/* =========================================================
   DESIGN TOKENS
   ========================================================= */
:root {
  --color-bg:        #0A0F1E;
  --color-accent:    #6366F1;
  --color-secondary: #22D3EE;
  --color-text:      #F8FAFC;
  --color-muted:     #94A3B8;
  --color-surface:   #111827;
  --color-border:    #1E2A3A;

  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

  --radius-card: 1.25rem;
  --radius-btn:  0.5rem;

  --transition-base: 0.3s ease;

  --max-width: 1140px;
  --section-pad: clamp(5rem, 9vw, 8rem);
}

/* =========================================================
   RESET & BASE
   ========================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  width: 90%;
  max-width: var(--max-width);
  margin-inline: auto;
}

/* =========================================================
   TYPOGRAPHY UTILITIES
   ========================================================= */
.gradient-text {
  background: linear-gradient(90deg, var(--color-accent), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.eyebrow {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.eyebrow--light {
  color: var(--color-secondary);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 3.5rem;
}

/* =========================================================
   BUTTONS
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-btn);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.55);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-large {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}

/* =========================================================
   HEADER
   ========================================================= */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 30, 0.8);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 68px;
}

/* Logo */
.logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  flex-shrink: 0;
}

.logo-accent {
  color: var(--color-accent);
}

/* Nav */
.main-nav {
  margin-left: auto;
}

.main-nav ul {
  display: flex;
  gap: 2rem;
}

.main-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-muted);
  transition: color var(--transition-base);
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

/* Header CTA */
.header-cta {
  flex-shrink: 0;
  font-size: 0.875rem;
  padding: 0.5rem 1.1rem;
}

/* Hamburger button */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
  z-index: 110;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Hamburger → X animation */
.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

/* Decorative background blobs */
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.28;
}

.blob-1 {
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, var(--color-accent), transparent 70%);
  top: -10%;
  left: -8%;
}

.blob-2 {
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, var(--color-secondary), transparent 70%);
  bottom: 5%;
  right: -6%;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-block: clamp(6rem, 12vw, 9rem);
  max-width: 760px;
}

.hero-content .eyebrow {
  margin-bottom: 1.25rem;
}

.hero-content h1 {
  font-size: clamp(2.6rem, 6.5vw, 4.75rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-sub {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--color-muted);
  max-width: 560px;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* =========================================================
   SERVICES
   ========================================================= */
#services {
  padding-block: var(--section-pad);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

/* Service card */
.service-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-accent);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.15);
}

/* Featured card */
.service-card--featured {
  border-color: var(--color-accent);
  box-shadow: 0 0 35px rgba(99, 102, 241, 0.22);
}

.service-card--featured:hover {
  box-shadow: 0 12px 48px rgba(99, 102, 241, 0.35);
}

/* Badge */
.card-badge {
  position: absolute;
  top: -0.7rem;
  right: 1.5rem;
  background: linear-gradient(90deg, var(--color-accent), var(--color-secondary));
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.85rem;
  border-radius: 999px;
}

/* Card icon */
.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 0.875rem;
  background: rgba(99, 102, 241, 0.12);
  color: var(--color-accent);
  flex-shrink: 0;
}

.service-card:hover .card-icon {
  background: rgba(99, 102, 241, 0.2);
}

/* Card heading */
.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* Card body */
.service-card p {
  font-size: 0.92rem;
  color: var(--color-muted);
  line-height: 1.75;
  flex: 1;
}

/* Card link */
.card-link {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-top: 0.25rem;
  transition: color var(--transition-base), gap var(--transition-base);
}

.card-link:hover {
  color: var(--color-secondary);
}

/* =========================================================
   CTA STRIP
   ========================================================= */
.cta-strip {
  padding-block: var(--section-pad);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(34, 211, 238, 0.06) 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.cta-inner {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
}

.cta-inner h2 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.cta-sub {
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 2.25rem;
}

/* =========================================================
   FOOTER
   ========================================================= */
footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: 3rem 2.5rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
}

.footer-brand {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.footer-tagline {
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* Social icons */
.social-nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.social-nav a {
  color: var(--color-muted);
  transition: color var(--transition-base), transform var(--transition-base);
}

.social-nav a:hover {
  color: var(--color-secondary);
  transform: translateY(-3px);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-border);
  margin-top: 0.5rem;
}

/* =========================================================
   SCROLL-TRIGGERED FADE-IN
   ========================================================= */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================
   RESPONSIVE — TABLET (≤ 900px)
   ========================================================= */
@media (max-width: 900px) {
  /* Show hamburger, hide desktop nav + header CTA */
  .nav-toggle {
    display: flex;
  }

  .header-cta {
    display: none;
  }

  .main-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(10, 15, 30, 0.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.35s ease;
    margin-left: 0;
  }

  .main-nav.nav-open {
    max-height: 300px;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
  }

  .main-nav ul li a {
    display: block;
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
    color: var(--color-text);
  }

  .main-nav a::after {
    display: none;
  }

  /* Services single column on narrow grids */
  .services-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-inline: auto;
  }
}

/* =========================================================
   RESPONSIVE — MOBILE (≤ 480px)
   ========================================================= */
@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .btn-large {
    width: 100%;
    justify-content: center;
  }
}