body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  z-index: 1000;
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-4);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-16) 0;
}

.section--alt {
  background-color: var(--color-bg-alt);
  padding: var(--space-16) 0;
}

.section__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-8);
  text-align: center;
  color: var(--color-text);
}

.section__content {
  max-width: 52rem;
  margin: 0 auto var(--space-8);
}

.section__content p {
  margin-bottom: var(--space-4);
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text);
}

.subsection__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-top: var(--space-12);
  margin-bottom: var(--space-6);
  text-align: center;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  color: var(--color-text);
  padding: var(--space-20) 0;
  text-align: center;
}

.hero__title {
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  line-height: 1.2;
}

.hero__subtitle {
  font-size: var(--text-xl);
  opacity: 0.9;
  margin-bottom: var(--space-8);
  max-width: 40rem;
  margin-left: auto;
  margin-right: auto;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-header-bg);
  backdrop-filter: blur(0.5rem);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header__nav {
  display: flex;
  align-items: center;
  margin-left: 2rem;
  height: 100%;
}

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

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
  height: 100%;
}

.header__logo-icon {
  font-size: var(--text-2xl);
}

.header__burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-2);
  align-items: center;
  height: 100%;
}

.header__burger-line {
  display: block;
  width: 1.5rem;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

/* Nav */
.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  height: 100%;
}

.nav-list__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-list__link:hover,
.nav-list__link:focus {
  color: var(--color-primary);
}

.nav-list__link--accent {
  color: var(--color-accent);
  font-weight: 600;
}

/* Page layout — main content only */
.page-layout {
  display: grid;
  grid-template-columns: 1fr;
}

/* Main content takes full width */
.page-layout > .main {
  grid-column: 1;
  min-width: 0;
}



/* Scroll reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger cards within sections */
.reveal.is-visible .card {
  animation: card-fade-in 0.5s ease both;
}

.reveal.is-visible .card:nth-child(1) { animation-delay: 0.1s; }
.reveal.is-visible .card:nth-child(2) { animation-delay: 0.2s; }
.reveal.is-visible .card:nth-child(3) { animation-delay: 0.3s; }
.reveal.is-visible .card:nth-child(4) { animation-delay: 0.4s; }
.reveal.is-visible .card:nth-child(5) { animation-delay: 0.5s; }
.reveal.is-visible .card:nth-child(6) { animation-delay: 0.6s; }

@keyframes card-fade-in {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Checklist items stagger */
.reveal.is-visible .checklist__item {
  animation: card-fade-in 0.4s ease both;
}

.reveal.is-visible .checklist__item:nth-child(1) { animation-delay: 0.05s; }
.reveal.is-visible .checklist__item:nth-child(2) { animation-delay: 0.1s; }
.reveal.is-visible .checklist__item:nth-child(3) { animation-delay: 0.15s; }
.reveal.is-visible .checklist__item:nth-child(4) { animation-delay: 0.2s; }
.reveal.is-visible .checklist__item:nth-child(5) { animation-delay: 0.25s; }
.reveal.is-visible .checklist__item:nth-child(6) { animation-delay: 0.3s; }
.reveal.is-visible .checklist__item:nth-child(7) { animation-delay: 0.35s; }
.reveal.is-visible .checklist__item:nth-child(8) { animation-delay: 0.4s; }

/* Footer */
.footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: var(--space-12) 0 var(--space-6);
}

.footer__inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.footer__heading {
  font-size: var(--text-lg);
  font-weight: 600;
  color: #fff;
  margin-bottom: var(--space-4);
}

.footer__text {
  font-size: var(--text-sm);
  line-height: 1.6;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-footer-text);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: #fff;
}

.footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid hsl(0deg 0% 100% / 10%);
  text-align: center;
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  font-size: var(--text-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  z-index: 50;
}

.back-to-top:hover {
  transform: scale(1.1);
}

.back-to-top[hidden] {
  display: none;
}

/* Mobile overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgb(0 0 0 / 60%);
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

body.menu-open::before {
  opacity: 1;
  pointer-events: auto;
}

/* Responsive */
@media (max-width: 48rem) {
  .header__burger {
    display: flex;
  }

  .header__burger.is-active .header__burger-line:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .header__burger.is-active .header__burger-line:nth-child(2) {
    opacity: 0;
  }

  .header__burger.is-active .header__burger-line:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
  }

  .header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    height: 100vh;
    background: var(--color-bg);
    padding: var(--space-6);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base);
    z-index: 100;
    overflow-y: auto;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: var(--space-2);
  }

  .nav-list__link {
    display: block;
    padding: var(--space-5);
    font-size: var(--text-xl);
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast), color var(--transition-fast);
  }

  .nav-list__link:hover,
  .nav-list__link:focus {
    background: var(--color-card-hover);
    color: var(--color-primary);
  }

  .nav-list__link--accent {
    color: var(--color-accent);
  }

  .hero__title {
    font-size: var(--text-3xl);
  }

  .hero__subtitle {
    font-size: var(--text-lg);
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .section__title {
    font-size: var(--text-2xl);
  }
}