/* Apple-platform readiness -------------------------------------------------
   This layer is intentionally last in the cascade. It keeps Liquid Glass on
   navigation and transient controls, while content surfaces remain solid and
   legible. */

:root {
  --control-min: 44px;
  --page-gutter: clamp(16px, 2.4vw, 32px);
  --glass-control: color-mix(in srgb, var(--surface-raised) 76%, transparent);
  --glass-control-border: color-mix(in srgb, var(--line) 72%, white 10%);
  --tabbar-height: 72px;
}

html {
  min-height: 100%;
  background: var(--canvas);
  scrollbar-gutter: stable;
  -webkit-overflow-scrolling: touch;
}

body {
  min-height: 100svh;
  overscroll-behavior-x: none;
}

.site-shell,
.site-shell > main {
  min-width: 0;
}

.container {
  width: min(1444px, 100%);
  margin-inline: auto;
  padding-left: max(var(--page-gutter), var(--safe-left));
  padding-right: max(var(--page-gutter), var(--safe-right));
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  margin: -1px !important;
  padding: 0 !important;
  border: 0 !important;
  clip: rect(0 0 0 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
}

button,
a,
summary,
input,
select,
textarea {
  -webkit-tap-highlight-color: transparent;
}

button:not(:disabled):active,
a:active,
summary:active {
  opacity: 0.82;
}

.button,
.auth-submit,
.auth-provider {
  min-height: var(--control-min);
}

.icon-button {
  width: var(--control-min);
  height: var(--control-min);
}

textarea {
  field-sizing: content;
}

/* Navigation is the elevated functional layer. */
.site-header {
  min-height: calc(74px + var(--safe-top));
  background:
    radial-gradient(circle at 12% -180%, rgba(96, 195, 234, 0.22), transparent 320px),
    radial-gradient(circle at 85% 230%, rgba(139, 102, 218, 0.2), transparent 380px),
    color-mix(in srgb, var(--header-bg) 94%, transparent);
  box-shadow: 0 8px 28px rgba(4, 7, 12, 0.16);
  backdrop-filter: blur(34px) saturate(155%);
  -webkit-backdrop-filter: blur(34px) saturate(155%);
}

.site-header__inner.container {
  width: min(1444px, 100%);
}

.desktop-nav {
  gap: 3px;
  padding: 4px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.035);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.055);
}

.desktop-nav__link {
  min-height: 42px;
  padding-inline: clamp(10px, 1.25vw, 17px);
  border-radius: 999px;
}

.desktop-nav__link::after {
  display: none;
}

.desktop-nav__link:hover {
  background: rgba(255, 255, 255, 0.055);
}

.desktop-nav__link.is-active {
  background:
    linear-gradient(145deg, rgba(109, 184, 237, 0.12), rgba(137, 105, 218, 0.13)),
    rgba(255, 255, 255, 0.07);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.12), 0 5px 16px rgba(0, 0, 0, 0.12);
}

.language-menu summary,
.theme-toggle,
.mobile-menu__trigger {
  min-width: var(--control-min);
  min-height: var(--control-min);
}

.theme-toggle {
  min-width: 70px;
  min-height: var(--control-min);
}

.language-menu__popover,
.mobile-menu__popover {
  background: var(--glass-control);
  backdrop-filter: blur(34px) saturate(160%);
  -webkit-backdrop-filter: blur(34px) saturate(160%);
}

@media (min-width: 1081px) and (max-width: 1280px) {
  .site-header__inner {
    grid-template-columns: 154px auto 154px;
  }

  .brand {
    width: 154px;
  }

  .brand img {
    width: 170px;
  }

  .desktop-nav__link {
    padding-inline: 9px;
    font-size: 0.66rem;
  }

  .header-login {
    display: none;
  }

  .site-header .header-cta {
    padding-inline: 13px;
  }
}

/* Phone and compact iPad navigation. */
@media (max-width: 1080px) {
  :root {
    --page-gutter: clamp(14px, 3.2vw, 24px);
  }

  .site-shell > main {
    padding-bottom: calc(var(--tabbar-height) + 18px + var(--safe-bottom));
  }

  .site-header__inner.container {
    width: 100%;
  }

  .site-header .header-login,
  .site-header .header-cta,
  .site-header .header-account-avatar {
    display: none;
  }

  .site-header .brand {
    flex: 0 0 auto;
  }

  .mobile-menu__popover {
    top: calc(72px + var(--safe-top));
    right: max(12px, var(--safe-right));
    width: min(380px, calc(100vw - max(24px, var(--safe-left) + var(--safe-right))));
    max-height: calc(100dvh - 168px - var(--safe-top) - var(--safe-bottom));
    overscroll-behavior: contain;
  }

  .mobile-tabs {
    right: max(12px, var(--safe-right));
    bottom: max(9px, var(--safe-bottom));
    left: max(12px, var(--safe-left));
    width: auto;
    min-height: var(--tabbar-height);
    padding: 6px;
    border: 1px solid var(--glass-control-border);
    border-radius: 25px;
    background: var(--glass-control);
    box-shadow:
      0 18px 48px rgba(8, 10, 16, 0.2),
      inset 0 1px color-mix(in srgb, white 42%, transparent);
    backdrop-filter: blur(30px) saturate(160%);
    -webkit-backdrop-filter: blur(30px) saturate(160%);
  }

  .mobile-tabs__item {
    min-height: 58px;
    gap: 3px;
    border-radius: 19px;
  }

  .mobile-tabs__item::before {
    top: 4px;
    width: 18px;
  }

  .mobile-tab-icon {
    width: 22px;
    height: 22px;
    fill: none;
    stroke: currentcolor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.65;
  }

  .mobile-tabs small {
    font-size: 0.62rem;
    font-weight: 740;
  }

  input:not([type="checkbox"]):not([type="radio"]):not([type="range"]),
  select,
  textarea {
    font-size: 16px !important;
  }

  .calculator-page.container,
  .account-page.container,
  .print-toolbar.container,
  .print-instructions.container,
  .print-page-summary.container {
    width: min(100%, 1024px);
  }

  .calculator-grid {
    min-height: 0;
  }

  .drawing-panel {
    min-height: clamp(440px, 68svh, 680px);
  }

  .result-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .result-row {
    padding-inline: 12px;
    border-left: 1px solid var(--line-soft);
  }

  .result-row:nth-child(3n + 1) {
    border-left: 0;
  }

}

@media (max-width: 620px) {
  .mobile-tabs {
    right: 0;
    bottom: 0;
    left: 0;
    min-height: calc(66px + var(--safe-bottom));
    padding: 5px max(6px, var(--safe-right)) max(5px, var(--safe-bottom)) max(6px, var(--safe-left));
    border-right: 0;
    border-bottom: 0;
    border-left: 0;
    border-radius: 24px 24px 0 0;
  }

  .mobile-tabs__item {
    min-height: 56px;
    border-radius: 17px;
  }

  .result-list {
    grid-template-columns: 1fr;
  }

  .result-row,
  .result-row:nth-child(3n + 1) {
    border-left: 0;
  }

  .natural-stone-dialog-backdrop,
  .dialog-backdrop {
    align-items: end;
    padding:
      max(12px, var(--safe-top))
      max(12px, var(--safe-right))
      max(12px, var(--safe-bottom))
      max(12px, var(--safe-left));
  }

  .natural-stone-dialog,
  .info-dialog {
    width: 100%;
    max-height: calc(100dvh - max(24px, var(--safe-top) + var(--safe-bottom)));
    overflow-y: auto;
    overscroll-behavior: contain;
    border-radius: 26px;
  }

  .natural-stone-dialog footer {
    position: sticky;
    bottom: -18px;
    padding-block: 10px 4px;
    background: linear-gradient(transparent, rgba(245, 251, 252, 0.98) 30%);
  }
}

@media (max-width: 1080px) and (max-height: 560px) and (orientation: landscape) {
  .site-shell > main {
    padding-right: calc(78px + var(--safe-right));
    padding-bottom: 18px;
  }

  .mobile-tabs {
    top: calc(78px + var(--safe-top));
    right: max(8px, var(--safe-right));
    bottom: auto;
    left: auto;
    width: 64px;
    min-height: 0;
    grid-template-columns: 1fr;
    padding: 5px;
    border: 1px solid var(--glass-control-border);
    border-radius: 22px;
  }

  .mobile-tabs__item {
    min-height: 50px;
    border-radius: 17px;
  }

  .mobile-tabs__item::before,
  .mobile-tabs small {
    display: none;
  }

  .mobile-tab-icon {
    width: 21px;
    height: 21px;
  }

}

@media (pointer: coarse) {
  button:not(.mobile-menu__backdrop),
  summary,
  select,
  a.button,
  .arch-tab,
  .setting-out-toggle,
  .stone-method-options button,
  .wall-masonry-toggle,
  .calculator-print-button,
  .natural-stone-dialog header button {
    min-height: var(--control-min);
  }

  .calculator-print-button,
  .natural-stone-dialog header button {
    min-width: var(--control-min);
  }
}

/* Content surfaces and compact-window stability. */
.calculator-access {
  min-height: calc(100dvh - 250px);
}

.account-panel,
.account-card,
.auth-portal__grid {
  box-shadow: var(--shadow);
}

.not-found {
  display: grid;
  min-height: calc(100dvh - 190px);
  place-items: center;
  align-content: center;
  padding-block: 72px;
  text-align: center;
}

.not-found > span {
  color: var(--sapphire);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 820;
  letter-spacing: 0.18em;
}

.not-found h1 {
  max-width: 14ch;
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.7rem, 7vw, 5.8rem);
  font-weight: 610;
  letter-spacing: -0.065em;
  line-height: 0.94;
}

.not-found p {
  max-width: 46ch;
  margin: 18px 0 27px;
  color: var(--muted);
}

/* On iPhone the bottom workspace tabs are the navigation. Removing the site
   header and decorative sheet outline leaves the usable drawing area clear. */
@media (max-width: 680px) {
  body:has(.calculator-page) .site-header {
    display: none;
  }

  body:has(.calculator-page) .site-footer {
    display: none;
  }

  .calculator-page.container {
    width: 100%;
    padding-top: 0;
    padding-right: max(0px, var(--safe-right));
    padding-bottom: max(0px, var(--safe-bottom));
    padding-left: max(0px, var(--safe-left));
  }

  .calculator-workbench {
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .calculator-workbench::before {
    display: none;
  }
}

/* Screen previews must remain reachable on compact iPads. */
@media (max-width: 850px) {
  .print-sheets {
    justify-content: start;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
  }

  .print-sheet {
    flex: 0 0 auto;
    scroll-snap-align: start;
  }
}

/* Theme persistence is initialized in the document head. These overrides
   finish the token migration for the shared calculator/account surfaces. */
:root[data-theme="dark"] .calculator-topbar,
:root[data-theme="dark"] .input-panel,
:root[data-theme="dark"] .drawing-panel,
:root[data-theme="dark"] .results-panel,
:root[data-theme="dark"] .top-gable-input,
:root[data-theme="dark"] .top-gable-drawing-panel,
:root[data-theme="dark"] .top-gable-results,
:root[data-theme="dark"] .account-panel,
:root[data-theme="dark"] .account-card {
  background:
    radial-gradient(circle at 100% 0%, rgba(76, 120, 190, 0.1), transparent 24rem),
    var(--surface-raised);
  color: var(--text);
}

:root[data-theme="dark"] .calculator-workbench {
  background: transparent;
  box-shadow: none;
}

:root[data-theme="dark"] .field__control,
:root[data-theme="dark"] .brick-picker__selected,
:root[data-theme="dark"] .brick-depth-choice,
:root[data-theme="dark"] .stone-method-picker,
:root[data-theme="dark"] .wall-masonry-picker,
:root[data-theme="dark"] .natural-stone-control,
:root[data-theme="dark"] .top-gable-table-scroll,
:root[data-theme="dark"] .account-country-control select,
:root[data-theme="dark"] .account-calculation-field input,
:root[data-theme="dark"] .account-custom-value,
:root[data-theme="dark"] .account-notice {
  border-color: var(--line);
  background: var(--field-bg);
  color: var(--text);
}

:root[data-theme="dark"] .stone-method-picker__copy strong,
:root[data-theme="dark"] .brick-picker__selected span,
:root[data-theme="dark"] .brick-picker__selected strong,
:root[data-theme="dark"] .wall-masonry-picker > header strong,
:root[data-theme="dark"] .natural-stone-control__switch,
:root[data-theme="dark"] .account-menu__copy strong,
:root[data-theme="dark"] .account-user__identity h2,
:root[data-theme="dark"] .field__control input,
:root[data-theme="dark"] .field__control select {
  color: var(--text);
}

:root[data-theme="dark"] .stone-method-options,
:root[data-theme="dark"] .wall-masonry-toggle {
  background: rgba(255, 255, 255, 0.08);
}

:root[data-theme="dark"] .stone-method-options button.is-active {
  background: rgba(255, 255, 255, 0.14);
  color: var(--text);
}

:root[data-theme="dark"] .top-gable-table-panel thead th {
  background: #202631;
  color: var(--text-soft);
}

:root[data-theme="dark"] .print-workspace {
  color-scheme: light;
}

@media (prefers-reduced-transparency: reduce) {
  .site-header,
  .mobile-tabs,
  .language-menu__popover,
  .mobile-menu__popover,
  .home-action--glass,
  .home-workbench {
    background: var(--surface-strong);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  body:has(.home-canvas) .site-header,
  body:has(.home-canvas) .mobile-tabs,
  body:has(.home-canvas) .home-action--glass,
  body:has(.home-canvas) .home-workbench {
    background: #151922;
  }
}

@media (prefers-contrast: more) {
  :root {
    --line: color-mix(in srgb, currentcolor 34%, transparent);
    --line-soft: color-mix(in srgb, currentcolor 20%, transparent);
  }

  .site-header,
  .mobile-tabs,
  .button,
  input,
  select,
  textarea {
    border-color: currentcolor;
  }
}

@media print {
  .mobile-tabs,
  .mobile-menu {
    display: none !important;
  }
}