:root {
    --bg-dark: #0f1115;
    --bg-panel: #161b22;
    --bg-panel-hover: #1c2128;
    --border-color: #30363d;
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --accent-color: #58a6ff;
    --accent-hover: #79c0ff;
    --danger-color: #f85149;
    --danger-hover: #ff7b72;
    --success-color: #238636;
    --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
}

[data-theme="light"] {
    --bg-dark: #f6f8fa;
    --bg-panel: #ffffff;
    --bg-panel-hover: #f3f4f6;
    --border-color: #d0d7de;
    --text-main: #24292f;
    --text-muted: #57606a;
    --accent-color: #0969da;
    --accent-hover: #0349b4;
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
    background: #afb8c1;
}
[data-theme="light"] ::-webkit-scrollbar-thumb:hover {
    background: #8c959f;
}

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

body {
    font-family: var(--font-ui);
    background-color: var(--bg-dark);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #30363d;
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: #484f58;
}

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

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--bg-dark);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    color: var(--text-main);
}

.logo i {
    color: var(--accent-color);
    font-size: 1.5rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.logo span {
    color: var(--accent-color);
    font-weight: 700;
}

/* Toolbar Buttons */
.toolbar {
    display: flex;
    gap: 0.75rem;
}

.btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--bg-panel);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover {
    background-color: var(--bg-panel-hover);
    border-color: #8b949e;
}

.btn i {
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--success-color);
    border-color: rgba(240, 246, 252, 0.1);
    color: white;
}

.btn-primary:hover {
    background-color: #2ea043;
    border-color: rgba(240, 246, 252, 0.1);
}

.btn-danger {
    padding: 0.5rem 0.75rem;
    color: var(--danger-color);
}

.btn-danger:hover {
    background-color: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

/* Main Layout */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

.pane {
    display: flex;
    flex-direction: column;
    min-width: 0; /* Prevents flex items from overflowing */
}

.editor-pane {
    width: 50%;
    flex: none;
}

.preview-pane {
    flex: 1;
}

.resizer {
    width: 6px;
    background-color: var(--bg-dark);
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    cursor: col-resize;
    transition: background-color 0.2s ease;
    z-index: 5;
    flex-shrink: 0;
}

.resizer:hover, .resizer:active {
    background-color: var(--accent-color);
}

.pane-header {
    padding: 0.5rem 1rem;
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

/* Editor */
#editor {
    flex: 1;
    width: 100%;
    resize: none;
    border: none;
    background-color: var(--bg-dark);
    color: var(--text-main);
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.6;
    outline: none;
    tab-size: 4;
}

/* Preview */
#preview {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background-color: var(--bg-dark);
}

/* Markdown Rendering Styles */
.markdown-body {
    font-family: var(--font-ui);
    line-height: 1.6;
    color: var(--text-main);
    word-wrap: break-word;
    max-width: 800px;
    margin: 0 auto;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
}

.markdown-body h1 { font-size: 2em; border-bottom: 1px solid var(--border-color); padding-bottom: .3em; }
.markdown-body h2 { font-size: 1.5em; border-bottom: 1px solid var(--border-color); padding-bottom: .3em; }
.markdown-body h3 { font-size: 1.25em; }
.markdown-body h4 { font-size: 1em; }

.markdown-body p,
.markdown-body blockquote,
.markdown-body ul,
.markdown-body ol,
.markdown-body dl,
.markdown-body table,
.markdown-body pre,
.markdown-body details {
    margin-top: 0;
    margin-bottom: 16px;
}

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

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

.markdown-body strong {
    font-weight: 600;
}

.markdown-body ul,
.markdown-body ol {
    padding-left: 2em;
}

.markdown-body blockquote {
    padding: 0 1em;
    color: var(--text-muted);
    border-left: 0.25em solid var(--border-color);
}

.markdown-body code {
    padding: 0.2em 0.4em;
    margin: 0;
    font-size: 85%;
    background-color: rgba(110, 118, 129, 0.4);
    border-radius: 6px;
    font-family: var(--font-mono);
}

.markdown-body pre {
    padding: 16px;
    overflow: auto;
    font-size: 85%;
    line-height: 1.45;
    background-color: var(--bg-panel);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.markdown-body pre code {
    display: inline;
    max-width: auto;
    padding: 0;
    margin: 0;
    overflow: visible;
    line-height: inherit;
    word-wrap: normal;
    background-color: transparent;
    border: 0;
}

.markdown-body table {
    display: block;
    width: 100%;
    width: max-content;
    max-width: 100%;
    overflow: auto;
    border-collapse: collapse;
}

.markdown-body table th,
.markdown-body table td {
    padding: 6px 13px;
    border: 1px solid var(--border-color);
}

.markdown-body table tr {
    background-color: var(--bg-dark);
    border-top: 1px solid var(--border-color);
}

.markdown-body table tr:nth-child(2n) {
    background-color: var(--bg-panel);
}

.markdown-body img {
    max-width: 100%;
    box-sizing: content-box;
    background-color: var(--bg-dark);
    border-radius: 6px;
}

.markdown-body hr {
    height: 0.25em;
    padding: 0;
    margin: 24px 0;
    background-color: var(--border-color);
    border: 0;
}

/* Notifications */
.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--success-color);
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 100;
}

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

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    .editor-pane {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    .btn span {
        display: none; /* Hide text on small screens */
    }
}

/* Print Styles for PDF Export */
@media print {
    body, .app-container, .main-content, .preview-pane {
        height: auto !important;
        overflow: visible !important;
        background-color: white !important;
        color: black !important;
    }
    
    .app-header, .editor-pane, .resizer, .pane-header, .notification {
        display: none !important;
    }

    #preview {
        overflow: visible !important;
        padding: 0 !important;
        background-color: white !important;
    }
    
    .markdown-body {
        max-width: 100% !important;
        color: black !important;
    }
    
    /* Ensure code blocks don't break across pages and text is selectable */
    pre, blockquote {
        page-break-inside: avoid;
    }
    
    /* Optionally force light theme colors for printing */
    .markdown-body pre {
        background-color: #f6f8fa !important;
        border: 1px solid #d0d7de !important;
    }
    
    .markdown-body code {
        color: #24292f !important;
    }
}