/* ============================================
   Layout — Navigation, Container, Footer
   ============================================ */

/* Container */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(8, 8, 13, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--duration-normal) var(--ease-out);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
}

.nav__logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--text-inverse);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

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

.nav__link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--accent-gradient);
  border-radius: 1px;
}

.nav__cta {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-inverse);
  background: var(--accent-gradient);
  padding: 0.5rem 1.25rem;
  border-radius: 6px;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.nav__cta:hover {
  opacity: 0.9;
  color: var(--text-inverse);
}

.nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-2);
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(8, 8, 13, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-5) var(--container-padding);
    gap: var(--space-4);
  }

  .nav__links.open {
    display: flex;
  }

  .nav__mobile-toggle {
    display: block;
  }
}

/* Main */
main {
  padding-top: 64px;
}

/* Section */
.section {
  padding: var(--space-16) 0;
  position: relative;
}

.section:first-child {
  padding-top: var(--space-16);
}

.section__label {
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-3);
}

.section__label span {
  color: var(--accent-text);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-section);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-4);
  max-width: 40ch;
}

.section__desc {
  color: var(--text-secondary);
  font-size: var(--text-body);
  max-width: 60ch;
  margin-bottom: var(--space-8);
  line-height: 1.75;
}

/* Divider */
.section__divider {
  width: 100%;
  height: 1px;
  background: var(--border-subtle);
  margin: var(--space-16) 0;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-10) 0 var(--space-8);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
}

.footer__left {
  max-width: 480px;
}

.footer__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.footer__text {
  font-size: var(--text-small);
  color: var(--text-tertiary);
  line-height: 1.7;
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__link {
  font-size: var(--text-small);
  color: var(--text-secondary);
}

.footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border-subtle);
  font-size: var(--text-micro);
  color: var(--text-tertiary);
}

.footer__ai-links {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-1) var(--space-2);
}

.footer__ai-links a {
  font-size: var(--text-micro);
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__ai-links a:hover {
  color: var(--text-secondary);
}

.footer__ai-sep {
  font-size: var(--text-micro);
  color: var(--text-tertiary);
  opacity: 0.5;
  user-select: none;
}

@media (max-width: 768px) {
  .footer__inner {
    flex-direction: column;
  }
}