/* ====================================
   BURGER WEBSITE - GLOBAL STYLES
   ==================================== */

/* ========== CSS RESET & BASE ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Arial', 'Helvetica', sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

/* ========== CSS CUSTOM PROPERTIES ========== */
:root {
  /* Colors */
  --color-primary: #FFA500;
  --color-primary-dark: #FF8C00;
  --color-primary-light: #FFB833;
  --color-secondary: #FF6347;
  --color-dark: #0D0D0D;
  --color-dark-alt: #1A1A1A;
  --color-gray-dark: #333333;
  --color-gray: #666666;
  --color-gray-light: #999999;
  --color-gray-lighter: #CCCCCC;
  --color-white: #FFFFFF;
  --color-bg: #F5F5F5;
  --color-success: #28A745;
  --color-error: #DC3545;
  --color-warning: #FFC107;
  
  /* Typography */
  --font-primary: 'Arial', 'Helvetica', sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */
  --font-size-4xl: 2.5rem;    /* 40px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 4rem;      /* 64px */
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 80px;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.4s ease;
}

/* ========== TYPOGRAPHY ========== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-gray);
}

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

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

/* ========== LAYOUT ========== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-4xl) 0;
}

.section-sm {
  padding: var(--spacing-3xl) 0;
}

/* ========== HEADER & NAVIGATION ========== */
.header {
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  padding: 0 var(--spacing-lg);
}

.logo {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-dark);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
}

.nav-link {
  color: var(--color-dark);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) 0;
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
}

.cart-icon {
  position: relative;
  cursor: pointer;
  font-size: var(--font-size-xl);
}

.cart-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background-color: var(--color-secondary);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--color-dark);
  transition: all var(--transition-base);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-dark);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: var(--color-gray-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* ========== FORMS ========== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-dark);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-md);
  font-size: var(--font-size-base);
  border: 2px solid var(--color-gray-lighter);
  border-radius: var(--border-radius-md);
  transition: border-color var(--transition-fast);
  font-family: inherit;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
}

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

.form-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  display: none;
}

.form-group.error .form-error {
  display: block;
}

.form-group.error .form-input,
.form-group.error .form-textarea {
  border-color: var(--color-error);
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* ========== CARDS ========== */
.card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.card-img {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

.card-body {
  padding: var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--color-gray);
  margin-bottom: var(--spacing-md);
}

.card-price {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

/* ========== GRID ========== */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

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

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

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

/* ========== HERO SECTION ========== */
.hero {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-alt) 100%);
  color: var(--color-white);
  padding: var(--spacing-4xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,165,0,0.1)"/></svg>');
  background-size: 50px 50px;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: var(--font-size-6xl);
  margin-bottom: var(--spacing-lg);
  color: var(--color-white);
  animation: fadeInUp 0.8s ease;
}

.hero-text {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-2xl);
  color: var(--color-gray-lighter);
  animation: fadeInUp 1s ease;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1.2s ease;
}

/* ========== FOOTER ========== */
.footer {
  background-color: var(--color-dark);
  color: var(--color-gray-light);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
}

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

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--color-gray-light);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-gray-dark);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-link {
  width: 40px;
  height: 40px;
  background-color: var(--color-gray-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background-color: var(--color-primary);
  transform: translateY(-3px);
}

/* ========== UTILITY CLASSES ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.hidden { display: none; }

.flex { display: flex; }
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* ========== ANIMATIONS ========== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.fade-in { animation: fadeIn 0.6s ease; }
.fade-in-up { animation: fadeInUp 0.8s ease; }
.fade-in-down { animation: fadeInDown 0.8s ease; }
.slide-in-left { animation: slideInLeft 0.8s ease; }
.slide-in-right { animation: slideInRight 0.8s ease; }

/* ========== TOAST NOTIFICATIONS ========== */
.toast {
  position: fixed;
  top: 100px;
  right: 20px;
  background-color: var(--color-white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  min-width: 300px;
  animation: slideInRight 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
}

.toast.success {
  border-left: 4px solid var(--color-success);
}

.toast.error {
  border-left: 4px solid var(--color-error);
}

.toast.warning {
  border-left: 4px solid var(--color-warning);
}

@keyframes fadeOut {
  to {
    opacity: 0;
    transform: translateX(20px);
  }
}

/* ========== RESPONSIVE DESIGN ========== */

/* Tablet (768px - 1023px) */
@media (max-width: 1023px) {
  :root {
    --font-size-6xl: 3rem;
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile (max-width: 767px) */
@media (max-width: 767px) {
  :root {
    --font-size-6xl: 2.5rem;
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  /* Mobile Navigation */
  .menu-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-xl);
    gap: var(--spacing-lg);
    transition: left var(--transition-base);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .grid-4,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

/* ========== PAGE-SPECIFIC STYLES ========== */

/* Menu Page */
.category-filters {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
  flex-wrap: wrap;
  justify-content: center;
}

.filter-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-white);
  border: 2px solid var(--color-gray-lighter);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
font-weight: var(--font-weight-medium);
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* Cart Page */
.cart-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: var(--spacing-lg);
  align-items: center;
  padding: var(--spacing-lg);
  background-color: var(--color-white);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.cart-item-img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--border-radius-md);
}

.cart-item-details h3 {
  margin-bottom: var(--spacing-sm);
}

.quantity-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.quantity-btn {
  width: 30px;
  height: 30px;
  border: none;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-weight: var(--font-weight-bold);
  transition: background-color var(--transition-fast);
}

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

.cart-summary {
  background-color: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
}

.summary-row.total {
  border-top: 2px solid var(--color-gray-lighter);
  padding-top: var(--spacing-md);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

.empty-cart {
  text-align: center;
  padding: var(--spacing-4xl) 0;
}

.empty-cart-icon {
  font-size: 5rem;
  color: var(--color-gray-lighter);
  margin-bottom: var(--spacing-lg);
}

/* Auth Pages */
.auth-container {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl) 0;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-white) 100%);
}

.auth-card {
  background-color: var(--color-white);
  padding: var(--spacing-2xl);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 450px;
  animation: fadeInUp 0.6s ease;
}

.auth-card h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.auth-links {
  text-align: center;
  margin-top: var(--spacing-lg);
  color: var(--color-gray);
}

.auth-links a {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

/* Contact Page */
.contact-info {
  background-color: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.contact-icon {
  width: 50px;
  height: 50px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
}

/* About Page */
.about-section {
  margin-bottom: var(--spacing-3xl);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about-img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

@media (max-width: 767px) {
  .cart-item {
    grid-template-columns: 80px 1fr;
  }
  
  .cart-item-actions {
    grid-column: 1 / -1;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .about-content {
    grid-template-columns: 1fr;
  }
}

/* ========== LOADING SPINNER ========== */
.spinner {
  border: 4px solid var(--color-gray-lighter);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

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

/* Placeholder images for menu items without actual images */
.card-img-placeholder {
  width: 100%;
  height: 250px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
}