:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --border: #4d4d4d;
    --accent: #007acc;
    --accent-hover: #0099ff;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

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

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

.title-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.app-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.version-badge {
    background: var(--accent);
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.toolbar {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.toolbar-button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.toolbar-button:hover {
    background: var(--bg-primary);
    border-color: var(--accent);
}

.toolbar-button:active {
    transform: translateY(1px);
}

/* メインエリア */
.main-area {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--border);
    overflow: hidden;
}

.editor-pane {
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
}

.preview-pane {
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
}

.pane-header {
    background: var(--bg-secondary);
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.editor-textarea {
    flex: 1;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    outline: none;
    padding: 1rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: none;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-y: auto;
}

.editor-textarea::placeholder {
    color: var(--text-muted);
}

.preview-content {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    background: var(--bg-primary);
}

.preview-content h1,
.preview-content h2,
.preview-content h3,
.preview-content h4,
.preview-content h5,
.preview-content h6 {
    margin: 1.5rem 0 0.75rem 0;
    color: var(--text-primary);
    line-height: 1.3;
}

.preview-content h1 { font-size: 2rem; }
.preview-content h2 { font-size: 1.5rem; }
.preview-content h3 { font-size: 1.25rem; }
.preview-content h4 { font-size: 1rem; }
.preview-content h5 { font-size: 0.875rem; }
.preview-content h6 { font-size: 0.75rem; }

.preview-content p {
    margin: 0.75rem 0;
    line-height: 1.6;
    color: var(--text-primary);
}

.preview-content ul,
.preview-content ol {
    margin: 0.75rem 0 0.75rem 1.5rem;
    color: var(--text-primary);
}

.preview-content li {
    margin: 0.25rem 0;
}

.preview-content blockquote {
    border-left: 4px solid var(--accent);
    margin: 1rem 0;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-style: italic;
}

.preview-content code {
    background: var(--bg-secondary);
    color: var(--accent);
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
}

.preview-content pre {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 1rem 0;
    border: 1px solid var(--border);
}

.preview-content pre code {
    background: none;
    color: var(--text-primary);
    padding: 0;
}

.preview-content a {
    color: var(--accent);
    text-decoration: underline;
}

.preview-content a:hover {
    color: var(--accent-hover);
}

/* フッター */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.875rem;
}

.stats-section {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

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

.stat-value {
    color: var(--text-primary);
    font-weight: 500;
}

.actions-section {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.action-button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

.action-button:hover {
    background: var(--accent);
    border-color: var(--accent);
}

.action-button.danger:hover {
    background: var(--danger);
    border-color: var(--danger);
}

/* レスポンシブ対応 */
@media (max-width: 980px) {
    .main-area {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }

    .toolbar {
        order: 3;
        width: 100%;
        justify-content: center;
    }

    .header {
        flex-direction: column;
        align-items: stretch;
    }

    .title-section {
        justify-content: center;
    }
}

@media (max-width: 640px) {
    .footer {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .stats-section {
        justify-content: center;
    }

    .actions-section {
        justify-content: center;
    }
}

/* 印刷用CSS */
@media print {
    .app-container {
        height: auto;
    }

    .header,
    .footer,
    .editor-pane {
        display: none !important;
    }

    .main-area {
        display: block;
        background: white;
    }

    .preview-pane {
        background: white;
    }

    .pane-header {
        display: none;
    }

    .preview-content {
        color: black;
        padding: 0;
        overflow: visible;
        background: white;
    }

    .preview-content h1,
    .preview-content h2,
    .preview-content h3,
    .preview-content h4,
    .preview-content h5,
    .preview-content h6 {
        color: black;
    }

    .preview-content p {
        color: black;
    }

    .preview-content ul,
    .preview-content ol {
        color: black;
    }

    .preview-content blockquote {
        border-left: 4px solid #666;
        background: #f5f5f5;
        color: #333;
    }

    .preview-content code {
        background: #f5f5f5;
        color: #333;
        border: 1px solid #ddd;
    }

    .preview-content pre {
        background: #f5f5f5;
        color: black;
        border: 1px solid #ddd;
    }

    .preview-content pre code {
        color: black;
    }
}