/* F:\Antigravity\Chipotle-Nutrition-Calculator\assets\css\styles.css */

/* ==========================================================================
   CSS Variables & Theming
   ========================================================================== */
:root {
  /* Colors */
  --color-primary: #8C1515; /* Chipotle-inspired red, but slightly deeper for premium feel */
  --color-primary-hover: #A01D1D;
  --color-primary-light: #FCE8E8;
  
  --color-text-main: #111827;
  --color-text-muted: #4B5563;
  --color-text-faint: #9CA3AF;
  
  --color-bg-main: #FFFFFF;
  --color-bg-offset: #F9FAFB;
  --color-bg-card: #FFFFFF;
  
  --color-border: #E5E7EB;
  --color-border-hover: #D1D5DB;

  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout */
  --container-max-width: 1200px;
  --sidebar-width: 340px;
  --header-height: 72px;

  /* Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-float: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text-main: #F9FAFB;
    --color-text-muted: #9CA3AF;
    --color-text-faint: #6B7280;
    
    --color-bg-main: #0F172A;
    --color-bg-offset: #1E293B;
    --color-bg-card: #1E293B;
    
    --color-border: #334155;
    --color-border-hover: #475569;
    
    --color-primary-light: rgba(140, 21, 21, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-float: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  }
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-main);
  color: var(--color-text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img, picture, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
  border: none;
  background: none;
}

button {
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: var(--space-4);
  letter-spacing: -0.025em;
}

main {
  flex-grow: 1;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 1.75rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.font-medium { font-weight: 500; }
.font-bold { font-weight: 700; }

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-sm {
  max-width: 800px;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-8 { gap: var(--space-8); }
.gap-12 { gap: var(--space-12); }

.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid-cols-2, .grid-cols-3, .grid-cols-4 {
    grid-template-columns: 1fr;
  }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(var(--color-bg-main-rgb), 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}
/* Workaround to inject rgb base for backdrop fallback if needed */
:root { --color-bg-main-rgb: 255, 255, 255; }
@media (prefers-color-scheme: dark) { :root { --color-bg-main-rgb: 15, 23, 42; } }
.site-header { background-color: rgba(var(--color-bg-main-rgb), 0.8); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); }

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo span {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}

.nav-link {
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-text-main);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-main);
  padding: var(--space-2);
  cursor: pointer;
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--color-bg-main);
    flex-direction: column;
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-menu-btn {
    display: block;
  }
}

/* ==========================================================================
   Buttons & Forms
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-align: center;
  gap: var(--space-2);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  border: 1px solid transparent;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: var(--color-bg-main);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-bg-offset);
  border-color: var(--color-border-hover);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1.125rem;
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-2);
  color: var(--color-text-main);
}

.form-input {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-main);
  color: var(--color-text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

textarea.form-input {
  min-height: 120px;
  resize: vertical;
}

/* ==========================================================================
   Calculator Specific Styles
   ========================================================================== */
.calculator-layout {
  display: flex;
  gap: var(--space-8);
  position: relative;
  align-items: flex-start;
  padding-bottom: var(--space-16);
}

.calculator-main {
  flex: 1;
  min-width: 0;
}

.calculator-sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
}

@media (max-width: 1024px) {
  .calculator-layout {
    flex-direction: column;
  }
  .calculator-sidebar {
    width: 100%;
    position: fixed;
    bottom: 0;
    top: auto;
    left: 0;
    z-index: 40;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    box-shadow: 0 -4px 15px rgba(0,0,0,0.1);
  }
  .nutrition-panel {
    max-height: 60vh;
    overflow-y: auto;
  }
}

.category-section {
  margin-bottom: var(--space-8);
}

.category-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.ingredient-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
}

.ingredient-card {
  background-color: var(--color-bg-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.ingredient-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.ingredient-card.selected {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.ingredient-card.selected::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 40px 40px 0;
  border-color: transparent var(--color-primary) transparent transparent;
}

.ingredient-name {
  font-weight: 600;
  margin-bottom: var(--space-1);
  font-size: 1rem;
}

.ingredient-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  margin-top: auto;
}

.quantity-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-3);
  background-color: var(--color-bg-offset);
  border-radius: var(--radius-full);
  padding: 0.25rem;
}

.quantity-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-main);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
}

.quantity-btn:hover {
  background-color: var(--color-border);
}

.quantity-display {
  font-weight: 600;
  font-size: 0.875rem;
}

/* Nutrition Sidebar Panel */
.nutrition-panel {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
}

.nutrition-panel-header {
  border-bottom: 2px solid var(--color-text-main);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-4);
}

.nutrition-fact-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
}

.nutrition-fact-row.important {
  font-weight: 700;
}

.nutrition-fact-row.indent {
  padding-left: var(--space-4);
  font-size: 0.875rem;
}

.macro-bars {
  margin-top: var(--space-6);
}

.macro-bar-container {
  margin-bottom: var(--space-3);
}

.macro-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  margin-bottom: var(--space-1);
}

.macro-bar-bg {
  height: 8px;
  background-color: var(--color-bg-offset);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.macro-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.macro-fill-protein { background-color: #3B82F6; }
.macro-fill-carbs { background-color: #10B981; }
.macro-fill-fat { background-color: #F59E0B; }

/* ==========================================================================
   Ads & Placeholders
   ========================================================================== */
.ad-placeholder {
  background-color: var(--color-bg-offset);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin: var(--space-8) 0;
  min-height: 90px;
}

.ad-placeholder.sidebar-ad {
  min-height: 250px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-bg-offset);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0 var(--space-6);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-header {
  font-weight: 600;
  margin-bottom: var(--space-4);
  font-size: 1.125rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   Utility Classes & SEO Content
   ========================================================================== */
.section-padding {
  padding: var(--space-16) 0;
}

.prose {
  max-width: 800px;
  margin: 0 auto;
}

.prose p {
  margin-bottom: var(--space-4);
}

.prose h2, .prose h3 {
  margin-top: var(--space-8);
}

.prose ul, .prose ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.prose li {
  margin-bottom: var(--space-2);
}

.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

/* Comments Section */
.comments-section {
  max-width: 800px;
  margin: var(--space-12) auto;
}

.comment-list {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.single-comment {
  background-color: var(--color-bg-offset);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.comment-author {
  font-weight: 600;
}

.comment-date {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}

.comment-body {
  margin-top: var(--space-2);
  color: var(--color-text-main);
}