/* ==========================================
   MCHTEC — Shared Design System
   ========================================== */

/* --- CSS Custom Properties (Theme) --- */
:root {
  --color-primary: #6fd7d6;
  --color-primary-dim: #6fd7d6;
  --color-primary-fixed: #8cf3f3;
  --color-primary-container: #2fa09f;
  --color-on-primary: #003737;
  --color-on-primary-container: #002f2f;
  --color-on-primary-fixed: #002020;
  --color-on-primary-fixed-variant: #004f4f;
  --color-primary-fixed-dim: #6fd7d6;
  --color-inverse-primary: #006a6a;
  --color-surface-tint: #6fd7d6;

  --color-secondary: #d8c860;
  --color-secondary-fixed: #f5e479;
  --color-secondary-fixed-dim: #d8c860;
  --color-secondary-container: #756901;
  --color-on-secondary: #373100;
  --color-on-secondary-container: #fbea7e;
  --color-on-secondary-fixed: #201c00;
  --color-on-secondary-fixed-variant: #504700;

  --color-tertiary: #c6c6c7;
  --color-tertiary-fixed: #e2e2e2;
  --color-tertiary-fixed-dim: #c6c6c7;
  --color-tertiary-container: #909191;
  --color-on-tertiary: #2f3131;
  --color-on-tertiary-container: #282a2a;
  --color-on-tertiary-fixed: #1a1c1c;
  --color-on-tertiary-fixed-variant: #454747;

  --color-error: #ffb4ab;
  --color-error-container: #93000a;
  --color-on-error: #690005;
  --color-on-error-container: #ffdad6;

  --color-background: #131317;
  --color-on-background: #e4e1e8;
  --color-surface: #131317;
  --color-surface-dim: #131317;
  --color-surface-bright: #39393e;
  --color-surface-container-lowest: #0d0e12;
  --color-surface-container-low: #1b1b20;
  --color-surface-container: #1f1f24;
  --color-surface-container-high: #292a2e;
  --color-surface-container-highest: #343439;
  --color-surface-variant: #343439;
  --color-on-surface: #e4e1e8;
  --color-on-surface-variant: #bcc9c8;
  --color-inverse-surface: #e4e1e8;
  --color-inverse-on-surface: #303035;

  --color-outline: #879392;
  --color-outline-variant: #3d4949;

  --color-industrial-blue-deep: #0d1117;
  --color-steel-silver: #848D9A;
  --color-signal-orange: #d8c860;
  --color-blueprint-grid: rgba(111, 215, 214, 0.1);

  /* Font families */
  --font-headline: 'Metropolis', sans-serif;
  --font-body: 'Work Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* --- Font Utility Classes --- */
.font-headline-xl {
  font-family: var(--font-headline);
  font-size: 48px;
  line-height: 56px;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.font-headline-lg {
  font-family: var(--font-headline);
  font-size: 32px;
  line-height: 40px;
  letter-spacing: 0.02em;
  font-weight: 400;
}

.font-headline-md {
  font-family: var(--font-headline);
  font-size: 24px;
  line-height: 32px;
  font-weight: 500;
}

.font-body-lg {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 28px;
  font-weight: 400;
}

.font-body-md {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 24px;
  font-weight: 400;
}

.font-label-caps {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.05em;
  font-weight: 600;
  text-transform: uppercase;
}

.font-mono-data {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 18px;
  font-weight: 400;
}

.font-display-lg {
  font-family: var(--font-headline);
  font-size: 48px;
  line-height: 56px;
  letter-spacing: 0.05em;
  font-weight: 300;
}

/* --- Blueprint Grid Patterns --- */
.blueprint-pattern {
  background-image: radial-gradient(var(--color-blueprint-grid) 1px, transparent 1px);
  background-size: 32px 32px;
}

.technical-grid-pattern {
  background-color: var(--color-background);
  background-image: radial-gradient(var(--color-outline-variant) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* Blueprint pattern variant (linear grid, used in services/about) */
.blueprint-grid-linear {
  background-image:
    linear-gradient(to right, rgba(140, 243, 243, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140, 243, 243, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* --- Unified Navigation Styles --- */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background-color: rgba(13, 14, 18, 0.9); /* surface-container-lowest/90 */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-outline-variant);
  overflow: hidden;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding-left: 64px;
  padding-right: 64px;
  padding-top: 0px;
  padding-bottom: 0px;
  max-width: 1440px;
  margin: 0 auto;
}

.nav-inner a:has(.nav-logo),
.nav-inner a[href="/"] {
  line-height: 0;
  display: block;
}

.nav-logo {
  width: auto;
  object-fit: contain;
  height: 80px;
  display: block;
  filter: brightness(0) invert(1);
}

.nav-links {
  display: none;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
  }
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.05em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-on-background);
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link.active {
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  font-weight: 700;
}

.nav-btn-quote {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 16px;
  letter-spacing: 0.05em;
  font-weight: 700;
  text-transform: uppercase;
  background-color: var(--color-primary);
  color: var(--color-on-primary-container);
  padding: 8px 24px;
  border: none;
  cursor: pointer;
  transition: filter 0.2s ease;
}

.nav-btn-quote:hover {
  filter: brightness(1.1);
}

/* --- Main content padding for fixed header --- */
main {
  padding-top: 120px;
}

/* --- Spacing Utility Classes --- */
.spacing-unit { width: 8px; height: 8px; }
.spacing-gutter { width: 24px; height: 24px; }
.section-gap { padding-top: 80px; padding-bottom: 80px; }

/* --- Material Symbols Fix --- */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  display: inline-block;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;
}

/* --- Asymmetric Divider --- */
.asymmetric-divider {
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary) 70%, var(--color-secondary) 70%, var(--color-secondary) 100%);
}

/* --- Industrial Clip (index.html hero accent) --- */
.industrial-clip {
  clip-path: polygon(0 0, 100% 0, 95% 100%, 0 100%);
}

/* --- Selection --- */
::selection {
  background-color: rgba(111, 215, 214, 0.3);
}

/* --- Scrollbar (Webkit) --- */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-background);
}
::-webkit-scrollbar-thumb {
  background: var(--color-outline-variant);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-outline);
}