/* ---------- Design tokens ---------- */
:root {
  --dark-blue: #2E52A2;
  --light-blue: #5CBAE9;
  --ink: #12213f;
  --ink-soft: #4a5773;
  --bg: #ffffff;
  --bg-soft: #f5f8fc;
  --border: #e3e9f3;
  --gradient: linear-gradient(120deg, var(--dark-blue) 0%, var(--light-blue) 100%);
  --gradient-soft: linear-gradient(135deg, rgba(46,82,162,0.08) 0%, rgba(92,186,233,0.10) 100%);
  --shadow-sm: 0 2px 10px rgba(18,33,63,0.06);
  --shadow-md: 0 10px 30px rgba(18,33,63,0.10);
  --shadow-lg: 0 20px 60px rgba(18,33,63,0.14);
  --radius: 16px;
  --radius-sm: 10px;
  --font-head: 'Outfit', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --header-h: 76px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--ink);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h2 { font-size: clamp(1.9rem, 3.2vw, 2.6rem); }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.1rem; }

p { color: var(--ink-soft); }

a { color: inherit; text-decoration: none; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 14px;
}

.section-heading {
  max-width: 640px;
  margin: 0 auto 56px;
  text-align: center;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, color 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--dark-blue);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--light-blue); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn-ghost {
  background: transparent;
  color: var(--dark-blue);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--dark-blue); background: var(--bg-soft); }

.btn-small { padding: 10px 20px; font-size: 0.85rem; }
.btn-full { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: #ffffff;
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand { display: flex; align-items: center; }
.brand-logo { height: 38px; width: auto; }

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}
.main-nav a {
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  transition: color 0.2s ease;
}
.main-nav a:not(.btn) { color: var(--ink-soft); }
.main-nav a:not(.btn):hover { color: var(--dark-blue); }
.main-nav a:not(.btn)::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--gradient);
  transition: width 0.25s ease;
}
.main-nav a:not(.btn):hover::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 110px) 0 130px;
  overflow: hidden;
  background:
    linear-gradient(100deg, rgba(6,14,34,0.82) 0%, rgba(6,14,34,0.55) 40%, rgba(6,14,34,0.15) 65%),
    url('../assets/hero-ai-brain.png');
  background-size: cover;
  background-position: right center;
}

.hero-inner { position: relative; }

.hero-copy { max-width: 600px; }

.hero .eyebrow {
  background: none;
  -webkit-text-fill-color: initial;
  color: var(--light-blue);
}

.hero h1 {
  color: #fff;
  font-size: clamp(2.4rem, 5.4vw, 3.8rem);
  margin-bottom: 22px;
}

.hero-sub {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.15rem;
  max-width: 560px;
  margin-bottom: 36px;
}

.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-cta .btn-primary { background: #fff; color: var(--dark-blue); }
.hero-cta .btn-primary:hover { background: var(--light-blue); color: #fff; }

.hero-cta .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.5); }
.hero-cta .btn-ghost:hover { background: rgba(255, 255, 255, 0.1); border-color: #fff; }

/* ---------- About ---------- */
.about { padding: 110px 0; }

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}

.about-copy h2 { margin-bottom: 20px; }
.about-copy p { margin-bottom: 16px; }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.stat-card {
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.stat-number {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.7rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-label { font-size: 0.9rem; color: var(--ink-soft); }

/* ---------- Services ---------- */
.services { padding: 110px 0; background: var(--bg-soft); }

.services-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
}

.service-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  flex: 1 1 320px;
  max-width: 372px;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.service-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
}
.service-icon svg { width: 100%; height: 100%; }

.service-card h3 { margin-bottom: 10px; font-size: 1.2rem; }
.service-card p { font-size: 0.96rem; }

/* ---------- Why ---------- */
.why { padding: 110px 0; }

.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.why-card {
  border-top: 3px solid;
  border-image: var(--gradient) 1;
  padding-top: 20px;
}
.why-num {
  display: block;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.6rem;
  color: var(--light-blue);
  margin-bottom: 10px;
}
.why-card h4 { margin-bottom: 10px; }
.why-card p { font-size: 0.95rem; }

/* ---------- Contact ---------- */
.contact { padding: 110px 0 130px; background: var(--bg-soft); }

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-copy h2 { margin-bottom: 18px; }
.contact-copy > p { margin-bottom: 32px; max-width: 460px; }

.contact-details { list-style: none; display: flex; flex-direction: column; gap: 20px; }
.contact-details li { display: flex; flex-direction: column; gap: 4px; }
.contact-label {
  font-family: var(--font-head);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dark-blue);
}
.contact-details a, .contact-details span:not(.contact-label) {
  font-size: 1.02rem;
  color: var(--ink);
}
.contact-details em { color: #9aa6bd; font-style: normal; font-size: 0.85rem; }

.contact-form {
  position: relative;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-row { display: flex; flex-direction: column; gap: 8px; }
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.form-row label {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
}
.form-row input,
.form-row select,
.form-row textarea {
  font-family: var(--font-body);
  font-size: 0.96rem;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  color: var(--ink);
  transition: border-color 0.2s ease, background 0.2s ease;
  resize: vertical;
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--light-blue);
  background: #fff;
}

.form-note {
  font-size: 0.9rem;
  color: var(--dark-blue);
  min-height: 1.2em;
  font-weight: 600;
}

/* ---------- Footer ---------- */
.site-footer {
  background: #101b34;
  padding: 56px 0;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
}
.footer-logo {
  height: 34px;
  filter: brightness(0) invert(1);
  opacity: 0.92;
}
.footer-tagline { color: #b7c2dc; font-size: 0.95rem; }
.footer-copy { color: #7484a8; font-size: 0.85rem; }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .about-grid, .contact-inner { grid-template-columns: 1fr; gap: 40px; }
  .why-grid { grid-template-columns: 1fr 1fr; }
  .hero-copy { max-width: 100%; }
}

@media (max-width: 600px) {
  .hero { background-position: 70% center; }
}

@media (max-width: 480px) {
  .service-card { flex-basis: 100%; }
}

@media (max-width: 720px) {
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px 28px;
    gap: 18px;
    box-shadow: var(--shadow-md);
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .main-nav a:not(.btn) { padding: 6px 0; }
  .main-nav .btn { align-self: flex-start; }
  .nav-toggle { display: flex; }

  .hero { padding: calc(var(--header-h) + 64px) 0 72px; }
  .about, .services, .why, .contact { padding: 76px 0; }
  .why-grid { grid-template-columns: 1fr; }
  .contact-form { padding: 26px; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; align-items: stretch; }
  .about-stats { grid-template-columns: 1fr; }
}