/* ==========================================================================
   AETHER DESIGN SYSTEM — COMPONENTS & UI ELEMENTS
   Source: docs/04-DESIGN-SYSTEM-OFICIAL.md
   ========================================================================== */

/* 1. Surfaces */
.surface-light {
  background-color: var(--color-off-white);
  color: var(--color-deep-black);
}

.surface-dark {
  background-color: var(--color-deep-black);
  color: var(--color-off-white);
}

.surface-blue {
  background-color: var(--color-aether-blue);
  color: var(--color-off-white);
}

.surface-stone {
  background-color: var(--color-stone);
  color: var(--color-deep-black);
}

/* 2. Microtypography & Tags */
.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-code-meta);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-meta);
  color: var(--color-deep-black);
  opacity: 0.85;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.surface-dark .eyebrow,
.surface-blue .eyebrow {
  color: var(--color-sky-gray);
  opacity: 1;
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border: 1px solid var(--border-light);
  font-family: var(--font-body);
  font-size: var(--text-code-meta);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-meta);
  border-radius: var(--radius-none);
  line-height: 1;
}

.surface-dark .meta-chip,
.surface-blue .meta-chip {
  border-color: var(--border-dark);
  color: var(--color-off-white);
}

.meta-number {
  font-family: var(--font-display);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  opacity: 0.65;
}

/* 3. Buttons & CTAs */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-sm);
  min-height: 48px;
  min-width: 44px;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-size: var(--text-ui-action);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: var(--radius-none);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
  z-index: 1;
  transition: 0.3s ease all;
  white-space: nowrap;
}

/* Base button hover curtain pseudo-element */
.btn::before {
  transition: 0.5s all ease;
  position: absolute;
  top: 0;
  left: 50%;
  right: 50%;
  bottom: 0;
  opacity: 0;
  content: "";
  z-index: -1;
}

.btn:hover::before,
.btn:focus::before {
  transition: 0.5s all ease;
  left: 0;
  right: 0;
  opacity: 1;
}

.btn:active {
  transform: scale(0.96);
}

/* Primary Button (High Contrast Solid) */
.btn-primary {
  background-color: var(--color-deep-black);
  color: var(--color-off-white);
  border-color: var(--color-deep-black);
}

.btn-primary::before {
  background-color: var(--color-aether-blue);
}

.btn-primary:hover,
.btn-primary:focus {
  color: #ffffff;
  border-color: var(--color-aether-blue);
}

.surface-dark .btn-primary,
.surface-blue .btn-primary {
  background-color: var(--color-off-white);
  color: var(--color-deep-black);
  border-color: var(--color-off-white);
}

.surface-dark .btn-primary::before,
.surface-blue .btn-primary::before {
  background-color: var(--color-aether-blue);
}

.surface-dark .btn-primary:hover,
.surface-blue .btn-primary:hover,
.surface-dark .btn-primary:focus,
.surface-blue .btn-primary:focus {
  color: #ffffff;
  border-color: var(--color-aether-blue);
}

/* Primary Button (Brand Blue Accent) */
.btn-blue {
  background-color: var(--color-aether-blue);
  color: #ffffff;
  border-color: var(--color-aether-blue);
}

.btn-blue::before {
  background-color: var(--color-deep-black);
}

.btn-blue:hover,
.btn-blue:focus {
  color: #ffffff;
  border-color: var(--color-deep-black);
}

/* Secondary Button (Outlined) */
.btn-secondary {
  background-color: transparent;
  color: var(--color-deep-black);
  border-color: var(--color-deep-black);
  text-align: center;
  justify-content: center;
}

.btn-secondary::before {
  background-color: var(--color-deep-black);
}

.btn-secondary:hover,
.btn-secondary:focus {
  color: var(--color-off-white);
  border-color: var(--color-deep-black);
}

.surface-dark .btn-secondary,
.surface-blue .btn-secondary {
  color: var(--color-off-white);
  border-color: rgba(247, 247, 247, 0.4);
}

.surface-dark .btn-secondary::before,
.surface-blue .btn-secondary::before {
  background-color: var(--color-off-white);
}

.surface-dark .btn-secondary:hover,
.surface-blue .btn-secondary:hover,
.surface-dark .btn-secondary:focus,
.surface-blue .btn-secondary:focus {
  color: var(--color-deep-black);
  border-color: var(--color-off-white);
}

/* Button Header Modifier (clean separation from inline styles) */
.btn-header {
  padding: 10px 22px;
  min-height: 42px;
  font-size: 0.875rem;
}

/* Hover effects for pointer/mouse devices */
@media (hover: hover) and (pointer: fine) {
  .btn:hover::before,
  .btn:focus::before {
    transition: 0.5s all ease;
    left: 0;
    right: 0;
    opacity: 1;
  }

  .btn-primary:hover,
  .btn-primary:focus {
    color: #ffffff;
    border-color: var(--color-aether-blue);
  }

  .surface-dark .btn-primary:hover,
  .surface-blue .btn-primary:hover,
  .surface-dark .btn-primary:focus,
  .surface-blue .btn-primary:focus {
    color: #ffffff;
    border-color: var(--color-aether-blue);
  }

  .btn-blue:hover {
    color: #ffffff;
    border-color: var(--color-deep-black);
  }

  .btn-secondary:hover,
  .btn-secondary:focus {
    border-color: var(--color-deep-black);
    color: var(--color-off-white);
  }

  .surface-dark .btn-secondary:hover,
  .surface-blue .btn-secondary:hover,
  .surface-dark .btn-secondary:focus,
  .surface-blue .btn-secondary:focus {
    border-color: var(--color-off-white);
    color: var(--color-deep-black);
  }

  .link-editorial:hover .link-arrow {
    transform: translateX(4px);
  }

  .surface-dark .link-editorial:hover,
  .surface-blue .link-editorial:hover {
    color: var(--color-sky-gray);
  }
}

/* Touch feedback for coarse pointer/touch devices */
@media (hover: none) and (pointer: coarse) {
  .btn:active {
    transform: scale(0.97);
    opacity: 0.88;
  }

  .link-editorial:active {
    opacity: 0.7;
  }
}

/* Editorial Link with Animated Arrow */
.link-editorial {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-body);
  font-size: var(--text-ui-action);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  padding: 8px 0;
  position: relative;
  transition: color var(--duration-fast) var(--ease-aether);
}

.link-editorial .link-arrow {
  display: inline-block;
  transition: transform var(--duration-fast) var(--ease-aether);
}

.surface-dark .link-editorial,
.surface-blue .link-editorial {
  color: var(--color-off-white);
}

/* 4. Architectural Image Frame */
.image-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-light);
  background-color: rgba(10, 10, 10, 0.03);
  border-radius: var(--radius-none);
}

.surface-dark .image-frame,
.surface-blue .image-frame {
  border-color: var(--border-dark);
  background-color: rgba(247, 247, 247, 0.04);
}

.image-frame img,
.image-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 5. Navigation Bar */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 500;
  background-color: rgba(247, 247, 247, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
              opacity 0.35s cubic-bezier(0.22, 1, 0.36, 1),
              background-color var(--duration-standard) var(--ease-aether);
  padding-top: env(safe-area-inset-top);
}

body.nav-visible .site-header {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
}

.brand-logo {
  height: 26px;
  width: auto;
  object-fit: contain;
  display: block;
}

/* Dark mode / Dark header inverse logo */
.surface-dark .brand-logo,
.brand-logo-inverted {
  filter: brightness(0) invert(1);
}

.brand-descriptor {
  font-family: var(--font-body);
  font-size: var(--text-code-meta);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-meta);
  color: var(--color-deep-black);
  opacity: 0.6;
  border-left: 1px solid var(--border-light);
  padding-left: var(--space-md);
  display: none;
}

@media (min-width: 1024px) {
  .brand-descriptor {
    display: inline-block;
  }
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, var(--space-xl));
}

.nav-link {
  font-family: var(--font-body);
  font-size: var(--text-ui-action);
  font-weight: 400;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-deep-black);
  padding: 8px 0;
  position: relative;
  transition: color var(--duration-fast) var(--ease-aether);
}

.nav-link:hover {
  color: var(--color-aether-blue);
}

.lang-switch {
  font-family: var(--font-body);
  font-size: var(--text-code-meta);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-meta);
  padding: 6px 12px;
  border: 1px solid var(--border-light);
  color: var(--color-deep-black);
  transition: background-color var(--duration-fast) var(--ease-aether),
              border-color var(--duration-fast) var(--ease-aether);
}

.lang-switch:hover {
  border-color: var(--color-deep-black);
  background-color: rgba(10, 10, 10, 0.05);
}

/* Language Selector Dropdown */
.lang-dropdown {
  position: relative;
  display: inline-flex;
}

.lang-dropdown-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 68px;
  height: 32px;
  padding: 0 6px;
  background-color: transparent;
  border: 1px solid var(--border-light);
  color: var(--color-deep-black);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-meta);
  white-space: nowrap;
  line-height: 1;
  cursor: pointer;
  border-radius: var(--radius-none);
  user-select: none;
  transition: background-color var(--duration-fast) var(--ease-aether),
              border-color var(--duration-fast) var(--ease-aether),
              color var(--duration-fast) var(--ease-aether);
}

.lang-dropdown-toggle:hover,
.lang-dropdown.is-open .lang-dropdown-toggle {
  border-color: var(--color-deep-black);
  background-color: rgba(10, 10, 10, 0.04);
}

.lang-dropdown-arrow {
  width: 7px;
  height: 4px;
  flex-shrink: 0;
  transition: transform var(--duration-fast) var(--ease-aether);
}

.lang-dropdown.is-open .lang-dropdown-arrow {
  transform: rotate(180deg);
}

.lang-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  width: 100%;
  background-color: var(--color-off-white);
  border: 1px solid var(--border-light);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--duration-fast) var(--ease-aether),
              transform var(--duration-fast) var(--ease-aether),
              visibility var(--duration-fast) var(--ease-aether);
  z-index: 1000;
}

.lang-dropdown.is-open .lang-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-dropdown-item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 30px;
  padding: 0 6px;
  border: none;
  border-bottom: 1px solid var(--border-light-subtle);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-meta);
  white-space: nowrap;
  line-height: 1;
  color: var(--color-deep-black);
  text-decoration: none;
  background-color: transparent;
  box-sizing: border-box;
  transition: background-color var(--duration-fast) var(--ease-aether),
              color var(--duration-fast) var(--ease-aether);
}

.lang-dropdown-item:last-child {
  border-bottom: none;
}

.lang-dropdown-item:hover:not(.is-active) {
  background-color: rgba(10, 10, 10, 0.05);
  color: var(--color-aether-blue);
}

.lang-dropdown-item.is-active {
  background-color: var(--color-deep-black);
  color: var(--color-off-white);
  cursor: default;
  pointer-events: none;
}

/* Mobile Menu Controls */
.mobile-nav-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-deep-black);
  transition: transform var(--duration-standard) var(--ease-aether),
              opacity var(--duration-standard) var(--ease-aether);
  transform-origin: center;
}

/* Animated Hamburger to X when open */
.mobile-nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  height: calc(100vh - 72px);
  height: calc(100svh - 72px);
  height: calc(100dvh - 72px);
  background-color: var(--color-off-white);
  padding: var(--space-xl) max(var(--page-margin), env(safe-area-inset-right)) max(var(--space-2xl), env(safe-area-inset-bottom)) max(var(--page-margin), env(safe-area-inset-left));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  border-top: 1px solid var(--border-light);
  z-index: 499;
}

.mobile-drawer.is-open {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 3vh, var(--space-xl));
}

.mobile-menu-links .nav-link {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 4.5vw, 1.5rem);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border-light-subtle);
}

.mobile-menu-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.mobile-menu-footer .btn {
  width: 100%;
}

.mobile-menu-footer .lang-switch {
  text-align: center;
  display: block;
}

@media (max-width: 1023px) {
  .nav-desktop {
    display: none;
  }
  .mobile-nav-toggle {
    display: flex;
  }
}

/* Smartphone viewport adaptations (<= 767px) */
@media (max-width: 767px) {
  .btn-group {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    margin-inline: auto;
    box-sizing: border-box;
  }

  .btn-group .btn {
    width: 100%;
    white-space: normal;
    text-align: center;
    justify-content: center;
  }

  .btn-group .link-editorial {
    justify-content: center;
    width: 100%;
    text-align: center;
  }
}