/* ============================================================
   DAX Architect — Stylesheet
   Premium developer-tool design with light/dark mode
   ============================================================ */

/* Fonts: system fallbacks for fully offline operation */

/* ---- Design Tokens ---- */
:root {
  /* Primary palette */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --primary-800: #3730a3;
  --primary-900: #312e81;

  /* Neutrals */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --gray-950: #030712;

  /* Semantic */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  /* Badge colors */
  --badge-measure: #6366f1;
  --badge-calc-col: #0ea5e9;
  --badge-calc-table: #8b5cf6;
  --badge-none: #6b7280;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.08), 0 8px 10px -6px rgba(0,0,0,.04);

  /* Transition */
  --transition-fast: 150ms cubic-bezier(.4,0,.2,1);
  --transition-base: 250ms cubic-bezier(.4,0,.2,1);
  --transition-slow: 350ms cubic-bezier(.4,0,.2,1);

  /* Font */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
}

/* ---- Light Theme (default) ---- */
[data-theme="light"] {
  --bg-canvas: #f0f2f5;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f9fafb;
  --bg-elevated: #ffffff;
  --bg-inset: #f3f4f6;
  --bg-code: #1e1e2e;

  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;
  --text-code: #cdd6f4;

  --border-default: #e5e7eb;
  --border-subtle: #f3f4f6;
  --border-focus: var(--primary-500);

  --input-bg: #ffffff;
  --input-border: #d1d5db;
  --input-hover-border: #9ca3af;

  --header-bg: rgba(255,255,255,.85);
  --header-border: #e5e7eb;

  --scrollbar-thumb: #c7ccd4;
  --scrollbar-track: transparent;
}

/* ---- Dark Theme ---- */
[data-theme="dark"] {
  --bg-canvas: #0f1117;
  --bg-surface: #181a20;
  --bg-surface-hover: #1e2028;
  --bg-elevated: #21232b;
  --bg-inset: #13151b;
  --bg-code: #11111b;

  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;
  --text-inverse: #111827;
  --text-code: #cdd6f4;

  --border-default: #2a2d37;
  --border-subtle: #1e2028;
  --border-focus: var(--primary-400);

  --input-bg: #13151b;
  --input-border: #2a2d37;
  --input-hover-border: #4b5563;

  --header-bg: rgba(15,17,23,.88);
  --header-border: #2a2d37;

  --scrollbar-thumb: #3a3d47;
  --scrollbar-track: transparent;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.25);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.3), 0 2px 4px -2px rgba(0,0,0,.2);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.35), 0 4px 6px -4px rgba(0,0,0,.2);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.4), 0 8px 10px -6px rgba(0,0,0,.2);
}

/* ---- Global Reset ---- */
*, *::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-sans);
  background: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition-base), color var(--transition-base);
  min-height: 100vh;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--gray-500); }

/* ---- Header ---- */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  background: var(--header-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--header-border);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.app-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.app-logo {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.5px;
  box-shadow: 0 2px 8px rgba(99,102,241,.35);
}

.app-title-group {
  display: flex;
  flex-direction: column;
}

.app-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-tagline {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  font-weight: 400;
  margin-top: -2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* (API key input removed — offline engine) */

/* ---- Theme Toggle ---- */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--bg-surface-hover);
  border-color: var(--primary-400);
  color: var(--primary-500);
  transform: rotate(15deg);
}

/* ---- Main Layout ---- */
.app-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--space-xl);
  min-height: calc(100vh - 70px);
}

@media (max-width: 1024px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app-main {
    padding: var(--space-md);
    gap: var(--space-md);
  }
  .app-header {
    padding: var(--space-sm) var(--space-md);
  }
  .api-key-wrapper {
    display: none; /* show a settings button instead on mobile */
  }
}

/* ---- Panel ---- */
.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-sm);
}

.panel-title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-tertiary);
}

/* ---- Card ---- */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

/* ---- Form Elements ---- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.form-label .optional {
  font-weight: 400;
  color: var(--text-tertiary);
  font-size: 0.75rem;
}

.form-input,
.form-select,
.form-textarea {
  padding: 10px 14px;
  font-size: 0.88rem;
  font-family: var(--font-sans);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  width: 100%;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}

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

/* ---- DAX Syntax Hints ---- */
.dax-syntax-hints {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: var(--space-sm);
  padding: 8px 12px;
  background: rgba(88, 166, 255, 0.08);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.75rem;
}

.dax-syntax-hint-title {
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.65rem;
}

.dax-syntax-hint-code {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.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' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
}

.form-input-sm {
  padding: 7px 10px;
  font-size: 0.82rem;
}

/* Number input */
.num-input-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.num-input-group .form-input {
  width: 80px;
  text-align: center;
  font-weight: 600;
}

/* ---- Table Block ---- */
.table-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  animation: slideIn var(--transition-slow) ease-out;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.table-block-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-inset);
  border-bottom: 1px solid var(--border-subtle);
}

.table-block-header .table-index {
  background: var(--primary-600);
  color: white;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.table-block-header .form-input {
  flex: 1;
  font-weight: 600;
  font-size: 0.9rem;
  background: transparent;
  border: 1px solid transparent;
  padding: 6px 10px;
}

.table-block-header .form-input:hover {
  border-color: var(--input-border);
}

.table-block-header .form-input:focus {
  background: var(--input-bg);
  border-color: var(--border-focus);
}

.table-block-body {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
}

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

.column-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  animation: fadeIn var(--transition-fast) ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.column-row .form-input {
  flex: 1;
}

.column-row .form-select {
  width: 200px;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .column-row {
    flex-wrap: wrap;
  }
  .column-row .form-select {
    width: 100%;
  }
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  color: white;
  box-shadow: 0 2px 8px rgba(99,102,241,.3);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 4px 16px rgba(99,102,241,.4);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(99,102,241,.3);
}

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

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--primary-400);
  color: var(--primary-600);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 12px;
}

.btn-ghost:hover {
  background: var(--bg-inset);
  color: var(--primary-600);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-sm);
  font-size: 1rem;
}

.btn-icon.delete-btn {
  color: var(--text-tertiary);
  background: transparent;
  border: 1px solid transparent;
}

.btn-icon.delete-btn:hover {
  color: var(--danger);
  background: rgba(239,68,68,.08);
  border-color: rgba(239,68,68,.2);
}

.btn-add {
  width: 100%;
  padding: 8px;
  border: 1px dashed var(--border-default);
  background: transparent;
  color: var(--text-tertiary);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-add:hover {
  border-color: var(--primary-400);
  color: var(--primary-500);
  background: rgba(99,102,241,.04);
}

.delete-table-btn {
  color: var(--text-tertiary);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  transition: all var(--transition-fast);
  margin-left: auto;
  flex-shrink: 0;
}

.delete-table-btn:hover {
  color: var(--danger);
  background: rgba(239,68,68,.08);
}

/* ---- Generate Button ---- */
.generate-section {
  position: sticky;
  bottom: 0;
  padding: var(--space-md) 0;
  z-index: 10;
}

.btn-generate {
  width: 100%;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.btn-generate::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    transparent,
    rgba(255,255,255,.15),
    transparent
  );
  transform: translateX(-100%);
  transition: transform 600ms ease;
}

.btn-generate:hover:not(:disabled)::before {
  transform: translateX(100%);
}

.btn-generate .spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.btn-generate.loading .spinner {
  display: inline-block;
}

.btn-generate.loading .btn-text {
  display: none;
}

.btn-generate .loading-text {
  display: none;
}

.btn-generate.loading .loading-text {
  display: inline;
}

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

/* ---- Load Example Link ---- */
.load-example-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--primary-500);
  cursor: pointer;
  font-weight: 500;
  transition: color var(--transition-fast);
  background: none;
  border: none;
  font-family: var(--font-sans);
  padding: 0;
}

.load-example-link:hover {
  color: var(--primary-700);
}

/* ---- Relationships Section ---- */
.collapsible {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-surface);
}

.collapsible-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.collapsible-trigger:hover {
  color: var(--text-primary);
}

.collapsible-trigger .chevron {
  transition: transform var(--transition-fast);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.collapsible.open .collapsible-trigger .chevron {
  transform: rotate(180deg);
}

.collapsible-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
  padding: 0 var(--space-lg);
}

.collapsible.open .collapsible-content {
  max-height: 500px;
  padding: 0 var(--space-lg) var(--space-lg);
}

/* ---- Results Panel ---- */
.results-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  min-height: 400px;
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-lg);
  background: var(--bg-surface);
}

.results-empty-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  opacity: 0.3;
}

.results-empty-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.results-empty-desc {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  max-width: 300px;
  line-height: 1.5;
}

/* ---- Loading Shimmer ---- */
.shimmer-container {
  display: none;
  flex-direction: column;
  gap: var(--space-md);
}

.shimmer-container.active {
  display: flex;
}

.shimmer-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  overflow: hidden;
}

.shimmer-line {
  height: 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(
    90deg,
    var(--bg-inset) 25%,
    var(--bg-surface-hover) 50%,
    var(--bg-inset) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

.shimmer-line.w-60 { width: 60%; }
.shimmer-line.w-80 { width: 80%; }
.shimmer-line.w-40 { width: 40%; }
.shimmer-line.w-100 { width: 100%; height: 60px; }

.shimmer-line + .shimmer-line {
  margin-top: var(--space-sm);
}

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

.loading-status {
  text-align: center;
  padding: var(--space-md);
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.loading-status .dot-anim {
  display: inline-flex;
  gap: 2px;
  margin-left: 2px;
}

.loading-status .dot-anim span {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-tertiary);
  animation: dotPulse 1.4s ease-in-out infinite;
}

.loading-status .dot-anim span:nth-child(2) { animation-delay: 0.2s; }
.loading-status .dot-anim span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dotPulse {
  0%, 80%, 100% { opacity: 0.2; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1.2); }
}

/* ---- Result Cards ---- */
.results-content {
  display: none;
  flex-direction: column;
  gap: var(--space-lg);
  animation: fadeInUp var(--transition-slow) ease-out;
}

.results-content.active {
  display: flex;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Goal card */
.goal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.goal-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.goal-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Notes callout */
.notes-callout {
  background: rgba(245,158,11,.06);
  border: 1px solid rgba(245,158,11,.2);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-top: var(--space-md);
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.notes-callout .callout-icon {
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.notes-callout .callout-text {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.notes-callout .callout-label {
  font-weight: 600;
  color: var(--warning);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

/* Resolved-columns (disambiguation) card */
.resolved-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
}

.resolved-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.resolved-hint {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--text-tertiary);
}

.resolved-rows {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.resolved-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.resolved-role {
  min-width: 130px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.resolved-arrow {
  color: var(--text-tertiary);
}

.resolved-select {
  flex: 1;
  max-width: 280px;
  font-family: var(--font-mono, monospace);
  font-size: 0.78rem;
}

/* Requires banner */
.requires-banner {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
}

.requires-banner.yes {
  background: rgba(16,185,129,.08);
  border: 1px solid rgba(16,185,129,.2);
  color: var(--success);
}

.requires-banner.no {
  background: rgba(99,102,241,.06);
  border: 1px solid rgba(99,102,241,.15);
  color: var(--primary-500);
}

/* Step card */
.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
  animation: fadeInUp var(--transition-slow) ease-out;
  animation-fill-mode: backwards;
}

.step-card:hover {
  box-shadow: var(--shadow-md);
}

.step-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.step-number {
  background: var(--bg-inset);
  color: var(--text-tertiary);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
  flex: 1;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 100px;
  white-space: nowrap;
}

.badge-measure {
  background: rgba(99,102,241,.1);
  color: var(--badge-measure);
}

.badge-calc-col {
  background: rgba(14,165,233,.1);
  color: var(--badge-calc-col);
}

.badge-calc-table {
  background: rgba(139,92,246,.1);
  color: var(--badge-calc-table);
}

.badge-none {
  background: rgba(107,114,128,.1);
  color: var(--badge-none);
}

.badge-new {
  background: rgba(16,185,129,.1);
  color: var(--success);
  font-size: 0.65rem;
}

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

.step-object-name {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary-500);
  margin-bottom: var(--space-sm);
}

.step-reason {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-md);
}

/* Dependency chips */
.depends-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.depends-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.depends-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  font-family: var(--font-mono);
  background: var(--bg-inset);
  border: 1px solid var(--border-default);
  border-radius: 100px;
  color: var(--text-secondary);
}

/* DAX Code Block */
.dax-code-wrapper {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-code);
}

.dax-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: rgba(255,255,255,.04);
  border-bottom: 1px solid rgba(255,255,255,.06);
}

.dax-code-lang {
  font-size: 0.7rem;
  font-weight: 600;
  color: rgba(205,214,244,.4);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-family: var(--font-mono);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: rgba(205,214,244,.5);
  background: transparent;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  color: rgba(205,214,244,.9);
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.15);
}

.copy-btn.copied {
  color: var(--success);
  border-color: rgba(16,185,129,.3);
}

.dax-code-block {
  padding: var(--space-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-code);
}

.dax-code-block pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

/* DAX Syntax Highlighting (Catppuccin Mocha inspired) */
.dax-keyword   { color: #cba6f7; font-weight: 500; }  /* purple */
.dax-function  { color: #89b4fa; font-weight: 500; }  /* blue */
.dax-string    { color: #a6e3a1; }                      /* green */
.dax-number    { color: #fab387; }                      /* peach */
.dax-comment   { color: #6c7086; font-style: italic; }  /* overlay0 */
.dax-operator  { color: #89dceb; }                      /* sky */
.dax-table-ref { color: #f9e2af; }                      /* yellow */
.dax-column-ref{ color: #f9e2af; }                      /* yellow */
.dax-measure-ref { color: #f5c2e7; }                    /* pink */

/* ---- Final Answer Card ---- */
.final-card {
  background: var(--bg-surface);
  border: 2px solid var(--primary-500);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 0 0 4px rgba(99,102,241,.08), var(--shadow-lg);
}

.final-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, rgba(99,102,241,.06), rgba(139,92,246,.06));
  border-bottom: 1px solid var(--border-subtle);
}

.final-card-header h3 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--primary-600);
}

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

.final-object-name {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--primary-500);
  margin-bottom: var(--space-md);
}

.usage-tip {
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: rgba(99,102,241,.04);
  border-radius: var(--radius-md);
  border: 1px solid rgba(99,102,241,.1);
}

.usage-tip-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary-500);
  margin-bottom: var(--space-xs);
}

.usage-tip-text {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ---- Copy All Button ---- */
.copy-all-section {
  display: flex;
  justify-content: flex-end;
}

.btn-copy-all {
  padding: 10px 24px;
  font-size: 0.85rem;
}

/* ---- Error State ---- */
.error-card {
  background: var(--bg-surface);
  border: 1px solid rgba(239,68,68,.25);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  display: none;
}

.error-card.active {
  display: block;
  animation: fadeInUp var(--transition-slow) ease-out;
}

.error-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

.error-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--danger);
  margin-bottom: var(--space-sm);
}

.error-message {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.5;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.error-raw {
  background: var(--bg-code);
  color: var(--text-code);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-align: left;
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: var(--space-lg);
  white-space: pre-wrap;
  word-break: break-word;
}

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

.flex-gap-sm { display: flex; gap: var(--space-sm); align-items: center; }
.flex-gap-md { display: flex; gap: var(--space-md); align-items: center; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }

/* ---- Mobile Adjustments ---- */
@media (max-width: 640px) {
  .step-card-header {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }
  .badge {
    font-size: 0.65rem;
  }
  .dax-code-block {
    font-size: 0.76rem;
  }
  .app-logo {
    width: 32px;
    height: 32px;
    font-size: 12px;
  }
  .app-title {
    font-size: 1rem;
  }
}

/* ---- Offline Badge ---- */
.offline-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 14px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--success);
  background: rgba(16,185,129,.08);
  border: 1px solid rgba(16,185,129,.2);
  border-radius: 100px;
  letter-spacing: 0.3px;
  white-space: nowrap;
}

/* ---- Hint Chips ---- */
.hint-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--space-sm);
}

.hint-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-tertiary);
  background: var(--bg-inset);
  border: 1px solid var(--border-default);
  border-radius: 100px;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.hint-chip:hover {
  color: var(--primary-500);
  border-color: var(--primary-400);
  background: rgba(99,102,241,.06);
  transform: translateY(-1px);
}

.hint-chip:active {
  transform: translateY(0);
}

/* ---- Patterns Grid ---- */
.patterns-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
  margin-top: var(--space-sm);
}

.pattern-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-inset);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all 0.2s ease;
}

.pattern-item:hover {
  background: var(--bg-hover);
  color: var(--text-main);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.pattern-icon {
  font-size: 0.9rem;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .patterns-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Relationship Builder ---- */
.relationships-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.rel-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  background: var(--bg-inset);
  padding: 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* Inactive relationships render dashed, like Power BI */
.rel-row.rel-inactive {
  border-style: dashed;
  border-color: var(--text-tertiary);
}

.rel-arrow {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  font-weight: bold;
}

.rel-select {
  flex: 1;
  min-width: 120px;
}

/* ---- DAG Visualization ---- */
.dag-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  animation: fadeIn 0.4s ease-out;
}

.dag-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

.dag-card-header span {
  font-size: 1.2rem;
}

.dag-canvas-wrapper {
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  min-height: 120px;
}

.dag-canvas-wrapper svg {
  display: block;
  margin: 0 auto;
}

.dag-node {
  cursor: default;
}

.dag-node rect {
  fill: var(--bg-inset);
  stroke: var(--border-default);
  stroke-width: 1.5;
  rx: 8;
  ry: 8;
  transition: all 0.2s ease;
}

.dag-node:hover rect {
  stroke: var(--accent);
  stroke-width: 2;
  filter: drop-shadow(0 2px 6px rgba(99, 102, 241, 0.2));
}

.dag-node text {
  fill: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}

.dag-node-badge {
  fill: var(--accent);
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}

.dag-edge line {
  stroke: var(--text-tertiary);
  stroke-width: 1.5;
}

.dag-edge polygon {
  fill: var(--text-tertiary);
}

[data-theme="dark"] .dag-node rect {
  fill: rgba(255, 255, 255, 0.06);
  stroke: rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .dag-edge line {
  stroke: rgba(255, 255, 255, 0.3);
}

[data-theme="dark"] .dag-edge polygon {
  fill: rgba(255, 255, 255, 0.3);
}

/* ============================================================
   TIER 2 / TIER 3 ADDITIONS
   ============================================================ */

/* Define the previously-undefined --accent (used by DAG + notes) */
:root { --accent: var(--primary-500); }
[data-theme="dark"] { --accent: var(--primary-400); }

/* Header: lint button */
.header-btn {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}
.header-btn:hover { background: var(--bg-surface-hover); color: var(--primary-500); }

.panel-header-actions { display: flex; gap: var(--space-sm); flex-wrap: wrap; }

/* Metadata badges on step cards */
.badge-folder { background: rgba(139,92,246,.12); color: #7c3aed; text-transform: none; letter-spacing: 0; font-weight: 600; }
.badge-format { background: rgba(107,114,128,.12); color: var(--text-secondary); text-transform: none; letter-spacing: 0; font-weight: 600; font-family: var(--font-mono); }
[data-theme="dark"] .badge-folder { color: #c4b5fd; }

/* Export bar */
.export-bar {
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-inset);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}
.export-bar-label { font-size: 0.8rem; font-weight: 700; color: var(--text-secondary); margin-bottom: var(--space-sm); }
.export-bar-btns { display: flex; flex-wrap: wrap; gap: var(--space-sm); }

/* Interactive DAG */
.dag-hint { font-size: 0.72rem; color: var(--text-tertiary); margin: 2px 0 var(--space-sm); }
.dag-node { cursor: pointer; }
.dag-node rect, .dag-edge line, .dag-edge polygon { transition: opacity 0.15s ease, stroke 0.15s ease; }
svg.dag-focus .dag-node:not(.dag-hi) { opacity: 0.28; }
svg.dag-focus .dag-edge:not(.dag-hi) { opacity: 0.1; }
.dag-node.dag-hi rect { stroke: var(--accent); stroke-width: 2.5; }
.dag-edge.dag-hi line { stroke: var(--accent); stroke-width: 2.5; }
.dag-edge.dag-hi polygon { fill: var(--accent); }

/* Flash a step card when its DAG node is clicked */
.step-flash { animation: stepFlash 1.3s ease; }
@keyframes stepFlash {
  0%, 100% { box-shadow: var(--shadow-sm); }
  15%, 55% { box-shadow: 0 0 0 3px var(--accent); }
}

/* Modal (import / lint) */
.modal-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(0,0,0,.45);
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-lg);
}
.modal {
  width: 640px; max-width: 100%; max-height: 88vh;
  display: flex; flex-direction: column;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  font-weight: 700;
  border-bottom: 1px solid var(--border-subtle);
}
.modal-close { border: none; background: none; font-size: 1rem; cursor: pointer; color: var(--text-tertiary); }
.modal-close:hover { color: var(--text-primary); }
.modal-body { padding: var(--space-lg); overflow: auto; }
.modal-desc { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: var(--space-sm); }
.modal-code {
  background: var(--bg-inset); border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md); font-family: var(--font-mono);
  font-size: 0.75rem; color: var(--text-secondary); margin-bottom: var(--space-md);
  white-space: pre; overflow-x: auto;
}
.modal-footer { display: flex; align-items: center; justify-content: flex-end; gap: var(--space-md); margin-top: var(--space-md); }
.modal-msg { font-size: 0.78rem; color: #b45309; margin-right: auto; }
.form-textarea.code { font-family: var(--font-mono); font-size: 0.8rem; }

/* Lint findings */
.lint-results { margin-top: var(--space-md); display: flex; flex-direction: column; gap: var(--space-sm); }
.lint-item { display: flex; gap: var(--space-sm); padding: var(--space-sm) var(--space-md); border-radius: var(--radius-sm); background: var(--bg-inset); border-left: 3px solid var(--border-default); }
.lint-warning { border-left-color: #f59e0b; }
.lint-info { border-left-color: var(--primary-500); }
.lint-ok { border-left-color: #10b981; }
.lint-icon { flex-shrink: 0; }
.lint-text { font-size: 0.82rem; color: var(--text-secondary); }
.lint-rule { display: inline-block; font-weight: 700; color: var(--text-primary); margin-right: var(--space-sm); }
.lint-line { display: inline-block; font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-tertiary); }