/* ===================================
   Terro AI - Layout Styles
   =================================== */

/* Page Wrapper */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page-wrapper main {
  flex: 1;
}

/* ===================================
   Header
   =================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(18, 18, 26, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-fixed);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
  background: rgba(18, 18, 26, 0.95);
  box-shadow: var(--shadow-lg);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  text-decoration: none;
}

.header__logo img,
.header__logo svg {
  height: 40px;
  width: auto;
}

/* Navigation */
.nav {
  display: none;
}

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

.nav__link {
  position: relative;
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

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

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

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

/* Mobile Menu Button */
.header__menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: var(--z-modal);
}

.header__menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header__menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.header__menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.header__menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation */
.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 320px;
  background: var(--color-bg-medium);
  padding: calc(var(--header-height) + var(--space-8)) var(--space-6) var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  z-index: var(--z-modal-backdrop);
  overflow-y: auto;
}

.mobile-nav.open {
  transform: translateX(0);
}

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

.mobile-nav__link {
  display: block;
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  background: var(--color-bg-light);
  color: var(--color-primary);
}

/* Mobile Nav Overlay */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  z-index: var(--z-modal-backdrop);
}

.mobile-nav-overlay.open {
  opacity: 1;
  visibility: visible;
}

body.menu-open {
  overflow: hidden;
}

/* Desktop Navigation */
@media (min-width: 768px) {
  .nav {
    display: block;
  }

  .header__menu-btn {
    display: none;
  }

  .mobile-nav,
  .mobile-nav-overlay {
    display: none;
  }
}

/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--color-bg-dark);
  border-top: 1px solid var(--color-border);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.footer__grid {
  display: grid;
  gap: var(--space-12);
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.footer__logo img,
.footer__logo svg {
  height: 36px;
  width: auto;
}

.footer__tagline {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.footer__nav-group h4 {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__nav-link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__nav-link:hover {
  color: var(--color-primary);
}

.footer__social {
  display: flex;
  gap: var(--space-4);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-bg-light);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.footer__social-link:hover {
  background: var(--color-primary);
  color: var(--color-bg-dark);
}

.footer__social-link svg {
  width: 20px;
  height: 20px;
}

.footer__bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  text-align: center;
}

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

/* Footer Desktop */
@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 1.5fr 2fr 1fr;
    align-items: start;
  }

  .footer__nav {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

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

.section--hero {
  padding-top: calc(var(--header-height) + var(--space-16));
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.section--dark {
  background: var(--color-bg-dark);
}

.section--medium {
  background: var(--color-bg-medium);
}

.section--gradient {
  background: var(--gradient-primary);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section__title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-inline: auto;
}

@media (min-width: 768px) {
  .section {
    padding: var(--space-24) 0;
  }

  .section__title {
    font-size: var(--text-4xl);
  }
}