/* ── Text Compare Tool ───────────────────────────────────────────────────────
   Split / inline diff editor with syntax-aware highlighting, merge editor,
   readability stats, word-frequency analysis, and history panel.
   All classes use the tc- prefix.
   ─────────────────────────────────────────────────────────────────────────── */

/* ═══════════════════════════════════════════════════════════════════════════
   ROOT WRAP
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-wrap {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    width: 100%;
}

/* ═══════════════════════════════════════════════════════════════════════════
   TOOLBAR
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-toolbar {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.tc-toolbar-row1,
.tc-toolbar-row2 {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
}

/* Option group (label + button cluster) */
.tc-opt-group {
    display: inline-flex;
    align-items: center;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
}

.tc-opt-btn {
    padding: 6px 12px;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
    font-family: var(--font-body);
    line-height: 1;
    letter-spacing: 0.03em;
}

.tc-opt-btn:not(:last-child) {
    border-right: 1px solid var(--color-border);
}

.tc-opt-btn:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.tc-opt-btn.active,
.tc-opt-btn[aria-pressed="true"] {
    background: var(--color-accent);
    color: #ffffff;
}

/* Language selector */
#tc-select-lang {
    padding: 6px 10px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: 500;
    cursor: pointer;
    outline: none;
    font-family: var(--font-body);
    transition: border-color 0.15s, color 0.15s;
}

#tc-select-lang:hover,
#tc-select-lang:focus {
    border-color: var(--color-accent);
    color: var(--color-text);
}

/* More options toggle */
#tc-btn-more-opts {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    font-family: var(--font-body);
    white-space: nowrap;
}

#tc-btn-more-opts:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-accent);
    color: var(--color-text);
}

#tc-btn-more-opts.active {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Row 2 action buttons */
#tc-btn-swap,
#tc-btn-upload {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    font-family: var(--font-body);
    white-space: nowrap;
    text-decoration: none;
    line-height: 1;
}

#tc-btn-swap:hover,
#tc-btn-upload:hover {
    background: var(--color-bg);
    border-color: var(--color-accent);
    color: var(--color-text);
}

/* Hide actual file inputs */
#tc-file-orig,
#tc-file-mod {
    display: none;
}

/* Status indicator */
.tc-status {
    margin-left: auto;
    font-size: var(--text-xs);
    color: var(--color-accent);
    font-weight: 500;
    opacity: 0;
    transition: opacity 0.2s;
}

.tc-status.visible {
    opacity: 1;
}

/* ═══════════════════════════════════════════════════════════════════════════
   OPTIONS PANEL
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-opts-panel {
    display: none;
    padding: var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.tc-opts-panel.tc-opts-panel--open {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-3) var(--space-4);
}

.tc-opts-panel label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    user-select: none;
    transition: color 0.15s;
}

.tc-opts-panel label:hover {
    color: var(--color-text);
}

.tc-opts-panel input[type="checkbox"] {
    accent-color: var(--color-accent);
    width: 14px;
    height: 14px;
    cursor: pointer;
    flex-shrink: 0;
}

.tc-opts-panel select {
    padding: 4px 8px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-family: var(--font-body);
    cursor: pointer;
    outline: none;
    transition: border-color 0.15s;
}

.tc-opts-panel select:focus {
    border-color: var(--color-accent);
}

/* ═══════════════════════════════════════════════════════════════════════════
   EDITORS WRAP — split view
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-editors-wrap {
    display: flex;
    gap: 0;
    width: 100%;
    min-height: 400px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid #1E293B;
}

/* ── Individual Panel ─────────────────────────────────────────────────────── */
.tc-panel {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    background: #0F172A;
}

.tc-panel-orig {
    border-right: none;
}

.tc-panel-mod {
    border-left: none;
}

/* Theme variants */
.tc-theme--light .tc-panel {
    background: #FFFFFF;
    border-color: #E2E8F0;
}

/* ── Panel Header ──────────────────────────────────────────────────────────── */
.tc-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: #1E293B;
    border-bottom: 1px solid #334155;
    flex-shrink: 0;
    gap: var(--space-2);
}

.tc-theme--light .tc-panel-header {
    background: #F8FAFC;
    border-bottom-color: #E2E8F0;
}

.tc-panel-header > span {
    font-size: var(--text-xs);
    font-weight: 700;
    color: #94A3B8;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.tc-theme--light .tc-panel-header > span {
    color: #64748B;
}

.tc-panel-actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.tc-panel-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 8px;
    border: 1px solid #334155;
    border-radius: var(--radius-sm);
    background: transparent;
    color: #64748B;
    font-size: var(--text-xs);
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    font-family: var(--font-body);
    line-height: 1;
    text-decoration: none;
}

.tc-panel-btn:hover {
    background: #334155;
    color: #E2E8F0;
    border-color: #475569;
}

.tc-theme--light .tc-panel-btn {
    border-color: #E2E8F0;
    color: #94A3B8;
}

.tc-theme--light .tc-panel-btn:hover {
    background: #F1F5F9;
    color: #475569;
    border-color: #CBD5E1;
}

/* ── Editor Body ──────────────────────────────────────────────────────────── */
.tc-editor-body {
    position: relative;
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* Line numbers gutter */
.tc-line-numbers {
    flex-shrink: 0;
    width: 44px;
    padding: 12px 8px 12px 0;
    background: #0D1625;
    color: #64748B;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
    font-size: 12px;
    line-height: 1.6;
    text-align: right;
    user-select: none;
    pointer-events: none;
    overflow: hidden;
    white-space: pre;
    border-right: 1px solid #1E293B;
    box-sizing: border-box;
}

.tc-theme--light .tc-line-numbers {
    background: #F8FAFC;
    color: #94A3B8;
    border-right-color: #E2E8F0;
}

/* Overlay (diff rendering) */
.tc-editor-overlay {
    position: absolute;
    top: 0;
    left: 44px; /* align with textarea, past line numbers */
    right: 8px; /* leave space for minimap */
    bottom: 0;
    overflow: auto;
    padding: 12px 14px;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
    font-size: 13px;
    line-height: 1.6;
    color: #E2E8F0;
    white-space: pre;
    tab-size: 4;
    box-sizing: border-box;
    z-index: 2;
    pointer-events: none;
}

.tc-theme--light .tc-editor-overlay {
    color: #1E293B;
}

/* Textarea (hidden behind overlay for editing) */
.tc-editors-wrap textarea {
    opacity: 0;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    resize: none;
    border: none;
    outline: none;
    background: transparent;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
    font-size: 13px;
    line-height: 1.6;
    padding: 12px 14px 12px 58px;
    tab-size: 4;
    color: transparent;
    caret-color: #93C5FD;
    white-space: pre;
    overflow: auto;
    box-sizing: border-box;
}

/* When no diff is shown, make textarea visible for editing */
.tc-editors-wrap.tc-editing textarea {
    opacity: 1;
    color: #E2E8F0;
    z-index: 3;
}

.tc-theme--light .tc-editors-wrap.tc-editing textarea {
    color: #1E293B;
    caret-color: #3B82F6;
}

/* Minimap */
.tc-minimap {
    position: absolute;
    top: 0;
    right: 0;
    width: 8px;
    height: 100%;
    background: #0D1625;
    border-left: 1px solid #1E293B;
    cursor: pointer;
    z-index: 4;
    display: block;
}

.tc-theme--light .tc-minimap {
    background: #F8FAFC;
    border-left-color: #E2E8F0;
}

/* ── Panel Footer ──────────────────────────────────────────────────────────── */
.tc-panel-footer {
    flex-shrink: 0;
    padding: 5px 12px;
    background: #1E293B;
    border-top: 1px solid #334155;
    font-size: 11px;
    color: #475569;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tc-theme--light .tc-panel-footer {
    background: #F8FAFC;
    border-top-color: #E2E8F0;
    color: #94A3B8;
}

/* ── Gutter Center ─────────────────────────────────────────────────────────── */
.tc-gutter-center {
    flex-shrink: 0;
    width: 8px;
    background: #0A1020;
    position: relative;
    overflow: visible;
    z-index: 10;
}

.tc-theme--light .tc-gutter-center {
    background: #E2E8F0;
}

#tc-gutter-svg {
    position: absolute;
    top: 0;
    left: -20px;
    width: 48px;
    height: 100%;
    pointer-events: none;
    overflow: visible;
}

/* ═══════════════════════════════════════════════════════════════════════════
   DIFF LINE HIGHLIGHTING
   ═══════════════════════════════════════════════════════════════════════════ */

/* Each rendered line in the overlay */
.tc-line {
    display: block;
    min-height: 1.6em;
    padding-left: 4px;
    border-left: 3px solid transparent;
    box-sizing: border-box;
}

/* Dark theme (default) */
.tc-line-eq  { background: #0F172A; border-left-color: transparent; }
.tc-line-add { background: #052E16; border-left-color: #15803D; }
.tc-line-del { background: #450A0A; border-left-color: #B91C1C; }
.tc-line-mod { background: #1C1209; border-left-color: #B45309; }
.tc-line-mov { background: #0F1E3C; border-left-color: #1D4ED8; }

/* Light theme overrides */
.tc-theme--light .tc-line-eq  { background: #FFFFFF; }
.tc-theme--light .tc-line-add { background: #F0FDF4; border-left-color: #22C55E; }
.tc-theme--light .tc-line-del { background: #FFF5F5; border-left-color: #EF4444; }
.tc-theme--light .tc-line-mod { background: #FFFBEB; border-left-color: #F59E0B; }
.tc-theme--light .tc-line-mov { background: #EFF6FF; border-left-color: #3B82F6; }

/* Character-level highlights */
.tc-char-del {
    background: #7F1D1D;
    border-radius: 2px;
    padding: 0 1px;
}

.tc-char-add {
    background: #14532D;
    border-radius: 2px;
    padding: 0 1px;
}

.tc-theme--light .tc-char-del {
    background: #FEE2E2;
    color: #991B1B;
}

.tc-theme--light .tc-char-add {
    background: #DCFCE7;
    color: #166534;
}

/* Moved label badge */
.tc-moved-label {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-left: 8px;
    padding: 1px 6px;
    background: rgba(29, 78, 216, 0.25);
    border: 1px solid rgba(29, 78, 216, 0.4);
    border-radius: 10px;
    font-size: 10px;
    color: #93C5FD;
    font-family: var(--font-body);
    vertical-align: middle;
    font-weight: 500;
}

.tc-theme--light .tc-moved-label {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    color: #1D4ED8;
}

/* Collapsed unchanged sections */
.tc-collapsed-section {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 4px 8px;
    background: #1E293B;
    color: #64748B;
    font-size: 11px;
    font-family: var(--font-body);
    cursor: pointer;
    user-select: none;
    transition: background 0.15s, color 0.15s;
    border-left: 3px solid #334155;
}

.tc-collapsed-section:hover {
    background: #334155;
    color: #94A3B8;
}

.tc-theme--light .tc-collapsed-section {
    background: #F1F5F9;
    color: #94A3B8;
    border-left-color: #CBD5E1;
}

.tc-theme--light .tc-collapsed-section:hover {
    background: #E2E8F0;
    color: #64748B;
}

/* ═══════════════════════════════════════════════════════════════════════════
   NAVIGATION BAR
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-nav-bar {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    position: sticky;
    top: 0;
    z-index: 20;
}

.tc-nav-similarity {
    font-size: var(--text-sm);
    font-weight: 700;
    flex-shrink: 0;
}

/* Color tiers for similarity */
.tc-nav-similarity.tc-sim--high  { color: #22C55E; }
.tc-nav-similarity.tc-sim--mid   { color: #F59E0B; }
.tc-nav-similarity.tc-sim--low   { color: #EF4444; }

#tc-nav-similarity {
    font-variant-numeric: tabular-nums;
}

.tc-nav-controls {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-left: auto;
}

#tc-nav-prev,
#tc-nav-next {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 10px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-secondary);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    font-family: var(--font-body);
    white-space: nowrap;
}

#tc-nav-prev:hover,
#tc-nav-next:hover {
    background: var(--color-bg);
    border-color: var(--color-accent);
    color: var(--color-text);
}

#tc-nav-prev:disabled,
#tc-nav-next:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

#tc-nav-counter {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-text-muted);
    min-width: 48px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

#tc-nav-jump {
    padding: 5px 8px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-family: var(--font-body);
    cursor: pointer;
    outline: none;
    max-width: 160px;
    transition: border-color 0.15s;
}

#tc-nav-jump:focus {
    border-color: var(--color-accent);
}

/* Processing bar */
.tc-processing-wrap {
    display: none;
    align-items: center;
    gap: var(--space-2);
    flex: 1;
    min-width: 120px;
}

.tc-processing-wrap.visible {
    display: flex;
}

.tc-processing-bar {
    flex: 1;
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
}

.tc-processing-fill {
    height: 100%;
    background: var(--color-accent);
    border-radius: 2px;
    width: 0%;
    transition: width 0.3s ease;
}

#tc-processing-text {
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   INLINE VIEW
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-inline-view {
    display: none;
    flex-direction: column;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid #1E293B;
    background: #0F172A;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
    font-size: 13px;
    line-height: 1.6;
}

.tc-inline-view.active {
    display: flex;
}

.tc-theme--light .tc-inline-view {
    background: #FFFFFF;
    border-color: #E2E8F0;
}

.tc-inline-line {
    display: block;
    padding: 1px 16px 1px 4px;
    border-left: 3px solid transparent;
    white-space: pre;
    min-height: 1.6em;
}

/* Reuse same line color classes defined above */

/* ═══════════════════════════════════════════════════════════════════════════
   STATISTICS DASHBOARD
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-stats {
    padding: var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.tc-stats-row1 {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-3);
}

.tc-stats-row2 {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.tc-stats-row2 > span {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
}

/* Similarity meter */
.tc-stats-sim {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex: 1;
    min-width: 200px;
}

.tc-stats-sim > span:first-child {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    white-space: nowrap;
    font-weight: 600;
}

#tc-stats-similarity-pct {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-text);
    min-width: 44px;
    font-variant-numeric: tabular-nums;
}

.tc-stats-bar {
    flex: 1;
    height: 8px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    min-width: 60px;
}

.tc-stats-bar-fill {
    height: 100%;
    border-radius: 4px;
    width: 0%;
    transition: width 0.4s ease, background-color 0.4s ease;
    background: #22C55E;
}

/* Stats cards */
.tc-stats-cards {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.tc-stats-card {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 5px 10px;
    border-radius: var(--radius-md);
    border: 1px solid;
    font-size: var(--text-xs);
    font-weight: 700;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.tc-stats-card--add {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.3);
    color: #4ADE80;
}

.tc-stats-card--del {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #F87171;
}

.tc-stats-card--mod {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
    color: #FCD34D;
}

.tc-stats-card--mov {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    color: #93C5FD;
}

/* Light theme stat card text adjustments */
.tc-theme--light .tc-stats-card--add { color: #16A34A; }
.tc-theme--light .tc-stats-card--del { color: #DC2626; }
.tc-theme--light .tc-stats-card--mod { color: #D97706; }
.tc-theme--light .tc-stats-card--mov { color: #2563EB; }

/* ═══════════════════════════════════════════════════════════════════════════
   ACTIONS BAR
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.tc-actions > button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 7px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    font-family: var(--font-body);
    white-space: nowrap;
}

.tc-actions > button:hover {
    background: var(--color-bg);
    border-color: var(--color-accent);
    color: var(--color-text);
}

#tc-btn-merge-open {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.35);
    color: var(--color-accent);
}

#tc-btn-merge-open:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--color-accent);
}

/* ═══════════════════════════════════════════════════════════════════════════
   TABS
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-tabs {
    display: flex;
    align-items: center;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: 0 var(--space-4);
    overflow-x: auto;
}

.tc-tab-btn {
    padding: 11px 16px;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.15s, border-color 0.15s;
    white-space: nowrap;
    font-family: var(--font-body);
    letter-spacing: 0.02em;
}

.tc-tab-btn:hover {
    color: var(--color-text);
}

.tc-tab-btn.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* Tab panels */
.tc-tab-panel {
    display: none;
    padding: var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.tc-tab-panel.active {
    display: block;
}

/* ═══════════════════════════════════════════════════════════════════════════
   MERGE EDITOR PANEL
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-merge-progress-wrap {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--color-border);
}

.tc-merge-progress {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    flex: 1;
}

#tc-merge-accept-all,
#tc-merge-reject-all {
    padding: 6px 14px;
    border-radius: var(--radius-md);
    border: 1px solid;
    font-size: var(--text-xs);
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
    font-family: var(--font-body);
}

#tc-merge-accept-all {
    background: rgba(34, 197, 94, 0.12);
    border-color: rgba(34, 197, 94, 0.35);
    color: #4ADE80;
}

#tc-merge-accept-all:hover { background: rgba(34, 197, 94, 0.22); }

#tc-merge-reject-all {
    background: rgba(239, 68, 68, 0.12);
    border-color: rgba(239, 68, 68, 0.35);
    color: #F87171;
}

#tc-merge-reject-all:hover { background: rgba(239, 68, 68, 0.22); }

/* Merge list */
.tc-merge-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    max-height: 420px;
    overflow-y: auto;
    margin-bottom: var(--space-4);
    padding-right: var(--space-1);
}

.tc-merge-list::-webkit-scrollbar {
    width: 4px;
}

.tc-merge-list::-webkit-scrollbar-track { background: transparent; }

.tc-merge-list::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}

.tc-merge-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.15s;
}

.tc-merge-item.tc-merge-accepted { border-color: rgba(34, 197, 94, 0.4); }
.tc-merge-item.tc-merge-rejected { border-color: rgba(239, 68, 68, 0.4); }

.tc-merge-item-header {
    padding: 6px 12px;
    background: var(--color-bg-secondary);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
}

.tc-merge-versions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

.tc-merge-orig,
.tc-merge-mod {
    padding: 8px 12px;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
    font-size: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
    min-height: 2em;
    background: #0F172A;
    color: #E2E8F0;
}

.tc-merge-orig {
    background: #450A0A;
    color: #FCA5A5;
    border-right: 1px solid #1E293B;
}

.tc-merge-mod {
    background: #052E16;
    color: #86EFAC;
}

.tc-merge-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 8px 12px;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.tc-merge-accept,
.tc-merge-reject {
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid;
    font-size: var(--text-xs);
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
    font-family: var(--font-body);
}

.tc-merge-accept {
    background: rgba(34, 197, 94, 0.12);
    border-color: rgba(34, 197, 94, 0.35);
    color: #4ADE80;
}

.tc-merge-accept:hover { background: rgba(34, 197, 94, 0.24); }

.tc-merge-reject {
    background: rgba(239, 68, 68, 0.12);
    border-color: rgba(239, 68, 68, 0.35);
    color: #F87171;
}

.tc-merge-reject:hover { background: rgba(239, 68, 68, 0.24); }

/* Merge preview */
.tc-merge-preview-wrap {
    margin-top: var(--space-4);
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-4);
}

.tc-merge-preview-wrap > label {
    display: block;
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: var(--space-2);
}

#tc-merge-preview {
    display: block;
    padding: 14px;
    background: #0F172A;
    border: 1px solid #1E293B;
    border-radius: var(--radius-md);
    color: #E2E8F0;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
    font-size: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 260px;
    overflow-y: auto;
    margin: 0;
}

.tc-merge-copy-row {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-3);
}

#tc-merge-copy-btn,
#tc-merge-dl-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 7px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    font-family: var(--font-body);
}

#tc-merge-copy-btn:hover,
#tc-merge-dl-btn:hover {
    background: var(--color-bg);
    border-color: var(--color-accent);
    color: var(--color-text);
}

/* ═══════════════════════════════════════════════════════════════════════════
   READABILITY TABLE
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-readability-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}

.tc-readability-table th {
    text-align: left;
    padding: 8px 12px;
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
}

.tc-readability-table td {
    padding: 9px 12px;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border-subtle);
    font-variant-numeric: tabular-nums;
}

.tc-readability-table tr:last-child td {
    border-bottom: none;
}

.tc-readability-table tr:hover td {
    background: var(--color-bg-secondary);
}

.tc-readability-table td:first-child {
    color: var(--color-text-muted);
    font-weight: 500;
}

.tc-readability-table td.tc-change-pos {
    color: #4ADE80;
    font-weight: 600;
}

.tc-readability-table td.tc-change-neg {
    color: #F87171;
    font-weight: 600;
}

/* ═══════════════════════════════════════════════════════════════════════════
   WORD FREQUENCY
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-wf-section {
    margin-bottom: var(--space-4);
}

.tc-wf-section:last-child {
    margin-bottom: 0;
}

.tc-wf-section > h4 {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0 0 var(--space-2) 0;
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-border);
}

.tc-wf-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.tc-wf-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 8px;
    border-radius: 10px;
    font-size: var(--text-xs);
    font-weight: 600;
    border: 1px solid;
}

.tc-wf-tag--new {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.3);
    color: #4ADE80;
}

.tc-wf-tag--removed {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #F87171;
}

.tc-wf-tag--changed {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
    color: #FCD34D;
}

.tc-wf-tag > span {
    opacity: 0.7;
    font-weight: 400;
}

/* ═══════════════════════════════════════════════════════════════════════════
   HISTORY PANEL
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
    max-height: 360px;
    overflow-y: auto;
}

.tc-history-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.tc-history-item:hover {
    background: var(--color-bg);
    border-color: var(--color-accent);
}

.tc-history-meta {
    flex: 1;
    min-width: 0;
}

.tc-history-date {
    font-size: var(--text-xs);
    color: var(--color-text-subtle);
}

.tc-history-preview {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
}

#tc-history-clear {
    padding: 6px 14px;
    border: 1px solid rgba(239, 68, 68, 0.35);
    border-radius: var(--radius-md);
    background: rgba(239, 68, 68, 0.1);
    color: #F87171;
    font-size: var(--text-xs);
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s;
    font-family: var(--font-body);
}

#tc-history-clear:hover {
    background: rgba(239, 68, 68, 0.2);
}

/* ═══════════════════════════════════════════════════════════════════════════
   SCROLLBAR STYLING (editor areas)
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-editor-overlay::-webkit-scrollbar,
.tc-inline-view::-webkit-scrollbar,
#tc-merge-preview::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.tc-editor-overlay::-webkit-scrollbar-track,
.tc-inline-view::-webkit-scrollbar-track,
#tc-merge-preview::-webkit-scrollbar-track {
    background: transparent;
}

.tc-editor-overlay::-webkit-scrollbar-thumb,
.tc-inline-view::-webkit-scrollbar-thumb,
#tc-merge-preview::-webkit-scrollbar-thumb {
    background: #334155;
    border-radius: 3px;
}

.tc-editor-overlay::-webkit-scrollbar-thumb:hover,
.tc-inline-view::-webkit-scrollbar-thumb:hover,
#tc-merge-preview::-webkit-scrollbar-thumb:hover {
    background: #475569;
}

/* ═══════════════════════════════════════════════════════════════════════════
   EMPTY / PLACEHOLDER STATES
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: 120px;
    color: var(--color-text-subtle);
    font-size: var(--text-sm);
    text-align: center;
}

/* ═══════════════════════════════════════════════════════════════════════════
   FOCUS STYLES
   ═══════════════════════════════════════════════════════════════════════════ */
.tc-opt-btn:focus-visible,
.tc-panel-btn:focus-visible,
#tc-btn-swap:focus-visible,
#tc-btn-upload:focus-visible,
#tc-btn-more-opts:focus-visible,
#tc-nav-prev:focus-visible,
#tc-nav-next:focus-visible,
.tc-tab-btn:focus-visible,
.tc-merge-accept:focus-visible,
.tc-merge-reject:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE — TABLET (max 900px)
   ═══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
    .tc-merge-versions {
        grid-template-columns: 1fr;
    }

    .tc-merge-orig {
        border-right: none;
        border-bottom: 1px solid #1E293B;
    }

    .tc-stats-row1 {
        flex-direction: column;
        align-items: stretch;
    }

    .tc-stats-sim {
        min-width: unset;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE — MOBILE (max 768px)
   ═══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
    /* Stack panels vertically */
    .tc-editors-wrap {
        flex-direction: column;
        min-height: unset;
    }

    .tc-panel {
        min-height: 250px;
    }

    .tc-panel-orig {
        border-bottom: 1px solid #1E293B;
    }

    /* Hide gutter svg connector lines on mobile */
    .tc-gutter-center {
        display: none;
    }

    /* Hide minimap on mobile */
    .tc-minimap {
        display: none;
    }

    /* Adjust overlay right edge since no minimap */
    .tc-editor-overlay {
        right: 0;
    }

    /* Nav bar sticks to bottom on mobile */
    .tc-nav-bar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        top: auto;
        border-radius: 0;
        border-left: none;
        border-right: none;
        border-bottom: none;
        z-index: 100;
        box-shadow: var(--shadow-lg);
    }

    /* Toolbar row1 options condense */
    .tc-toolbar-row1,
    .tc-toolbar-row2 {
        gap: var(--space-1);
    }

    .tc-opt-btn {
        padding: 5px 8px;
        font-size: 11px;
    }

    /* Options panel full width */
    .tc-opts-panel.tc-opts-panel--open {
        grid-template-columns: 1fr 1fr;
    }

    /* Actions bar wraps tightly */
    .tc-actions {
        padding: var(--space-2) var(--space-3);
    }

    .tc-actions > button {
        padding: 6px 10px;
        font-size: var(--text-xs);
    }

    /* Stats cards wrap */
    .tc-stats-cards {
        gap: var(--space-1);
    }

    /* Tabs scroll */
    .tc-tabs {
        padding: 0 var(--space-2);
    }

    .tc-tab-btn {
        padding: 10px 12px;
        font-size: var(--text-xs);
    }

    /* Readability table horizontal scroll */
    #tc-panel-readability {
        overflow-x: auto;
    }
}

@media (max-width: 480px) {
    .tc-opts-panel.tc-opts-panel--open {
        grid-template-columns: 1fr;
    }

    .tc-toolbar-row1 {
        flex-wrap: wrap;
    }

    #tc-btn-more-opts {
        margin-left: 0;
    }

    .tc-stats-cards {
        justify-content: flex-start;
    }
}