/* ===================================================
   LLM WikiZZ — Premium Dark UI
   =================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Design Tokens --- */
:root {
  /* Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --bg-input: #1a1a26;
  --bg-glass: rgba(22, 22, 31, 0.7);

  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.1);
  --border-focus: rgba(139, 92, 246, 0.5);

  --text-primary: #f0f0f5;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-accent: #c4b5fd;

  /* Accent Gradients */
  --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #6366f1 50%, #4f46e5 100%);
  --gradient-warm: linear-gradient(135deg, #f97316 0%, #ef4444 100%);
  --gradient-cyan: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-emerald: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-verdict: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);

  /* Surfaces */
  --surface-plain: linear-gradient(145deg, rgba(99, 102, 241, 0.08) 0%, rgba(79, 70, 229, 0.03) 100%);
  --surface-wikizz: linear-gradient(145deg, rgba(16, 185, 129, 0.08) 0%, rgba(5, 150, 105, 0.03) 100%);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.15);

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

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

/* Animated background mesh */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 80% 50% at 20% 20%, rgba(139, 92, 246, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(99, 102, 241, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 50% 50%, rgba(16, 185, 129, 0.03) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* --- Layout --- */
.app-wrapper {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

/* --- Header --- */
.app-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  padding: var(--space-2xl) 0;
}

.logo-wrapper {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.logo-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-glow);
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.logo-text {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
}

.logo-text span {
  background: var(--gradient-emerald);
  -webkit-background-clip: text;
  background-clip: text;
}

.tagline {
  color: var(--text-secondary);
  font-size: 1.05rem;
  font-weight: 400;
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

.tagline strong {
  color: var(--text-accent);
  font-weight: 600;
}

/* --- Steps / Cards --- */
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.step-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-sm);
}

.step-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.step-number {
  width: 28px;
  height: 28px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.12);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239ca3af' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.9rem center;
  padding-right: 2.2rem;
}

.form-select option {
  background: var(--bg-card);
  color: var(--text-primary);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  font-family: var(--font-sans);
}

/* Password input container */
.password-wrapper {
  display: flex;
  gap: var(--space-xs);
}

.password-wrapper .form-input {
  flex: 1;
}

.password-toggle, .test-key-btn {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  padding: 0 0.8rem;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.password-toggle:hover, .test-key-btn:hover {
  border-color: var(--border-focus);
  color: var(--text-secondary);
  background: var(--bg-card-hover);
}

.test-key-btn {
  font-weight: 600;
  min-width: 80px;
}

/* --- Upload Zone --- */
.upload-zone {
  border: 2px dashed var(--border-medium);
  border-radius: var(--radius-md);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: rgba(139, 92, 246, 0.4);
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
  opacity: 0.04;
}

.upload-zone-content {
  position: relative;
  z-index: 1;
}

.upload-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
  opacity: 0.7;
}

.upload-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.upload-text strong {
  color: var(--text-accent);
}

.upload-hint {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: var(--space-xs);
}

.upload-input {
  display: none;
}

/* Upload success state */
.upload-success {
  display: none;
  padding: var(--space-lg);
  background: rgba(16, 185, 129, 0.06);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--radius-md);
}

.upload-success.visible {
  display: block;
  animation: slideIn 0.3s ease-out;
}

.upload-filename {
  font-weight: 600;
  color: #10b981;
  font-size: 0.95rem;
  margin-bottom: var(--space-xs);
}

.upload-meta {
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-bottom: var(--space-sm);
}

.upload-preview {
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  line-height: 1.5;
  max-height: 120px;
  overflow-y: auto;
  display: none;
}

.upload-preview.visible {
  display: block;
}

.preview-toggle {
  background: none;
  border: none;
  color: var(--text-accent);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0;
  margin-top: var(--space-xs);
  font-family: var(--font-sans);
}

.preview-toggle:hover {
  text-decoration: underline;
}

.upload-change-btn {
  background: none;
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
  margin-top: var(--space-sm);
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.upload-change-btn:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
}

/* --- 5W1H Section --- */
.wikizz-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--bg-input);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  cursor: pointer;
  transition: all var(--transition-base);
  flex-shrink: 0;
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition-base);
}

.toggle-switch.active {
  background: rgba(139, 92, 246, 0.3);
  border-color: rgba(139, 92, 246, 0.5);
}

.toggle-switch.active::after {
  left: 22px;
  background: #8b5cf6;
}

.wikizz-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  transition: all var(--transition-slow);
}

.wikizz-fields.collapsed {
  display: none;
}

.wikizz-field-icon {
  display: inline-flex;
  width: 22px;
  height: 22px;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-size: 0.7rem;
  margin-right: var(--space-xs);
  vertical-align: middle;
}

.icon-who { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.icon-what { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.icon-when { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.icon-where { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.icon-why { background: rgba(168, 85, 247, 0.15); color: #c084fc; }
.icon-how { background: rgba(6, 182, 212, 0.15); color: #22d3ee; }

/* --- Query Section --- */
.query-textarea {
  min-height: 80px;
}

/* --- Primary Button --- */
.btn-primary {
  width: 100%;
  padding: 0.9rem 2rem;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  margin-top: var(--space-sm);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn-primary:hover:not(:disabled)::before {
  opacity: 1;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
}

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* --- Loading / Running State --- */
.btn-loading .btn-text {
  opacity: 0;
}

.btn-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 22px;
  height: 22px;
  margin: -11px 0 0 -11px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* --- Results Section --- */
.results-section {
  display: none;
  animation: slideIn 0.5s ease-out;
}

.results-section.visible {
  display: block;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.result-column {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base);
}

.result-column:hover {
  border-color: var(--border-medium);
}

.result-column.plain {
  background: var(--surface-plain);
}

.result-column.wikizz {
  background: var(--surface-wikizz);
}

.result-column-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-column-title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.plain .result-column-title {
  color: #818cf8;
}

.wikizz .result-column-title {
  color: #34d399;
}

.result-badge {
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: 99px;
  font-weight: 500;
}

.plain .result-badge {
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
}

.wikizz .result-badge {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
}

.result-body {
  padding: var(--space-lg);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 200px;
}

.result-footer {
  padding: var(--space-sm) var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.result-metrics {
  display: flex;
  gap: var(--space-md);
}

.metric {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.metric-icon {
  font-size: 0.8rem;
}

.copy-btn {
  background: none;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.copy-btn:hover {
  border-color: var(--border-medium);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
}

/* --- Verdict Card --- */
.verdict-card {
  background: var(--bg-card);
  border: 1px solid rgba(251, 191, 36, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.verdict-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-verdict);
}

.verdict-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.verdict-icon {
  font-size: 1.4rem;
}

.verdict-title {
  font-size: 1rem;
  font-weight: 600;
  color: #fbbf24;
}

.verdict-summary {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.verdict-improvements {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.verdict-improvements li {
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.15);
  padding: 0.35rem 0.75rem;
  border-radius: 99px;
  font-size: 0.8rem;
  color: #fbbf24;
}

/* --- Run Again --- */
.run-again-row {
  text-align: center;
  margin-top: var(--space-lg);
}

.btn-secondary {
  padding: 0.7rem 1.8rem;
  background: transparent;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-secondary:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
}

/* --- Error Banner --- */
.error-banner {
  display: none;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-lg);
  color: #f87171;
  font-size: 0.9rem;
  align-items: center;
  gap: var(--space-sm);
}

.error-banner.visible {
  display: flex;
  animation: slideIn 0.3s ease-out;
}

.error-banner-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

.error-banner-text {
  flex: 1;
}

.error-dismiss {
  background: none;
  border: none;
  color: #f87171;
  cursor: pointer;
  font-size: 1.2rem;
  padding: 0.25rem;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.error-dismiss:hover {
  opacity: 1;
}

/* --- Skeleton Loader --- */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-input) 0%,
    rgba(139, 92, 246, 0.06) 50%,
    var(--bg-input) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton-line {
  height: 14px;
  margin-bottom: var(--space-sm);
  border-radius: 4px;
}

.skeleton-line:nth-child(2) { width: 85%; }
.skeleton-line:nth-child(3) { width: 70%; }
.skeleton-line:nth-child(4) { width: 90%; }
.skeleton-line:nth-child(5) { width: 60%; }

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

/* --- Uploading spinner --- */
.upload-spinner {
  display: none;
  text-align: center;
  padding: var(--space-xl);
}

.upload-spinner.visible {
  display: block;
}

.upload-spinner-circle {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-subtle);
  border-top-color: #8b5cf6;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--space-sm);
}

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

/* --- Truncation Warning --- */
.truncation-warning {
  display: none;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.8rem;
  color: #fbbf24;
  margin-top: var(--space-sm);
}

.truncation-warning.visible {
  display: block;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .app-wrapper {
    padding: var(--space-md);
  }

  .logo-text {
    font-size: 1.6rem;
  }

  .tagline {
    font-size: 0.9rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .wikizz-fields {
    grid-template-columns: 1fr;
  }

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

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

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* --- Utility --- */
.hidden {
  display: none !important;
}

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