/* Light Theme - Classic high contrast */
:root,
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f5;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;
    --border-color: #dee2e6;
    --border-hover: #ced4da;
    --accent: #0d6efd;
    --accent-hover: #0b5ed7;
    --accent-light: #e7f1ff;
    --code-bg: #f8f9fa;
    --code-border: #e9ecef;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-sm: 6px;
}

/* Dark Theme - Reduces eye strain in low light */
[data-theme="dark"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --text-tertiary: #6e7681;
    --border-color: #30363d;
    --border-hover: #484f58;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --accent-light: #1c2128;
    --code-bg: #161b22;
    --code-border: #21262d;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
}

/* Gray Theme - Neutral, balanced, modern */
[data-theme="gray"] {
    --bg-primary: #e8e8e8;
    --bg-secondary: #d5d5d5;
    --bg-tertiary: #c2c2c2;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-tertiary: #6a6a6a;
    --border-color: #b8b8b8;
    --border-hover: #a5a5a5;
    --accent: #4a90e2;
    --accent-hover: #357abd;
    --accent-light: #d5e5f5;
    --code-bg: #d5d5d5;
    --code-border: #b8b8b8;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.08);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.12), 0 1px 2px -1px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.12), 0 2px 4px -2px rgba(0, 0, 0, 0.12);
}

/* Dark Gray Theme - Darker neutral gray, easier on eyes in low light */
[data-theme="darkgray"] {
    --bg-primary: #2a2a2a;
    --bg-secondary: #3a3a3a;
    --bg-tertiary: #4a4a4a;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border-color: #5a5a5a;
    --border-hover: #6a6a6a;
    --accent: #5a9de2;
    --accent-hover: #4a8dd2;
    --accent-light: #2a3a4a;
    --code-bg: #3a3a3a;
    --code-border: #4a4a4a;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
}

/* Sepia Theme - Warm tones, reduces blue light, easier on eyes */
[data-theme="sepia"] {
    --bg-primary: #f4ecd8;
    --bg-secondary: #e8dcc4;
    --bg-tertiary: #dcc8a8;
    --text-primary: #3e2723;
    --text-secondary: #5d4037;
    --text-tertiary: #8d6e63;
    --border-color: #d7c5b0;
    --border-hover: #c4b09a;
    --accent: #8b6914;
    --accent-hover: #6b4f0f;
    --accent-light: #f0e6d2;
    --code-bg: #e8dcc4;
    --code-border: #d7c5b0;
    --shadow-sm: 0 1px 2px 0 rgba(62, 39, 35, 0.1);
    --shadow: 0 1px 3px 0 rgba(62, 39, 35, 0.15), 0 1px 2px -1px rgba(62, 39, 35, 0.15);
    --shadow-md: 0 4px 6px -1px rgba(62, 39, 35, 0.15), 0 2px 4px -2px rgba(62, 39, 35, 0.15);
}

/* Solarized Light Theme - Scientifically designed for readability */
[data-theme="solarizedlight"] {
    --bg-primary: #fdf6e3;
    --bg-secondary: #eee8d5;
    --bg-tertiary: #e0ddd0;
    --text-primary: #586e75;
    --text-secondary: #657b83;
    --text-tertiary: #839496;
    --border-color: #d3c9b0;
    --border-hover: #c4b89a;
    --accent: #268bd2;
    --accent-hover: #1e6fa8;
    --accent-light: #e8e0d0;
    --code-bg: #eee8d5;
    --code-border: #d3c9b0;
    --shadow-sm: 0 1px 2px 0 rgba(88, 110, 117, 0.1);
    --shadow: 0 1px 3px 0 rgba(88, 110, 117, 0.15), 0 1px 2px -1px rgba(88, 110, 117, 0.15);
    --shadow-md: 0 4px 6px -1px rgba(88, 110, 117, 0.15), 0 2px 4px -2px rgba(88, 110, 117, 0.15);
}

/* Solarized Dark Theme - Scientifically designed dark theme */
[data-theme="solarizeddark"] {
    --bg-primary: #002b36;
    --bg-secondary: #073642;
    --bg-tertiary: #0d4a5a;
    --text-primary: #93a1a1;
    --text-secondary: #839496;
    --text-tertiary: #657b83;
    --border-color: #1a4a5a;
    --border-hover: #2a5a6a;
    --accent: #2aa198;
    --accent-hover: #1e8078;
    --accent-light: #073642;
    --code-bg: #073642;
    --code-border: #1a4a5a;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
}

/* Warm Theme - Soft warm tones, reduces blue light */
[data-theme="warm"] {
    --bg-primary: #fef9e7;
    --bg-secondary: #fef3c7;
    --bg-tertiary: #fde68a;
    --text-primary: #78350f;
    --text-secondary: #92400e;
    --text-tertiary: #b45309;
    --border-color: #fcd34d;
    --border-hover: #fbbf24;
    --accent: #d97706;
    --accent-hover: #b45309;
    --accent-light: #fef3c7;
    --code-bg: #fef3c7;
    --code-border: #fcd34d;
    --shadow-sm: 0 1px 2px 0 rgba(120, 53, 15, 0.1);
    --shadow: 0 1px 3px 0 rgba(120, 53, 15, 0.15), 0 1px 2px -1px rgba(120, 53, 15, 0.15);
    --shadow-md: 0 4px 6px -1px rgba(120, 53, 15, 0.15), 0 2px 4px -2px rgba(120, 53, 15, 0.15);
}

/* Midnight Theme - Deep blue-black, easy on eyes */
[data-theme="midnight"] {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --text-primary: #eaeaea;
    --text-secondary: #c4c4c4;
    --text-tertiary: #a0a0a0;
    --border-color: #2a2a4e;
    --border-hover: #3a3a5e;
    --accent: #4a9eff;
    --accent-hover: #3a8eef;
    --accent-light: #16213e;
    --code-bg: #16213e;
    --code-border: #2a2a4e;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
}

/* High Contrast Theme - Maximum readability, black on yellow */
[data-theme="highcontrast"] {
    --bg-primary: #ffff00;
    --bg-secondary: #ffff66;
    --bg-tertiary: #ffff99;
    --text-primary: #000000;
    --text-secondary: #333300;
    --text-tertiary: #666600;
    --border-color: #000000;
    --border-hover: #333300;
    --accent: #0000ff;
    --accent-hover: #0000cc;
    --accent-light: #ffff66;
    --code-bg: #ffff66;
    --code-border: #000000;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.2s ease, color 0.2s ease;
    overflow: hidden;
    height: 100vh;
}

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

/* Top Bar */
.top-bar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.top-bar-content {
    max-width: 100%;
    margin: 0;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 16px;
    color: var(--text-primary);
}

.logo svg {
    color: var(--accent);
}

.top-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-group label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.select-input {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.select-input:hover {
    border-color: var(--border-hover);
}

.select-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

/* Main Container */
.main-container {
    flex: 1;
    display: flex;
    overflow: hidden;
    gap: 0;
    background: var(--border-color);
    position: relative;
}

.main-container.layout-split {
    flex-direction: row;
}

.main-container.layout-editor .preview-panel,
.main-container.layout-editor .splitter {
    display: none;
}

.main-container.layout-preview .editor-panel,
.main-container.layout-preview .splitter {
    display: none;
}

/* Resizable Splitter */
.splitter {
    width: 4px;
    background: var(--border-color);
    cursor: col-resize;
    position: relative;
    flex-shrink: 0;
    transition: background 0.2s ease;
    z-index: 10;
}

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

.splitter::before {
    content: '';
    position: absolute;
    left: -2px;
    right: -2px;
    top: 0;
    bottom: 0;
    cursor: col-resize;
}

.splitter.resizing {
    background: var(--accent);
}

/* Panels */
.panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    overflow: hidden;
    min-width: 200px;
}

.editor-panel {
    flex: 0 0 50%;
}

.preview-panel {
    flex: 0 0 50%;
}

.panel-header {
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-title svg {
    color: var(--text-secondary);
}

.panel-actions {
    display: flex;
    gap: 8px;
}

.panel-content {
    flex: 1;
    overflow: auto;
    padding: 0;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

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

/* Input Section */
.input-section {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.input-wrapper {
    padding: 20px;
    display: flex;
    gap: 12px;
}

.text-input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s ease;
}

.text-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.editor-textarea {
    width: 100%;
    height: 100%;
    padding: 20px;
    border: none;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
    line-height: 1.7;
    resize: none;
    outline: none;
    tab-size: 2;
}

/* Markdown Preview */
.markdown-body {
    padding: 40px;
    max-width: 900px;
    margin: 0 auto;
    word-wrap: break-word;
    background: var(--bg-primary);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty-state svg {
    margin-bottom: 20px;
    color: var(--text-tertiary);
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Markdown Styles */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: 32px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-primary);
}

.markdown-body h1 {
    font-size: 2.25em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.3em;
    margin-top: 0;
}

.markdown-body h2 {
    font-size: 1.75em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}

.markdown-body h3 {
    font-size: 1.5em;
}

.markdown-body p {
    margin-bottom: 16px;
    color: var(--text-primary);
}

.markdown-body a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

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

.markdown-body code {
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 4px;
    padding: 2px 6px;
    font-size: 0.9em;
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
    color: var(--text-primary);
}

.markdown-body pre {
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: var(--radius-sm);
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 16px;
    line-height: 1.6;
}

.markdown-body pre code {
    background: transparent;
    border: none;
    padding: 0;
    font-size: 0.875em;
    color: inherit;
}

.markdown-body blockquote {
    border-left: 4px solid var(--accent);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
}

.markdown-body ul,
.markdown-body ol {
    margin-bottom: 16px;
    padding-left: 30px;
    color: var(--text-primary);
}

.markdown-body li {
    margin-bottom: 8px;
}

.markdown-body table {
    border-collapse: collapse;
    width: 100%;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.markdown-body table th,
.markdown-body table td {
    border: 1px solid var(--border-color);
    padding: 12px;
    text-align: left;
}

.markdown-body table th {
    background: var(--bg-secondary);
    font-weight: 600;
}

.markdown-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    margin: 16px 0;
}

.markdown-body hr {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 32px 0;
}

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    font-size: 14px;
}

.error {
    background: #f85149;
    color: white;
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    margin: 20px;
    font-size: 14px;
    line-height: 1.6;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

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

/* Responsive */
@media (max-width: 768px) {
    .main-container.layout-split {
        flex-direction: column;
    }
    
    .top-bar-content {
        flex-wrap: wrap;
        padding: 10px 16px;
    }
    
    .top-controls {
        width: 100%;
        justify-content: space-between;
    }
    
    .markdown-body {
        padding: 24px;
    }
    
    .panel-header {
        padding: 10px 16px;
    }
    
    .input-wrapper {
        padding: 16px;
    }
    
    .editor-textarea {
        padding: 16px;
    }
}

/* Highlight.js themes for different color schemes */
[data-theme="dark"] .hljs {
    background: #161b22 !important;
    color: #c9d1d9 !important;
}

[data-theme="gray"] .hljs {
    background: #d5d5d5 !important;
    color: #1a1a1a !important;
}

[data-theme="darkgray"] .hljs {
    background: #3a3a3a !important;
    color: #e0e0e0 !important;
}

[data-theme="sepia"] .hljs {
    background: #e8dcc4 !important;
    color: #3e2723 !important;
}

[data-theme="solarizedlight"] .hljs {
    background: #eee8d5 !important;
    color: #586e75 !important;
}

[data-theme="solarizeddark"] .hljs {
    background: #073642 !important;
    color: #93a1a1 !important;
}

[data-theme="warm"] .hljs {
    background: #fef3c7 !important;
    color: #78350f !important;
}

[data-theme="midnight"] .hljs {
    background: #16213e !important;
    color: #eaeaea !important;
}

[data-theme="highcontrast"] .hljs {
    background: #ffff66 !important;
    color: #000000 !important;
}