* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-app: #1e1e1e;
    --bg-pane: #252526;
    --bg-header: #333333;
    --text-primary: #d4d4d4;
    --text-secondary: #808080;
    --border: #3c3c3c;
    --accent: #0e639c;
    --accent-hover: #1177bb;
    --added-bg: rgba(35, 134, 54, 0.2);
    --added-text: #3fb950;
    --removed-bg: rgba(248, 81, 73, 0.2);
    --removed-text: #f85149;
    --unchanged-bg: transparent;
    --line-number-bg: #2d2d2d;
}

body {
    font-family: 'Consolas', 'Monaco', monospace;
    background: var(--bg-app);
    color: var(--text-primary);
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 0.5rem;
}

.header h1 {
    font-size: 1rem;
    font-weight: 500;
}

.header-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.view-toggle {
    display: flex;
    background: var(--bg-pane);
    border-radius: 4px;
    overflow: hidden;
}

.view-btn {
    padding: 0.4rem 0.8rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

.view-btn.active {
    background: var(--accent);
    color: white;
}

.btn-primary, .btn-secondary {
    padding: 0.4rem 0.8rem;
    border: none;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-pane);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

.main-content {
    flex: 1;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* 入力グリッド */
.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.input-section {
    background: var(--bg-pane);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-radius: 6px 6px 0 0;
}

.paste-btn {
    padding: 0.2rem 0.5rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text-secondary);
    font-size: 0.7rem;
    cursor: pointer;
}

.paste-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

textarea {
    flex: 1;
    min-height: 150px;
    padding: 0.75rem;
    background: var(--bg-pane);
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
}

textarea::placeholder {
    color: var(--text-secondary);
}

/* 比較バー */
.compare-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.compare-options {
    display: flex;
    gap: 0.75rem;
}

.stats {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
}

.stat {
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
}

.stat.added {
    background: var(--added-bg);
    color: var(--added-text);
}

.stat.removed {
    background: var(--removed-bg);
    color: var(--removed-text);
}

.stat.unchanged {
    color: var(--text-secondary);
}

/* 結果セクション */
.result-section {
    flex: 1;
    background: var(--bg-pane);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    min-height: 300px;
}

.result-controls {
    display: flex;
    gap: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox-label input {
    cursor: pointer;
}

/* Diff表示 */
.diff-view {
    flex: 1;
    overflow: auto;
    font-size: 0.85rem;
    line-height: 1.5;
}

.diff-view.hidden {
    display: none;
}

.diff-placeholder {
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
}

/* 並列表示 */
.side-by-side {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-width: max-content;
}

.side-column {
    border-right: 1px solid var(--border);
}

.side-column:last-child {
    border-right: none;
}

/* 行 */
.diff-line {
    display: flex;
    min-height: 1.5em;
}

.diff-line.added {
    background: var(--added-bg);
}

.diff-line.removed {
    background: var(--removed-bg);
}

.diff-line.unchanged.hide-unchanged {
    display: none;
}

.line-number {
    min-width: 3rem;
    padding: 0 0.5rem;
    background: var(--line-number-bg);
    color: var(--text-secondary);
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--border);
}

.line-number.hide-numbers {
    display: none;
}

.line-content {
    flex: 1;
    padding: 0 0.5rem;
    white-space: pre;
}

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

.line-content.removed {
    color: var(--removed-text);
}

.line-marker {
    width: 1.5rem;
    text-align: center;
    font-weight: bold;
}

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

.line-marker.removed {
    color: var(--removed-text);
}

/* インライン表示 */
.inline-diff .diff-line {
    padding-left: 0.5rem;
}

/* フッター */
.footer {
    padding: 0.5rem 1rem;
    background: var(--bg-header);
    border-top: 1px solid var(--border);
    font-size: 0.7rem;
    color: var(--text-secondary);
}

/* トースト */
.toast {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    background: var(--added-text);
    color: var(--bg-app);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.2s;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* ナビゲーションハイライト */
.diff-line.highlight-flash {
    animation: flashHighlight 1s ease-out;
}

@keyframes flashHighlight {
    0% { background: var(--accent); }
    100% { background: transparent; }
}

/* レスポンシブ */
@media (max-width: 768px) {
    .input-grid {
        grid-template-columns: 1fr;
    }

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

    .header-controls {
        width: 100%;
        justify-content: flex-end;
    }
}