/* ============================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================================ */
:root {
  /* Colors */
  --color-bg:          #0d0d0d;
  --color-bg-2:        #111111;
  --color-bg-3:        #161616;
  --color-surface:     #1a1a1a;
  --color-border:      #2a2a2a;
  --color-text:        #e8e8e8;
  --color-text-muted:  #888888;
  --color-text-faint:  #555555;
  --color-accent:      #7c3aed;
  --color-accent-dim:  rgba(124, 58, 237, 0.15);
  --color-accent-glow: rgba(124, 58, 237, 0.35);
  --color-white:       #ffffff;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               Helvetica, Arial, sans-serif;

  /* Spacing scale */
  --space-xs:  0.5rem;
  --space-sm:  0.75rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --container-max: 1120px;
  --container-pad: 1.5rem;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  /* Nav height */
  --nav-height: 64px;
}


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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea {
  font-family: inherit;
}


/* ============================================================
   UTILITY — CONTAINER
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}


/* ============================================================
   UTILITY — FADE-IN (JS-driven scroll reveal)
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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


/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  transition: background var(--transition-base),
              color var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-fast);
  cursor: pointer;
}

.btn:active {
  transform: scale(0.97);
}

/* Primary button */
.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-white);
  border: 1px solid var(--color-accent);
}

.btn--primary:hover {
  background-color: #6d28d9;
  border-color: #6d28d9;
  box-shadow: 0 0 24px var(--color-accent-glow);
}

/* Ghost button */
.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--color-text-muted);
  background-color: rgba(255,255,255,0.04);
}

/* Full-width */
.btn--full {
  width: 100%;
}


/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: rgba(13, 13, 13, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base),
              background-color var(--transition-base);
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
  background-color: rgba(13, 13, 13, 0.96);
}

.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-white);
  transition: color var(--transition-fast);
}

.nav__logo:hover {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

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

.nav__link:hover::after {
  width: 100%;
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.nav__hamburger:hover {
  background-color: var(--color-surface);
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base),
              opacity var(--transition-base),
              width var(--transition-base);
  transform-origin: center;
}

/* Hamburger open state */
.nav__hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger.open span:nth-child(2) {
  opacity: 0;
  width: 0;
}

.nav__hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}


/* ============================================================
   SECTION SHARED
   ============================================================ */
.section {
  padding-block: var(--space-5xl);
}

.section__label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.section__title {
  font-size: clamp(1.875rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-white);
  margin-bottom: var(--space-lg);
}

.section__desc {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 560px;
  line-height: 1.7;
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.section__header .section__desc {
  margin-inline: auto;
}


/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero__inner {
  position: relative;
  z-index: 1;
  padding-block: var(--space-5xl);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.375rem 0.875rem;
  background-color: var(--color-accent-dim);
  border: 1px solid rgba(124, 58, 237, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: #a78bfa;
  letter-spacing: 0.03em;
  margin-bottom: var(--space-xl);
}

.hero__headline {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--color-white);
  margin-bottom: var(--space-xl);
}

.hero__headline .accent {
  color: var(--color-accent);
  position: relative;
}

.hero__sub {
  font-size: clamp(1rem, 2vw, 1.1875rem);
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 520px;
  margin-bottom: var(--space-2xl);
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* Background orb */
.hero__orb {
  position: absolute;
  top: -200px;
  right: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(
    circle at center,
    rgba(124, 58, 237, 0.18) 0%,
    transparent 65%
  );
  pointer-events: none;
  border-radius: 50%;
}


/* ============================================================
   SERVICES
   ============================================================ */
.services {
  background-color: var(--color-bg-2);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

/* Service Card */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: border-color var(--transition-base),
              transform var(--transition-base),
              box-shadow var(--transition-base);
}

.card:hover {
  border-color: rgba(124, 58, 237, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4),
              0 0 0 1px rgba(124, 58, 237, 0.1);
}

.card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-dim);
  border: 1px solid rgba(124, 58, 237, 0.25);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.card__title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.card__body {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}


/* ============================================================
   ABOUT
   ============================================================ */
.about {
  background-color: var(--color-bg);
}

.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

.about__body {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-lg);
}

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.stat {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: border-color var(--transition-base);
}

.stat:hover {
  border-color: rgba(124, 58, 237, 0.3);
}

.stat__number {
  display: block;
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat__label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}


/* ============================================================
   CONTACT
   ============================================================ */
.contact {
  background-color: var(--color-bg-2);
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: start;
}

.contact__desc {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-2xl);
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact__details li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.contact__details svg {
  flex-shrink: 0;
  color: var(--color-accent);
}

/* Form */
.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form__label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

.form__input {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.9375rem;
  line-height: 1.5;
  outline: none;
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base);
  -webkit-appearance: none;
}

.form__input::placeholder {
  color: var(--color-text-faint);
}

.form__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

.form__status {
  font-size: 0.9375rem;
  text-align: center;
  min-height: 1.5em;
}

.form__status.success {
  color: #4ade80;
}

.form__status.error {
  color: #f87171;
}


/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-3xl) var(--space-xl);
}

.footer__inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2xl);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.footer__tagline {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.footer__links {
  display: flex;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.footer__link {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-text);
}

.footer__social {
  display: flex;
  gap: var(--space-md);
}

.social__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color var(--transition-fast),
              border-color var(--transition-fast),
              background var(--transition-fast);
}

.social__link:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
  background-color: var(--color-surface);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-xl);
  font-size: 0.875rem;
  color: var(--color-text-faint);
  text-align: center;
}


/* ============================================================
   RESPONSIVE — TABLET
   ============================================================ */
@media (max-width: 900px) {
  .services__grid {
    grid-template-columns: 1fr 1fr;
  }

  .about__inner {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
  }

  .contact__inner {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
  }
}


/* ============================================================
   RESPONSIVE — MOBILE
   ============================================================ */
@media (max-width: 640px) {
  :root {
    --container-pad: 1.25rem;
    --space-5xl: 5rem;
  }

  /* Mobile nav */
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(13, 13, 13, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity var(--transition-base),
                transform var(--transition-base);
  }

  .nav__links.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav__link {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text);
  }

  /* Hero */
  .hero__cta {
    flex-direction: column;
  }

  .hero__cta .btn {
    width: 100%;
  }

  /* Services */
  .services__grid {
    grid-template-columns: 1fr;
  }

  /* About stats */
  .about__stats {
    grid-template-columns: 1fr 1fr;
  }

  /* Footer */
  .footer__inner {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .footer__links {
    gap: var(--space-lg);
  }
}


/* ============================================================
   STAGGERED ANIMATION DELAYS (for cards/stats groupings)
   ============================================================ */
.services__grid .card:nth-child(2) {
  transition-delay: 0.1s;
}

.services__grid .card:nth-child(3) {
  transition-delay: 0.2s;
}

.about__stats .stat:nth-child(2) {
  transition-delay: 0.1s;
}

.about__stats .stat:nth-child(3) {
  transition-delay: 0.2s;
}

.about__stats .stat:nth-child(4) {
  transition-delay: 0.3s;
}