/* Avatar Maker - Modern, Playful CSS Styling */

/* =============================================
   CSS Variables & Base Reset
   ============================================= */
:root {
  /* Color Palette */
  --gradient-start: #667eea;
  --gradient-mid: #764ba2;
  --gradient-end: #f093fb;
  --accent-pink: #f5576c;
  --success-green: #10b981;
  --error-red: #ef4444;
  --warning-yellow: #f59e0b;
  
  /* Glass Effect Colors */
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-bg-strong: rgba(255, 255, 255, 0.95);
  --glass-border: rgba(255, 255, 255, 0.5);
  --glass-shadow: rgba(31, 38, 135, 0.25);
  
  /* Text Colors */
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --text-light: rgba(255, 255, 255, 0.9);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
  
  /* Shadows */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 20px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.4);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
  line-height: 1.6;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* =============================================
   App Layout
   ============================================= */
.app-container {
  display: flex;
  min-height: 100vh;
  position: relative;
}

/* =============================================
   History Sidebar
   ============================================= */
.history-sidebar {
  width: 220px;
  min-height: 100vh;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid rgba(255, 255, 255, 0.2);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  overflow-y: auto;
  transition: transform var(--transition-normal), left var(--transition-normal);
}

.history-title {
  color: var(--text-light);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.history-title::before {
  content: "clock";
  font-size: 1.2rem;
}

.history-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
  flex: 1;
}

.history-thumbnail {
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  border: 2px solid transparent;
  opacity: 0.85;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.history-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.history-thumbnail:hover {
  transform: scale(1.08);
  opacity: 1;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
}

.history-thumbnail.active {
  border-color: var(--text-light);
  opacity: 1;
  box-shadow: var(--shadow-glow);
}

.history-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
  padding: var(--space-xl) var(--space-md);
}

/* =============================================
   Main Content Area
   ============================================= */
.main-content {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: var(--space-xl);
  overflow-y: auto;
}

/* =============================================
   Card - Frosted Glass Effect
   ============================================= */
.card {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  width: 100%;
  max-width: 580px;
  box-shadow: var(--shadow-lg), 0 0 0 1px var(--glass-border);
  border: 1px solid rgba(255, 255, 255, 0.3);
  animation: cardFadeIn 0.6s ease-out;
}

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* =============================================
   Card Header
   ============================================= */
.card-header {
  text-align: center;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.title {
  font-size: 2.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xs);
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.subtitle::before {
  content: "sparkles";
  font-size: 1rem;
}

/* =============================================
   Form Elements
   ============================================= */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

.prompt-textarea {
  width: 100%;
  padding: var(--space-md);
  border: 2px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  resize: vertical;
  min-height: 100px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  background: rgba(255, 255, 255, 0.8);
  color: var(--text-primary);
  line-height: 1.5;
}

.prompt-textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

.prompt-textarea:hover {
  border-color: rgba(102, 126, 234, 0.3);
}

.prompt-textarea:focus {
  outline: none;
  border-color: var(--gradient-start);
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
  background: white;
}

.form-row {
  display: flex;
  gap: var(--space-md);
  align-items: flex-end;
}

.resolution-group {
  flex-shrink: 0;
}

.resolution-select {
  padding: 0.8rem var(--space-md);
  border: 2px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  background: white;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-width: 80px;
}

.resolution-select:hover {
  border-color: rgba(102, 126, 234, 0.3);
}

.resolution-select:focus {
  outline: none;
  border-color: var(--gradient-start);
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
}

/* =============================================
   Buttons
   ============================================= */
.btn {
  padding: 0.85rem var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
  pointer-events: none;
}

.btn:hover:not(:disabled) {
  transform: translateY(-2px);
}

.btn:active:not(:disabled) {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  font-size: 1.1rem;
  transition: transform var(--transition-fast);
}

.btn:hover:not(:disabled) .btn-icon {
  transform: scale(1.2);
}

/* Generate Button - Primary Gradient */
.btn-generate {
  flex: 1;
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-generate:hover:not(:disabled) {
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

/* Edit Button - Pink Gradient */
.btn-edit {
  flex: 1;
  background: linear-gradient(135deg, var(--gradient-end) 0%, var(--accent-pink) 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(245, 87, 108, 0.35);
}

.btn-edit:hover:not(:disabled) {
  box-shadow: 0 8px 25px rgba(245, 87, 108, 0.5);
}

/* Download Button - Success Green */
.btn-download {
  background: linear-gradient(135deg, #34d399 0%, var(--success-green) 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
  padding: 0.7rem var(--space-md);
  font-size: 0.9rem;
}

.btn-download:hover:not(:disabled) {
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.5);
}

/* =============================================
   Loading State
   ============================================= */
.loading-container {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.spinner {
  width: 56px;
  height: 56px;
  border: 4px solid rgba(102, 126, 234, 0.15);
  border-top-color: var(--gradient-start);
  border-right-color: var(--gradient-mid);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--space-lg);
}

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

.loading-text {
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* =============================================
   Result Section
   ============================================= */
.result-section {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  animation: slideUp 0.5s ease-out;
}

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

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.result-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.result-title::before {
  content: "frame";
  font-size: 1.3rem;
}

/* =============================================
   Avatar Display
   ============================================= */
.avatar-container {
  text-align: center;
  margin-bottom: var(--space-lg);
  animation: avatarReveal 0.6s ease-out;
}

@keyframes avatarReveal {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.avatar-image {
  max-width: 100%;
  max-height: 500px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 3px solid rgba(255, 255, 255, 0.8);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
}

.avatar-image:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

/* =============================================
   Edit Section
   ============================================= */
.edit-section {
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding-top: var(--space-lg);
  margin-top: var(--space-lg);
  animation: fadeIn var(--transition-normal);
}

.edit-section .form-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.edit-section .form-label::before {
  content: "edit";
  font-size: 1rem;
}

/* =============================================
   Toast Notifications
   ============================================= */
.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 360px;
}

.toast {
  background: var(--text-primary);
  color: white;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toastSlideIn 0.4s ease-out;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.toast::before {
  content: "info";
  font-size: 1.1rem;
}

.toast.error {
  background: linear-gradient(135deg, var(--error-red) 0%, #dc2626 100%);
}

.toast.error::before {
  content: "warning";
}

.toast.success {
  background: linear-gradient(135deg, var(--success-green) 0%, #059669 100%);
}

.toast.success::before {
  content: "check";
}

@keyframes toastSlideIn {
  from {
    transform: translateX(100%) scale(0.8);
    opacity: 0;
  }
  to {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

@keyframes toastSlideOut {
  from {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
  to {
    transform: translateX(100%) scale(0.8);
    opacity: 0;
  }
}

.toast.hiding {
  animation: toastSlideOut 0.3s ease-in forwards;
}

/* =============================================
   Mobile History Toggle
   ============================================= */
.history-toggle {
  display: none;
  position: fixed;
  bottom: var(--space-lg);
  left: var(--space-lg);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  font-size: 1.5rem;
  z-index: 50;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  align-items: center;
  justify-content: center;
}

.history-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.history-toggle:active {
  transform: scale(0.95);
}

/* =============================================
   Utility Classes
   ============================================= */
[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* =============================================
   Mobile Responsive - Mobile First
   ============================================= */
@media (max-width: 768px) {
  :root {
    --space-xl: 1.5rem;
    --space-lg: 1rem;
  }
  
  .history-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 240px;
    z-index: 100;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }
  
  .history-sidebar.open {
    transform: translateX(0);
  }
  
  .history-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    animation: fadeIn var(--transition-fast);
  }
  
  .history-overlay.visible {
    display: block;
  }
  
  .history-toggle {
    display: flex;
  }
  
  .main-content {
    padding: var(--space-md);
  }
  
  .card {
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    max-width: 100%;
  }
  
  .title {
    font-size: 1.75rem;
  }
  
  .subtitle {
    font-size: 0.85rem;
  }
  
  .form-row {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .resolution-group {
    width: 100%;
  }
  
  .resolution-select {
    width: 100%;
  }
  
  .btn-generate,
  .btn-edit {
    width: 100%;
  }
  
  .result-header {
    flex-direction: column;
    gap: var(--space-md);
    align-items: stretch;
  }
  
  .btn-download {
    width: 100%;
  }
  
  .toast-container {
    left: var(--space-md);
    right: var(--space-md);
    bottom: calc(var(--space-lg) + 70px);
    max-width: none;
  }
  
  .avatar-image {
    max-height: 350px;
  }
}

@media (max-width: 480px) {
  .title {
    font-size: 1.5rem;
  }
  
  .card-header {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
  }
  
  .prompt-textarea {
    min-height: 80px;
    font-size: 0.95rem;
  }
  
  .history-sidebar {
    width: 200px;
  }
  
  .history-list {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xs);
  }
}

/* =============================================
   Dark Mode Support (Optional Enhancement)
   ============================================= */
@media (prefers-color-scheme: dark) {
  /* Future enhancement: Add dark mode styles here */
}

/* =============================================
   Reduced Motion Support
   ============================================= */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* =============================================
   Print Styles
   ============================================= */
@media print {
  .history-sidebar,
  .history-toggle,
  .toast-container,
  .btn-generate,
  .btn-edit,
  .edit-section {
    display: none !important;
  }
  
  body {
    background: white;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}