@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-red: #ef4444;
  --color-green: #10b981;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--color-gray-50);
  color: var(--color-gray-900);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header {
  background: white;
  border-bottom: 1px solid var(--color-gray-200);
  padding: 20px 0;
  margin-bottom: 40px;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-gray-900);
  text-decoration: none;
}

nav a {
  color: var(--color-gray-600);
  text-decoration: none;
  margin-left: 24px;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--color-primary);
}

/* Forms */
.form-container {
  max-width: 480px;
  margin: 80px auto;
  background: white;
  padding: 48px;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
}

.form-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-gray-900);
}

.form-subtitle {
  color: var(--color-gray-500);
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 24px;
}

label {
  display: block;
  font-weight: 500;
  color: var(--color-gray-700);
  margin-bottom: 8px;
  font-size: 14px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"] {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-gray-300);
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
}

input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

button {
  width: 100%;
  padding: 12px 24px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  font-family: inherit;
}

button:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

button:active:not(:disabled) {
  transform: scale(0.98);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.link {
  text-align: center;
  margin-top: 24px;
  color: var(--color-gray-600);
}

.link a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

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

/* Generate page */
.generate-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 24px;
}

.mode-toggle {
  display: flex;
  gap: 12px;
  margin-bottom: 32px;
  background: white;
  padding: 8px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.mode-toggle button {
  flex: 1;
  padding: 12px;
  background: transparent;
  color: var(--color-gray-600);
  border: none;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.2s;
}

.mode-toggle button.active {
  background: var(--color-primary);
  color: white;
}

.upload-area {
  background: white;
  border: 2px dashed var(--color-gray-300);
  border-radius: 12px;
  padding: 64px 32px;
  text-align: center;
  transition: border-color 0.2s;
  cursor: pointer;
}

.upload-area:hover {
  border-color: var(--color-primary);
}

.upload-area.dragover {
  border-color: var(--color-primary);
  background: var(--color-gray-50);
}

.upload-area input[type="file"] {
  display: none;
}

.result-container {
  margin-top: 32px;
  background: white;
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.result-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.result-image {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.result-image img {
  width: 100%;
  height: auto;
  display: block;
}

.result-image-label {
  padding: 12px;
  background: var(--color-gray-50);
  font-weight: 500;
  color: var(--color-gray-700);
  text-align: center;
}

/* History page */
.history-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

.page-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 40px;
  color: var(--color-gray-900);
}

.generations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.generation-card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.generation-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.generation-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.generation-card-content {
  padding: 20px;
}

.generation-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.generation-card-date {
  font-size: 14px;
  color: var(--color-gray-500);
}

.generation-card-source {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-gray-100);
  color: var(--color-gray-700);
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.generation-card-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.btn-secondary {
  background: var(--color-gray-100);
  color: var(--color-gray-700);
  padding: 8px 16px;
  font-size: 14px;
}

.btn-secondary:hover {
  background: var(--color-gray-200);
}

.btn-danger {
  background: var(--color-red);
  color: white;
}

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

/* Detail page */
.detail-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

.detail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.detail-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.detail-image-container {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.detail-image-container img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.detail-image-label {
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-gray-700);
}

.detail-metadata {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.metadata-row {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.metadata-row:last-child {
  border-bottom: none;
}

.metadata-label {
  font-weight: 500;
  color: var(--color-gray-600);
}

.metadata-value {
  color: var(--color-gray-900);
}

/* Loading skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--color-gray-200) 25%, var(--color-gray-100) 50%, var(--color-gray-200) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

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

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

/* Responsive */
@media (max-width: 768px) {
  .result-images,
  .detail-images {
    grid-template-columns: 1fr;
  }

  .generations-grid {
    grid-template-columns: 1fr;
  }

  .form-container {
    margin: 40px auto;
    padding: 32px 24px;
  }
}