/* ═══════════════════════════════════════════════════════════════
   style.css — DataForge: Data Formatter & Column Exporter
   Design tokens, component styles, dark/light theme support
═══════════════════════════════════════════════════════════════ */

/* ── 1. DESIGN TOKENS ──────────────────────────────────────── */
:root {
  /* Brand palette */
  --brand-primary:   #4F8EF7;  /* electric blue  */
  --brand-accent:    #A78BFA;  /* soft violet    */
  --brand-success:   #34D399;  /* mint green     */
  --brand-warning:   #FBBF24;  /* amber          */
  --brand-danger:    #F87171;  /* coral          */

  /* Typography */
  --font-body:   'Inter', system-ui, sans-serif;
  --font-mono:   'JetBrains Mono', 'Cascadia Code', monospace;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;

  /* Radius */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;

  /* Transition */
  --transition: 0.18s ease;

  /* Layout */
  --sidebar-width: 260px;
  --navbar-height: 56px;
}

/* ── 2. DARK THEME (default) ────────────────────────────────── */
[data-bs-theme="dark"] {
  --bg-app:         #0D1117;
  --bg-surface:     #161B22;
  --bg-elevated:    #1C2330;
  --bg-hover:       #21293A;
  --border-color:   #2A3547;
  --text-primary:   #E6EDF3;
  --text-secondary: #8B949E;
  --text-muted:     #5C6B7A;
  --shadow:         0 4px 24px rgba(0,0,0,0.45);
  --shadow-sm:      0 2px 8px  rgba(0,0,0,0.35);

  /* Bootstrap overrides */
  --bs-body-bg:      var(--bg-app);
  --bs-body-color:   var(--text-primary);
  --bs-border-color: var(--border-color);
}

/* ── 3. LIGHT THEME ─────────────────────────────────────────── */
[data-bs-theme="light"] {
  --bg-app:         #F0F4FA;
  --bg-surface:     #FFFFFF;
  --bg-elevated:    #F8FAFD;
  --bg-hover:       #EEF2F9;
  --border-color:   #D8E0EC;
  --text-primary:   #0D1117;
  --text-secondary: #4A5568;
  --text-muted:     #94A3B8;
  --shadow:         0 4px 24px rgba(100,120,180,0.12);
  --shadow-sm:      0 2px 8px  rgba(100,120,180,0.09);

  --bs-body-bg:      var(--bg-app);
  --bs-body-color:   var(--text-primary);
  --bs-border-color: var(--border-color);
}

/* ── 4. GLOBAL RESET / BASE ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html, body {
  height: 100%;
  font-family: var(--font-body);
  font-size: 14px;
  background: var(--bg-app);
  color: var(--text-primary);
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── 5. NAVBAR ──────────────────────────────────────────────── */
.app-navbar {
  height: var(--navbar-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  z-index: 1040;
}

/* Brand */
.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  color: #fff;
}
.brand-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}
.brand-accent { color: var(--brand-primary); }

/* File stats pill */
.file-stats-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 99px;
  padding: 3px 12px;
}

/* Theme toggle */
.theme-toggle {
  width: 34px; height: 34px;
  padding: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: var(--transition);
}
.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--brand-primary);
  border-color: var(--brand-primary);
}

/* Export nav button */
.btn-export {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  border: none;
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 500;
  padding: 5px 14px;
  transition: var(--transition);
}
.btn-export:hover { opacity: 0.85; color: #fff; }

/* ── 6. APP LAYOUT ──────────────────────────────────────────── */
.app-layout {
  display: flex;
  height: calc(100vh - var(--navbar-height));
  overflow: hidden;
}

/* ── 7. SIDEBAR ─────────────────────────────────────────────── */
.app-sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.25s ease;
  z-index: 100;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}
.sidebar-title {
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.sidebar-section {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-color);
}
.sidebar-section:last-child { border-bottom: none; }

.sidebar-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

/* Delimiter grid */
.delimiter-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}
.delim-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 4px 2px;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}
.delim-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--brand-primary);
}
.delim-btn.active {
  background: var(--brand-primary);
  border-color: var(--brand-primary);
  color: #fff;
  font-weight: 600;
}

/* Column list (SortableJS target) */
.column-list {
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-right: 2px;
}

/* Individual column card */
.col-card {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
  cursor: grab;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  user-select: none;
}
.col-card:active { cursor: grabbing; }
.col-card:hover {
  background: var(--bg-hover);
  border-color: var(--brand-primary);
}
.col-card.sortable-ghost {
  opacity: 0.4;
  border: 2px dashed var(--brand-primary);
}
.col-card.sortable-drag {
  box-shadow: var(--shadow);
  border-color: var(--brand-accent);
}

/* Checkbox inside card */
.col-card .form-check-input {
  margin: 0;
  flex-shrink: 0;
  cursor: pointer;
  border-color: var(--border-color);
}
.col-card .form-check-input:checked {
  background-color: var(--brand-primary);
  border-color: var(--brand-primary);
}

.col-card .col-drag-handle {
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-shrink: 0;
}
.col-card .col-name {
  flex: 1;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.col-card .col-badge {
  font-size: 0.6rem;
  padding: 1px 5px;
  border-radius: 99px;
  background: rgba(79,142,247,0.15);
  color: var(--brand-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.col-card .col-rename-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0 2px;
  cursor: pointer;
  font-size: 0.8rem;
  opacity: 0;
  transition: opacity var(--transition);
}
.col-card:hover .col-rename-btn { opacity: 1; }
.col-card .col-rename-btn:hover { color: var(--brand-primary); }

/* Export format grid (sidebar) */
.sidebar-export { flex-shrink: 0; }
.export-format-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  margin-bottom: 0;
}
.export-fmt-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 6px 4px;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.export-fmt-btn:hover {
  background: var(--brand-primary);
  border-color: var(--brand-primary);
  color: #fff;
}

/* ── 8. MAIN CONTENT ────────────────────────────────────────── */
.app-main {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--bg-app);
  position: relative;
}

/* Sidebar open button (mobile) */
.sidebar-open-btn {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  width: 34px; height: 34px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── 9. UPLOAD SECTION ──────────────────────────────────────── */
.upload-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  overflow-y: auto;
}

.drop-zone {
  width: 100%;
  max-width: 600px;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
  background: var(--bg-surface);
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  cursor: pointer;
}
.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--brand-primary);
  background: rgba(79,142,247,0.04);
  box-shadow: 0 0 0 4px rgba(79,142,247,0.08);
}
.drop-zone-inner {
  padding: 48px 40px;
  text-align: center;
  pointer-events: none;
}
.drop-zone-icon {
  font-size: 3rem;
  color: var(--brand-primary);
  margin-bottom: var(--space-4);
  display: block;
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-6px); }
}
.drop-zone-heading {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}
.drop-zone-sub {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}
.btn-upload-pick {
  background: var(--brand-primary);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  padding: 8px 20px;
  cursor: pointer;
  pointer-events: all;
  transition: var(--transition);
}
.btn-upload-pick:hover { background: #3a7aeb; }

/* File chips */
.file-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--space-5);
  max-width: 600px;
  width: 100%;
}
.file-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 6px 12px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  animation: slideIn 0.25s ease;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.file-chip .chip-icon { color: var(--brand-primary); }
.file-chip .chip-size {
  color: var(--text-muted);
  font-size: 0.7rem;
}
.file-chip .chip-records {
  background: rgba(52,211,153,0.12);
  color: var(--brand-success);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 99px;
}

/* ── 10. WORKSPACE SECTION ──────────────────────────────────── */
.workspace-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}

/* Toolbar */
.workspace-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 10px 16px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  flex-shrink: 0;
}

/* Search */
.search-wrap {
  position: relative;
  width: 220px;
}
.search-icon {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.8rem;
  pointer-events: none;
}
.search-input {
  background: var(--bg-elevated);
  border-color: var(--border-color);
  color: var(--text-primary);
  padding-left: 28px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
}
.search-input:focus {
  background: var(--bg-elevated);
  border-color: var(--brand-primary);
  color: var(--text-primary);
  box-shadow: 0 0 0 3px rgba(79,142,247,0.15);
}

/* Stat badges */
.badge-stat {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 99px;
  color: var(--text-secondary);
  padding: 2px 10px;
}

/* Page size select */
.page-size-select {
  background: var(--bg-elevated);
  border-color: var(--border-color);
  color: var(--text-secondary);
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
  width: auto;
}

/* ── 11. DATA TABLE ─────────────────────────────────────────── */
.table-wrapper {
  flex: 1;
  overflow: auto;
  position: relative;
}

.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}
.data-table thead th {
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 8px 12px;
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: 10;
}
.data-table thead th:first-child {
  width: 48px;
  text-align: center;
  color: var(--text-muted);
}
.data-table tbody tr {
  transition: background var(--transition);
}
.data-table tbody tr:hover td {
  background: var(--bg-hover);
}
.data-table tbody td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  vertical-align: middle;
}
.data-table tbody td:first-child {
  color: var(--text-muted);
  font-size: 0.68rem;
  text-align: center;
  user-select: none;
}

/* Highlighted search match */
.match-highlight {
  background: rgba(251,191,36,0.3);
  color: var(--brand-warning);
  border-radius: 2px;
  padding: 0 2px;
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  color: var(--text-muted);
  gap: var(--space-3);
}
.empty-state i { font-size: 2rem; }
.empty-state p { margin: 0; font-size: 0.85rem; }

/* ── 12. PAGINATION ─────────────────────────────────────────── */
.table-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.pagination-info {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* Override Bootstrap pagination for dark/light */
.pagination .page-link {
  background: var(--bg-elevated);
  border-color: var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 3px 9px;
  border-radius: var(--radius-sm) !important;
  margin: 0 1px;
  transition: var(--transition);
}
.pagination .page-link:hover {
  background: var(--bg-hover);
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  z-index: 1;
}
.pagination .page-item.active .page-link {
  background: var(--brand-primary);
  border-color: var(--brand-primary);
  color: #fff;
}
.pagination .page-item.disabled .page-link {
  opacity: 0.35;
  pointer-events: none;
}

/* ── 13. MODAL OVERRIDES ────────────────────────────────────── */
.modal-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
}
.modal-header {
  border-bottom-color: var(--border-color);
  padding: 12px 16px;
}
.modal-footer {
  border-top-color: var(--border-color);
  padding: 10px 16px;
}
.form-control {
  background: var(--bg-elevated);
  border-color: var(--border-color);
  color: var(--text-primary);
}
.form-control:focus {
  background: var(--bg-elevated);
  border-color: var(--brand-primary);
  color: var(--text-primary);
  box-shadow: 0 0 0 3px rgba(79,142,247,0.15);
}

/* ── 14. TOAST NOTIFICATIONS ────────────────────────────────── */
.df-toast {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--brand-primary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  font-size: 0.82rem;
  padding: 10px 14px;
  animation: toastSlide 0.25s ease;
  min-width: 200px;
}
.df-toast.success { border-left-color: var(--brand-success); }
.df-toast.warning { border-left-color: var(--brand-warning); }
.df-toast.error   { border-left-color: var(--brand-danger);  }
@keyframes toastSlide {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ── 15. LOADING OVERLAY ────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13,17,23,0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.loading-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 40px;
  box-shadow: var(--shadow);
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* ── 16. UTILITY CLASSES ────────────────────────────────────── */
.btn-ghost {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}
.btn-icon {
  width: 28px; height: 28px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.btn-icon:hover { color: var(--text-primary); background: var(--bg-hover); }

.btn-xs {
  font-size: 0.68rem;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
}

/* ── 17. RESPONSIVE BREAKPOINTS ─────────────────────────────── */
@media (max-width: 991.98px) {
  .app-sidebar {
    position: fixed;
    left: 0;
    top: var(--navbar-height);
    height: calc(100vh - var(--navbar-height));
    transform: translateX(-100%);
    z-index: 200;
    box-shadow: var(--shadow);
  }
  .app-sidebar.open { transform: translateX(0); }

  .app-main { padding-top: 0; }

  .upload-section { padding: var(--space-4); }
  .drop-zone-inner { padding: 32px 24px; }
}

@media (max-width: 575.98px) {
  :root { --navbar-height: 52px; }
  .brand-name { font-size: 0.9rem; }
  .drop-zone-heading { font-size: 1rem; }
  .workspace-toolbar { gap: var(--space-2); }
  .search-wrap { width: 160px; }
  .file-stats-pill { display: none !important; }
}

/* Sidebar backdrop (mobile) */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 199;
}
.sidebar-backdrop.show { display: block; }