:root {
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --accent-color: #6b73ff;
  --text-dark: #2d3748;
  --text-light: #718096;
  --white: #ffffff;
  --gray-50: #f7fafc;
  --gray-100: #edf2f7;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e0;
  --gray-800: #2d3748;
  --gray-900: #1a202c;
  --success: #48bb78;
  --warning: #ed8936;
  --error: #f56565;
  
  /* Responsive units */
  --border-radius: 0.75rem;
  --border-radius-sm: 0.5rem;
  --border-radius-lg: 1rem;
  --shadow: 0 0.25rem 1rem rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 0.5rem 2rem rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 1rem 3rem rgba(0, 0, 0, 0.2);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Spacing scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Font sizes - mobile first */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Container widths */
  --container-sm: 100%;
  --container-md: 48rem;
  --container-lg: 64rem;
  --container-xl: 80rem;
  --container-2xl: 96rem;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 100%; /* 16px base - allows user scaling */
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
  background-size: 400% 400%;
  background-attachment: fixed;
  min-height: 100vh;
  color: var(--text-dark);
  line-height: 1.6;
  animation: gradientFlow 12s ease infinite;
  position: relative;
  overflow-x: hidden;
  font-size: var(--text-base);
}

@keyframes gradientFlow {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* Animated Background Particles - Responsive */
.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.particle {
  position: absolute;
  width: 0.25rem;
  height: 0.25rem;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: float 8s infinite linear;
}

.particle:nth-child(1) { top: 10%; left: 10%; animation-delay: 0s; }
.particle:nth-child(2) { top: 20%; left: 80%; animation-delay: 1s; }
.particle:nth-child(3) { top: 60%; left: 20%; animation-delay: 2s; }
.particle:nth-child(4) { top: 80%; left: 90%; animation-delay: 3s; }
.particle:nth-child(5) { top: 30%; left: 50%; animation-delay: 4s; }
.particle:nth-child(6) { top: 70%; left: 70%; animation-delay: 5s; }
.particle:nth-child(7) { top: 40%; left: 30%; animation-delay: 6s; }
.particle:nth-child(8) { top: 90%; left: 60%; animation-delay: 7s; }
.particle:nth-child(9) { top: 50%; left: 10%; animation-delay: 8s; }
.particle:nth-child(10) { top: 15%; left: 40%; animation-delay: 9s; }

@keyframes float {
  0%, 100% {
    transform: translateY(0) translateX(0) rotate(0deg);
    opacity: 0.3;
  }
  50% {
    transform: translateY(-1.25rem) translateX(0.625rem) rotate(180deg);
    opacity: 0.8;
  }
}

/* Container and Layout - Responsive */
.container {
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
  position: relative;
  z-index: 1;
  width: 100%;
}

/* Header Section - Responsive */
.header-section {
  text-align: center;
  margin-bottom: var(--space-2xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-md) 0;
}

.main-logo {
  width: clamp(5rem, 15vw, 7.5rem);
  height: clamp(5rem, 15vw, 7.5rem);
  border-radius: 20%;
  transition: var(--transition);
  object-fit: cover;

}

.main-logo:hover {
  transform: scale(1.1) rotate(10deg);
}

.header-section h1 {
  font-size: clamp(var(--text-3xl), 8vw, var(--text-5xl));
  font-weight: 800;
  color: var(--white);
  text-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.3);
  margin: 0;
  letter-spacing: -0.05em;
  background: linear-gradient(45deg, #fff, #f0f0f0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.subtitle {
  font-size: clamp(var(--text-lg), 4vw, var(--text-xl));
  color: rgba(255, 255, 255, 0.9);
  font-weight: 400;
  text-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.2);
  margin: 0;
  max-width: 90%;
}

/* Search Section - Responsive */
.input-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: var(--container-md);
  margin: 0 auto var(--space-2xl);
  background: rgba(255, 255, 255, 0.1);
  padding: var(--space-md);
  border-radius: var(--border-radius);
  -webkit-backdrop-filter: blur(0.625rem);
  backdrop-filter: blur(0.625rem);
  border: 0.0625rem solid rgba(255, 255, 255, 0.2);
}

#ingredients {
  flex: 1;
  padding: var(--space-lg) var(--space-lg);
  border: none;
  border-radius: var(--border-radius-sm);
  font-size: var(--text-base);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-dark);
  outline: none;
  transition: var(--transition);
  min-height: 3rem;
  width: 100%;
}

#ingredients:focus {
  background: var(--white);
  box-shadow: 0 0 0 0.1875rem rgba(103, 126, 234, 0.3);
}

#ingredients::placeholder {
  color: var(--text-light);
  font-size: var(--text-sm);
}

#search-btn {
  padding: var(--space-lg) var(--space-xl);
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  color: var(--white);
  border: none;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  font-size: var(--text-base);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  min-height: 3rem;
  width: 100%;
}

#search-btn:hover {
  transform: translateY(-0.125rem);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(45deg, var(--accent-color), var(--primary-color));
}

#search-btn:active {
  transform: translateY(0);
}

/* Results Section - Responsive */
.results-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.results-header h2 {
  color: var(--white);
  font-size: clamp(var(--text-xl), 5vw, var(--text-2xl));
  font-weight: 700;
  text-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
}

.recipe-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(20rem, 100%), 1fr));
  gap: clamp(var(--space-md), 4vw, var(--space-xl));
  margin-bottom: var(--space-2xl);
  padding: 0 var(--space-sm);
}

/* Recipe Cards - Responsive */
.recipe-card {
  background: var(--white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  width: 100%;
  max-width: 100%;
}

.recipe-card:hover {
  transform: translateY(-0.5rem);
  box-shadow: var(--shadow-lg);
}

.card-image {
  position: relative;
  height: clamp(12rem, 25vw, 15rem);
  overflow: hidden;
  width: 100%;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.recipe-card:hover .card-image img {
  transform: scale(1.05);
}

.card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.recipe-card:hover .card-overlay {
  opacity: 1;
}

.view-recipe-btn {
  padding: var(--space-md) var(--space-lg);
  background: var(--white);
  color: var(--primary-color);
  border: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-size: var(--text-sm);
  min-height: 2.5rem;
}

.view-recipe-btn:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: scale(1.05);
}

.card-content {
  padding: var(--space-lg);
}

.recipe-title {
  font-size: clamp(var(--text-lg), 3.5vw, var(--text-xl));
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: var(--space-md);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.recipe-meta {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-light);
  font-size: var(--text-sm);
}

.icon {
  font-size: var(--text-base);
}

.cuisine-tags {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.cuisine-tag {
  padding: var(--space-xs) var(--space-md);
  background: var(--gray-100);
  color: var(--text-dark);
  border-radius: 1.25rem;
  font-size: var(--text-xs);
  font-weight: 500;
}

/* Message Containers */
.message-container,
.loading-container {
  text-align: center;
  padding: 3rem 2rem;
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--border-radius);
  margin: 2rem 0;
  box-shadow: var(--shadow);
}

.welcome-message h2 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: 2rem;
}

.welcome-message p {
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.no-results h3,
.error-message h3 {
  color: var(--error);
  margin-bottom: 1rem;
}

.no-results ul {
  text-align: left;
  max-width: 400px;
  margin: 0 auto;
}

.no-results li {
  margin-bottom: 0.5rem;
}

/* Loading Spinner */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-200);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-text {
  color: var(--text-light);
  font-size: 1.1rem;
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  -webkit-backdrop-filter: blur(0.25rem);
  backdrop-filter: blur(0.25rem);
}

.modal-content {
  position: relative;
  background-color: var(--white);
  margin: 2% auto;
  width: 90%;
  max-width: 800px;
  max-height: 90vh;
  border-radius: var(--border-radius);
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  color: var(--text-light);
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
  z-index: 1001;
  background: rgba(255, 255, 255, 0.9);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.close:hover {
  background: var(--error);
  color: var(--white);
}

.recipe-detail-content {
  padding: 2rem;
}

.recipe-header {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.recipe-detail-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--border-radius);
}

.recipe-info h2 {
  font-size: 2rem;
  color: var(--text-dark);
  margin-bottom: 1rem;
  line-height: 1.3;
}

.recipe-stats {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.stat {
  padding: 0.5rem 1rem;
  background: var(--gray-100);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  color: var(--text-dark);
}

.recipe-cuisines {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.cuisine-badge {
  padding: 0.5rem 1rem;
  background: var(--primary-color);
  color: var(--white);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.recipe-sections {
  display: grid;
  gap: 2rem;
}

.ingredients-section h3,
.instructions-section h3 {
  color: var(--text-dark);
  font-size: 1.5rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ingredients-list {
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.ingredients-list li {
  padding: 0.75rem;
  background: var(--gray-50);
  border-radius: var(--border-radius);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ingredient-amount {
  font-weight: 600;
  color: var(--primary-color);
  min-width: 80px;
}

.ingredient-name {
  flex: 1;
  margin-left: 1rem;
}

.instructions-content {
  background: var(--gray-50);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  line-height: 1.8;
}

.recipe-source {
  text-align: center;
  margin-top: 2rem;
}

.source-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  background: var(--primary-color);
  color: var(--white);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: var(--transition);
}

.source-link:hover {
  background: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* Footer Styles */
.recipe-footer {
  background: rgba(0, 0, 0, 0.1);
  -webkit-backdrop-filter: blur(0.625rem);
  backdrop-filter: blur(0.625rem);
  color: var(--white);
  padding: 3rem 0 1rem;
  margin-top: 4rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.footer-brand h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  transition: var(--transition);
}

.site-logo:hover {
  transform: scale(1.1);
}

.brand-tagline {
  margin-bottom: 1.5rem;
  opacity: 0.9;
  line-height: 1.6;
}

.footer-stats {
  display: flex;
  gap: 1rem;
}

.stat-item {
  text-align: center;
}

.stat-item strong {
  display: block;
  font-size: 1.2rem;
  color: var(--accent-color);
}

.footer-section h3 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  color: var(--white);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: var(--transition);
}

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

.popular-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.9rem;
}

.tag:hover {
  background: var(--accent-color);
  transform: translateY(-2px);
}

.social-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.social-btn {
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.social-btn:hover {
  background: var(--accent-color);
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 2rem;
  padding-top: 2rem;
  text-align: center;
}

.footer-bottom-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.copyright {
  margin-bottom: 0.5rem;
  opacity: 0.8;
}

.heart {
  color: var(--error);
  animation: heartbeat 2s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.attribution {
  opacity: 0.7;
  font-size: 0.9rem;
}

/* ===================================================================
   RESPONSIVE DESIGN - Mobile First Approach
   =================================================================== */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 36em) {
  .input-section {
    flex-direction: row;
    gap: var(--space-md);
  }
  
  #search-btn {
    width: auto;
    min-width: 8rem;
  }
  
  .recipe-grid {
    grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  }
  
  .container {
    padding: var(--space-xl) var(--space-lg);
  }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 48em) {
  :root {
    --text-base: 1.125rem;
    --text-lg: 1.25rem;
    --text-xl: 1.5rem;
    --text-2xl: 1.75rem;
    --text-3xl: 2.125rem;
    --text-4xl: 2.625rem;
    --text-5xl: 3.5rem;
  }
  
  .container {
    padding: var(--space-2xl) var(--space-lg);
  }
  
  .header-section {
    margin-bottom: var(--space-3xl);
    gap: var(--space-xl);
  }
  
  .recipe-grid {
    grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr));
    gap: var(--space-xl);
  }
  
  .recipe-header {
    grid-template-columns: 18.75rem 1fr;
    gap: var(--space-xl);
  }
  
  .modal-content {
    margin: 5% auto;
    width: 85%;
  }
  
  .recipe-detail-content {
    padding: var(--space-2xl);
  }
  
  .footer-container {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2xl);
  }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 62em) {
  .container {
    padding: var(--space-2xl) var(--space-xl);
  }
  
  .recipe-grid {
    grid-template-columns: repeat(auto-fill, minmax(22rem, 1fr));
    gap: var(--space-2xl);
  }
  
  .modal-content {
    width: 75%;
    max-width: 50rem;
  }
  
  .footer-container {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .popular-tags,
  .social-links {
    justify-content: flex-start;
  }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 75em) {
  .container {
    padding: var(--space-3xl) var(--space-xl);
  }
  
  .recipe-grid {
    grid-template-columns: repeat(auto-fill, minmax(24rem, 1fr));
  }
  
  .header-section {
    margin-bottom: var(--space-3xl);
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  .recipe-card:hover {
    transform: none;
  }
  
  .card-overlay {
    opacity: 1;
    background: rgba(0, 0, 0, 0.3);
  }
  
  .view-recipe-btn {
    padding: var(--space-lg) var(--space-xl);
    min-height: 3rem;
    font-size: var(--text-base);
  }
  
  .tag,
  .social-btn {
    min-height: 2.75rem;
    padding: var(--space-md) var(--space-lg);
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 2dppx) {
  .main-logo,
  .site-logo {
    image-rendering: -webkit-optimize-contrast; /* Safari/Chrome */
    -ms-interpolation-mode: nearest-neighbor; /* IE/Edge */
    image-rendering: pixelated; /* Fallback for all browsers */
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .particles {
    display: none;
  }
  
  body {
    animation: none;
    background: var(--primary-color);
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --text-dark: #f7fafc;
    --text-light: #a0aec0;
    --gray-50: #2d3748;
    --gray-100: #4a5568;
    --gray-200: #718096;
  }
}

/* Print styles */
@media print {
  .particles,
  .recipe-footer,
  #search-btn,
  .view-recipe-btn,
  .card-overlay {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .recipe-card {
    break-inside: avoid;
    box-shadow: none;
    border: 0.0625rem solid #ccc;
  }
}