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

/* ── Design tokens ───────────────────────────────────────────────────────── */
:root {
  --navy:        #1B2B4B;
  --navy-deep:   #111D33;
  --blue:        #2E5FA3;
  --blue-light:  #4A7FC1;
  --white:       #FFFFFF;
  --off-white:   #F7F9FC;
  --gray-100:    #EEF2F7;
  --gray-300:    #C8D4E4;
  --gray-500:    #7A8DA8;
  --gray-700:    #3D4F66;
  --text:        #1A2333;
  --text-muted:  #5C6E84;

  --font:        system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:        "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --max-w:       1080px;
  --pad-x:       clamp(1.25rem, 5vw, 3rem);
  --pad-y:       clamp(3rem, 8vw, 6rem);

  --radius:      4px;
  --radius-lg:   8px;
  --shadow:      0 1px 4px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --transition:  160ms ease;
}

/* ── Base typography ─────────────────────────────────────────────────────── */
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.015em;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; text-transform: uppercase; letter-spacing: .08em; color: var(--blue); }

p { color: var(--text-muted); max-width: 65ch; }

a { color: var(--blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--navy); }

/* ── Layout utilities ────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.section {
  padding: var(--pad-y) 0;
}

.section--alt {
  background: var(--off-white);
}

/* ── Navigation ──────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-100);
  padding: 0 var(--pad-x);
}

.nav__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav__brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav__brand-name {
  font-size: .95rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.01em;
}

.nav__brand-tag {
  font-size: .7rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: .1em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav__links a {
  font-size: .875rem;
  font-weight: 500;
  color: var(--gray-700);
}

.nav__links a:hover,
.nav__links a.active { color: var(--navy); }

.nav__cta {
  font-size: .875rem;
  font-weight: 600;
  color: var(--blue) !important;
  border: 1.5px solid var(--blue);
  padding: .35rem .9rem;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
}

.nav__cta:hover {
  background: var(--blue);
  color: var(--white) !important;
}

/* ── Hero ────────────────────────────────────────────────────────────────── */
.hero {
  padding: clamp(4rem, 12vw, 9rem) 0 clamp(3rem, 8vw, 7rem);
  background: linear-gradient(160deg, var(--navy-deep) 0%, var(--navy) 100%);
  color: var(--white);
}

.hero .container { display: flex; flex-direction: column; gap: 2rem; }

.hero__eyebrow {
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--blue-light);
}

.hero__headline {
  color: var(--white);
  max-width: 18ch;
}

.hero__sub {
  color: rgba(255,255,255,.65);
  font-size: 1.1rem;
  max-width: 52ch;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: .5rem;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.4rem;
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  border: 1.5px solid transparent;
  text-decoration: none;
}

.btn--primary {
  background: var(--blue);
  color: var(--white);
}

.btn--primary:hover {
  background: var(--blue-light);
  color: var(--white);
}

.btn--outline {
  background: transparent;
  color: rgba(255,255,255,.85);
  border-color: rgba(255,255,255,.3);
}

.btn--outline:hover {
  border-color: rgba(255,255,255,.7);
  color: var(--white);
}

/* ── Domain cards (home) ─────────────────────────────────────────────────── */
.domains {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.domain-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition), transform var(--transition);
}

.domain-card:hover {
  box-shadow: 0 4px 24px rgba(0,0,0,.1);
  transform: translateY(-2px);
}

.domain-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.domain-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .5rem;
}

.domain-card__body {
  font-size: .875rem;
  color: var(--text-muted);
  max-width: none;
}

/* ── Services page ───────────────────────────────────────────────────────── */
.service-block {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  padding: 3rem 0;
  border-bottom: 1px solid var(--gray-100);
}

.service-block:last-child { border-bottom: none; }

.service-block__label { padding-top: .25rem; }

.service-block__content h3 { margin-bottom: .75rem; }

.service-block__content p { margin-bottom: 1rem; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1rem;
}

.tag {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--blue);
  background: var(--gray-100);
  padding: .25rem .6rem;
  border-radius: 2px;
}

/* ── Page header (interior pages) ───────────────────────────────────────── */
.page-header {
  background: var(--navy);
  padding: clamp(2.5rem, 7vw, 5rem) 0 clamp(2rem, 5vw, 4rem);
  color: var(--white);
}

.page-header h1 { color: var(--white); }
.page-header p  { color: rgba(255,255,255,.6); margin-top: .75rem; max-width: 52ch; }

/* ── Research / Insights ─────────────────────────────────────────────────── */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.research-card {
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  background: var(--white);
}

.research-card__type {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--blue);
  margin-bottom: .75rem;
}

.research-card__title { font-size: 1.05rem; margin-bottom: .5rem; }
.research-card__body  { font-size: .875rem; }

.coming-soon {
  text-align: center;
  padding: 5rem 0;
  color: var(--text-muted);
}

.coming-soon p { margin: 0 auto; }

/* ── About ───────────────────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  align-items: start;
}

.about-aside {
  position: sticky;
  top: 80px;
}

.about-aside__name { font-size: 1.25rem; margin-bottom: .25rem; }
.about-aside__role { font-size: .875rem; color: var(--text-muted); }

.philosophy {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid var(--gray-100);
}

.philosophy blockquote {
  font-size: 1.15rem;
  color: var(--navy);
  font-style: italic;
  border-left: 3px solid var(--blue);
  padding-left: 1.25rem;
  margin: 1.5rem 0;
}

/* ── Contact ─────────────────────────────────────────────────────────────── */
.contact-block {
  max-width: 560px;
}

.contact-block p { margin-bottom: 2rem; }

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
}

.contact-link:hover { color: var(--blue); }

/* ── Footer ──────────────────────────────────────────────────────────────── */
.footer {
  background: var(--navy-deep);
  color: rgba(255,255,255,.4);
  padding: 2.5rem var(--pad-x);
  font-size: .8rem;
}

.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__brand { color: rgba(255,255,255,.7); font-weight: 600; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav__links { display: none; }

  .service-block { grid-template-columns: 1fr; gap: 1rem; }

  .about-grid { grid-template-columns: 1fr; }
  .about-aside { position: static; }
}

/* ── Skip navigation (WCAG 2.4.1) ───────────────────────────────────────── */
.skip-nav {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--navy);
  color: var(--white);
  padding: .5rem 1rem;
  border-radius: 0 0 var(--radius) var(--radius);
  font-size: .875rem;
  font-weight: 600;
  z-index: 200;
  transition: top 160ms ease;
}

.skip-nav:focus {
  top: 0;
  outline: 3px solid var(--blue-light);
  outline-offset: 2px;
}

/* ── Nav logo ────────────────────────────────────────────────────────────── */
.nav__logo {
  height: 44px;
  width: auto;
  display: block;
}

/* ── ADA accessibility toggle ────────────────────────────────────────────── */
.ada-toggle {
  font-size: .72rem;
  font-weight: 700;
  color: var(--gray-700);
  background: var(--gray-100);
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius);
  padding: .25rem .55rem;
  cursor: pointer;
  letter-spacing: .05em;
  line-height: 1.4;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.ada-toggle:hover {
  background: var(--gray-300);
  color: var(--navy);
}

.ada-toggle[aria-pressed="true"] {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}

/* ── Accessibility mode — WCAG 2.2 AA (activated via AA toggle) ──────────── */

/* Fix: hero eyebrow #4A7FC1 on --navy-deep ≈ 4.3:1 (fails AA)             */
html.accessible .hero__eyebrow    { color: #ffffff; }  /* 19:1 — passes AA+AAA */

/* Fix: nav brand tag --gray-500 on white ≈ 3.3:1 (fails AA)               */
html.accessible .nav__brand-tag   { color: var(--gray-700); } /* 8.3:1 — passes AA */

/* Lift hero subtext opacity for enhanced legibility                        */
html.accessible .hero__sub        { color: rgba(255, 255, 255, .9); }

/* Enhanced focus indicators (WCAG 2.4.7) */
html.accessible *:focus-visible {
  outline: 3px solid #1a6bbf !important;
  outline-offset: 3px !important;
  border-radius: 2px;
}

/* Minimum touch target size — 44px (WCAG 2.5.8) */
html.accessible .nav__links a,
html.accessible .ada-toggle,
html.accessible .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* ── Mobile navigation ───────────────────────────────────────────────────── */
.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: .5rem;
  color: var(--navy);
  align-items: center;
  justify-content: center;
}

.nav__hamburger {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: background var(--transition);
}

.nav__hamburger::before,
.nav__hamburger::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: transform 200ms ease;
}

.nav__hamburger::before { top: -7px; }
.nav__hamburger::after  { top:  7px; }

.nav__mobile-toggle[aria-expanded="true"] .nav__hamburger            { background: transparent; }
.nav__mobile-toggle[aria-expanded="true"] .nav__hamburger::before    { transform: translateY(7px)  rotate(45deg);  }
.nav__mobile-toggle[aria-expanded="true"] .nav__hamburger::after     { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .nav__mobile-toggle { display: flex; }

  .nav__links.nav__links--open {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
    padding: 1rem var(--pad-x) 1.25rem;
    gap: .25rem;
    z-index: 99;
    box-shadow: 0 4px 16px rgba(0,0,0,.08);
  }

  .nav__links.nav__links--open a,
  .nav__links.nav__links--open button {
    display: block;
    padding: .6rem 0;
    font-size: 1rem;
    width: 100%;
    text-align: left;
  }

  .nav__links.nav__links--open .nav__cta {
    border: none;
    padding: .6rem 0;
    border-radius: 0;
    background: none;
    color: var(--blue) !important;
  }
}