/* ============================================================
   ECO-TRACKER — style.css
   All visual styling lives here.
   Organised into sections:
   1. CSS Variables (colour palette, fonts, sizes)
   2. Base / Reset
   3. Header
   4. Main Layout
   5. Input Card (add item form)
   6. Stats Row
   7. Filter Pills
   8. Inventory Grid & Food Cards
   9. Empty State
   10. Modal
   11. Toast
   12. Scrollbar
   13. Animations
   14. Responsive (mobile overrides)
============================================================ */


/* ─────────────────────────────────────────
   1. CSS VARIABLES
   Define colours, fonts and sizes ONCE here.
   Use them everywhere with var(--name).
───────────────────────────────────────── */
:root {
  /* Green shades */
  --green-50:  #EAF3DE;
  --green-200: #97C459;
  --green-600: #3B6D11;
  --green-800: #27500A;

  /* Amber/yellow shades */
  --amber-50:  #FAEEDA;
  --amber-200: #EF9F27;
  --amber-600: #854F0B;
  --amber-800: #633806;

  /* Red shades */
  --red-50:  #FCEBEB;
  --red-200: #F09595;
  --red-600: #A32D2D;
  --red-800: #791F1F;

  /* Teal shades */
  --teal-50:  #E1F5EE;
  --teal-400: #1D9E75;
  --teal-600: #0F6E56;
  --teal-800: #085041;

  /* Gray shades */
  --gray-50:  #F8F9FA;
  --gray-100: #F1EFE8;
  --gray-200: #D3D1C7;
  --gray-400: #888780;
  --gray-600: #5F5E5A;
  --gray-800: #2C2C2A;

  --white: #ffffff;

  /* Text colours */
  --text-primary:   #1a1a18;
  --text-secondary: #5a5a56;
  --text-muted:     #888780;

  /* Misc */
  --border:     rgba(0, 0, 0, 0.1);
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.12);

  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Fonts */
  --font-display: 'DM Serif Display', serif;
  --font-body:    'DM Sans', sans-serif;
}


/* ─────────────────────────────────────────
   2. BASE / RESET
   Remove browser default margin/padding.
   Set sensible defaults for all elements.
───────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background: var(--gray-50);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}


/* ─────────────────────────────────────────
   3. HEADER
   Sticky bar at top with logo + button.
───────────────────────────────────────── */
header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;           /* Vertically center logo and button */
  justify-content: space-between; /* Logo on left, button on right */
  position: sticky; /* Stays at top when you scroll */
  top: 0;
  z-index: 100;     /* Float above all other content */
  box-shadow: var(--shadow-sm);
}

/* Logo link (wraps icon + text) */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

/* Green square holding the leaf emoji */
.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--teal-400), var(--green-600));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

/* "EcoTracker" text */
.logo-text {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* "Tracker" part is teal */
.logo-text span {
  color: var(--teal-400);
}

/* ✨ Magic Recipe button */
.magic-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: linear-gradient(135deg, #1D9E75 0%, #639922 60%, #3B6D11 100%);
  color: white;
  border: none;
  border-radius: var(--radius-xl);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: opacity 0.2s, transform 0.15s;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(29, 158, 117, 0.3);
}

.magic-btn:hover  { opacity: 0.9; transform: translateY(-1px); }
.magic-btn:active { transform: translateY(0); opacity: 1; }

.magic-btn .btn-icon { font-size: 16px; }


/* ─────────────────────────────────────────
   4. MAIN LAYOUT
   Centers the content, limits max width.
───────────────────────────────────────── */
main {
  max-width: 1100px;
  margin: 0 auto;          /* Center horizontally */
  padding: 2rem 1.5rem 4rem;
}


/* ─────────────────────────────────────────
   5. INPUT CARD (Add Item Form)
───────────────────────────────────────── */
.input-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.input-card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 3-column layout: [name input] [date input] [button] */
.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 12px;
  align-items: end; /* Align button bottom with inputs */
}

/* Stacks label on top of input */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.field-group input {
  padding: 10px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--white);
  transition: border-color 0.2s;
  outline: none;
  width: 100%;
}

/* Blue-green glow on focus */
.field-group input:focus {
  border-color: var(--teal-400);
  box-shadow: 0 0 0 3px rgba(29, 158, 117, 0.1);
}

/* "+ Add Item" button */
.add-btn {
  padding: 10px 24px;
  background: var(--teal-400);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  white-space: nowrap;
  height: 42px;
}

.add-btn:hover  { background: var(--teal-600); transform: translateY(-1px); }
.add-btn:active { transform: translateY(0); }


/* ─────────────────────────────────────────
   6. STATS ROW (Fresh / Expiring / Expired counts)
───────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.8rem;
  line-height: 1;
  color: var(--text-primary);
}

/* Coloured numbers per status */
.stat-card.fresh    .stat-value { color: var(--green-600); }
.stat-card.expiring .stat-value { color: var(--amber-600); }
.stat-card.expired  .stat-value { color: var(--red-600); }


/* ─────────────────────────────────────────
   7. FILTER PILLS
───────────────────────────────────────── */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  align-items: center;
}

.filter-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 4px;
}

/* Base pill style (inactive) */
.pill {
  padding: 6px 16px;
  border-radius: 999px; /* Fully rounded = pill shape */
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid var(--gray-200);
  background: var(--white);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: all 0.18s;
}

.pill:hover { border-color: var(--teal-400); color: var(--teal-600); }

/* Active pill — All */
.pill.active {
  background: var(--teal-400);
  color: white;
  border-color: var(--teal-400);
  box-shadow: 0 2px 8px rgba(29,158,117,0.25);
}

/* Active pill — Fresh */
.pill-fresh.active {
  background: var(--green-600);
  border-color: var(--green-600);
  box-shadow: 0 2px 8px rgba(59,109,17,0.25);
}

/* Active pill — Expiring */
.pill-expiring.active {
  background: var(--amber-600);
  border-color: var(--amber-600);
  box-shadow: 0 2px 8px rgba(133,79,11,0.25);
}

/* Active pill — Expired */
.pill-expired.active {
  background: var(--red-600);
  border-color: var(--red-600);
  box-shadow: 0 2px 8px rgba(163,45,45,0.25);
}


/* ─────────────────────────────────────────
   8. INVENTORY GRID & FOOD CARDS
───────────────────────────────────────── */

/* Grid container — starts as 1 column (mobile) */
.inventory-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* Each individual food card */
.food-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: box-shadow 0.2s, transform 0.2s;
  animation: cardIn 0.3s ease both; /* Fade-in animation on creation */
  border-left: 4px solid transparent; /* Coloured left accent */
}

.food-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px); /* Lift on hover */
}

/* Left border colour by status */
.food-card.fresh    { border-left-color: var(--green-200); }
.food-card.expiring { border-left-color: var(--amber-200); }
.food-card.expired  { border-left-color: var(--red-200);   }

/* Top row: item name + delete button */
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.item-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--text-primary);
  line-height: 1.25;
  flex: 1;
  padding-right: 10px;
}

/* 🗑 Trash icon button */
.delete-btn {
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
  flex-shrink: 0;
}

.delete-btn:hover {
  color: var(--red-600);
  background: var(--red-50);
}

.delete-btn svg { width: 16px; height: 16px; }

/* Freshness Badge (Fresh / Expiring Soon / Expired) */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 11px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

/* Small coloured dot inside badge */
.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.badge.fresh    { background: var(--green-50); color: var(--green-800); }
.badge.fresh    .badge-dot { background: var(--green-600); }

.badge.expiring { background: var(--amber-50); color: var(--amber-800); }
.badge.expiring .badge-dot { background: var(--amber-600); }

.badge.expired  { background: var(--red-50);   color: var(--red-800); }
.badge.expired  .badge-dot { background: var(--red-600); }

/* "X days left" text */
.days-left {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.days-left strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* Date text at bottom of card */
.expiry-date {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
}


/* ─────────────────────────────────────────
   9. EMPTY STATE
   Shown when no items exist or match filter.
───────────────────────────────────────── */
.empty-state {
  grid-column: 1 / -1; /* Span all grid columns */
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  display: block;
}

.empty-state p        { font-size: 1rem; color: var(--text-secondary); }
.empty-state .empty-sub { font-size: 0.85rem; margin-top: 0.5rem; }


/* ─────────────────────────────────────────
   10. MODAL
───────────────────────────────────────── */

/* Dark overlay behind modal */
.modal-backdrop {
  display: none; /* Hidden by default */
  position: fixed;
  inset: 0;      /* Cover full screen (top:0, right:0, bottom:0, left:0) */
  background: rgba(0, 0, 0, 0.45);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  backdrop-filter: blur(2px);
}

/* JS adds class "open" to show the backdrop */
.modal-backdrop.open {
  display: flex;
  animation: fadeIn 0.2s ease both;
}

/* White modal box */
.modal {
  background: var(--white);
  border-radius: var(--radius-xl);
  max-width: 580px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.25s ease both;
}

/* Sticky header inside modal */
.modal-header {
  padding: 1.5rem 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  background: var(--white);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--teal-50), var(--green-50));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  border: 1px solid var(--border);
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--text-primary);
}

/* ✕ Close button */
.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: background 0.2s, color 0.2s;
}

.modal-close:hover { background: var(--gray-100); color: var(--text-primary); }

.modal-body   { padding: 1.5rem; }

/* Info bar showing which ingredients are being used */
.modal-context {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.modal-context .ctx-icon { font-size: 14px; margin-top: 1px; flex-shrink: 0; }

/* Area where the AI recipe text appears */
.recipe-output {
  min-height: 120px;
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.75;
}

/* Loading spinner container */
.recipe-output .loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 2rem 0;
  color: var(--text-secondary);
}

/* Spinning circle */
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--teal-400); /* Only one segment is coloured */
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Recipe title line */
.recipe-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--teal-800);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

/* Each step block */
.recipe-step {
  display: flex;
  gap: 12px;
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--teal-400);
}

.step-num  { font-family: var(--font-display); font-size: 1.1rem; color: var(--teal-600); min-width: 1.5rem; flex-shrink: 0; line-height: 1.5; }
.step-text { font-size: 0.92rem; line-height: 1.65; color: var(--text-primary); }

/* Error box */
.recipe-error {
  background: var(--red-50);
  border: 1px solid rgba(163, 45, 45, 0.15);
  border-radius: var(--radius-sm);
  padding: 1rem;
  color: var(--red-800);
  font-size: 0.9rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* "Close" button (secondary) */
.btn-secondary {
  padding: 8px 18px;
  background: none;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-secondary);
  transition: border-color 0.2s;
}

.btn-secondary:hover { border-color: var(--gray-400); color: var(--text-primary); }

/* "Regenerate" button (primary) */
.btn-primary {
  padding: 8px 20px;
  background: linear-gradient(135deg, #1D9E75, #3B6D11);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
}

.btn-primary:hover    { opacity: 0.9; }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }


/* ─────────────────────────────────────────
   11. TOAST NOTIFICATION
───────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px); /* Hidden below screen */
  background: var(--gray-800);
  color: white;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 300;
  transition: transform 0.3s ease;
  white-space: nowrap;
}

/* JS adds class "show" to slide it into view */
.toast.show {
  transform: translateX(-50%) translateY(0);
}


/* ─────────────────────────────────────────
   12. SCROLLBAR (optional cosmetic)
───────────────────────────────────────── */
::-webkit-scrollbar       { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-200); border-radius: 3px; }


/* ─────────────────────────────────────────
   13. ANIMATIONS
───────────────────────────────────────── */

/* Card slides up and fades in when created */
@keyframes cardIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Modal backdrop fades in */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Modal box slides up */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Loading spinner rotates */
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Recipe text fades in after loading */
@keyframes textFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.recipe-text { animation: textFadeIn 0.4s ease both; }


/* ─────────────────────────────────────────
   14. RESPONSIVE — Mobile Overrides
   These rules only apply when screen is narrow.
───────────────────────────────────────── */

/* Tablet: 2 card columns */
@media (min-width: 640px) {
  .inventory-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop: 3 card columns */
@media (min-width: 960px) {
  .inventory-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Mobile: Stack form inputs vertically */
@media (max-width: 600px) {
  .input-row {
    grid-template-columns: 1fr; /* Single column */
  }
}

/* Mobile: Stack stat cards vertically */
@media (max-width: 480px) {
  .stats-row {
    grid-template-columns: 1fr;
  }
}