:root {
    --bg-dark: #1E1E1E;
    --bg-darker: #181818;
    --bg-sidebar: #252526;
    --text-primary: #CCCCCC;
    --text-focus: #FFFFFF;
    --border-color: #3C3C3C;

    --current-bg: rgba(64, 200, 174, 0.2);
    --current-border: rgba(64, 200, 174, 0.5);
    --incoming-bg: rgba(79, 140, 255, 0.2);
    --incoming-border: rgba(79, 140, 255, 0.5);

    --marker-color: #569CD6;
    --accent: #007ACC;
    --accent-hover: #0062A3;

    --success: #4CAF50;
    --error: #F44336;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg-darker);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    overflow: hidden;
}

.app-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 300px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-focus);
}

.scenario-list {
    list-style: none;
    overflow-y: auto;
    flex: 1;
}

.scenario-item {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    cursor: pointer;
    transition: background 0.2s;
}

.scenario-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.scenario-item.active {
    background: rgba(255, 255, 255, 0.1);
    border-left: 4px solid var(--accent);
}

.scenario-item h3 {
    font-size: 0.95rem;
    color: var(--text-focus);
    margin-bottom: 0.25rem;
}

.scenario-item p {
    font-size: 0.8rem;
    color: #888;
}

.sidebar-footer {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.validation-result {
    padding: 0 1.5rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.validation-result.success {
    color: var(--success);
}

.validation-result.error {
    color: var(--error);
}

.btn {
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

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

.btn.secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topbar {
    padding: 1.5rem 2rem;
    background-color: var(--bg-dark);
    border-bottom: 1px solid var(--border-color);
}

.topbar h1 {
    font-size: 1.5rem;
    color: var(--text-focus);
    margin-bottom: 0.25rem;
}

.subtitle {
    color: #888;
    font-size: 0.9rem;
}

.editor-wrapper {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background-color: var(--bg-darker);
}

.editor-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
}

/* Blocks */
.normal-block {
    width: 100%;
}

textarea.code-area {
    width: 100%;
    background: transparent;
    color: #D4D4D4;
    font-family: 'Fira Code', monospace;
    font-size: 14px;
    line-height: 1.5;
    border: none;
    padding: 1rem;
    resize: vertical;
    outline: none;
    display: block;
}

textarea.code-area:focus {
    background: rgba(255, 255, 255, 0.02);
}

/* Conflict Block */
.conflict-block {
    display: flex;
    flex-direction: column;
    margin: 0;
}

.conflict-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 1rem;
    background: #2D2D2D;
    font-size: 0.8rem;
    font-family: 'Inter', sans-serif;
}

.action-btn {
    background: none;
    border: none;
    color: #888;
    cursor: pointer;
    transition: color 0.2s;
}

.action-btn:hover {
    color: var(--text-focus);
}

.action-btn.accept-current {
    color: #40C8AE;
}

.action-btn.accept-incoming {
    color: #4F8CFF;
}

.divider {
    color: #555;
}

.conflict-section {
    position: relative;
}

.conflict-section.current-change {
    background: var(--current-bg);
    border-left: 4px solid var(--current-border);
}

.conflict-section.incoming-change {
    background: var(--incoming-bg);
    border-left: 4px solid var(--incoming-border);
}

.conflict-marker {
    font-family: 'Fira Code', monospace;
    font-size: 13px;
    color: var(--marker-color);
    padding: 0.25rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    user-select: none;
}

.conflict-separator {
    font-family: 'Fira Code', monospace;
    font-size: 13px;
    color: #888;
    padding: 0.25rem 1rem;
    background: #2D2D2D;
    user-select: none;
}

.conflict-section textarea.code-area {
    padding: 0.5rem 1rem;
}