/* ========= DIFF VIEWER ========= */

.dv-app {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}

/* Fullscreen */
.dv-app.dv-fullscreen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  border-radius: 0;
  border: none;
}

/* ===== HEADER ===== */

.dv-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 12px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.dv-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.dv-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.dv-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.dv-header-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}

/* View Toggle */
.dv-view-toggle {
  display: flex;
  gap: 2px;
  background: var(--surface-2);
  padding: 3px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.dv-view-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.15s;
  font-family: var(--font-sans);
  white-space: nowrap;
}

.dv-view-btn:hover { color: var(--text); }

.dv-view-btn.active {
  background: var(--accent);
  color: #080b14;
  font-weight: 600;
}

.dv-view-btn svg { flex-shrink: 0; }

/* Options */
.dv-option-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s;
}

.dv-option-label:hover { color: var(--text); }

.dv-option-label input[type="checkbox"] {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
  cursor: pointer;
}

/* ===== INPUT AREA ===== */

.dv-input-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.dv-input-area.has-output {
  flex: 0 0 35%;
  min-height: 120px;
}

.dv-input-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
  position: relative;
}

.dv-input-panel:first-child {
  border-right: 1px solid var(--border);
}

/* Drag over state */
.dv-input-panel.dv-dragover {
  background: var(--accent-light);
}

.dv-input-panel.dv-dragover .dv-textarea {
  opacity: 0.5;
}

.dv-input-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
  gap: 8px;
  flex-shrink: 0;
}

.dv-input-panel-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.dv-input-panel-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dv-input-panel-info {
  font-size: 11px;
  color: var(--text-muted);
  opacity: 0.7;
}

.dv-upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
  background: var(--surface);
  border: 1px solid var(--border);
}

.dv-upload-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.dv-textarea {
  width: 100%;
  flex: 1;
  background: var(--bg);
  color: var(--text);
  border: none;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  resize: none;
  outline: none;
  tab-size: 2;
  min-height: 0;
}

.dv-textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.4;
}

/* ===== OUTPUT AREA ===== */

.dv-output-area {
  display: none;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  border-top: 1px solid var(--border);
}

.dv-output-area.visible {
  display: flex;
}

.dv-output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  gap: 12px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.dv-output-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.dv-output-header-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dv-output-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

/* Stats */
.dv-stats {
  display: flex;
  gap: 14px;
  font-size: 12px;
}

.dv-stat {
  display: flex;
  align-items: center;
  gap: 5px;
  font-weight: 500;
}

.dv-stat-added { color: var(--green); }
.dv-stat-removed { color: var(--red); }
.dv-stat-unchanged { color: var(--text-muted); }

.dv-stat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.dv-stat-dot.added { background: var(--green); }
.dv-stat-dot.removed { background: var(--red); }
.dv-stat-dot.unchanged { background: var(--text-muted); opacity: 0.4; }

/* Change Navigator */
.dv-change-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px;
}

.dv-nav-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.15s;
}

.dv-nav-btn:hover {
  background: var(--surface-2);
  color: var(--accent);
}

.dv-nav-info {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  padding: 0 8px;
  min-width: 60px;
  text-align: center;
  white-space: nowrap;
}

/* Action Buttons */
.dv-action-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.15s;
}

.dv-action-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--surface-2);
}

/* ===== SIDE-BY-SIDE VIEW ===== */

.dv-side-view {
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.dv-side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

.dv-side-panel {
  overflow: auto;
  background: var(--bg);
}

.dv-side-panel:first-child {
  border-right: 1px solid var(--border);
}

.dv-side-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
}

.dv-side-table td {
  padding: 0 12px;
  vertical-align: top;
  white-space: pre;
}

/* ===== INLINE VIEW ===== */

.dv-inline-view {
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.dv-inline-scroll {
  height: 100%;
  overflow: auto;
  background: var(--bg);
}

.dv-inline-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
}

.dv-inline-table td {
  padding: 0 10px;
  vertical-align: top;
  white-space: pre;
}

/* ===== SHARED ROW STYLES ===== */

.dv-line-num {
  width: 48px;
  min-width: 48px;
  text-align: right;
  color: var(--text-muted);
  opacity: 0.4;
  user-select: none;
  padding-right: 10px !important;
  border-right: 1px solid var(--border);
  font-size: 12px;
}

.dv-line-indicator {
  width: 20px;
  min-width: 20px;
  text-align: center;
  font-weight: 700;
  user-select: none;
}

.dv-line-content {
  min-width: 0;
}

/* Row types */
.dv-row-added {
  background: rgba(0, 184, 148, 0.08);
}

.dv-row-added .dv-line-indicator { color: var(--green); }
.dv-row-added .dv-line-num { color: var(--green); opacity: 0.5; }

.dv-row-removed {
  background: rgba(255, 107, 107, 0.08);
}

.dv-row-removed .dv-line-indicator { color: var(--red); }
.dv-row-removed .dv-line-num { color: var(--red); opacity: 0.5; }

.dv-row-unchanged {
  background: transparent;
}

.dv-row-empty {
  background: var(--surface-2);
  opacity: 0.3;
}

/* Current change highlight */
.dv-current-change {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  position: relative;
}

.dv-current-change .dv-line-num {
  opacity: 1;
  font-weight: 700;
}

/* Character-level highlighting */
.dv-char-added {
  background: rgba(0, 184, 148, 0.3);
  border-radius: 2px;
  padding: 0 1px;
}

.dv-char-removed {
  background: rgba(255, 107, 107, 0.3);
  border-radius: 2px;
  padding: 0 1px;
  text-decoration: line-through;
  text-decoration-color: rgba(255, 107, 107, 0.5);
}

/* Word-level (kept for backward compat) */
.dv-word-added {
  background: rgba(0, 184, 148, 0.25);
  border-radius: 2px;
  padding: 0 1px;
}

.dv-word-removed {
  background: rgba(255, 107, 107, 0.25);
  border-radius: 2px;
  padding: 0 1px;
}

/* Collapse / expand rows */
.dv-row-collapse td {
  padding: 0 !important;
}

.dv-collapse-line {
  text-align: center;
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 4px 12px !important;
}

.dv-expand-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 10px;
  border-radius: 4px;
  transition: all 0.15s;
}

.dv-expand-btn:hover {
  color: var(--accent);
  background: var(--accent-light);
}

.dv-expand-btn svg {
  flex-shrink: 0;
}

/* ===== STATUS BAR ===== */

.dv-status-bar {
  padding: 5px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
  gap: 8px;
}

.dv-status-left {
  display: flex;
  gap: 16px;
}

.dv-shortcut-hint {
  opacity: 0.6;
}

/* ===== RESPONSIVE ===== */

@media (max-width: 1024px) {
  .dv-header {
    padding: 8px 12px;
    gap: 8px;
  }

  .dv-option-label span {
    display: none;
  }

  .dv-view-btn span {
    display: none;
  }
}

@media (max-width: 768px) {
  .dv-header-left {
    width: 100%;
    justify-content: space-between;
  }

  .dv-header-right {
    width: 100%;
  }

  .dv-input-area {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }

  .dv-input-panel:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

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

  .dv-side-panel:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .dv-output-header-left,
  .dv-output-header-right {
    width: 100%;
  }

  .dv-output-header-right {
    justify-content: space-between;
  }

  .dv-status-left {
    display: none;
  }

  .dv-upload-btn span,
  .dv-upload-btn svg + span {
    display: none;
  }

  .dv-option-label {
    font-size: 11px;
  }

  .dv-side-table td,
  .dv-inline-table td {
    padding: 0 6px;
    font-size: 11px;
  }

  .dv-line-num {
    width: 32px;
    min-width: 32px;
    font-size: 10px;
  }
}