/* ==========================================================================
   Enable AI — Real-World AI Solutions
   Design system: clean, modern, professional. No gradients, no clutter.
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand colors */
  --navy: #1A1F2B;
  --enable-blue: #2D6CDF;
  --enable-blue-hover: #2558b8;
  --soft-gray: #F2F4F7;
  --medium-gray: #6B7280;
  --white: #FFFFFF;
  --border: #E5E7EB;

  /* Typography */
  --font-heading: "Montserrat", "Inter", "Source Sans Pro", system-ui, -apple-system, Segoe UI, Helvetica, Arial, sans-serif;
  --font-body: "Open Sans", "Lato", "Roboto", system-ui, -apple-system, Segoe UI, Helvetica, Arial, sans-serif;

  /* Layout */
  --max-width: 1100px;
  --section-padding-desktop: 100px;
  --section-padding-mobile: 60px;

  /* Effects */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 6px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
  --transition: 180ms ease;
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--navy);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--enable-blue-hover);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--navy);
  margin: 0 0 0.5em;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.45rem); }
h4 { font-size: 1.1rem; }

p {
  margin: 0 0 1em;
}

p.lead {
  font-size: 1.125rem;
  color: var(--medium-gray);
  max-width: 720px;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section--alt {
  background: var(--soft-gray);
}

.section--navy {
  background: var(--navy);
  color: var(--white);
}

.section--navy h1,
.section--navy h2,
.section--navy h3 {
  color: var(--white);
}

.section--navy p {
  color: rgba(255, 255, 255, 0.85);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--enable-blue);
  margin-bottom: 14px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  font-family: var(--font-heading);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

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

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

.btn--secondary {
  background: transparent;
  color: var(--enable-blue);
  border-color: var(--enable-blue);
}

.btn--secondary:hover {
  background: var(--enable-blue);
  color: var(--white);
}

.btn--on-navy {
  background: var(--white);
  color: var(--navy);
  border-color: var(--white);
}

.btn--on-navy:hover {
  background: var(--enable-blue);
  color: var(--white);
  border-color: var(--enable-blue);
}

.btn--small {
  padding: 10px 18px;
  font-size: 0.9rem;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.nav__logo {
  height: 44px;
  width: auto;
  display: block;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.98rem;
  color: var(--navy);
  padding: 8px 4px;
  position: relative;
}

.nav__link:hover {
  color: var(--enable-blue);
}

.nav__link.is-active {
  color: var(--enable-blue);
}

.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  bottom: 0;
  height: 2px;
  background: var(--enable-blue);
  border-radius: 2px;
}

.nav__cta {
  margin-left: 8px;
}

.nav__toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: 8px;
  cursor: pointer;
  color: var(--navy);
}

.nav__toggle svg {
  width: 28px;
  height: 28px;
  display: block;
}

/* ---------- Hero ---------- */
.hero {
  padding: 90px 0 100px;
  background: var(--white);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

.hero__title {
  font-size: clamp(2.2rem, 4.6vw, 3.4rem);
  margin-bottom: 20px;
}

.hero__subtitle {
  font-size: 1.18rem;
  color: var(--medium-gray);
  max-width: 540px;
  margin-bottom: 32px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero__art {
  width: 100%;
  height: auto;
  max-width: 460px;
  margin-left: auto;
}

/* ---------- Cards (services, pillars) ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(45, 108, 223, 0.25);
}

.card__icon {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(45, 108, 223, 0.1);
  color: var(--enable-blue);
  margin-bottom: 18px;
}

.card__icon svg {
  width: 26px;
  height: 26px;
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  color: var(--medium-gray);
  margin-bottom: 18px;
}

.card__link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.card__link::after {
  content: "→";
  transition: transform var(--transition);
}

.card__link:hover::after {
  transform: translateX(3px);
}

/* ---------- Pillars (Approach) ---------- */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 48px;
}

.pillar {
  text-align: left;
}

.pillar__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--enable-blue);
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 16px;
}

.pillar h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.pillar p {
  color: var(--medium-gray);
  margin: 0;
}

/* ---------- Section heading group ---------- */
.section-head {
  max-width: 720px;
}

.section-head--center {
  text-align: center;
  margin: 0 auto;
}

/* ---------- About preview ---------- */
.about-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

/* ---------- Bottom CTA ---------- */
.cta-band {
  text-align: center;
}

.cta-band h2 {
  margin-bottom: 12px;
}

.cta-band p {
  margin: 0 auto 28px;
  max-width: 600px;
}

/* ---------- Services Page ---------- */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 56px;
  align-items: start;
  padding: 56px 0;
  border-bottom: 1px solid var(--border);
}

.service-block:last-child {
  border-bottom: 0;
}

.service-block__label {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--enable-blue);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.service-block h2 {
  margin-top: 6px;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
}

.service-block ul {
  margin: 0;
  padding-left: 18px;
}

.service-block ul li {
  margin-bottom: 8px;
  color: var(--medium-gray);
}

.service-block ul li::marker {
  color: var(--enable-blue);
}

/* ---------- About Page ---------- */
.about-hero {
  padding: 90px 0 60px;
}

.about-body {
  max-width: 760px;
  margin: 0 auto;
  font-size: 1.08rem;
  color: #2c3340;
}

.about-body p {
  margin-bottom: 1.4em;
}

.about-signature {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 36px;
  font-family: var(--font-heading);
}

.about-signature dt {
  font-weight: 600;
  color: var(--medium-gray);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.about-signature dd {
  margin: 0;
  color: var(--navy);
  font-weight: 500;
}

/* ---------- Contact Page ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: start;
}

.form {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.form__row {
  margin-bottom: 18px;
}

.form__label {
  display: block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 6px;
  color: var(--navy);
}

.form__label .optional {
  color: var(--medium-gray);
  font-weight: 400;
  font-size: 0.85rem;
  margin-left: 4px;
}

.form__input,
.form__textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
  color: var(--navy);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--enable-blue);
  box-shadow: 0 0 0 3px rgba(45, 108, 223, 0.15);
}

.form__textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-info {
  background: var(--soft-gray);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.contact-info h3 {
  margin-bottom: 16px;
}

.contact-info dl {
  margin: 0;
}

.contact-info dt {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--medium-gray);
  margin-top: 16px;
}

.contact-info dt:first-child {
  margin-top: 0;
}

.contact-info dd {
  margin: 4px 0 0;
  font-size: 1.05rem;
  font-weight: 500;
}

.contact-info dd a {
  color: var(--navy);
}

.contact-info dd a:hover {
  color: var(--enable-blue);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.78);
  padding: 64px 0 28px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer__brand-logo {
  height: 50px;
  width: auto;
  background: var(--white);
  padding: 6px 10px;
  border-radius: 8px;
  margin-bottom: 16px;
  display: inline-block;
}

.footer__tagline {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
  max-width: 320px;
  margin: 0;
}

.footer__heading {
  font-family: var(--font-heading);
  color: var(--white);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 14px;
}

.footer__links,
.footer__contact {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__links li,
.footer__contact li {
  margin-bottom: 8px;
  font-size: 0.96rem;
}

.footer__links a,
.footer__contact a {
  color: rgba(255, 255, 255, 0.78);
}

.footer__links a:hover,
.footer__contact a:hover {
  color: var(--white);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer__legal {
  display: flex;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__legal a {
  color: rgba(255, 255, 255, 0.6);
}

.footer__legal a:hover {
  color: var(--white);
}

/* ---------- Page Hero (small banner used on inner pages) ---------- */
.page-hero {
  padding: 90px 0 60px;
  background: var(--soft-gray);
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  margin-bottom: 14px;
}

.page-hero p {
  color: var(--medium-gray);
  font-size: 1.1rem;
  max-width: 720px;
  margin: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero {
    padding: 60px 0 70px;
  }

  .hero__grid,
  .about-preview,
  .contact-grid,
  .service-block {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero__art {
    max-width: 360px;
    margin: 0 auto;
    order: -1;
  }

  .cards,
  .pillars {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

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

  .nav {
    height: 68px;
  }

  .nav__list {
    position: fixed;
    inset: 68px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    padding: 12px 24px 24px;
    transform: translateY(-110%);
    transition: transform 220ms ease;
  }

  .nav__list.is-open {
    transform: translateY(0);
  }

  .nav__list li {
    border-bottom: 1px solid var(--border);
  }

  .nav__list li:last-child {
    border-bottom: 0;
    padding-top: 12px;
  }

  .nav__link {
    display: block;
    padding: 14px 4px;
    font-size: 1.05rem;
  }

  .nav__cta {
    margin-left: 0;
    width: 100%;
  }

  .nav__toggle {
    display: inline-flex;
  }

  .cards,
  .pillars {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .form,
  .contact-info {
    padding: 24px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .page-hero {
    padding: 60px 0 40px;
  }
}

/* ---------- Reduce motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ---------- Focus visibility ---------- */
:focus-visible {
  outline: 3px solid rgba(45, 108, 223, 0.5);
  outline-offset: 2px;
  border-radius: 4px;
}