/* ==========================================================================
   PizzaScience — Layout
   Responsive layout: sidebar + header + main grid on desktop,
   bottom-nav + stacked content on mobile.
   ========================================================================== */

/* -----------------------------------------------------------------------
   App Shell
   ----------------------------------------------------------------------- */
.app {
  display: flex;
  min-block-size: 100dvh;
}

/* -----------------------------------------------------------------------
   Sidebar (Desktop only)
   ----------------------------------------------------------------------- */
.sidebar {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  inline-size: var(--sidebar-width);
  display: none;
  flex-direction: column;
  background-color: var(--color-surface-sunken);
  border-inline-end: 1px solid var(--color-border);
  box-shadow: none;
  z-index: 50;
  padding-block: var(--space-lg);
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  transition: inline-size 0.22s ease, opacity 0.22s ease, border-inline-end-color 0.22s ease;
}

.sidebar__brand {
  padding-inline: var(--space-md);
  margin-block-end: var(--space-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

.sidebar__logo-img {
  max-inline-size: 56%;
  block-size: auto;
  display: block;
  transition: opacity 0.12s ease, max-inline-size 0.22s ease;
}

.sidebar__toggle-btn {
  display: none;
}

.sidebar__nav-label,
.sidebar__upgrade-label {
  display: inline-block;
  transition: opacity 0.12s ease, max-inline-size 0.22s ease;
  max-inline-size: 150px;
  overflow: hidden;
  white-space: nowrap;
  vertical-align: middle;
}

/* Nav Links */
.sidebar__nav {
  flex: 1;
  padding-inline: var(--space-xs);
}

.sidebar__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.sidebar__nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: var(--fs-body-sm);
  transition: all var(--duration-normal) var(--ease-default);
  text-decoration: none;
}

.sidebar__nav-link:hover {
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--color-text);
}

.sidebar__nav-link--active {
  background-color: rgba(0, 0, 0, 0.06);
  color: var(--color-text);
  font-weight: var(--fw-semibold);
}

.sidebar__nav-link .material-symbols-outlined {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.sidebar__lock-icon {
  margin-inline-start: auto;
  font-size: 0.875rem !important;
  color: var(--color-text-secondary);
  opacity: 0.5;
}

/* Footer */
.sidebar__footer {
  margin-block-start: auto;
  padding-inline: var(--space-xs);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.sidebar__upgrade-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-inline: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-premium-subtle);
  border: 1px solid #e2c170;
  color: #b8922e;
  font-weight: var(--fw-semibold);
  font-size: var(--fs-body-sm);
  border-radius: var(--radius-sm);
  box-shadow: none;
  transition: all var(--duration-normal) var(--ease-default);
}

.sidebar__upgrade-btn:hover {
  background-color: #f5ebd0;
  border-color: var(--color-premium);
  transform: none;
}

.sidebar__secondary-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.sidebar__secondary-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  font-size: var(--fs-body-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-default);
  text-decoration: none;
}

.sidebar__secondary-link:hover {
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--color-text);
}

.sidebar__secondary-link .material-symbols-outlined {
  font-size: 1.25rem;
}

/* -----------------------------------------------------------------------
   Mobile Drawer Overlay (sidebar on mobile)
   ----------------------------------------------------------------------- */
.drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-surface-overlay);
  z-index: 45;
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-default);
}

.drawer-overlay--visible {
  display: block;
  opacity: 1;
}

/* -----------------------------------------------------------------------
   Main Content Area
   ----------------------------------------------------------------------- */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-block-size: 100dvh;
}

/* -----------------------------------------------------------------------
   Top Header Bar
   ----------------------------------------------------------------------- */
.header {
  position: sticky;
  inset-block-start: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  block-size: var(--header-height);
  padding-inline: var(--space-md);
  background-color: var(--color-surface);
  border-block-end: 1px solid var(--color-border);
}

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

.header__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-block-size: 44px;
  min-inline-size: 44px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: background-color var(--duration-fast) var(--ease-default);
}

.header__menu-btn:hover {
  background-color: var(--color-surface-sunken);
}

.header__brand-mobile {
  font-size: var(--fs-h3);
  font-weight: var(--fw-extrabold);
  color: var(--color-text);
  letter-spacing: var(--ls-tight);
}

.header__toggles {
  display: flex;
  gap: var(--space-sm);
}

.header__toggle-btn {
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  padding-block-end: var(--space-2xs);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-default);
  border-block-end: 2px solid transparent;
}

.header__toggle-btn:hover {
  color: var(--color-accent);
}

.header__toggle-btn--active {
  color: var(--color-text);
  font-weight: var(--fw-bold);
  border-block-end-color: var(--color-accent);
}

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

.header__unit-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-secondary);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-default);
}

.header__unit-btn:hover {
  background-color: var(--color-gray-200);
  color: var(--color-text);
}

.header__unit-btn--active {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
}

.header__icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-block-size: 40px;
  min-inline-size: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--duration-fast) var(--ease-default);
}

.header__icon-btn:hover {
  background-color: var(--color-surface-sunken);
  color: var(--color-accent);
}

/* -----------------------------------------------------------------------
   Calculator Grid (Main Content)
   ----------------------------------------------------------------------- */
.calculator {
  flex: 1;
  padding: var(--space-md);
  overflow-y: auto;
}

.calculator__grid {
  max-inline-size: var(--container-max);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--content-gap);
}

.calculator__inputs {
  order: 2;
}

.calculator__outputs {
  order: 1;
}

.calculator__section-title {
  font-size: var(--fs-h1);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  margin-block-end: var(--space-lg);
}

/* -----------------------------------------------------------------------
   Bottom Navigation (Mobile only)
   ----------------------------------------------------------------------- */
.bottom-nav {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: 40;
  display: flex;
  align-items: stretch;
  block-size: var(--bottom-nav-height);
  background-color: var(--color-surface);
  border-block-start: 1px solid var(--color-border);
  box-shadow: 0 -2px 8px rgb(0 0 0 / 0.06);
  padding-block-end: env(safe-area-inset-bottom, 0);
}

.bottom-nav__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xs);
  font-size: 0.625rem;
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  color: var(--color-text-tertiary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
  position: relative;
}

.bottom-nav__item:hover {
  color: var(--color-accent);
}

.bottom-nav__item--active {
  color: var(--color-text);
}

.bottom-nav__item--active::before {
  content: '';
  position: absolute;
  inset-block-start: 0;
  inline-size: 2rem;
  block-size: 3px;
  background-color: var(--color-accent);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.bottom-nav__item .material-symbols-outlined {
  font-size: 1.375rem;
}

/* -----------------------------------------------------------------------
   Desktop Breakpoint (≥768px)
   ----------------------------------------------------------------------- */
@media (min-width: 768px) {
  .sidebar {
    display: flex;
  }

  .sidebar__brand {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .sidebar__logo-img {
    align-self: center;
  }

  .sidebar__toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: var(--space-2xs);
    border-radius: var(--radius-sm);
    transition: background-color var(--duration-fast), color var(--duration-fast);
    align-self: flex-end;
  }

  .sidebar__toggle-btn:hover {
    background-color: rgba(0, 0, 0, 0.04);
    color: var(--color-text);
  }

  .main-wrapper {
    margin-inline-start: var(--sidebar-width);
    transition: margin-inline-start 0.22s ease;
  }

  .header__menu-btn,
  .header__brand-mobile {
    display: none;
  }

  /* Collapsed states */
  .app--sidebar-collapsed .sidebar {
    inline-size: 48px;
  }

  .app--sidebar-collapsed .sidebar__logo-img {
    opacity: 0;
    max-inline-size: 0;
    pointer-events: none;
  }

  .app--sidebar-collapsed .sidebar__brand {
    justify-content: center;
    align-items: center;
    padding-inline: 0;
  }

  .app--sidebar-collapsed .sidebar__toggle-btn {
    align-self: center;
  }

  .app--sidebar-collapsed .sidebar__nav-label,
  .app--sidebar-collapsed .sidebar__upgrade-label {
    opacity: 0;
    max-inline-size: 0;
    pointer-events: none;
  }

  .app--sidebar-collapsed .sidebar__lock-icon {
    display: none !important;
  }

  .app--sidebar-collapsed .sidebar__nav-link {
    justify-content: center;
    padding-inline: 0;
    gap: 0;
  }

  .app--sidebar-collapsed .sidebar__secondary-link {
    justify-content: center;
    padding-inline: 0;
    gap: 0;
  }

  .app--sidebar-collapsed .sidebar__upgrade-btn {
    margin-inline: 0;
    padding-inline: 0;
    border-color: transparent;
    background: transparent;
    justify-content: center;
  }

  .app--sidebar-collapsed .main-wrapper {
    margin-inline-start: 48px;
  }

  .app--sidebar-collapsed .header__brand-mobile {
    display: block;
  }

  .header__toggles {
    gap: var(--space-lg);
  }

  .header {
    display: none;
  }

  .calculator {
    padding: var(--space-xl);
  }

  .bottom-nav {
    display: none;
  }

  /* Add bottom padding space that the bottom nav would have occupied */
  .calculator {
    padding-block-end: var(--space-xl);
  }
}

/* -----------------------------------------------------------------------
   Large Desktop (≥1024px) — two-column calculator
   ----------------------------------------------------------------------- */
@media (min-width: 1024px) {
  .calculator__grid {
    grid-template-columns: 7fr 5fr;
  }
  .calculator__inputs {
    order: 1;
  }
  .calculator__outputs {
    order: 2;
  }
}

/* -----------------------------------------------------------------------
   Mobile — account for bottom nav
   ----------------------------------------------------------------------- */
@media (max-width: 767px) {
  .calculator {
    padding-block-end: calc(var(--bottom-nav-height) + var(--space-lg) + env(safe-area-inset-bottom, 0));
  }

  /* Mobile drawer sidebar behavior */
  .sidebar--mobile-open {
    display: flex;
    animation: slideInFromLeft var(--duration-slow) var(--ease-out);
  }
}

@keyframes slideInFromLeft {
  from { transform: translateX(-100%); }
  to   { transform: translateX(0); }
}