark { width: 30px; height: 30px; }
}

.nav-links {
  display: none;
  gap: var(--spacing-xl);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 14px;
  letter-spacing: 0.5px;
  color: var(--body);
}

.nav-links a:hover {
  color: var(--on-dark);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--on-dark);
}

.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--canvas);
  flex-direction: column;
  padding: var(--spacing-xxl) var(--spacing-lg);
}

.nav-mobile.is-open {
  display: flex;
}

.nav-mobile .stripe-divider {
  width: 100%;
  margin-bottom: var(--spacing-xxl);
}

.nav-mobile ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-mobile a {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--hairline);
}

.nav-mobile-close {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  color: var(--on-dark);
  width: 48px;
  height: 48px;
  cursor: pointer;
  font-size: 1.25rem;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
  .nav-toggle {
    display: none;
  }
}

/* Buttons */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 16px 32px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  border-radius: 0;
  cursor: pointer;
  overflow: hidden;
  transition: border-color 0.3s ease, color 0.3s ease, transform 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* Subtle background glow on hover (dual gradient aura matching cards and logo) */
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 100%, rgba(28, 105, 212, 0.15) 0%, transparent 70%),
              radial-gradient(circle at 0% 0%, rgba(226, 39, 24, 0.15) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 1;
}

/* Slide-in tricolor M-stripe top border accent */
.btn::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--accent-blue-light) 0%,
    var(--accent-blue-dark) 50%,
    var(--accent-red) 100%
  );
  transition: left 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  pointer-events: none;
  z-index: 2;
}

.btn:hover {
  transform: translateY(-2px);
  border-color: var(--on-dark);
}

.btn:hover::before {
  opacity: 1;
}

.btn:hover::after {
  left: 0;
}

.btn-primary {
  background: transparent;
  color: var(--on-dark);
  border: 1px solid var(--on-dark);
}

.btn-primary:hover {
  background: var(--on-dark);
  color: var(--canvas);
}

/* Neutralizing background overlaps for primary filled hover */
.btn-primary:hover::before {
  opacity: 0; /* Let solid fill take over on pure white hover state */
}
.btn-primary:hover::after {
  left: -100%; /* Remove stripe accent when button turns solid white */
}

.btn-outline {
  background: transparent;
  color: var(--on-dark);
  border: 1px solid var(--hairline);
}

.btn-outline:hover {
  border-color: var(--on-dark);
}

/* Button text flicker - matches cards and logo electrical discharge */
@keyframes btnTextFlicker {
  0%, 94%, 96%, 98%, 100% { text-shadow: none; }
  95% { text-shadow: 0 0 8px rgba(28, 105, 212, 0.7); }
  97% { text-shadow: 0 0 8px rgba(226, 39, 24, 0.7); }
}

.btn:hover {
  animation: btnTextFlicker 5s infinite;
}

.text-link {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--on-dark);
}

.text-link::after {
  content: " →";
}

/* Hero */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: flex-end;
  padding: var(--spacing-xxl) 0 var(--spacing-section);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, transparent 40%, var(--canvas) 95%),
    radial-gradient(ellipse 80% 60% at 70% 30%, rgba(6, 83, 182, 0.25), transparent),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 79px,
      rgba(60, 60, 60, 0.15) 79px,
      rgba(60, 60, 60, 0.15) 80px
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 79px,
      rgba(60, 60, 60, 0.1) 79px,
      rgba(60, 60, 60, 0.1) 80px
    ),
    var(--surface-soft);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-tagline {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--electric-blue);
  margin-bottom: var(--spacing-md);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

/* Sections */
.section {
  padding: var(--spacing-section) 0;
  border-top: 1px solid var(--hairline);
}

.section-intro {
  margin-bottom: var(--spacing-xxl);
}

.two-col {
  display: grid;
  gap: var(--spacing-xxl);
}

@media (min-width: 768px) {
  .two-col {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

/* Service cards */
.card-grid {
  display: grid;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.service-card {
  position: relative;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  padding: var(--spacing-lg);
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), border-color 0.3s ease;
}

/* Subtle background glowing mesh on hover */
.service-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 100%, rgba(28, 105, 212, 0.08) 0%, transparent 60%),
              radial-gradient(circle at 0% 0%, rgba(226, 39, 24, 0.08) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

/* Top M-stripe slide-in accent */
.service-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--accent-blue-light) 0%,
    var(--accent-blue-dark) 50%,
    var(--accent-red) 100%
  );
  transition: left 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  pointer-events: none;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--on-dark);
}

.service-card:hover::before {
  opacity: 1;
}

.service-card:hover::after {
  left: 0;
}

/* Header flicker matches the electric discharge of the logo */
@keyframes cardHeadingFlicker {
  0%, 94%, 96%, 98%, 100% { color: var(--on-dark); text-shadow: none; }
  95% { color: #8ba2e2; text-shadow: 0 0 8px rgba(28, 105, 212, 0.6); }
  97% { color: #f28b84; text-shadow: 0 0 8px rgba(226, 39, 24, 0.6); }
}

.service-card:hover h3 {
  animation: cardHeadingFlicker 4s infinite;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--on-dark);
  text-transform: uppercase;
  margin: 0 0 var(--spacing-sm);
  transition: color 0.3s ease;
}

.service-card ul {
  margin: var(--spacing-md) 0 0;
  padding-left: 1.25rem;
  color: var(--body);
}

.service-card li {
  margin-bottom: var(--spacing-xs);
}

/* Spec cells (process steps) */
.spec-grid {
  display: grid;
  gap: 1px;
  background: var(--hairline);
}

@media (min-width: 768px) {
  .spec-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .spec-grid--5 {
    grid-template-columns: repeat(5, 1fr);
  }
}

.spec-cell {
  background: var(--surface-soft);
  padding: var(--spacing-lg);
}

.spec-cell .step-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--on-dark);
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.spec-cell h3 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--on-dark);
  margin: 0 0 var(--spacing-xs);
}

/* Why choose */
.why-grid {
  display: grid;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .why-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .why-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.why-item h3 {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--on-dark);
  margin: 0 0 var(--spacing-xs);
}

/* CTA band */
.cta-band {
  position: relative;
  padding: 80px 0;
  text-align: center;
  overflow: hidden;
}

.cta-band-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, var(--canvas), rgba(0, 0, 0, 0.7)),
    radial-gradient(circle at 50% 100%, rgba(28, 105, 212, 0.3), transparent 60%),
    var(--carbon-gray);
}

.cta-band .container {
  position: relative;
  z-index: 1;
}

/* Contact form */
.contact-form {
  max-width: 36rem;
}

.form-row {
  margin-bottom: var(--spacing-lg);
}

.form-row label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--on-dark);
  margin-bottom: var(--spacing-xs);
}

.form-row input,
.form-row textarea {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  font-family: inherit;
  font-size: 16px;
  font-weight: 300;
  color: var(--on-dark);
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 0;
}

.form-row textarea {
  min-height: 140px;
  resize: vertical;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--on-dark);
}

.form-status {
  margin-top: var(--spacing-md);
  font-size: 14px;
}

.form-status.success {
  color: #0fa336;
}

.form-status.error {
  color: var(--accent-red);
}

.form-note {
  font-size: 14px;
  color: var(--muted);
  margin-top: var(--spacing-md);
}

/* Footer */
.footer {
  padding: var(--spacing-xxl) 0;
  border-top: 1px solid var(--hairline);
}

.footer-grid {
  display: grid;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xxl);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer h4 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--on-dark);
  margin: 0 0 var(--spacing-md);
}

.footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer li {
  margin-bottom: var(--spacing-xs);
}

.footer a {
  color: var(--muted);
  font-size: 14px;
}

.footer a:hover {
  color: var(--on-dark);
}

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--hairline);
  font-size: 12px;
  color: var(--muted);
}

/* Focus list */
.focus-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.focus-pill {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  font-size: 14px;
  color: var(--body-strong);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}