/* === Design Tokens === */
:root {
  /* Colors - Rich Renaissance-inspired palette */
  --color-bg: #0d0b0e;
  --color-bg-card: rgba(26, 22, 30, 0.8);
  --color-surface: rgba(45, 38, 52, 0.6);
  --color-border: rgba(255, 215, 140, 0.15);
  --color-border-hover: rgba(255, 215, 140, 0.3);

  --color-gold: #d4a853;
  --color-gold-light: #f0d78c;
  --color-gold-dark: #a67c32;

  --color-text: #f5f0e8;
  --color-text-muted: rgba(245, 240, 232, 0.6);
  --color-text-subtle: rgba(245, 240, 232, 0.4);

  --color-accent: linear-gradient(135deg, #d4a853 0%, #a67c32 100%);
  --color-accent-hover: linear-gradient(135deg, #f0d78c 0%, #d4a853 100%);

  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* === Background Texture === */
.background-texture {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(212, 168, 83, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(166, 124, 50, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(26, 22, 30, 0.9) 0%, transparent 100%);
}

.background-texture::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  opacity: 0.05;
  mix-blend-mode: overlay;
}

.background-texture::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 50% 50%, transparent 0%, var(--color-bg) 80%);
  opacity: 0.4;
}

/* === Layout === */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-xl);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* === Header === */
.header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 5.5rem);
  font-weight: 700;
  background: var(--color-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-xs);
  filter: drop-shadow(0 0 10px rgba(212, 168, 83, 0.2));
}

.subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* === Card === */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  backdrop-filter: blur(20px);
  box-shadow:
    0 12px 48px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 215, 140, 0.08) inset;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  border-color: rgba(255, 215, 140, 0.25);
  box-shadow:
    0 16px 64px rgba(0, 0, 0, 0.6),
    0 0 20px rgba(212, 168, 83, 0.05);
}

/* === Upload Section === */
.upload-section {
  width: 100%;
}

.upload-area {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  cursor: pointer;
  transition:
    border-color var(--transition-base),
    background-color var(--transition-base),
    transform var(--transition-fast);
}

.upload-area:hover {
  border-color: var(--color-gold);
  background: rgba(212, 168, 83, 0.05);
}

.upload-area.drag-over {
  border-color: var(--color-gold-light);
  background: rgba(212, 168, 83, 0.1);
  transform: scale(1.01);
}

.upload-icon {
  color: var(--color-gold);
  margin-bottom: var(--space-lg);
  opacity: 0.8;
}

.upload-text {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.upload-hint {
  font-size: 0.875rem;
  color: var(--color-text-subtle);
}

/* === Preview Section === */
.preview-section {
  width: 100%;
}

.preview-section.hidden {
  display: none;
}

.images-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.image-box {
  position: relative;
  flex: 1;
  min-width: 200px;
  max-width: 320px;
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.image-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-label {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  background: rgba(13, 11, 14, 0.8);
  backdrop-filter: blur(8px);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-gold-light);
  border: 1px solid var(--color-border);
  z-index: 10;
}

.image-box img {
  opacity: 0;
  transition: opacity 1.2s ease-in-out;
}

.image-box img.show {
  opacity: 1;
}

.fade-section {
  animation: fadeIn 0.6s ease-out forwards;
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.arrow-icon {
  color: var(--color-gold);
  opacity: 0.6;
  flex-shrink: 0;
}

.result-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.result-placeholder img {
  display: none;
}

.result-placeholder img:not(.hidden) {
  display: block;
}

/* === Loading Spinner === */
.loading-spinner {
  text-align: center;
}

.loading-spinner.hidden {
  display: none;
}

.spinner {
  width: 56px;
  height: 56px;
  border: 2px solid var(--color-surface);
  border-top-color: var(--color-gold);
  border-right-color: var(--color-gold-dark);
  border-radius: 50%;
  animation: spin 1.2s cubic-bezier(0.5, 0.1, 0.4, 0.9) infinite;
  margin: 0 auto var(--space-lg);
  filter: drop-shadow(0 0 8px rgba(212, 168, 83, 0.4));
}

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

.loading-spinner p {
  font-size: 1rem;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-gold-light);
  letter-spacing: 0.02em;
}

/* === Buttons === */
.actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
}

.actions-row {
  display: flex;
  flex-direction: row;
  gap: var(--space-md);
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

/* === Section Transitions === */
section-transitioning {
  opacity: 0;
  transform: translateY(10px);
}

.section-enter {
  animation: sectionEnter 0.5s var(--transition-base) forwards;
}

@keyframes sectionEnter {
  from {
    opacity: 0;
    transform: translateY(15px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-base),
    opacity var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 4px 16px rgba(212, 168, 83, 0.3);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow:
    0 8px 32px rgba(212, 168, 83, 0.4),
    0 0 0 1px rgba(255, 215, 140, 0.4);
}

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

.btn-secondary {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  background: var(--color-surface);
}

.btn-icon {
  font-size: 1.1em;
}

.btn-icon-only {
  padding: var(--space-md);
  aspect-ratio: 1;
}

/* === Footer === */
.footer {
  text-align: center;
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
}

.footer p {
  font-size: 0.875rem;
  color: var(--color-text-subtle);
}

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

/* === Responsive === */
@media (max-width: 640px) {
  .container {
    padding: var(--space-lg);
  }

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

  .images-container {
    flex-direction: column;
  }

  .arrow-icon {
    transform: rotate(90deg);
  }

  .image-box {
    max-width: 100%;
    width: 100%;
  }
}