/* CSS Variables for theming */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #0066cc;
    --accent-hover: #0052a3;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --accent-color: #4da6ff;
    --accent-hover: #3399ff;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Modal Styles */
#filename-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

#filename-modal[style*="flex"] .modal-content {
    transform: scale(1);
}

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

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-header h3 i {
    color: var(--accent-color);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-body label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.filename-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s ease;
    font-family: inherit;
}

.filename-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.filename-preview {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 6px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.filename-preview strong {
    color: var(--accent-color);
    font-weight: 600;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    background: var(--bg-secondary);
}

.modal-footer .btn {
    min-width: 100px;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    z-index: 100;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.header h1 i {
    margin-right: 0.5rem;
    color: var(--accent-color);
}

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

.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-weight: 500;
}

.github-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.github-link i {
    font-size: 1.25rem;
}

.github-link span {
    font-size: 0.875rem;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 6px;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--accent-color);
    color: white;
}

/* Main container */
.main-container {
    display: flex;
    height: calc(100vh - 80px);
    overflow: hidden;
}

/* Panels */
.editor-panel,
.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
}

.editor-panel {
    border-right: 1px solid var(--border-color);
}

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

.panel-header h3 {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.panel-header h3 i {
    margin-right: 0.5rem;
    color: var(--accent-color);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

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

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

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

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

.editor-buttons,
.export-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Textarea */
#markdown-input {
    flex: 1;
    padding: 1.5rem;
    border: none;
    outline: none;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: none;
    white-space: pre-wrap;
    word-wrap: break-word;
}

#markdown-input::placeholder {
    color: var(--text-secondary);
}

/* Editor footer */
.editor-footer {
    padding: 0.75rem 1.5rem;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.word-count {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
}

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

/* Preview content styling */
.preview-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.preview-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.25rem;
}

.preview-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.preview-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.preview-content h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.preview-content h6 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.preview-content p {
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.6;
}

.preview-content ul,
.preview-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.preview-content li {
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.preview-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.preview-content em {
    font-style: italic;
    color: var(--text-primary);
}

.preview-content code {
    background-color: var(--bg-secondary);
    padding: 0.125rem 0.25rem;
    border-radius: 3px;
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.preview-content pre {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.preview-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.preview-content blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
    margin: 1rem 0;
    font-style: italic;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 0 6px 6px 0;
}

.preview-content a {
    color: var(--accent-color);
    text-decoration: none;
}

.preview-content a:hover {
    text-decoration: underline;
}

.preview-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.preview-content th,
.preview-content td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
}

.preview-content th {
    background-color: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

.preview-content td {
    color: var(--text-primary);
}

.preview-content hr {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 2rem 0;
}

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

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

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

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

/* Responsive design */
@media (max-width: 1024px) {
    .header h1 {
        font-size: 1.25rem;
    }

    .github-link span {
        display: none;
    }

    .editor-buttons,
    .export-buttons {
        gap: 0.25rem;
    }

    .btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 1.2rem;
    }

    .header-right span {
        display: none;
        /* Hide "GitHub" text on mobile */
    }

    .main-container {
        flex-direction: column;
    }

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

    .editor-buttons,
    .export-buttons {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.6rem;
    }

    .filename-input {
        font-size: 1rem;
    }

    .modal-content {
        margin: 1rem;
        max-height: 90vh;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0.5rem 1rem;
    }

    .btn {
        font-size: 0.75rem;
        padding: 0.3rem 0.5rem;
    }

    .btn i {
        margin-right: 0.25rem;
    }
}

/* Print styles for PDF export */
@media print {
    body {
        background: white;
        color: black;
    }

    .header,
    .panel-header,
    .editor-footer {
        display: none;
    }

    .main-container {
        height: auto;
    }

    .editor-panel {
        display: none;
    }

    .preview-panel {
        border: none;
    }

    .preview-content {
        padding: 0;
        overflow: visible;
    }
}

/* Statistics Modal Styles */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.stat-group {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
}

.stat-group h4 {
    margin: 0 0 1rem 0;
    color: var(--primary);
    font-size: 1rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-light);
}

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

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

.stat-value {
    color: var(--text);
    font-weight: 600;
    font-size: 0.9rem;
}

/* Statistics Modal Responsive */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .stat-group {
        padding: 0.75rem;
    }

    .stat-item {
        padding: 0.3rem 0;
    }

    .stat-label,
    .stat-value {
        font-size: 0.8rem;
    }
}