html {
  scroll-behavior: smooth;
}

main {
  position: relative;
  z-index: 1;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section-title {
  font-size: var(--fs-h3);
  letter-spacing: -.02em;
}

.section-head {
  margin-bottom: var(--space-xl);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: #0a0909;
  transition: border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: #0d0d14;
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-heading);
  font-weight: 700;
  font-size: var(--fs-h5);
}

.site-logo img {
  height: 32px;
  width: auto;
}

.nav {
  display: none;
}

.nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  margin: 0;
  padding: 0;
}

.nav a {
  color: var(--color-body);
  font-size: var(--fs-small);
  font-weight: 500;
}

.nav a:hover {
  color: var(--color-heading);
}

.nav.is-open {
  display: block;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  padding: var(--space-lg) var(--container-padding);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  overflow-y: auto;
}

.nav.is-open ul {
  flex-direction: column;
  gap: var(--space-md);
}

.nav.is-open a {
  font-size: var(--fs-body);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header-cta {
  display: none;
}

@media (min-width: 576px) {
  .header-cta {
    display: inline-flex;
  }
}

.burger {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
}

.burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-heading);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
  border-radius: var(--radius-sm);
  background: var(--gradient-accent);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  text-decoration: none;
}

.btn > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 32px;
  border-radius: 6px;
  background: var(--color-bg);
  color: var(--color-heading);
  font-weight: 500;
  font-size: var(--fs-small);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(224, 24, 255, 0.3);
  color: var(--color-heading);
}

.btn:hover > span {
  background: transparent;
  color: var(--color-heading);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.08);
}

.btn--ghost > span {
  background: rgba(10, 9, 9, 0.4);
}

.site-footer {
  padding: 64px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background: var(--color-bg);
}

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

.footer-col h4 {
  font-size: var(--fs-h6);
  margin-bottom: var(--space-sm);
  color: var(--color-heading);
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-col a {
  color: var(--color-ternary);
  font-size: var(--fs-small);
}

.footer-col a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--color-ternary);
  font-size: var(--fs-small);
}

.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mt-64 { margin-top: 64px; }
.mt-80 { margin-top: 80px; }

.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }
.mb-64 { margin-bottom: 64px; }
.mb-80 { margin-bottom: 80px; }

@media (min-width: 576px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 992px) {
  .section {
    padding: 120px 0;
  }

  .section-title {
    font-size: var(--fs-h2);
  }

  .nav {
    display: block;
  }

  .burger {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

@media (min-width: 1200px) {
  .container {
    padding: 0 32px;
  }
}