/* =========================================
   LAYOUT — Recipe to Grocery List v2.0
   ========================================= */

/* ══════════════════════════════════════════
   APP SHELL
   ══════════════════════════════════════════ */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* ══════════════════════════════════════════
   HEADER
   ══════════════════════════════════════════ */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: var(--space-5);
  padding-block: var(--space-3);
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-block-end: 1px solid var(--color-border);
  box-shadow: 0 1px 0 var(--color-border), var(--shadow-sm);
  min-height: 60px;
  transition: background var(--transition-base), border-color var(--transition-base);
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2-5);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: var(--weight-extrabold);
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: var(--tracking-tight);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.app-header__brand:hover {
  color: var(--color-text-brand);
  transform: translateX(1px);
}

.app-header__logo {
  font-size: 1.5rem;
  line-height: 1;
  filter: drop-shadow(0 2px 4px rgb(16 185 129 / 0.3));
}

/* Brand text with gradient */
.app-header__brand span:not(.app-header__logo) {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Theme toggle button */
#theme-toggle {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-spring);
}

#theme-toggle:hover {
  background: var(--color-brand-subtle);
  border-color: var(--color-brand);
  transform: scale(1.1) rotate(8deg);
}

/* ══════════════════════════════════════════
   BOTTOM NAVIGATION (Mobile)
   ══════════════════════════════════════════ */
.app-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: var(--color-surface-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-block-start: 1px solid var(--color-border);
  box-shadow: 0 -4px 24px rgb(0 0 0 / 0.06), 0 -1px 0 var(--color-border);
  padding-block-end: env(safe-area-inset-bottom, 0);
  transition: background var(--transition-base);
}

.app-nav__list {
  display: flex;
  justify-content: space-around;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
}

.app-nav__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-0-5);
  padding: var(--space-2-5) var(--space-4);
  min-width: 64px;
  min-height: 56px;
  color: var(--color-text-muted);
  font-size: 0.65rem;
  font-weight: var(--weight-semibold);
  text-decoration: none;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: var(--radius-lg);
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  position: relative;
  transition:
    color      var(--transition-fast),
    background var(--transition-fast),
    transform  var(--transition-spring);
}

.app-nav__link::before {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 28px;
  height: 3px;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transition: transform var(--transition-spring);
}

.app-nav__link--active::before {
  transform: translateX(-50%) scaleX(1);
}

.app-nav__link:hover { color: var(--color-text-secondary); }

.app-nav__link--active {
  color: var(--color-brand);
}

.app-nav__icon {
  font-size: 1.3rem;
  line-height: 1;
  transition: transform var(--transition-spring);
}

.app-nav__link--active .app-nav__icon {
  transform: scale(1.1) translateY(-1px);
}

.app-nav__link:hover .app-nav__icon {
  transform: scale(1.05);
}

.app-nav__label { line-height: 1; }

/* ══════════════════════════════════════════
   MAIN CONTENT
   ══════════════════════════════════════════ */
.app-main {
  flex: 1;
  padding-block-end: calc(72px + env(safe-area-inset-bottom, 0));
  padding-inline: var(--space-4);
  padding-block-start: var(--space-5);
  max-width: 1200px;
  width: 100%;
  margin-inline: auto;
}

/* ══════════════════════════════════════════
   PAGE HEADER
   ══════════════════════════════════════════ */
.page-header {
  margin-block-end: var(--space-6);
}

.page-header__title {
  font-size: clamp(var(--text-xl), 5vw, var(--text-2xl));
  font-weight: var(--weight-extrabold);
  letter-spacing: var(--tracking-tight);
  margin-block-end: var(--space-1);
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.page-header__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
  font-weight: var(--weight-medium);
}

/* ══════════════════════════════════════════
   SEARCH BAR
   ══════════════════════════════════════════ */
.search-bar {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-block-end: var(--space-5);
}

.search-bar__input-wrap {
  position: relative;
  flex: 1;
}

.search-bar__icon {
  position: absolute;
  left: var(--space-3-5);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: var(--icon-sm);
  pointer-events: none;
}

.search-bar__input {
  padding-inline-start: calc(var(--space-3-5) + var(--icon-sm) + var(--space-2));
}

.search-bar__filter-wrap { min-width: 145px; }
.search-bar__filter { width: 100%; }

/* ══════════════════════════════════════════
   ACTION BAR
   ══════════════════════════════════════════ */
.action-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--gradient-brand-soft);
  border: 1px solid var(--color-border-brand);
  border-radius: var(--radius-xl);
  margin-block-end: var(--space-5);
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.action-bar__count {
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-text-brand);
  background: var(--color-surface);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-brand);
}

/* ══════════════════════════════════════════
   RECIPE GRID
   ══════════════════════════════════════════ */
.recipe-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

/* ══════════════════════════════════════════
   SECTION
   ══════════════════════════════════════════ */
.section {
  padding-block: var(--space-8);
}

.section__title {
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  margin-block-end: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
}

.section__title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ══════════════════════════════════════════
   FORM LAYOUT
   ══════════════════════════════════════════ */
.recipe-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  max-width: 640px;
  padding-bottom: var(--space-8);
}

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

.form-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xs);
}

.form-section__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-text);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-block-end: var(--space-3);
  border-block-end: 1px solid var(--color-border);
  margin-block-end: var(--space-1);
}

.recipe-form__submit {
  align-self: flex-start;
  margin-block-start: var(--space-2);
}

/* ══════════════════════════════════════════
   INGREDIENT & STEP ROWS
   ══════════════════════════════════════════ */
.ingredient-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr auto;
  gap: var(--space-2);
  align-items: start;
  padding: var(--space-3);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.ingredient-row:hover {
  background: var(--color-surface);
  border-color: var(--color-border-strong);
}

.ingredient-row__name     { grid-column: span 5; }
.ingredient-row__qty,
.ingredient-row__unit,
.ingredient-row__category { min-width: 0; }

.ingredient-row__delete {
  padding: var(--space-2);
  min-width: var(--size-touch-min);
  align-self: center;
}

.step-row {
  display: flex;
  align-items: center;
  gap: var(--space-2-5);
  padding: var(--space-2-5) var(--space-3);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast);
}

.step-row:hover {
  background: var(--color-surface);
  border-color: var(--color-border-strong);
}

.step-row__number {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: var(--radius-full);
  background: var(--gradient-brand);
  color: white;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-row__input  { flex: 1; }
.step-row__delete { flex-shrink: 0; }

/* ══════════════════════════════════════════
   GROCERY LIST
   ══════════════════════════════════════════ */
.grocery-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.grocery-category {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.grocery-category:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.grocery-category__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--gradient-brand-soft);
  border-block-end: 1px solid var(--color-border);
}

.grocery-category__emoji {
  font-size: 1.3rem;
  line-height: 1;
}

.grocery-category__title {
  flex: 1;
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.grocery-category__list {
  display: flex;
  flex-direction: column;
}

/* ── Grocery Item ── */
.grocery-item {
  display: flex;
  flex-direction: column;
  padding-inline: var(--space-5);
  padding-block: var(--space-1);
  border-block-end: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.grocery-item:last-child { border-block-end: none; }

.grocery-item:hover { background: var(--color-bg-subtle); }

.grocery-item[data-checked="true"] {
  background: var(--color-bg-subtle);
  opacity: 0.65;
}

.grocery-item__name {
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
}

.grocery-item__qty {
  color: var(--color-text-secondary);
  font-variant-numeric: tabular-nums;
  font-weight: var(--weight-medium);
  font-size: var(--text-sm);
}

.grocery-item__source {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-block-start: var(--space-0-5);
  padding-inline-start: calc(1.2rem + var(--space-3));
}

/* ── Grocery Progress ── */
.grocery-progress { margin-block-start: var(--space-3); }

.grocery-progress__text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-block-end: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: var(--weight-medium);
}

/* ══════════════════════════════════════════
   MODAL
   ══════════════════════════════════════════ */
.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  border: none;
  background: transparent;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
}

.modal::backdrop {
  background: rgb(10 15 30 / 0.6);
  backdrop-filter: blur(4px);
  animation: fade-in var(--duration-normal) ease;
}

.modal__backdrop { display: none; }

.modal__container {
  width: 100%;
  max-height: 92dvh;
  background: var(--color-surface);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: slide-up var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-2xl), 0 0 0 1px var(--color-border);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-block-end: 1px solid var(--color-border);
  background: var(--gradient-brand-soft);
}

.modal__title {
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  margin: 0;
  letter-spacing: var(--tracking-tight);
}

.modal__close-btn {
  font-size: var(--text-md);
  width: var(--size-touch-min);
  height: var(--size-touch-min);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-spring);
}

.modal__close-btn:hover {
  background: var(--color-bg-overlay);
  color: var(--color-text);
  transform: scale(1.1) rotate(8deg);
}

.modal__body {
  flex: 1;
  padding: var(--space-6);
  overflow-y: auto;
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  border-block-start: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
}

/* Modal closing */
.modal--closing .modal__container {
  animation: slide-down var(--duration-fast) var(--ease-in) forwards;
}

@keyframes slide-down {
  to { transform: translateY(100%); opacity: 0; }
}

/* ══════════════════════════════════════════
   TOAST
   ══════════════════════════════════════════ */
.toast-container {
  position: fixed;
  bottom: calc(var(--space-5) + 72px + env(safe-area-inset-bottom, 0));
  right: var(--space-4);
  left: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3-5) var(--space-4);
  background: var(--neutral-900);
  color: #ffffff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl), 0 0 0 1px rgb(255 255 255 / 0.06);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  pointer-events: auto;
  opacity: 0;
  transform: translateY(10px) scale(0.96);
  transition: all var(--transition-base);
  border: 1px solid rgb(255 255 255 / 0.08);
}

[data-theme="dark"] .toast {
  background: #1a2540;
  border-color: var(--color-border-strong);
}

.toast--visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.toast--dismissing {
  opacity: 0;
  transform: translateX(110%) scale(0.92);
}

/* Toast variants */
.toast--success { border-left: 3px solid var(--success-icon); }
.toast--error   { border-left: 3px solid var(--error-icon); }
.toast--warning { border-left: 3px solid var(--warning-icon); }
.toast--info    { border-left: 3px solid var(--info-icon); }

.toast__icon { flex-shrink: 0; font-size: var(--icon-md); }
.toast__message { flex: 1; }

.toast__close {
  flex-shrink: 0;
  color: rgb(255 255 255 / 0.5);
  font-size: var(--text-base);
  width: var(--icon-md);
  height: var(--icon-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.toast__close:hover { color: #ffffff; transform: scale(1.2); }

/* ══════════════════════════════════════════
   EMPTY STATE
   ══════════════════════════════════════════ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-16) var(--space-4);
  gap: var(--space-4);
}

/* ══════════════════════════════════════════
   RESPONSIVE — Tablet (640px+)
   ══════════════════════════════════════════ */
@media (min-width: 640px) {
  .app-main {
    padding-inline: var(--space-6);
    padding-block-start: var(--space-6);
    padding-block-end: var(--space-8);
  }

  .app-nav {
    position: static;
    box-shadow: none;
    border-block-start: none;
    border-block-end: 1px solid var(--color-border);
    padding-block-end: 0;
    background: var(--color-surface-glass);
    backdrop-filter: blur(16px);
  }

  .app-nav__list {
    justify-content: flex-start;
    gap: var(--space-1);
    padding-inline: var(--space-5);
  }

  .app-nav__link {
    flex-direction: row;
    font-size: var(--text-xs);
    padding: var(--space-2-5) var(--space-4);
    gap: var(--space-2);
    min-height: 44px;
    min-width: auto;
  }

  .app-nav__link::before {
    top: auto;
    bottom: 0;
    left: 50%;
    width: 100%;
    height: 2px;
    border-radius: var(--radius-full) var(--radius-full) 0 0;
  }

  .app-nav__link--active .app-nav__icon {
    transform: none;
  }

  .recipe-grid { grid-template-columns: repeat(2, 1fr); }

  .search-bar {
    flex-direction: row;
    align-items: end;
  }

  .search-bar__filter-wrap { min-width: 165px; }

  .form-row { grid-template-columns: 1fr 1fr; }

  .ingredient-row { grid-template-columns: 3fr 1fr 1fr 1fr auto; }
  .ingredient-row__name { grid-column: span 1; }

  .modal {
    align-items: center;
    padding: var(--space-6);
  }

  .modal__container {
    max-width: 560px;
    max-height: 88dvh;
    border-radius: var(--radius-2xl);
  }

  .toast-container {
    bottom: var(--space-6);
    left: auto;
    right: var(--space-6);
    max-width: 380px;
  }
}

/* ══════════════════════════════════════════
   RESPONSIVE — Desktop (1024px+)
   ══════════════════════════════════════════ */
@media (min-width: 1024px) {
  .app {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .app-header { flex: 0 0 100%; }

  .app-nav {
    flex: 0 0 220px;
    position: sticky;
    top: 60px;
    height: calc(100dvh - 60px);
    border-block-end: none;
    border-inline-end: 1px solid var(--color-border);
    overflow-y: auto;
    padding-block: var(--space-4);
  }

  .app-nav__list {
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-4);
    align-items: stretch;
  }

  .app-nav__link {
    flex-direction: row;
    font-size: var(--text-sm);
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
    width: 100%;
    text-align: left;
    border-radius: var(--radius-lg);
    text-transform: none;
    letter-spacing: normal;
    min-height: 44px;
  }

  .app-nav__link::before {
    top: 50%;
    left: 0;
    bottom: auto;
    width: 3px;
    height: 60%;
    transform: translate(0, -50%) scaleY(0);
    border-radius: 0 var(--radius-full) var(--radius-full) 0;
  }

  .app-nav__link--active::before {
    transform: translate(0, -50%) scaleY(1);
  }

  .app-nav__link--active {
    background: var(--color-brand-subtle);
    color: var(--color-brand);
  }

  .app-nav__link:hover:not(.app-nav__link--active) {
    background: var(--color-bg-subtle);
  }

  .app-nav__icon { font-size: 1.1rem; }

  .app-main {
    flex: 1;
    padding-block-end: var(--space-8);
    padding-inline: var(--space-8);
  }

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

/* ══════════════════════════════════════════
   RESPONSIVE — Large Desktop (1280px+)
   ══════════════════════════════════════════ */
@media (min-width: 1280px) {
  .app-main { max-width: none; }
}