/* =====================================================
   diffli — Styles
   ===================================================== */

/* --- CSS Variables / Theming --- */
:root {
  --bg: #f5f5f5;
  --bg-card: #ffffff;
  --bg-card-alt: #fafafa;
  --text: #1a1a1a;
  --text-secondary: #666;
  --border: #d0d0d0;
  --border-light: #e8e8e8;
  --accent: #0964b0;
  --accent-hover: #07509e;
  --added-bg: #d4edda;
  --added-text: #155724;
  --deleted-bg: #f8d7da;
  --deleted-text: #721c24;
  --changed-bg: #fff3cd;
  --changed-text: #856404;
  --equal-bg: transparent;
  --hdr-bg: #e8f4fd;
  --key-color: #f0ad4e;
  --key-bg: #fff8e1;
  --header-bg: #f0f0f0;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --radius: 8px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

[data-theme="dark"] {
  --bg: #121212;
  --bg-card: #1e1e1e;
  --bg-card-alt: #252525;
  --text: #e0e0e0;
  --text-secondary: #999;
  --border: #3a3a3a;
  --border-light: #2a2a2a;
  --accent: #4a9eff;
  --accent-hover: #3a8aef;
  --added-bg: #1a3a1a;
  --added-text: #8bc88b;
  --deleted-bg: #3a1a1a;
  --deleted-text: #d88;
  --changed-bg: #3a3a1a;
  --changed-text: #e8c84a;
  --equal-bg: transparent;
  --hdr-bg: #1a2a3a;
  --key-color: #ffb347;
  --key-bg: #2a2a10;
  --header-bg: #2a2a2a;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
}

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

html {
  font-size: 14px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* --- Header --- */
.app-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.app-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-header h1 small {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-left: 4px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-actions button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text);
  transition: all 0.15s;
}

.header-actions button:hover {
  background: var(--bg-card-alt);
  border-color: var(--accent);
}

/* --- Main Container --- */
.app-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
}

/* --- Description --- */
.app-desc {
  text-align: center;
  margin-bottom: 28px;
  color: var(--text-secondary);
  font-size: 1rem;
}

.app-desc strong {
  color: var(--accent);
}

/* --- File Panels --- */
.file-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

.file-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}

.file-panel h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.file-panel h2 .file-name {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text);
  font-size: 0.85rem;
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-panel h2 .file-name.has-file {
  color: var(--accent);
  font-weight: 600;
}

.file-actions {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.file-actions button,
.file-actions .file-input-trigger {
  background: var(--bg-card-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--text);
  transition: all 0.15s;
  font-family: var(--font);
}

.file-actions button:hover,
.file-actions .file-input-trigger:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.file-actions .btn-clear {
  color: var(--deleted-text);
  display: none;
}

.file-actions .btn-clear:hover {
  background: var(--deleted-bg);
  border-color: var(--deleted-text);
}

/* --- Sheet Select --- */
.sheet-select {
  font-size: 0.8rem;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-card);
  color: var(--text);
  margin-bottom: 10px;
  display: none;
}

/* --- Data Grid --- */
.data-grid-wrap {
  max-height: 400px;
  overflow: auto;
  border: 1px solid var(--border-light);
  border-radius: 6px;
}

.data-grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.data-grid th,
.data-grid td {
  border: 1px solid var(--border-light);
  padding: 4px 8px;
  text-align: left;
  white-space: nowrap;
}

.data-grid thead th {
  background: var(--header-bg);
  position: sticky;
  top: 0;
  z-index: 2;
  font-weight: 600;
  font-family: var(--font);
  font-size: 0.75rem;
  cursor: pointer;
  user-select: none;
}

.data-grid thead th:hover {
  background: var(--key-bg);
}

.grid-col-hdr.key-active {
  background: var(--key-bg);
  color: var(--key-color);
}

.key-marker {
  cursor: pointer;
  font-size: 0.85rem;
  margin-right: 4px;
  display: inline-block;
  transition: transform 0.15s;
}

.key-marker:hover {
  transform: scale(1.3);
}

.grid-row-marker {
  cursor: pointer;
  text-align: center;
  font-size: 0.65rem;
  font-weight: 700;
  width: 32px;
  min-width: 32px;
  background: var(--header-bg);
  user-select: none;
  color: var(--text-secondary);
}

.grid-row-marker.hdr-active {
  background: var(--hdr-bg);
  color: var(--accent);
}

.grid-row-marker:hover {
  background: var(--hdr-bg);
}

.header-row {
  background: var(--hdr-bg);
  font-weight: 600;
}

.grid-cell {
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.empty-grid {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- Paste Area --- */
.paste-area {
  display: none;
  margin-bottom: 10px;
}

.paste-area textarea {
  width: 100%;
  height: 120px;
  padding: 10px;
  border: 2px dashed var(--border);
  border-radius: 6px;
  background: var(--bg-card-alt);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}

.paste-area textarea:focus {
  border-color: var(--accent);
}

.paste-actions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.paste-actions button {
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 0.8rem;
  background: var(--bg-card-alt);
  color: var(--text);
  transition: all 0.15s;
}

.paste-actions .btn-confirm {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.paste-actions .btn-confirm:hover {
  background: var(--accent-hover);
}

/* --- Compare Button --- */
.compare-section {
  text-align: center;
  margin-bottom: 28px;
}

#compareBtn {
  padding: 12px 48px;
  font-size: 1.1rem;
  font-weight: 700;
  border: none;
  border-radius: 8px;
  background: var(--border-light);
  color: var(--text-secondary);
  cursor: not-allowed;
  transition: all 0.2s;
  font-family: var(--font);
  letter-spacing: 0.3px;
}

#compareBtn.ready {
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(9, 100, 176, 0.3);
}

#compareBtn.ready:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(9, 100, 176, 0.4);
}

#compareBtn.ready:active {
  transform: translateY(0);
}

.compare-hint {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* --- Report Area --- */
.report-area {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

/* Legend */
.report-legend {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
}

.legend-item {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: all 0.15s;
  user-select: none;
  background: var(--bg-card-alt);
  color: var(--text);
}

.legend-item:hover {
  border-color: var(--accent);
}

.legend-item.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.legend-item .badge {
  display: inline-block;
  min-width: 18px;
  height: 18px;
  line-height: 18px;
  text-align: center;
  border-radius: 9px;
  background: rgba(0,0,0,0.1);
  font-size: 0.7rem;
  font-weight: 700;
  margin-left: 4px;
  padding: 0 4px;
}

.legend-item.active .badge {
  background: rgba(255,255,255,0.25);
}

.legend-added { border-left: 3px solid #28a745; }
.legend-deleted { border-left: 3px solid #dc3545; }
.legend-changed { border-left: 3px solid #ffc107; }
.legend-equal { border-left: 3px solid #6c757d; }
.legend-header { border-left: 3px solid var(--accent); }

.legend-spacer {
  flex: 1;
  min-width: 8px;
}

/* View toggle */
.legend-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.toggle-option {
  padding: 4px 12px;
  font-size: 0.8rem;
  cursor: pointer;
  background: var(--bg-card-alt);
  color: var(--text);
  transition: all 0.15s;
  user-select: none;
}

.toggle-option.active {
  background: var(--accent);
  color: #fff;
}

.toggle-option:not(.active):hover {
  background: var(--header-bg);
}

/* Report action buttons */
.report-btn {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card-alt);
  color: var(--text);
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.15s;
  font-family: var(--font);
}

.report-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* --- Diff Tables --- */
.report-tables {
  overflow: auto;
}

.side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.ss-panel h3 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  padding-left: 4px;
}

.ss-table-wrap {
  overflow: auto;
  max-height: 500px;
}

.diff-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.diff-table th,
.diff-table td {
  border: 1px solid var(--border-light);
  padding: 5px 8px;
  text-align: left;
  white-space: nowrap;
}

.diff-table thead th {
  background: var(--header-bg);
  position: sticky;
  top: 0;
  z-index: 2;
  font-weight: 600;
  font-family: var(--font);
  font-size: 0.75rem;
}

.diff-table .row-num {
  width: 36px;
  min-width: 36px;
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-secondary);
  background: var(--header-bg);
}

/* Row type colors */
.diff-row.added {
  background: var(--added-bg);
}

.diff-row.added .row-num {
  color: var(--added-text);
}

.diff-row.deleted {
  background: var(--deleted-bg);
}

.diff-row.deleted .row-num {
  color: var(--deleted-text);
}

.diff-row.changed {
  background: var(--changed-bg);
}

.diff-row.changed .row-num {
  color: var(--changed-text);
}

.diff-row.header {
  background: var(--hdr-bg);
  font-weight: 600;
}

/* Cell status */
.cell-changed {
  font-weight: 700;
  color: var(--changed-text);
}

.cell-added {
  color: var(--added-text);
}

.cell-deleted {
  color: var(--deleted-text);
}

.cell-equal {
  color: var(--text);
}

/* Consolidated */
.consolidated-table .consolidated-cell {
  white-space: nowrap;
}

.consolidated-cell .val-a {
  color: var(--added-text);
}

.consolidated-cell .val-sep {
  color: var(--text-secondary);
  margin: 0 4px;
  font-size: 0.7rem;
}

.consolidated-cell .val-b {
  color: var(--deleted-text);
}

/* --- Drop Overlay --- */
.drop-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(9, 100, 176, 0.9);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
}

.drop-overlay .drop-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

/* --- Toast --- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 10px 24px;
  border-radius: 8px;
  background: var(--text);
  color: var(--bg);
  font-size: 0.85rem;
  opacity: 0;
  transition: all 0.3s;
  z-index: 9998;
  pointer-events: none;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --- Footer --- */
.app-footer {
  text-align: center;
  padding: 20px 24px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-light);
}

.app-footer a {
  color: var(--accent);
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .file-panels {
    grid-template-columns: 1fr;
  }

  .side-by-side {
    grid-template-columns: 1fr;
  }

  .report-legend {
    gap: 4px;
  }

  .legend-item {
    padding: 3px 8px;
    font-size: 0.75rem;
  }

  .app-main {
    padding: 12px;
  }

  .app-header h1 {
    font-size: 1.1rem;
  }
}

@media (max-width: 600px) {
  .report-legend {
    flex-direction: column;
    align-items: stretch;
  }

  .legend-spacer {
    display: none;
  }

  .legend-toggle {
    align-self: flex-start;
  }
}

/* --- Scrollbar Styling --- */
.data-grid-wrap::-webkit-scrollbar,
.ss-table-wrap::-webkit-scrollbar,
.report-tables::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.data-grid-wrap::-webkit-scrollbar-track,
.ss-table-wrap::-webkit-scrollbar-track,
.report-tables::-webkit-scrollbar-track {
  background: var(--bg-card-alt);
}

.data-grid-wrap::-webkit-scrollbar-thumb,
.ss-table-wrap::-webkit-scrollbar-thumb,
.report-tables::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.data-grid-wrap::-webkit-scrollbar-thumb:hover,
.ss-table-wrap::-webkit-scrollbar-thumb:hover,
.report-tables::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* --- Selection Colors --- */
::selection {
  background: var(--accent);
  color: #fff;
}