/* ============================================
   WhosThat - Design System & Styles
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Colors - Dark Cinema Theme */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-card: #1a1a24;
  --color-bg-elevated: #22222e;
  
  --color-accent-primary: #6366f1;
  --color-accent-secondary: #8b5cf6;
  --color-accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  
  --color-text-primary: #ffffff;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- App Container --- */
.app-container {
  max-width: 430px;
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
  background: var(--color-bg-primary);
}

/* --- Screens --- */
.screen {
  display: none;
  padding: var(--space-6);
  min-height: 100vh;
  animation: fadeIn var(--transition-base);
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Header --- */
.app-header {
  text-align: center;
  padding: var(--space-8) 0;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}

.logo-icon {
  font-size: 2.5rem;
}

.logo h1 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  margin-top: var(--space-2);
}

/* --- Capture Section --- */
.capture-section {
  margin-top: var(--space-8);
}

.capture-area {
  background: var(--color-bg-secondary);
  border: 2px dashed var(--color-accent-primary);
  border-radius: var(--radius-2xl);
  padding: var(--space-12) var(--space-6);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.capture-area:hover {
  border-color: var(--color-accent-secondary);
  background: var(--color-bg-card);
  box-shadow: var(--shadow-glow);
}

.capture-area:active {
  transform: scale(0.98);
}

.capture-prompt {
  text-align: center;
  position: relative;
}

.pulse-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  border: 2px solid var(--color-accent-primary);
  border-radius: var(--radius-full);
  animation: pulse 2s infinite;
  opacity: 0.5;
}

@keyframes pulse {
  0% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
  50% { transform: translate(-50%, -50%) scale(1.3); opacity: 0; }
  100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
}

.capture-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.capture-prompt p {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

.capture-prompt .hint {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* --- Divider --- */
.or-divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: var(--space-6) 0;
  color: var(--color-text-muted);
}

.or-divider::before,
.or-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-bg-elevated);
}

/* --- Demo Button --- */
.demo-btn {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  background: var(--color-bg-card);
  border: 1px solid var(--color-bg-elevated);
  border-radius: var(--radius-xl);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.demo-btn:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-accent-primary);
}

/* --- Recent Section --- */
.recent-section {
  margin-top: var(--space-10);
}

.recent-section h2 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.recent-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.empty-state {
  text-align: center;
  padding: var(--space-8);
  color: var(--color-text-muted);
}

.empty-state span {
  font-size: 2.5rem;
  display: block;
  margin-bottom: var(--space-3);
}

.recent-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.recent-item:hover {
  background: var(--color-bg-elevated);
}

.recent-item img {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  object-fit: cover;
}

.recent-item-info h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
}

.recent-item-info p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* --- Loading Screen --- */
.loading-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-primary);
}

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

.scanning-animation {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--space-8);
  position: relative;
}

.scan-face {
  width: 100%;
  height: 100%;
  border: 3px solid var(--color-accent-primary);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  background: var(--color-bg-secondary);
}

.scan-face::before,
.scan-face::after {
  content: '';
  position: absolute;
  background: var(--color-accent-primary);
}

/* Corner markers */
.scan-face::before {
  width: 20px;
  height: 20px;
  top: -3px;
  left: -3px;
  border-top: 3px solid var(--color-accent-secondary);
  border-left: 3px solid var(--color-accent-secondary);
  background: transparent;
}

.scan-line {
  position: absolute;
  width: 100%;
  height: 3px;
  background: var(--color-accent-gradient);
  box-shadow: var(--shadow-glow);
  animation: scan 1.5s ease-in-out infinite;
}

@keyframes scan {
  0% { top: 0; }
  50% { top: calc(100% - 3px); }
  100% { top: 0; }
}

.loading-content h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

.loading-hint {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* --- Result Screen --- */
.result-screen {
  padding-top: var(--space-4);
}

.back-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  cursor: pointer;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

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

.result-content {
  margin-top: var(--space-4);
}

.match-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(34, 197, 94, 0.15);
  color: var(--color-success);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-6);
}

.actor-card {
  display: flex;
  gap: var(--space-5);
  align-items: center;
  margin-bottom: var(--space-8);
}

.actor-photo-container {
  flex-shrink: 0;
}

.actor-photo {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-xl);
  object-fit: cover;
  border: 3px solid var(--color-accent-primary);
  box-shadow: var(--shadow-glow);
}

.actor-name {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-2);
}

.actor-meta {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* --- Known For Section --- */
.known-for-section {
  margin-bottom: var(--space-8);
}

.known-for-section h2,
.filmography-section h2 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
}

.known-for-list {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  padding-bottom: var(--space-2);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.known-for-list::-webkit-scrollbar {
  display: none;
}

.known-for-item {
  flex-shrink: 0;
  width: 120px;
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.known-for-item:hover {
  transform: translateY(-4px);
}

.known-for-item img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-2);
}

.known-for-item h4 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.known-for-item p {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* --- Filmography Section --- */
.filmography-tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.tab {
  flex: 1;
  padding: var(--space-3);
  background: var(--color-bg-card);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab.active {
  background: var(--color-accent-primary);
  color: var(--color-text-primary);
}

.tab:hover:not(.active) {
  background: var(--color-bg-elevated);
}

.filmography-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-height: 300px;
  overflow-y: auto;
}

.filmography-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
}

.filmography-item h4 {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.filmography-item .role {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.filmography-item .year {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* --- Action Buttons --- */
.action-buttons {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.action-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4);
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-btn.primary {
  background: var(--color-accent-gradient);
  color: var(--color-text-primary);
}

.action-btn.primary:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.action-btn.secondary {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  border: 1px solid var(--color-bg-elevated);
}

.action-btn.secondary:hover {
  background: var(--color-bg-elevated);
}

/* --- Error Screen --- */
.error-screen {
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-content {
  text-align: center;
  max-width: 280px;
}

.error-icon {
  font-size: 4rem;
  margin-bottom: var(--space-6);
}

.error-content h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-3);
}

.error-content p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.error-content ul {
  list-style: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  text-align: left;
  margin-bottom: var(--space-6);
}

.error-content li {
  margin-bottom: var(--space-2);
}

.retry-btn {
  background: var(--color-accent-gradient);
  color: var(--color-text-primary);
  border: none;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.retry-btn:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* --- Accessibility --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus states for keyboard navigation */
button:focus-visible,
.capture-area:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}

/* --- Mobile Adjustments --- */
@media (max-width: 380px) {
  :root {
    font-size: 14px;
  }
  
  .screen {
    padding: var(--space-4);
  }
}