/* ============================================================
   VAB Tech — styles.css
   Institutional identity. Wolf palette. Quiet authority.
   Colors: steel blue #2B7BC6, orange #E6611C, navy #1A2B3F
   ============================================================ */

/* === Design Tokens ============================================ */

:root {
  /* Brand — extracted from logo (geometric wolf) */
  --c-blue:        #2B7BC6;
  --c-blue-hover:  #1F63A8;
  --c-blue-subtle: #EBF4FD;
  --c-orange:      #C24E0F;
  --c-navy:        #1A2B3F;

  /* Grayscale ramp */
  --c-gray-50:  #F9FAFB;
  --c-gray-100: #F3F4F6;
  --c-gray-200: #E5E7EB;
  --c-gray-300: #D1D5DB;
  --c-gray-400: #9CA3AF;
  --c-gray-500: #6B7280;
  --c-gray-600: #4B5563;
  --c-gray-700: #374151;
  --c-gray-800: #1F2937;
  --c-gray-900: #111827;

  /* Semantic — light mode */
  --bg:           #FFFFFF;
  --bg-subtle:    var(--c-gray-50);
  --bg-alt:       var(--c-gray-100);
  --text:         var(--c-navy);
  --text-body:    var(--c-gray-700);
  --text-muted:   var(--c-gray-500);
  --text-subtle:  var(--c-gray-400);
  --border:       var(--c-gray-200);
  --border-mid:   var(--c-gray-300);
  --link:         var(--c-blue);
  --link-hover:   var(--c-blue-hover);

  /* Typography scale */
  --t-xs:   0.75rem;
  --t-sm:   0.875rem;
  --t-base: 1rem;
  --t-lg:   1.125rem;
  --t-xl:   1.5rem;
  --t-2xl:  2rem;
  --t-3xl:  2.75rem;
  --t-4xl:  3.75rem;

  /* Layout */
  --max-w:  1200px;
  --gutter: 1.5rem;
  --nav-h:  64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #0D1520;
    --bg-subtle:   #111C2D;
    --bg-alt:      #162035;
    --text:        #E2EAF4;
    --text-body:   #B0BECF;
    --text-muted:  #7A90A8;
    --text-subtle: #4E6278;
    --border:      #1E2F44;
    --border-mid:  #28405A;
    --link:        #5BA5E8;
    --link-hover:  #7BBCF0;
    --c-blue:        #5BA5E8;
    --c-blue-hover:  #7BBCF0;
    --c-blue-subtle: #112032;
    --c-navy:        #E2EAF4;
    --c-orange:      #E6611C;
  }
}

/* === Reset ===================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, picture { display: block; }
ul { list-style: none; }

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}
a:hover { color: var(--link-hover); }
a:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 3px;
  border-radius: 3px;
}

/* === Skip-to-content =========================================== */

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.625rem 1.25rem;
  background: var(--c-blue);
  color: #fff;
  font-size: var(--t-sm);
  font-weight: 600;
  border-radius: 0 0 6px 6px;
  text-decoration: none;
  transition: top 120ms ease;
}
.skip-link:focus {
  top: 0;
}

/* === Layout helpers ============================================ */

.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* === Navigation ================================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  .nav { background: rgba(13, 21, 32, 0.92); }
}

.nav__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--text);
  flex-shrink: 0;
}
.nav__brand:hover { color: var(--c-blue); }
.nav__brand:focus-visible { outline-offset: 4px; }

.nav__logo {
  width: auto;
  height: 36px;
  object-fit: contain;
}

.nav__name {
  font-size: var(--t-base);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav__link {
  display: inline-block;
  padding: 0.375rem 0.75rem;
  font-size: var(--t-sm);
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 6px;
  transition: color 120ms ease, background 120ms ease;
}
.nav__link:hover {
  color: var(--text);
  background: var(--bg-subtle);
}
.nav__link:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 2px;
  color: var(--text);
}

.nav__lang {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 1rem;
  padding-left: 1rem;
  border-left: 1px solid var(--border);
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
}
.nav__lang-active {
  color: var(--text);
}
.nav__lang-sep {
  color: var(--text-subtle);
}
.nav__lang-link {
  color: var(--text-muted);
  text-decoration: none;
}
.nav__lang-link:hover { color: var(--link); }
.nav__lang-link:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (max-width: 639px) {
  .nav__links { display: none; }
}

/* === Hero ====================================================== */

.hero {
  position: relative;
  overflow: hidden;
  padding-top: 5rem;
  padding-bottom: 5rem;
  border-bottom: 1px solid var(--border);
}

/* Dot-grid texture */
.hero__texture {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(43, 123, 198, 0.14) 1.5px, transparent 1.5px);
  background-size: 28px 28px;
  pointer-events: none;
}
@media (prefers-color-scheme: dark) {
  .hero__texture {
    background-image: radial-gradient(circle, rgba(91, 165, 232, 0.1) 1.5px, transparent 1.5px);
  }
}

.hero__inner {
  position: relative;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin-bottom: 1.25rem;
}
.hero__eyebrow::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-orange);
  border-radius: 2px;
}

.hero__title {
  font-family: ui-serif, 'Palatino Linotype', Palatino, 'Book Antiqua', Georgia, serif;
  font-size: clamp(var(--t-3xl), 5.5vw, var(--t-4xl));
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.hero__sub {
  font-size: var(--t-lg);
  color: var(--text-muted);
  max-width: 42ch;
  line-height: 1.6;
  margin-bottom: 2.5rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.625rem 1.25rem;
  border-radius: 6px;
  font-size: var(--t-sm);
  font-weight: 600;
  text-decoration: none;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease, transform 120ms ease;
  cursor: pointer;
}
.btn:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--c-blue);
  color: #fff;
  border: 1.5px solid var(--c-blue);
}
.btn--primary:hover {
  background: var(--c-blue-hover);
  border-color: var(--c-blue-hover);
  color: #fff;
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1.5px solid var(--border-mid);
}
.btn--ghost:hover {
  border-color: var(--c-blue);
  color: var(--c-blue);
  background: var(--c-blue-subtle);
}

/* Hero logo frame */
.hero__mark {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero__logo-frame {
  background: var(--bg);
  border: 1px solid var(--border-mid);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 32px rgba(26, 43, 63, 0.08), 0 1px 4px rgba(26, 43, 63, 0.06);
  max-width: 400px;
  width: 100%;
}

@media (prefers-color-scheme: dark) {
  .hero__logo-frame {
    box-shadow: 0 4px 32px rgba(0, 0, 0, 0.4), 0 1px 4px rgba(0, 0, 0, 0.3);
    background: var(--bg-alt);
  }
}

.hero__logo-img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .hero__mark { order: -1; }
  .hero__logo-frame { max-width: 280px; }
  .hero__sub { max-width: none; }
}

@media (max-width: 639px) {
  .hero { padding-top: 3rem; padding-bottom: 3rem; }
  .hero__logo-frame { max-width: 200px; }
}

/* === Sections ================================================== */

.section {
  padding-top: 5rem;
  padding-bottom: 5rem;
  border-bottom: 1px solid var(--border);
}

.section--alt {
  background: var(--bg-subtle);
}

.section__head {
  margin-bottom: 2.5rem;
}

.section__title {
  font-size: var(--t-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.25;
}

.section__subtitle {
  font-size: var(--t-sm);
  color: var(--text-muted);
  max-width: 60ch;
  line-height: 1.6;
}

.section__body {
  font-size: var(--t-lg);
  color: var(--text-body);
  max-width: 68ch;
  line-height: 1.7;
}

.section__footnote {
  margin-top: 1.5rem;
  font-size: var(--t-sm);
  color: var(--text-subtle);
}

@media (max-width: 639px) {
  .section { padding-top: 3rem; padding-bottom: 3rem; }
}

/* === Product Cards ============================================= */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}
.card-grid > .card:only-child {
  max-width: 360px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  transition: border-color 150ms ease, transform 150ms ease, box-shadow 150ms ease;
}
.card:hover {
  border-color: var(--c-blue);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(43, 123, 198, 0.1);
}

@media (prefers-color-scheme: dark) {
  .card { background: var(--bg-alt); }
  .card:hover { box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3); }
}

.card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.card__name {
  font-size: var(--t-lg);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

.pill {
  display: inline-block;
  padding: 0.2em 0.7em;
  border-radius: 20px;
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(194, 78, 15, 0.12);
  color: var(--c-orange);
  border: 1px solid rgba(194, 78, 15, 0.2);
  white-space: nowrap;
}

.card__desc {
  font-size: var(--t-sm);
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: var(--t-sm);
  font-weight: 600;
  color: var(--c-blue);
  text-decoration: none;
  transition: gap 120ms ease, color 120ms ease;
}
.card__link:hover {
  color: var(--c-blue-hover);
  gap: 0.625rem;
}
.card__link:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 3px;
  border-radius: 3px;
}

/* === Legal Section ============================================= */

.section--legal {
  background: var(--c-blue-subtle);
  border-top: 3px solid var(--c-blue);
  border-bottom: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  .section--legal { background: var(--bg-alt); }
}

.legal-dl {
  border: 1px solid var(--border-mid);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg);
}

@media (prefers-color-scheme: dark) {
  .legal-dl { background: var(--bg-subtle); }
}

.legal-dl__row {
  display: grid;
  grid-template-columns: 220px 1fr;
  align-items: baseline;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  gap: 1rem;
}
.legal-dl__row:last-child { border-bottom: none; }

.legal-dl__row:hover {
  background: var(--bg-subtle);
}
@media (prefers-color-scheme: dark) {
  .legal-dl__row:hover { background: var(--bg-alt); }
}

.legal-dl__term {
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.legal-dl__def {
  font-size: var(--t-sm);
  font-weight: 500;
  color: var(--text);
  line-height: 1.5;
}

.legal-dl__def--mono {
  font-family: 'SFMono-Regular', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  font-size: var(--t-sm);
  font-variant-numeric: tabular-nums lining-nums;
  letter-spacing: 0.04em;
  font-weight: 400;
}

@media (max-width: 639px) {
  .legal-dl__row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
    padding: 0.875rem 1rem;
  }
}

/* === Contact =================================================== */

.contact-email {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: var(--t-xl);
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
  padding-bottom: 2px;
  border-bottom: 2px solid var(--c-blue);
  transition: color 120ms ease, border-color 120ms ease;
}
.contact-email:hover {
  color: var(--c-blue);
  border-color: var(--c-orange);
}
.contact-email:focus-visible {
  outline: 2px solid var(--c-blue);
  outline-offset: 4px;
  border-radius: 2px;
}

@media (max-width: 639px) {
  .contact-email { font-size: var(--t-lg); }
}

/* === Footer ==================================================== */

.footer {
  padding: 2.5rem 0;
  background: var(--bg-alt);
}

.footer__inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.footer__identity {
  font-size: var(--t-sm);
  font-weight: 600;
  color: var(--text-muted);
}

.footer__meta {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: var(--t-xs);
  color: var(--text-subtle);
}

.footer__dot {
  opacity: 0.4;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}