/**
 * Camel Worth Calculator - Styles
 * Mobile-first, beautiful, and delightful
 */

:root {
  --primary: #FF6B35;
  --primary-dark: #E55A2B;
  --secondary: #4ECDC4;
  --background: #F7F9FC;
  --surface: #FFFFFF;
  --text: #2C3E50;
  --text-light: #7F8C8D;
  --border: #E1E8ED;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-lg: rgba(0, 0, 0, 0.15);
  --success: #27AE60;
  --error: #E74C3C;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  --radius: 16px;
  --radius-sm: 8px;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

.container {
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  position: relative;
}

.screen {
  display: none;
  width: 100%;
  max-width: 420px;
  animation: fadeIn 0.4s ease-out;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.screen-content {
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  box-shadow: 0 20px 60px var(--shadow-lg);
  position: relative;
}

/* Typography */
h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--spacing-xs);
  text-align: center;
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--spacing-sm);
}

.subtitle {
  text-align: center;
  color: var(--text-light);
  margin-bottom: var(--spacing-xl);
  font-size: 1rem;
}

.icon-large {
  font-size: 4rem;
  text-align: center;
  margin-bottom: var(--spacing-md);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Choice Buttons */
.choice-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.choice-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
  min-height: 64px;
  touch-action: manipulation;
}

.choice-btn:active {
  transform: scale(0.98);
  box-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
}

.btn-icon {
  font-size: 1.5rem;
}

/* Back Button */
.back-btn {
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1rem;
  cursor: pointer;
  padding: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  transition: var(--transition);
  touch-action: manipulation;
}

.back-btn:active {
  color: var(--text);
}

/* Form Styles */
.input-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.form-group input[type="number"],
.form-group input[type="text"],
.form-group select {
  padding: var(--spacing-md);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
  background: var(--surface);
  color: var(--text);
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%232C3E50' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-sm) center;
  background-size: 12px;
  padding-right: calc(var(--spacing-md) + 20px);
  cursor: pointer;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

/* Slider */
.slider {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--border);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 6px var(--shadow);
  transition: var(--transition);
}

.slider::-webkit-slider-thumb:active {
  transform: scale(1.2);
}

.slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 6px var(--shadow);
  transition: var(--transition);
}

.slider-value {
  text-align: center;
  font-weight: 600;
  color: var(--primary);
  font-size: 1.125rem;
}

/* Calculate Button */
.calculate-btn {
  padding: var(--spacing-md);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
  margin-top: var(--spacing-sm);
  min-height: 56px;
  touch-action: manipulation;
}

.calculate-btn:active {
  transform: scale(0.98);
}

.calculate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Photo Upload */
.photo-upload-area {
  position: relative;
  width: 100%;
  min-height: 300px;
  border: 3px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  overflow: hidden;
  background: var(--background);
}

.photo-upload-area:active {
  border-color: var(--primary);
  background: rgba(255, 107, 53, 0.05);
}

#photo-input {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 2;
}

.upload-placeholder {
  text-align: center;
  padding: var(--spacing-xl);
  z-index: 1;
}

.upload-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: var(--spacing-sm);
}

.photo-preview {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

/* Analyzing State */
.analyzing {
  text-align: center;
  padding: var(--spacing-xl);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Results */
.result-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.result-value {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.1) 0%, rgba(78, 205, 196, 0.1) 100%);
  border-radius: var(--radius);
}

.camel-number {
  font-size: 4rem;
  font-weight: 700;
  color: var(--primary);
  display: block;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.camel-label {
  font-size: 1.25rem;
  color: var(--text-light);
  font-weight: 500;
}

.result-breakdown {
  margin-bottom: var(--spacing-lg);
}

.breakdown-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  background: var(--background);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.breakdown-label {
  color: var(--text-light);
}

.breakdown-value {
  font-weight: 600;
  color: var(--text);
}

/* Action Buttons */
.result-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.action-btn {
  flex: 1;
  padding: var(--spacing-md);
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  min-height: 48px;
  touch-action: manipulation;
}

.action-btn.primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.action-btn.secondary {
  background: var(--background);
  color: var(--text);
  border: 2px solid var(--border);
}

.action-btn:active {
  transform: scale(0.98);
}

/* Responsive Adjustments */
@media (max-width: 480px) {
  .container {
    padding: var(--spacing-sm);
  }
  
  .screen-content {
    padding: var(--spacing-lg);
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  .camel-number {
    font-size: 3rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible for keyboard navigation */
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}