@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&family=Merriweather:wght@400;700&display=swap');

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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #121212;
    --bg-tertiary: #1a1a1a;
    --border-color: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #9e9e9e;
    --accent-primary: #9b59b6;
    --accent-secondary: #8e44ad;
    --accent-light: #bb6bd9;
    --accent-success: #27ae60;
    --accent-warning: #f39c12;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.4);
    --transition: 0.2s ease;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    flex-shrink: 0;
}

header h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

header h1::before {
    content: '◆ ';
    color: var(--accent-primary);
}

.header-buttons {
    display: flex;
    gap: 12px;
}

button {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

button:hover {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

#open-btn::before {
    content: '📂';
}

#save-btn::before {
    content: '💾';
}

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

/* Editor Panel */
.editor-panel {
    width: 50%;
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
}

#editor {
    flex: 1;
    width: 100%;
    padding: 20px;
    background-color: transparent;
    color: var(--text-primary);
    border: none;
    outline: none;
    resize: none;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 14px;
    line-height: 1.6;
    tab-size: 4;
}

#editor::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

#editor::-webkit-scrollbar,
#preview::-webkit-scrollbar {
    width: 8px;
}

#editor::-webkit-scrollbar-track,
#preview::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

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

#editor::-webkit-scrollbar-thumb:hover,
#preview::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Preview Panel */
.preview-panel {
    width: 50%;
    background-color: var(--bg-secondary);
    overflow-y: auto;
}

#preview {
    padding: 24px;
    font-family: 'Merriweather', Georgia, serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
}

/* Markdown Preview Styling */
#preview h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-primary);
}

#preview h2 {
    font-size: 24px;
    font-weight: 700;
    margin-top: 28px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

#preview h3 {
    font-size: 20px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

#preview h4 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 20px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

#preview h5, #preview h6 {
    font-size: 16px;
    font-weight: 600;
    margin-top: 16px;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

#preview p {
    margin-bottom: 16px;
}

#preview a {
    color: var(--accent-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition);
}

#preview a:hover {
    border-bottom-color: var(--accent-primary);
}

#preview strong {
    font-weight: 700;
    color: var(--text-primary);
}

#preview em {
    font-style: italic;
}

#preview code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    background-color: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    color: #f97583;
}

#preview pre {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 16px;
    margin: 16px 0;
    overflow-x: auto;
}

#preview pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.5;
}

#preview blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--text-secondary);
    font-style: italic;
}

#preview ul, #preview ol {
    margin: 16px 0;
    padding-left: 24px;
}

#preview li {
    margin-bottom: 8px;
}

#preview ul li::marker {
    color: var(--accent-primary);
}

#preview ol li::marker {
    color: var(--accent-primary);
    font-weight: 600;
}

#preview hr {
    border: none;
    height: 2px;
    background-color: var(--border-color);
    margin: 24px 0;
}

#preview img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 16px 0;
}

#preview table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}

#preview th, #preview td {
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    text-align: left;
}

#preview th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
}

#preview tr:nth-child(even) {
    background-color: rgba(33, 38, 45, 0.5);
}

/* Empty State */
#preview:empty::before {
    content: 'Preview will appear here...';
    color: var(--text-secondary);
    opacity: 0.5;
    font-style: italic;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    header {
        padding: 12px 16px;
    }

    header h1 {
        font-size: 18px;
    }

    button {
        padding: 8px 12px;
        font-size: 13px;
    }

    button span {
        display: none;
    }

    main {
        flex-direction: column;
    }

    .editor-panel, .preview-panel {
        width: 100%;
        height: 50%;
    }

    .editor-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    #preview {
        padding: 16px;
        font-size: 15px;
    }

    #editor {
        padding: 16px;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#preview > * {
    animation: fadeIn 0.3s ease;
}

/* Selection */
::selection {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

#editor::selection {
    background-color: rgba(88, 166, 255, 0.3);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--bg-secondary);
    margin: 5% auto;
    padding: 32px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 90%;
    max-width: 700px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-content h2 {
    color: var(--accent-primary);
    margin-bottom: 16px;
    font-size: 24px;
}

.modal-content > p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.modal-content ul {
    list-style: none;
    padding: 0;
}

.modal-content li {
    margin-bottom: 16px;
    padding: 12px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    border-left: 3px solid var(--accent-primary);
}

.modal-content li strong {
    color: var(--accent-light);
    display: block;
    margin-bottom: 6px;
}

.modal-content li ul {
    margin-top: 8px;
    margin-left: 16px;
}

.modal-content li li {
    margin-bottom: 6px;
    padding: 6px;
    background-color: transparent;
    border-left: none;
    border-radius: 0;
}

.modal-content code {
    font-family: 'JetBrains Mono', monospace;
    background-color: var(--bg-primary);
    padding: 2px 6px;
    border-radius: 4px;
    color: #f97583;
    font-size: 13px;
}

.modal-content pre {
    background-color: var(--bg-primary);
    padding: 12px;
    border-radius: 6px;
    margin-top: 8px;
    overflow-x: auto;
}

.modal-content pre code {
    display: block;
    line-height: 1.5;
}

/* Close Button */
.close {
    float: right;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition);
    line-height: 1;
}

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

/* Help Button */
#help-btn::before {
    content: '❓';
}

/* Modal list items with inline examples */
.modal-content li em {
    color: var(--accent-light);
    font-style: normal;
    display: block;
    margin-top: 4px;
    font-size: 13px;
}

.modal-content li code {
    display: inline-block;
    margin-top: 2px;
}