/* CaloriesSnap - Main Styles */

/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --primary: #667eea;
  --primary-dark: #5568d3;
  --primary-light: #818cf8;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

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

html, body {
  height: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-y: auto;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

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

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

/* ===== UTILITY CLASSES ===== */
.hidden {
  display: none !important;
}

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

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

.text-success {
  color: var(--success);
}

.text-error {
  color: var(--error);
}

/* ===== BUTTONS ===== */
button {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
}

button:active {
  transform: scale(0.95);
}

.cta-button {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.save-btn, .secondary-btn {
  background: var(--primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
  width: 100%;
  margin-top: var(--spacing-md);
}

.save-btn:hover, .secondary-btn:hover {
  background: var(--primary-dark);
}

.danger-btn {
  background: var(--error);
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
  width: 100%;
  margin-top: var(--spacing-md);
}

.danger-btn:hover {
  background: #dc2626;
}

.icon-btn {
  background: transparent;
  color: var(--text-secondary);
  padding: var(--spacing-sm);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn:hover {
  background: var(--bg-tertiary);
}

.link-btn {
  display: block;
  color: var(--primary);
  text-decoration: none;
  padding: var(--spacing-sm) 0;
  margin-top: var(--spacing-sm);
}

.link-btn:hover {
  text-decoration: underline;
}

/* ===== INPUTS ===== */
input[type="text"],
input[type="number"],
input[type="email"],
select,
textarea {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
  width: 100%;
}

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

/* ===== TOGGLE SWITCH ===== */
.toggle {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: var(--transition-base);
  border-radius: var(--radius-full);
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: var(--transition-base);
  border-radius: 50%;
}

.toggle input:checked + .toggle-slider {
  background-color: var(--primary);
}

.toggle input:checked + .toggle-slider:before {
  transform: translateX(22px);
}

/* ===== CARDS ===== */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-md);
}

/* ===== LANDING PAGE ===== */
.landing-page {
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.hero-section {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.hero-icon {
  font-size: 80px;
  margin-bottom: var(--spacing-md);
  animation: bounce 2s infinite;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  color: white;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
  opacity: 0.95;
}

.hero-tagline {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-xl);
  opacity: 0.85;
}

.hero-stats {
  display: flex;
  justify-content: space-around;
  margin: var(--spacing-2xl) 0;
  gap: var(--spacing-md);
}

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

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--font-size-sm);
  opacity: 0.85;
}

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

.feature-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
}

.feature-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  color: white;
}

.feature-card p {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  margin-bottom: 0;
}

/* ===== PWA INSTALL BANNER ===== */
.pwa-install-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: var(--spacing-md);
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  animation: slideDown var(--transition-base);
}

.banner-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

.banner-icon {
  font-size: 32px;
}

.banner-text {
  flex: 1;
}

.banner-text strong {
  display: block;
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-xs);
}

.banner-text p {
  font-size: var(--font-size-sm);
  margin: 0;
  opacity: 0.9;
}

.install-btn {
  background: white;
  color: var(--primary);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-weight: 700;
  border-radius: var(--radius-md);
  white-space: nowrap;
}

.close-btn {
  background: transparent;
  color: white;
  font-size: 24px;
  padding: var(--spacing-xs);
  width: 32px;
  height: 32px;
  line-height: 1;
  border-radius: var(--radius-sm);
}

.close-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  background: white;
  color: var(--text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  min-width: 300px;
  animation: slideInRight var(--transition-base);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

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

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

/* ===== MODAL ===== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 9998;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: var(--radius-xl);
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  animation: slideUp var(--transition-base);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  margin: 0;
  font-size: var(--font-size-xl);
}

.modal-close {
  background: transparent;
  color: var(--text-secondary);
  font-size: 28px;
  width: 32px;
  height: 32px;
  padding: 0;
  line-height: 1;
  border-radius: var(--radius-sm);
}

.modal-close:hover {
  background: var(--bg-tertiary);
}

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

/* ===== CONFETTI CANVAS ===== */
.confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 28px;
    --font-size-3xl: 24px;
    --font-size-2xl: 20px;
  }
  
  .toast-container {
    right: var(--spacing-sm);
    left: var(--spacing-sm);
  }
  
  .toast {
    min-width: auto;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== DARK THEME ===== */
body.theme-dark {
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-light: #9ca3af;
  --bg-primary: #1f2937;
  --bg-secondary: #111827;
  --bg-tertiary: #374151;
  --border-color: #374151;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

body.theme-dark .landing-page {
  background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
}

body.theme-dark .calorie-ring .ring-bg {
  stroke: var(--bg-tertiary);
}

body.theme-dark .pwa-install-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

body.theme-dark .feature-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
  background: var(--text-light);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}