/* ==================== CSS Variables ==================== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #a855f7;
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-tertiary: #1a1a24;
  --bg-card: #16161f;
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border: #27272a;
  --success: #22c55e;
  --error: #ef4444;
  --warning: #f59e0b;
  --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ==================== App Container ==================== */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==================== Header ==================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
}

.logo-icon {
  font-size: 1.75rem;
}

.logo-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-lang {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-lang:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--primary);
}

.credits-badge {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(168, 85, 247, 0.2) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.9rem;
}

.credits-icon {
  font-size: 1rem;
}

#creditsCount {
  color: var(--primary-light);
}

/* ==================== Ad Banners ==================== */
.ad-banner {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.ad-top {
  border-bottom: 1px solid var(--border);
  border-top: none;
}

.ad-bottom {
  border-top: 1px solid var(--border);
  border-bottom: none;
  margin-top: auto;
}

.ad-placeholder {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(255,255,255,0.02) 10px,
    rgba(255,255,255,0.02) 20px
  );
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  margin: 0.75rem auto;
}

.ad-placeholder span {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ==================== Main Content ==================== */
.main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ==================== Hero Section ==================== */
.hero {
  text-align: center;
  margin-bottom: 2rem;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* ==================== Image Preview ==================== */
.preview-section {
  margin-bottom: 2rem;
}

.image-preview {
  position: relative;
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  min-height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: var(--transition);
}

.preview-placeholder {
  text-align: center;
  padding: 2rem;
}

.placeholder-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.preview-placeholder p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.preview-loading {
  text-align: center;
  padding: 2rem;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid var(--bg-tertiary);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

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

.loading-hint {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

.preview-image {
  width: 100%;
  position: relative;
}

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

.prompt-overlay {
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.7);
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.image-actions {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
}

.btn-download, .btn-copy {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-download:hover, .btn-copy:hover {
  background: var(--primary);
  border-color: var(--primary);
}

/* ==================== Generator Form ==================== */
.generator-section {
  margin-bottom: 2rem;
}

.generator-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.input-group {
  margin-bottom: 1.5rem;
}

.input-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.prompt-input {
  width: 100%;
  padding: 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  min-height: 100px;
  transition: var(--transition);
}

.prompt-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.prompt-input::placeholder {
  color: var(--text-muted);
}

.char-counter {
  text-align: right;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.char-counter.warning {
  color: var(--error);
}

.settings-row {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.setting-group {
  flex: 1;
  min-width: 150px;
}

.setting-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.model-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
}

.model-select:focus {
  outline: none;
  border-color: var(--primary);
}

.quality-options {
  display: flex;
  gap: 0.5rem;
}

.quality-btn {
  flex: 1;
  padding: 0.65rem 0.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

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

.quality-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.btn-generate {
  width: 100%;
  padding: 1rem 1.5rem;
  background: var(--gradient);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

.btn-generate:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-generate:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-icon {
  font-size: 1.25rem;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ==================== Suggestions ==================== */
.suggestions-section {
  margin-bottom: 2.5rem;
}

.suggestions-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.chip:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ==================== Features ==================== */
.features-section {
  margin-bottom: 2.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==================== Pricing Preview ==================== */
.pricing-preview {
  margin-bottom: 2rem;
}

.pricing-title {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.pricing-cards {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.pricing-card {
  flex: 1;
  min-width: 200px;
  max-width: 280px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
}

.pricing-badge {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.pricing-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.pricing-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-light);
  margin-bottom: 0.5rem;
}

.pricing-price span {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.pricing-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==================== Footer ==================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  margin-top: auto;
}

.footer-content {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-light);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==================== Toasts ==================== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

.toast-error {
  background: rgba(239, 68, 68, 0.95);
  color: white;
}

.toast-success {
  background: rgba(34, 197, 94, 0.95);
  color: white;
}

.toast-close {
  background: none;
  border: none;
  color: inherit;
  font-size: 1.25rem;
  cursor: pointer;
  opacity: 0.7;
}

.toast-close:hover {
  opacity: 1;
}

/* ==================== Responsive ==================== */
@media (max-width: 640px) {
  .hero-title {
    font-size: 1.75rem;
  }
  
  .hero-subtitle {
    font-size: 0.95rem;
  }
  
  .settings-row {
    flex-direction: column;
    gap: 1rem;
  }
  
  .image-actions {
    flex-direction: column;
  }
  
  .pricing-cards {
    flex-direction: column;
    align-items: center;
  }
  
  .pricing-card {
    max-width: 100%;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 400px) {
  .header-content {
    padding: 0.75rem 1rem;
  }
  
  .logo-text {
    display: none;
  }
  
  .main {
    padding: 1.5rem 1rem;
  }
  
  .generator-form {
    padding: 1rem;
  }
}