@charset "UTF-8";

/* =========================================
   Variables
   ========================================= */
:root {
  --c-primary: #3b82f6;       /* Blue 500 */
  --c-primary-hover: #2563eb;
  --c-bg: #f8fafc;            /* Gray 50 */
  --c-card-bg: #ffffff;
  --c-text-main: #1e293b;     /* Slate 800 */
  --c-text-sub: #64748b;      /* Slate 500 */
  --c-border: #e2e8f0;
  --c-input-bg: #f1f5f9;      /* Slate 100 */
  --c-header-bg: #f8fafc;
  
  --c-diff-del-bg: #fecdd3;     /* Rose 200 (Darker for contrast) */
  --c-diff-del-text: #9f1239;    /* Rose 800 */
  --c-diff-add-bg: #bbf7d0;     /* Green 200 */
  --c-diff-add-text: #166534;    /* Green 800 */

  /* 行全体の薄い背景（GitHub風） */
  --c-diff-del-bg-line: rgba(254, 205, 211, 0.35);
  --c-diff-add-bg-line: rgba(187, 247, 208, 0.35);
  
  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  --radius-md: 10px;
  --radius-lg: 20px;
  
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-primary: #60a5fa;
    --c-bg: #0f172a;
    --c-card-bg: #1e293b;
    --c-text-main: #f1f5f9;
    --c-text-sub: #94a3b8;
    --c-border: #334155;
    --c-input-bg: #0f172a;
    --c-header-bg: #1e293b;
    
    --c-diff-del-bg: #881337;
    --c-diff-del-text: #fecdd3;
    --c-diff-add-bg: #14532d;
    --c-diff-add-text: #bbf7d0;

    /* 行全体の薄い背景（GitHub風） */
    --c-diff-del-bg-line: rgba(136, 19, 55, 0.25);
    --c-diff-add-bg-line: rgba(20, 83, 45, 0.25);
  }
}

/* =========================================
   Base & Typography
   ========================================= */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--c-bg); color: var(--c-text-main);
  margin: 0; padding: 20px; line-height: 1.6;
}

.tool-wrapper {
  max-width: 1280px; margin: 0 auto;
  background: var(--c-card-bg); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card); padding: 30px; box-sizing: border-box;
}

/* Header */
.tool-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 20px; border-bottom: 1px solid var(--c-border); padding-bottom: 20px;
  flex-wrap: wrap; gap: 15px;
}
.app-title { font-size: 1.8rem; font-weight: 900; margin: 0; letter-spacing: -0.03em; }
.app-title .accent { color: var(--c-primary); }
.app-desc { margin: 5px 0 0; color: var(--c-text-sub); font-size: 0.9rem; }

.badge-security {
  background: var(--c-bg); color: var(--c-primary); border: 1px solid var(--c-primary);
  padding: 4px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: bold;
  display: flex; align-items: center; gap: 5px; white-space: nowrap;
}

/* =========================================
   Controls
   ========================================= */
.control-bar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 20px; flex-wrap: wrap; gap: 20px;
  background: var(--c-input-bg); padding: 10px 15px; border-radius: var(--radius-md);
  border: 1px solid var(--c-border);
}
.control-group { display: flex; align-items: center; gap: 10px; }
.control-label { font-size: 0.85rem; font-weight: bold; color: var(--c-text-sub); }

.toggle-switch {
  display: flex; background: var(--c-card-bg); padding: 3px;
  border-radius: 6px; border: 1px solid var(--c-border);
}
.radio-label input { display: none; }
.radio-btn {
  display: block; padding: 6px 14px; border-radius: 4px;
  font-size: 0.85rem; cursor: pointer; color: var(--c-text-sub); font-weight: bold; transition: all 0.2s;
}
.radio-label input:checked + .radio-btn {
  background: var(--c-primary); color: #fff; box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.actions { display: flex; gap: 10px; margin-left: auto; align-items: center; flex-wrap: wrap; }
.btn-primary, .btn-secondary, .btn-text {
  border: none; border-radius: 6px; padding: 10px 20px; font-weight: bold;
  cursor: pointer; display: flex; align-items: center; gap: 8px; transition: all 0.2s; font-size: 0.9rem;
}
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-secondary { background: var(--c-input-bg); color: var(--c-text-main); border: 1px solid var(--c-border); }
.btn-secondary:hover { background: var(--c-bg); border-color: #d1d5db; }
.btn-text { background: transparent; color: var(--c-text-sub); text-decoration: underline; padding: 8px 10px; }
.btn-text:hover { color: var(--c-text-main); }

.btn-paste {
  background: transparent; border: 1px solid var(--c-border); border-radius: 4px;
  font-size: 0.75rem; padding: 4px 10px; cursor: pointer; color: var(--c-text-sub); font-weight: bold;
}
.btn-paste:hover { background: var(--c-bg); color: var(--c-primary); border-color: var(--c-primary); }

/* Alert Box */
.alert-box {
  background: #fee2e2; color: #b91c1c; border: 1px solid #fecaca;
  padding: 10px 15px; border-radius: var(--radius-md); margin-bottom: 20px;
  font-size: 0.9rem; font-weight: bold;
}

/* =========================================
   Editor Layout
   ========================================= */
.two-pane { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.pane { display: flex; flex-direction: column; min-width: 0; position: relative; }
.pane-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 8px; font-size: 0.85rem; font-weight: bold; color: var(--c-text-sub);
}
.char-count { font-family: var(--font-mono); margin-right: 10px; font-size: 0.75rem; }

.input-area {
  width: 100%; height: 400px; padding: 15px;
  border: 2px solid var(--c-border); border-radius: var(--radius-md);
  background: var(--c-input-bg); color: var(--c-text-main);
  font-family: var(--font-mono); font-size: 16px; line-height: 1.6;
  box-sizing: border-box; resize: vertical; tab-size: 2;
}
.input-area:focus { outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2); }

/* =========================================
   Result View
   ========================================= */
.result-header {
  position: sticky;
  top: 10px;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  background: rgba(255, 255, 255, 0.85); /* プレミアムすりガラス背景 */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.04);
  box-sizing: border-box;
}
@media (prefers-color-scheme: dark) {
  .result-header {
    background: rgba(30, 41, 59, 0.85);
    border-color: var(--c-border);
  }
}
.result-header h2 { margin: 0; font-size: 1.2rem; }
.result-actions { display: flex; align-items: center; gap: 12px; }
.status-msg {
  color: #16a34a; font-weight: bold; font-size: 0.9rem;
  background: #dcfce7; padding: 4px 12px; border-radius: 20px;
  display: inline-flex; align-items: center; gap: 5px;
}

.diff-pane {
  width: 100%; height: 500px;
  border: 1px solid var(--c-border); border-radius: var(--radius-md);
  background: var(--c-card-bg); color: var(--c-text-main);
  font-family: var(--font-mono); font-size: 14px; line-height: 1.6;
  overflow: auto; /* 両方向スクロール */
  position: relative;
}
.diff-pane:focus { outline: 2px solid var(--c-primary); outline-offset: -2px; }

/* Sticky Header */
.pane-sticky-header {
  position: sticky; top: 0; left: 0; z-index: 10;
  background: var(--c-header-bg); border-bottom: 1px solid var(--c-border);
  padding: 8px 15px; font-size: 0.8rem; font-weight: bold; color: var(--c-text-sub);
  width: 100%; box-sizing: border-box;
}

.diff-content { padding: 0; white-space: pre-wrap; word-break: break-all; }

/* Diff Coloring & Line Highlighting */
.diff-line {
  display: flex;
  min-height: 1.6em;
  padding: 0;
  box-sizing: border-box;
  width: 100%;
}
.diff-line:hover {
  background-color: rgba(0, 0, 0, 0.02);
}
@media (prefers-color-scheme: dark) {
  .diff-line:hover {
    background-color: rgba(255, 255, 255, 0.02);
  }
}

.diff-line.del {
  background-color: var(--c-diff-del-bg-line);
}
.diff-line.add {
  background-color: var(--c-diff-add-bg-line);
}
.diff-line.mod {
  background-color: rgba(59, 130, 246, 0.08); /* 変更行は上品な薄いブルー */
}
@media (prefers-color-scheme: dark) {
  .diff-line.mod {
    background-color: rgba(96, 165, 250, 0.15);
  }
}

.diff-line-num {
  width: 3.5em;
  text-align: right;
  padding-right: 12px;
  color: var(--c-text-sub);
  user-select: none;
  font-family: var(--font-mono);
  font-size: 0.85em;
  opacity: 0.6;
  border-right: 1px solid var(--c-border);
  box-sizing: border-box;
}
.diff-line.del .diff-line-num {
  border-right-color: rgba(239, 68, 68, 0.2);
  background-color: rgba(239, 68, 68, 0.05);
}
.diff-line.add .diff-line-num {
  border-right-color: rgba(34, 197, 94, 0.2);
  background-color: rgba(34, 197, 94, 0.05);
}
.diff-line.mod .diff-line-num {
  border-right-color: rgba(59, 130, 246, 0.2);
  background-color: rgba(59, 130, 246, 0.04);
}

.diff-line-marker {
  width: 1.8em;
  text-align: center;
  user-select: none;
  font-weight: bold;
  opacity: 0.7;
  font-family: var(--font-mono);
  font-size: 0.9em;
  display: flex;
  align-items: center;
  justify-content: center;
}
.diff-line.del .diff-line-marker {
  color: var(--c-diff-del-text);
}
.diff-line.add .diff-line-marker {
  color: var(--c-diff-add-text);
}
.diff-line.mod .diff-line-marker {
  color: var(--c-primary);
}

.diff-line-content {
  flex: 1;
  white-space: pre-wrap;
  word-break: break-all;
  padding-left: 10px;
  padding-right: 10px;
  font-family: var(--font-mono);
  box-sizing: border-box;
}

ins {
  background-color: var(--c-diff-add-bg); color: var(--c-diff-add-text);
  text-decoration: none; border-radius: 3px;
  padding: 1px 3px;
  font-weight: bold;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
del {
  background-color: var(--c-diff-del-bg); color: var(--c-diff-del-text);
  text-decoration: line-through; border-radius: 3px;
  padding: 1px 3px;
  opacity: 0.9;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
ins::after, del::after {
  content: "↵"; opacity: 0.3; font-size: 0.8em; margin-left: 1px; user-select: none;
}

.unified-view .diff-pane { width: 100%; }

.legend { display: flex; gap: 20px; margin-top: 15px; font-size: 0.85rem; flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 5px; font-weight: bold; }
.swatch { width: 14px; height: 14px; border-radius: 3px; border: 1px solid rgba(0,0,0,0.1); }
.swatch.add { background: var(--c-diff-add-bg); border-bottom: 2px solid var(--c-diff-add-text); }
.swatch.del { background: var(--c-diff-del-bg); text-decoration: line-through; }
.legend-item.note { color: var(--c-text-sub); font-weight: normal; margin-left: auto; }

/* =========================================
   Undo Toast UI (Glassmorphism)
   ========================================= */
.undo-toast {
  position: fixed;
  top: 24px; /* 上部シフト */
  left: 50%;
  transform: translateX(-50%) translateY(-100px); /* 上からスライドダウン */
  z-index: 1000;
  width: 90%;
  max-width: 400px;
  background: rgba(30, 41, 59, 0.85); /* Slate 800 with transparency */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}
.undo-toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.undo-toast-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
}
.undo-msg {
  color: #f8fafc;
  font-size: 0.9rem;
  font-weight: 500;
}
.btn-undo {
  background: var(--c-primary);
  color: white;
  border: none;
  border-radius: 4px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-undo:hover {
  background: var(--c-primary-hover);
  transform: scale(1.05);
}
.btn-undo:active {
  transform: scale(0.95);
}
.undo-progress {
  height: 4px;
  background: var(--c-primary);
  width: 100%;
  transform-origin: left;
  transform: scaleX(1);
}

/* =========================================
   Sister Tools (Glassmorphism & Grids)
   ========================================= */
.sister-tools {
  margin-top: 40px;
  border-top: 1px solid var(--c-border);
  padding-top: 30px;
}
.sister-tools h3 {
  font-size: 1.25rem;
  margin-bottom: 20px;
}
.sister-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.sister-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}
.sister-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-primary);
  box-shadow: 0 12px 20px -8px rgba(59, 130, 246, 0.15);
  background: var(--c-card-bg);
}
.sister-icon {
  font-size: 2rem;
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
  transition: transform 0.3s ease;
}
.sister-card:hover .sister-icon {
  transform: scale(1.1) rotate(5deg);
  border-color: var(--c-primary);
}
.sister-info h4 {
  margin: 0 0 6px 0;
  font-size: 1.05rem;
  color: var(--c-text-main);
  transition: color 0.2s ease;
}
.sister-card:hover .sister-info h4 {
  color: var(--c-primary);
}
.sister-info p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--c-text-sub);
  line-height: 1.5;
}

@media (max-width: 600px) {
  .sister-grid {
    grid-template-columns: 1fr;
  }
}

/* Loading */
.loading-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(255,255,255,0.7); backdrop-filter: blur(2px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  z-index: 100; font-weight: bold; color: var(--c-primary);
}
.spinner {
  width: 40px; height: 40px; border: 4px solid #e2e8f0; border-top-color: var(--c-primary);
  border-radius: 50%; animation: spin 1s linear infinite; margin-bottom: 10px;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Article & FAQ */
.article-content { margin-top: 50px; border-top: 1px solid var(--c-border); padding-top: 30px; }
.article-content h2 { font-size: 1.5rem; margin-bottom: 1rem; border-bottom: 2px solid var(--c-primary); padding-bottom: 10px; display: inline-block; }
.article-content h3 { font-size: 1.2rem; margin-top: 2rem; margin-bottom: 1rem; }
/* FAQ Styles */
.faq-section { margin-top: 40px; background: var(--c-input-bg); padding: 25px; border-radius: var(--radius-md); border: 1px solid var(--c-border); }
.faq-list { margin: 0; padding: 0; }
.faq-item { margin-bottom: 25px; }
.faq-item:last-child { margin-bottom: 0; }
.faq-item dt { font-weight: bold; color: var(--c-text-main); margin-bottom: 8px; position: relative; padding-left: 24px; font-size: 1rem; }
.faq-item dt::before { content: "Q."; color: var(--c-primary); position: absolute; left: 0; font-weight: 900; }
.faq-item dd { margin: 0; padding-left: 24px; color: var(--c-text-sub); font-size: 0.95rem; line-height: 1.6; }

.tool-footer {
  margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--c-border);
  display: flex; justify-content: center; gap: 14px; flex-wrap: wrap;
  color: var(--c-text-sub); font-size: 0.85rem;
}
.tool-footer a { color: inherit; text-decoration: none; }
.tool-footer a:hover { color: var(--c-primary); text-decoration: underline; }

/* Mobile Optimization */
@media (max-width: 768px) {
  .tool-wrapper { padding: 15px; }
  .control-bar { flex-direction: column; align-items: stretch; gap: 15px; }
  .actions { justify-content: space-between; margin-left: 0; width: 100%; }
  .btn-primary, .btn-secondary { flex: 1; justify-content: center; }
  
  .two-pane { grid-template-columns: 1fr; }
  .input-area { height: 250px; }
  .diff-pane { height: 400px; }
  .legend-item.note { margin-left: 0; width: 100%; margin-top: 5px; }
}

/* =========================================
   Advanced Usability Enhancements
   ========================================= */

/* File Input Custom Labels */
.btn-file-label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--c-border);
  border-radius: 4px;
  font-size: 0.75rem;
  padding: 4px 10px;
  cursor: pointer;
  color: var(--c-text-sub);
  font-weight: bold;
  background: transparent;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
}
.btn-file-label:hover {
  background: var(--c-bg);
  color: var(--c-primary);
  border-color: var(--c-primary);
  transform: translateY(-1px);
}
.btn-file-label:active {
  transform: translateY(0);
}

/* Input Area Drag and Drop */
.input-area {
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.input-area.drag-over {
  border-color: var(--c-primary) !important;
  background-color: rgba(59, 130, 246, 0.04) !important;
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15) !important;
}
@media (prefers-color-scheme: dark) {
  .input-area.drag-over {
    background-color: rgba(96, 165, 250, 0.08) !important;
  }
}

/* Diff Stats Badge & Jump Controls */
.diff-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--c-input-bg);
  border: 1px solid var(--c-border);
  border-radius: 30px;
  padding: 4px 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
  box-sizing: border-box;
}
.diff-stat {
  font-size: 0.8rem;
  font-weight: bold;
  display: inline-flex;
  gap: 6px;
  align-items: center;
}
.diff-stat .add-count {
  color: var(--c-diff-add-text);
  background: var(--c-diff-add-bg);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.72rem;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.diff-stat .del-count {
  color: var(--c-diff-del-text);
  background: var(--c-diff-del-bg);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.72rem;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.jump-group {
  display: flex;
  gap: 4px;
  border-left: 1px solid var(--c-border);
  padding-left: 8px;
  align-items: center;
}
.btn-jump { background: var(--c-card-bg); border: 1px solid var(--c-border); color: var(--c-text-sub); width: 44px; height: 44px; padding: 0;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.65rem;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 0;
  box-sizing: border-box;
}
.btn-jump:hover {
  background: var(--c-primary);
  color: white;
  border-color: var(--c-primary);
  transform: scale(1.1);
}
.btn-jump:active {
  transform: scale(0.95);
}

/* Diff Unified Copy Tool */
.btn-copy-diff {
  background: var(--c-input-bg);
  border: 1px solid var(--c-border);
  color: var(--c-text-main);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.btn-copy-diff:hover {
  background: var(--c-bg);
  border-color: var(--c-primary);
  color: var(--c-primary);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.08);
}
.btn-copy-diff:active {
  transform: translateY(1px);
}

/* =========================================
   Ultimate Polish Keyframe Animations
   ========================================= */

/* 行全体のパルス発光（ジャンプ用） */
.diff-line.pulse-highlight {
  animation: pulseHighlight 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes pulseHighlight {
  0% {
    background-color: rgba(59, 130, 246, 0.4);
  }
  30% {
    background-color: rgba(59, 130, 246, 0.25);
  }
  100% {
    background-color: transparent;
  }
}

/* 入力枠の成功グリーンフラッシュ */
.input-area.flash-success {
  animation: borderFlash 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes borderFlash {
  0% {
    border-color: #22c55e !important;
    box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.25) !important;
    background-color: rgba(34, 197, 94, 0.03) !important;
  }
  50% {
    border-color: #22c55e !important;
    box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.15) !important;
  }
  100% {
    border-color: var(--c-border);
    box-shadow: none;
    background-color: var(--c-input-bg);
  }
}

/* ファイルインフォバッジ（安心トースト） */
.file-info-badge {
  background: rgba(34, 197, 94, 0.12);
  color: #16a34a;
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: 20px;
  font-size: 0.7rem;
  padding: 3px 10px;
  font-weight: bold;
  display: inline-flex;
  align-items: center;
  animation: badgeSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  margin-right: auto;
  pointer-events: none;
  box-sizing: border-box;
}
@keyframes badgeSlideIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* レスポンシブStickyの微調整 */
@media (max-width: 768px) {
  .result-header {
    position: static; /* モバイルでは押しやすさのためスクロール追従を解除 */
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 15px;
  }
  .result-actions {
    flex-wrap: wrap;
    justify-content: space-between;
  }
  .diff-nav {
    width: 100%;
    justify-content: space-between;
  }
}

/* =========================================
   Diff Viewer Grid & Split View Styles
   ========================================= */
.diff-viewer {
  margin-top: 15px;
}
.split-view {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 768px) {
  .split-view {
    grid-template-columns: 1fr;
    gap: 15px;
  }
}