/* Reset and Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #858585;
    --accent: #7c3aed;
    --accent-hover: #6d28d9;
    --border: #3e3e42;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
}

/* Login Screen */
.login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: linear-gradient(135deg, #1e1e2e 0%, #2d2d44 100%);
}

.login-box {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-logout {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: white;
    width: 100%;
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.btn-logout {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

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

.error {
    color: var(--error);
    margin-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
}

/* Main App */
.main-app {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.search-box {
    padding: 1rem;
}

.search-box input {
    width: 100%;
    padding: 0.6rem 0.8rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent);
}

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

.sidebar-section h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.file-list {
    list-style: none;
}

.file-list li {
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-list li:hover {
    background: var(--bg-tertiary);
}

.file-tree {
    font-size: 0.9rem;
}

.tree-item {
    padding: 0.4rem 0.75rem;
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.tree-item.folder {
    font-weight: 500;
}

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

.tree-children {
    margin-left: 1rem;
}

.tree-icon {
    font-size: 0.8rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

.content-header {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.breadcrumb {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.content-view,
.content-editor {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

.content-editor {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.95rem;
    line-height: 1.7;
    resize: none;
    border: none;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.content-editor:focus {
    outline: none;
}

/* Markdown Content */
.markdown-body {
    max-width: 800px;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.markdown-body h1 {
    font-size: 2rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.markdown-body h2 {
    font-size: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.3rem;
}

.markdown-body h3 {
    font-size: 1.25rem;
}

.markdown-body p {
    margin-bottom: 1rem;
}

.markdown-body a {
    color: var(--accent);
    text-decoration: none;
}

.markdown-body a:hover {
    text-decoration: underline;
}

.markdown-body code {
    background: var(--bg-tertiary);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9em;
}

.markdown-body pre {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 1rem;
}

.markdown-body pre code {
    background: none;
    padding: 0;
}

.markdown-body ul,
.markdown-body ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.markdown-body li {
    margin-bottom: 0.5rem;
}

.markdown-body blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
}

.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.markdown-body th,
.markdown-body td {
    border: 1px solid var(--border);
    padding: 0.5rem;
}

.markdown-body th {
    background: var(--bg-secondary);
}

.markdown-body img {
    max-width: 100%;
    border-radius: 6px;
}

.placeholder {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.placeholder h2 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        left: -280px;
        height: 100%;
        z-index: 100;
        transition: left 0.3s;
    }

    .sidebar.open {
        left: 0;
    }

    .content-view,
    .content-editor {
        padding: 1rem;
    }
}

/* Loading */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Search Results */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-top: 0.5rem;
    max-height: 400px;
    overflow-y: auto;
    z-index: 100;
    display: none;
}

.search-results.active {
    display: block;
}

.search-result-item {
    padding: 0.75rem;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
}

.search-result-item:hover {
    background: var(--bg-tertiary);
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-title {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.search-result-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* === Loading Overlay === */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.loading-overlay.hidden {
    display: none;
}

.loading-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid #333;
    border-top-color: #4a9eff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-text {
    margin-top: 1rem;
    color: var(--text-primary);
    font-size: 0.9rem;
}