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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f9fafb;
    --surface-color: #ffffff;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* Dark mode theme */
[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #9ca3af;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #1a1a1a;
    --surface-color: #2d2d2d;
    --border-color: #404040;
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* Header */
header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--primary-color);
}

.header-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.status {
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    background-color: var(--bg-color);
    color: var(--text-secondary);
}

.status.connected {
    background-color: #dcfce7;
    color: #166534;
}

.status.error {
    background-color: #fee2e2;
    color: #991b1b;
}

/* Main Layout */
main {
    flex: 1;
    overflow: hidden;
}

.layout {
    display: flex;
    height: 100%;
    gap: 0;
}

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

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 0.375rem;
    transition: background-color 0.2s;
}

.btn-icon:hover {
    background-color: var(--bg-color);
}

.tree-container {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.tree-item {
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    border-radius: 0.375rem;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    user-select: none;
}

.tree-item:hover {
    background-color: var(--bg-color);
}

.tree-item.active {
    background-color: var(--primary-color);
    color: white;
}

.tree-item-icon {
    font-size: 1rem;
    min-width: 1.25rem;
}

.tree-item-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tree-nested {
    display: block;
}

.tree-item-toggle {
    display: inline-block;
    min-width: 1rem;
    text-align: center;
}

.loading {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

.view {
    display: none;
    flex: 1;
    overflow: hidden;
    flex-direction: column;
}

.view:not(.hidden) {
    display: flex;
}

.view.hidden {
    display: none;
}

/* File View */
.file-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--surface-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
}

.file-info {
    flex: 1;
}

.file-info h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.file-path {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-family: 'Monaco', 'Courier New', monospace;
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

.file-content {
    flex: 1;
    overflow: auto;
    padding: 1.5rem;
    background-color: var(--bg-color);
}

.file-content pre {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
}

.file-content code {
    color: var(--text-primary);
}

/* History View */
.history-content {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.history-item {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.history-item:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-revision {
    font-weight: 600;
    color: var(--primary-color);
    font-family: 'Monaco', 'Courier New', monospace;
}

.history-date {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.history-author {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.history-state {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    background-color: var(--bg-color);
    color: var(--text-secondary);
}

.history-lines {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* Diff View */
.view-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--surface-color);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.view-header h2 {
    flex: 1;
}

.diff-controls {
    padding: 1.5rem;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

.revision-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.revision-selector label {
    font-size: 0.875rem;
    font-weight: 500;
}

.revision-selector select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    background-color: var(--surface-color);
    cursor: pointer;
}

.diff-content {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    background-color: var(--bg-color);
}

.diff-content pre {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
}

.diff-line {
    margin: 0;
}

.diff-line.added {
    background-color: #dcfce7;
    color: #166534;
}

.diff-line.removed {
    background-color: #fee2e2;
    color: #991b1b;
}

.diff-line.context {
    color: var(--text-secondary);
}

.diff-line.header {
    background-color: var(--bg-color);
    color: var(--text-secondary);
    font-weight: 600;
}

/* Welcome View */
.welcome-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 3rem;
}

.welcome-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.welcome-content p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.125rem;
}

.features {
    text-align: left;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 2rem;
    max-width: 400px;
}

.features h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.features ul {
    list-style: none;
}

.features li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

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

.btn-secondary:hover {
    background-color: #4b5563;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: 200px;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .file-header {
        flex-direction: column;
    }

    .file-actions {
        width: 100%;
    }

    .file-actions .btn {
        flex: 1;
    }

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

    .revision-selector select {
        width: 100%;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}