/* Section-specific styles */

/* --- Noise texture overlay --- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

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

/* Hero ambient gradient */
.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse at center, rgba(20, 79, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: center;
  position: relative;
}

@media (min-width: 992px) {
  .hero .container {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }
}

.hero__content {
  max-width: 560px;
}

.hero__problem {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  line-height: var(--line-height-base);
}

.hero__headline {
  font-size: var(--font-size-hero);
  font-family: var(--font-heading);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.hero__typewriter-wrap {
  min-height: 3.5rem;
  margin-bottom: var(--space-lg);
}

.hero__typewriter {
  font-size: var(--font-size-2xl);
  color: var(--color-accent);
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: var(--line-height-tight);
}

.hero__typewriter::after {
  content: '';
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--color-accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero__body {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  line-height: var(--line-height-base);
  margin-bottom: var(--space-lg);
  max-width: 500px;
}

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

@media (max-width: 991px) {
  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + var(--space-xl));
    padding-bottom: var(--space-xl);
  }

  .hero__typewriter-wrap {
    min-height: 5rem;
  }

  .hero__typewriter {
    font-size: var(--font-size-xl);
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
    text-align: center;
  }
}

/* --- Section rhythm: alternating backgrounds --- */
.problem {
  background: var(--color-surface);
  padding: var(--space-2xl) 0;
  position: relative;
}

.problem .card {
  background: var(--color-surface-raised);
}

.platform {
  background: var(--color-bg);
  padding: var(--space-2xl) 0;
}

.how-it-works {
  background: var(--color-surface);
  padding: var(--space-2xl) 0;
  position: relative;
}

.architecture {
  background: var(--color-bg);
  padding: var(--space-3xl) 0;
  position: relative;
}

@media (max-width: 768px) {
  .problem { padding: var(--space-xl) 0; }
  .platform { padding: var(--space-xl) 0; }
  .how-it-works { padding: var(--space-xl) 0; }
  .architecture { padding: var(--space-xl) 0; }
}

/* --- Problem --- */
.problem .section__title {
  font-family: var(--font-heading);
}

/* --- Platform --- */
.platform .section__title {
  font-family: var(--font-heading);
}

/* Hero platform card — full-width accent treatment */
.card--hero {
  grid-column: 1 / -1;
  position: relative;
  border-top: 2px solid var(--color-accent);
  background: linear-gradient(
    180deg,
    rgba(20, 79, 255, 0.06) 0%,
    var(--color-surface-raised) 40%
  );
}

.card--hero .card__title {
  font-size: var(--font-size-2xl);
}

/* --- How It Works --- */
.how-it-works .section__title {
  font-family: var(--font-heading);
}

/* --- Architecture --- */
.architecture .section__header {
  margin-bottom: var(--space-xl);
}

.architecture__lead {
  font-size: var(--font-size-2xl);
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: var(--line-height-tight);
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-md);
}

.architecture__quote {
  font-size: var(--font-size-sm);
  font-style: italic;
  color: var(--color-text-subtle);
  text-align: center;
  margin-bottom: var(--space-xl);
}

/* --- CTA Banner --- */
.cta-banner {
  background:
    linear-gradient(135deg, #0d3ad9 0%, var(--color-accent) 40%, #2960ff 100%);
  padding: var(--space-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* CTA texture layer */
.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(255, 255, 255, 0.04) 0%, transparent 40%);
  pointer-events: none;
}

.cta-banner__headline {
  font-size: var(--font-size-3xl);
  font-family: var(--font-heading);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
  position: relative;
}

.cta-banner__trust {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-lg);
  position: relative;
}

.cta-banner .btn {
  position: relative;
}

.cta-banner__sub {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  margin-top: var(--space-md);
  position: relative;
}

@media (max-width: 768px) {
  .cta-banner {
    padding: var(--space-xl) 0;
  }

  .cta-banner__headline {
    font-size: var(--font-size-2xl);
  }
}

/* --- Footer --- */
.footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 2.5fr 1fr 1fr 1fr;
  }
}

.footer__brand-name {
  font-size: var(--font-size-xl);
  font-family: var(--font-heading);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.footer__brand-tagline {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-md);
}

.footer__socials {
  display: flex;
  gap: var(--space-sm);
}

.footer__social {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  color: var(--color-text-subtle);
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

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

.footer__heading {
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-md);
}

.footer__link {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-lg);
  font-size: var(--font-size-xs);
  color: var(--color-text-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.footer__bottom-sep {
  opacity: 0.4;
}

.footer__bottom-link {
  color: var(--color-text-subtle);
  transition: color var(--transition-fast);
}

.footer__bottom-link:hover {
  color: var(--color-text-muted);
}