/* ==========================================================================
   OMNI COLOR — LAYOUT STYLESHEET
   File: assets/css/layout.css
   Purpose: App shell, header, footer, containers, grid, sidebar, mobile nav
   Author: Omni Color
   Version: 1.0.0
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. APP SHELL
   -------------------------------------------------------------------------- */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  background-color: var(--surface-base);
}

.app-main {
  flex: 1 0 auto;
  width: 100%;
  padding-top: var(--header-height);
}

.app-main--no-header-offset {
  padding-top: 0;
}

.app-footer {
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   2. HEADER
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  width: 100%;
  height: var(--header-height);
  background-color: var(--surface-glass);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 40rem) {
  .site-header__inner {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 64rem) {
  .site-header__inner {
    padding-inline: var(--space-8);
  }
}

/* Header — scrolled state */
.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

/* --------------------------------------------------------------------------
   3. BRAND / LOGO
   -------------------------------------------------------------------------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  color: var(--text-primary);
  font-weight: var(--fw-bold);
  font-size: var(--fs-lg);
  letter-spacing: var(--ls-tight);
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.brand:hover {
  color: var(--text-primary);
  opacity: 0.85;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-md);
  background: var(--gradient-brand);
  flex-shrink: 0;
  box-shadow: var(--shadow-xs);
}

.brand__mark svg {
  width: 1.25rem;
  height: 1.25rem;
  color: #ffffff;
}

.brand__name {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
  white-space: nowrap;
}

.brand__name-primary {
  color: var(--text-primary);
}

.brand__name-secondary {
  color: var(--brand-primary);
}

@media (max-width: 30rem) {
  .brand__name {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   4. PRIMARY NAVIGATION (DESKTOP)
   -------------------------------------------------------------------------- */
.site-nav {
  display: none;
  align-items: center;
  gap: var(--space-1);
  margin-inline: auto;
}

@media (min-width: 64rem) {
  .site-nav {
    display: flex;
  }
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.site-nav__link:hover {
  color: var(--text-primary);
  background-color: var(--surface-muted);
}

.site-nav__link[aria-current="page"],
.site-nav__link.is-active {
  color: var(--brand-primary);
  background-color: var(--brand-primary-soft);
}

.site-nav__link svg {
  width: 0.875rem;
  height: 0.875rem;
  opacity: 0.7;
  transition: transform var(--duration-fast) var(--ease-out);
}

.site-nav__item.is-open .site-nav__link svg {
  transform: rotate(180deg);
}

/* --------------------------------------------------------------------------
   5. DROPDOWN MENU (DESKTOP)
   -------------------------------------------------------------------------- */
.site-nav__dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 15rem;
  padding: var(--space-2);
  background-color: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    visibility var(--duration-fast) var(--ease-out);
  z-index: var(--z-dropdown);
}

.site-nav__item.is-open .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-nav__dropdown--wide {
  min-width: 32rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-1);
}

.site-nav__dropdown-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__dropdown-link {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.site-nav__dropdown-link:hover {
  background-color: var(--surface-muted);
  color: var(--text-primary);
}

.site-nav__dropdown-link svg {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  margin-top: 3px;
  color: var(--brand-primary);
}

.site-nav__dropdown-title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
  line-height: 1.3;
}

.site-nav__dropdown-desc {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  line-height: 1.4;
  margin-top: 2px;
}

.site-nav__dropdown-heading {
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--text-tertiary);
}

/* --------------------------------------------------------------------------
   6. HEADER ACTIONS
   -------------------------------------------------------------------------- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

@media (min-width: 64rem) {
  .header-actions {
    margin-left: 0;
  }
}

.header-actions__divider {
  display: none;
  width: 1px;
  height: 1.5rem;
  background-color: var(--border-subtle);
  margin-inline: var(--space-1);
}

@media (min-width: 40rem) {
  .header-actions__divider {
    display: block;
  }
}

/* --------------------------------------------------------------------------
   7. ICON BUTTON (HEADER)
   -------------------------------------------------------------------------- */
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  background-color: transparent;
  transition: background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.icon-button:hover {
  background-color: var(--surface-muted);
  color: var(--text-primary);
}

.icon-button:active {
  transform: scale(0.96);
}

.icon-button svg {
  width: 1.25rem;
  height: 1.25rem;
}

.icon-button--sm {
  width: 2rem;
  height: 2rem;
}

.icon-button--sm svg {
  width: 1rem;
  height: 1rem;
}

.icon-button--lg {
  width: 2.75rem;
  height: 2.75rem;
}

.icon-button--lg svg {
  width: 1.375rem;
  height: 1.375rem;
}

/* --------------------------------------------------------------------------
   8. MENU TOGGLE (MOBILE)
   -------------------------------------------------------------------------- */
.menu-toggle {
  display: inline-flex;
}

@media (min-width: 64rem) {
  .menu-toggle {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   9. THEME TOGGLE
   -------------------------------------------------------------------------- */
.theme-toggle {
  position: relative;
}

.theme-toggle svg {
  transition: transform var(--duration-normal) var(--ease-spring),
    opacity var(--duration-fast) var(--ease-out);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.theme-toggle .icon-moon {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(-90deg) scale(0.6);
}

.theme-toggle .icon-sun {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0) scale(1);
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(90deg) scale(0.6);
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0) scale(1);
}

/* --------------------------------------------------------------------------
   10. SEARCH TRIGGER (HEADER)
   -------------------------------------------------------------------------- */
.search-trigger {
  display: none;
  align-items: center;
  gap: var(--space-2);
  height: 2.5rem;
  padding: 0 var(--space-3);
  min-width: 14rem;
  border-radius: var(--radius-md);
  background-color: var(--surface-muted);
  border: 1px solid transparent;
  color: var(--text-tertiary);
  font-size: var(--fs-sm);
  transition: background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.search-trigger:hover {
  background-color: var(--surface-sunken);
  border-color: var(--border-default);
}

.search-trigger svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.search-trigger__label {
  flex: 1;
  text-align: left;
}

.search-trigger__kbd {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px 6px;
  font-size: 0.6875rem;
  font-weight: var(--fw-medium);
  color: var(--text-tertiary);
  background-color: var(--surface-base);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

@media (min-width: 64rem) {
  .search-trigger {
    display: inline-flex;
  }
}

/* --------------------------------------------------------------------------
   11. MOBILE NAVIGATION DRAWER
   -------------------------------------------------------------------------- */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  justify-content: flex-end;
  pointer-events: none;
  visibility: hidden;
}

.mobile-drawer.is-open {
  pointer-events: auto;
  visibility: visible;
}

.mobile-drawer__backdrop {
  position: absolute;
  inset: 0;
  background-color: var(--surface-overlay);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.mobile-drawer.is-open .mobile-drawer__backdrop {
  opacity: 1;
}

.mobile-drawer__panel {
  position: relative;
  width: min(20rem, 88vw);
  height: 100%;
  background-color: var(--surface-raised);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
}

.mobile-drawer.is-open .mobile-drawer__panel {
  transform: translateX(0);
}

.mobile-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.mobile-drawer__body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: var(--space-4);
  -webkit-overflow-scrolling: touch;
}

.mobile-drawer__footer {
  flex-shrink: 0;
  padding: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

/* Mobile nav — search */
.mobile-search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 2.75rem;
  padding: 0 var(--space-3);
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  background-color: var(--surface-muted);
  border: 1px solid var(--border-subtle);
  color: var(--text-tertiary);
  font-size: var(--fs-sm);
  width: 100%;
  text-align: left;
}

.mobile-search svg {
  width: 1rem;
  height: 1rem;
}

/* Mobile nav — sections */
.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.mobile-nav__section {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav__heading {
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--text-tertiary);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.mobile-nav__link:hover,
.mobile-nav__link[aria-current="page"] {
  background-color: var(--surface-muted);
  color: var(--text-primary);
}

.mobile-nav__link svg {
  width: 1.125rem;
  height: 1.125rem;
  color: var(--brand-primary);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   12. SEARCH OVERLAY (MODAL)
   -------------------------------------------------------------------------- */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: var(--space-4);
  padding-top: 12vh;
  background-color: var(--surface-overlay);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-fast) var(--ease-out),
    visibility var(--duration-fast) var(--ease-out);
}

.search-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.search-overlay__panel {
  width: 100%;
  max-width: 36rem;
  background-color: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  transform: translateY(-12px) scale(0.98);
  transition: transform var(--duration-fast) var(--ease-spring);
  display: flex;
  flex-direction: column;
  max-height: 76vh;
}

.search-overlay.is-open .search-overlay__panel {
  transform: translateY(0) scale(1);
}

.search-overlay__input-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
}

.search-overlay__input-wrap svg {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.search-overlay__input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: var(--fs-md);
  color: var(--text-primary);
}

.search-overlay__input::placeholder {
  color: var(--text-tertiary);
}

.search-overlay__esc {
  padding: 2px 6px;
  font-size: 0.6875rem;
  font-weight: var(--fw-medium);
  color: var(--text-tertiary);
  background-color: var(--surface-muted);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  cursor: pointer;
}

.search-overlay__results {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: var(--space-2);
}

.search-overlay__empty {
  padding: var(--space-8) var(--space-4);
  text-align: center;
  color: var(--text-tertiary);
  font-size: var(--fs-sm);
}

/* --------------------------------------------------------------------------
   13. SECTION SYSTEM
   -------------------------------------------------------------------------- */
.section {
  padding-block: var(--space-16);
}

@media (min-width: 48rem) {
  .section {
    padding-block: var(--space-20);
  }
}

@media (min-width: 64rem) {
  .section {
    padding-block: var(--space-24);
  }
}

.section--sm {
  padding-block: var(--space-12);
}

.section--lg {
  padding-block: var(--space-24);
}

@media (min-width: 64rem) {
  .section--lg {
    padding-block: var(--space-32);
  }
}

.section--sunken {
  background-color: var(--surface-sunken);
}

.section--muted {
  background-color: var(--surface-muted);
}

.section--bordered {
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section__header {
  max-width: 44rem;
  margin-bottom: var(--space-10);
}

.section__header--center {
  margin-inline: auto;
  text-align: center;
}

.section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--brand-primary);
  background-color: var(--brand-primary-soft);
  border-radius: var(--radius-full);
}

.section__title {
  font-size: clamp(1.75rem, 2.5vw + 1rem, 2.5rem);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-tighter);
  line-height: var(--lh-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.section__subtitle {
  font-size: var(--fs-lg);
  line-height: var(--lh-relaxed);
  color: var(--text-secondary);
  max-width: 42rem;
}

.section__header--center .section__subtitle {
  margin-inline: auto;
}

.section__footer {
  margin-top: var(--space-10);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}

/* --------------------------------------------------------------------------
   14. GRID SYSTEM
   -------------------------------------------------------------------------- */
.grid-auto-sm {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: var(--space-4);
}

.grid-auto-md {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: var(--space-5);
}

.grid-auto-lg {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(22rem, 1fr));
  gap: var(--space-6);
}

.grid-auto-xl {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(26rem, 1fr));
  gap: var(--space-6);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 40rem) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 64rem) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Two-column split */
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 64rem) {
  .split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-12);
  }

  .split--sidebar {
    grid-template-columns: 17.5rem minmax(0, 1fr);
  }

  .split--sidebar-right {
    grid-template-columns: minmax(0, 1fr) 17.5rem;
  }

  .split--wide-left {
    grid-template-columns: 1.4fr 1fr;
  }

  .split--wide-right {
    grid-template-columns: 1fr 1.4fr;
  }
}

/* --------------------------------------------------------------------------
   15. STICKY SIDEBAR LAYOUT
   -------------------------------------------------------------------------- */
.docs-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
  padding-block: var(--space-8);
}

@media (min-width: 40rem) {
  .docs-layout {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 64rem) {
  .docs-layout {
    grid-template-columns: 15rem minmax(0, 1fr);
    gap: var(--space-10);
    padding-inline: var(--space-8);
    padding-block: var(--space-12);
  }
}

@media (min-width: 80rem) {
  .docs-layout--with-toc {
    grid-template-columns: 15rem minmax(0, 1fr) 15rem;
  }
}

.docs-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-6));
  align-self: start;
  max-height: calc(100vh - var(--header-height) - var(--space-12));
  overflow-y: auto;
  padding-right: var(--space-2);
}

.docs-toc {
  position: sticky;
  top: calc(var(--header-height) + var(--space-6));
  align-self: start;
  max-height: calc(100vh - var(--header-height) - var(--space-12));
  overflow-y: auto;
}

.docs-content {
  min-width: 0;
}

/* --------------------------------------------------------------------------
   16. BREADCRUMBS
   -------------------------------------------------------------------------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  font-size: var(--fs-sm);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-tertiary);
}

.breadcrumbs__item a {
  color: var(--text-secondary);
}

.breadcrumbs__item a:hover {
  color: var(--text-primary);
}

.breadcrumbs__item[aria-current="page"] {
  color: var(--text-primary);
  font-weight: var(--fw-medium);
}

.breadcrumbs__sep {
  width: 0.875rem;
  height: 0.875rem;
  color: var(--text-disabled);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   17. PAGE HEADER
   -------------------------------------------------------------------------- */
.page-header {
  padding-block: var(--space-10) var(--space-8);
}

@media (min-width: 48rem) {
  .page-header {
    padding-block: var(--space-12) var(--space-10);
  }
}

.page-header__title {
  font-size: clamp(1.875rem, 3vw + 1rem, 2.75rem);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-tighter);
  line-height: var(--lh-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  text-wrap: balance;
}

.page-header__subtitle {
  font-size: var(--fs-lg);
  line-height: var(--lh-relaxed);
  color: var(--text-secondary);
  max-width: 48rem;
}

.page-header__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-5);
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
}

.page-header__meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.page-header__meta-item svg {
  width: 0.875rem;
  height: 0.875rem;
}

/* --------------------------------------------------------------------------
   18. FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--surface-sunken);
  border-top: 1px solid var(--border-subtle);
  margin-top: var(--space-16);
}

.site-footer__main {
  padding-block: var(--space-12) var(--space-8);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 40rem) {
  .site-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 64rem) {
  .site-footer__grid {
    grid-template-columns: 2fr repeat(4, minmax(0, 1fr));
    gap: var(--space-10);
  }
}

.site-footer__brand {
  max-width: 22rem;
}

.site-footer__brand .brand {
  margin-bottom: var(--space-4);
}

.site-footer__brand p {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
}

.site-footer__social {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.site-footer__column-title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

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

.site-footer__links a {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: 1.4;
}

.site-footer__links a:hover {
  color: var(--brand-primary);
}

.site-footer__bottom {
  padding-block: var(--space-6);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-footer__copyright {
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.site-footer__legal a {
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
}

.site-footer__legal a:hover {
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   19. BACK-TO-TOP BUTTON
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  z-index: var(--z-fixed);
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-full);
  background-color: var(--brand-primary);
  color: var(--neutral-0);
  box-shadow: var(--shadow-lg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    visibility var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--brand-primary-hover);
  color: var(--neutral-0);
}

.back-to-top svg {
  width: 1.125rem;
  height: 1.125rem;
}

@media (min-width: 48rem) {
  .back-to-top {
    right: var(--space-6);
    bottom: var(--space-6);
  }
}

/* --------------------------------------------------------------------------
   20. TOAST CONTAINER
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: center;
  pointer-events: none;
  width: min(24rem, calc(100vw - var(--space-8)));
}

@media (min-width: 48rem) {
  .toast-container {
    left: auto;
    right: var(--space-6);
    bottom: var(--space-6);
    transform: none;
    align-items: flex-end;
  }
}

/* --------------------------------------------------------------------------
   21. HERO LAYOUT
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: var(--space-12) var(--space-16);
  overflow: hidden;
}

@media (min-width: 48rem) {
  .hero {
    padding-block: var(--space-16) var(--space-20);
  }
}

@media (min-width: 64rem) {
  .hero {
    padding-block: var(--space-20) var(--space-24);
  }
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: center;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 40rem) {
  .hero__inner {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 64rem) {
  .hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: var(--space-16);
    padding-inline: var(--space-8);
  }
}

.hero__content {
  max-width: 36rem;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  margin-bottom: var(--space-5);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--brand-primary);
  background-color: var(--brand-primary-soft);
  border-radius: var(--radius-full);
}

.hero__eyebrow svg {
  width: 0.75rem;
  height: 0.75rem;
}

.hero__title {
  font-size: clamp(2.25rem, 4vw + 1rem, 3.75rem);
  font-weight: var(--fw-extrabold);
  letter-spacing: var(--ls-tighter);
  line-height: var(--lh-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-5);
  text-wrap: balance;
}

.hero__subtitle {
  font-size: var(--fs-lg);
  line-height: var(--lh-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  max-width: 34rem;
  text-wrap: pretty;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-subtle);
}

.hero__meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
}

.hero__meta-item svg {
  width: 1rem;
  height: 1rem;
  color: var(--success-600);
  flex-shrink: 0;
}

.hero__visual {
  position: relative;
  width: 100%;
}

/* --------------------------------------------------------------------------
   22. BACKGROUND DECORATION
   -------------------------------------------------------------------------- */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--border-subtle) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border-subtle) 1px, transparent 1px);
  background-size: 3rem 3rem;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 40%, transparent 100%);
  pointer-events: none;
  opacity: 0.55;
}

[data-theme="dark"] .bg-grid {
  opacity: 0.35;
}

.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  pointer-events: none;
  z-index: -1;
}

.bg-glow--brand {
  width: 32rem;
  height: 32rem;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.55), transparent 70%);
  top: -8rem;
  right: -8rem;
}

.bg-glow--accent {
  width: 28rem;
  height: 28rem;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.45), transparent 70%);
  bottom: -6rem;
  left: -6rem;
}

.bg-glow--secondary {
  width: 24rem;
  height: 24rem;
  background: radial-gradient(circle, rgba(20, 184, 166, 0.4), transparent 70%);
  top: 40%;
  left: 40%;
}

/* --------------------------------------------------------------------------
   23. RESPONSIVE HELPERS
   -------------------------------------------------------------------------- */
@media (max-width: 47.99rem) {
  .hide-mobile {
    display: none !important;
  }
}

@media (min-width: 48rem) and (max-width: 63.99rem) {
  .hide-tablet {
    display: none !important;
  }
}

@media (min-width: 64rem) {
  .hide-desktop {
    display: none !important;
  }
}

.show-mobile {
  display: block;
}

@media (min-width: 48rem) {
  .show-mobile {
    display: none !important;
  }
}

/* --------------------------------------------------------------------------
   24. OVERFLOW X CONTAINER
   -------------------------------------------------------------------------- */
.scroll-x {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding-bottom: var(--space-2);
}

.scroll-x::-webkit-scrollbar {
  height: 6px;
}

/* --------------------------------------------------------------------------
   25. STICKY TOOLBAR
   -------------------------------------------------------------------------- */
.sticky-bar {
  position: sticky;
  top: var(--header-height);
  z-index: var(--z-sticky);
  background-color: var(--surface-glass);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

/* --------------------------------------------------------------------------
   26. SPLIT PANEL (TOOL LAYOUT)
   -------------------------------------------------------------------------- */
.tool-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 64rem) {
  .tool-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: var(--space-8);
  }

  .tool-layout--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

  .tool-layout--even {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .tool-layout--sidebar {
    grid-template-columns: 20rem minmax(0, 1fr);
  }
}

/* --------------------------------------------------------------------------
   27. ASPECT RATIO BOXES
   -------------------------------------------------------------------------- */
.aspect-square {
  aspect-ratio: 1 / 1;
}

.aspect-video {
  aspect-ratio: 16 / 9;
}

.aspect-wide {
  aspect-ratio: 21 / 9;
}

.aspect-portrait {
  aspect-ratio: 3 / 4;
}

/* --------------------------------------------------------------------------
   28. PRINT LAYOUT
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .site-footer,
  .back-to-top,
  .toast-container,
  .mobile-drawer,
  .search-overlay {
    display: none !important;
  }

  .app-main {
    padding-top: 0 !important;
  }

  .container,
  .container-wide,
  .container-max {
    max-width: 100% !important;
    padding-inline: 0 !important;
  }

  .section {
    padding-block: var(--space-6) !important;
  }
}

/* --------------------------------------------------------------------------
   29. CONTAINER QUERY SUPPORT (progressive)
   -------------------------------------------------------------------------- */
@supports (container-type: inline-size) {
  .cq-container {
    container-type: inline-size;
  }

  @container (min-width: 28rem) {
    .cq-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }
  }
}

/* --------------------------------------------------------------------------
   30. SAFE AREA INSETS (iOS)
   -------------------------------------------------------------------------- */
@supports (padding: max(0px)) {
  .site-header__inner,
  .site-footer__main,
  .site-footer__bottom,
  .container {
    padding-left: max(var(--space-4), env(safe-area-inset-left));
    padding-right: max(var(--space-4), env(safe-area-inset-right));
  }

  .mobile-drawer__panel {
    padding-bottom: env(safe-area-inset-bottom);
  }
}

/* --------------------------------------------------------------------------
   END OF FILE
   -------------------------------------------------------------------------- */