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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
}

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

header {
    background-color: #2c3e50;
    color: white;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

.header-icon {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.95rem;
    opacity: 0.9;
}

.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.input-section, .preview-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
    margin: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

.input-header, .preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #e0e0e0;
    background-color: #fafafa;
}

.input-header h2, .preview-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2c3e50;
}

.input-controls, .preview-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.style-select {
    padding: 0.5rem;
    border: 1px solid #d5dbdb;
    border-radius: 4px;
    font-size: 0.9rem;
    background-color: white;
    cursor: pointer;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: #3498db;
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-primary:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background-color: #ecf0f1;
    color: #2c3e50;
}

.btn-secondary:hover {
    background-color: #d5dbdb;
}

.markdown-input {
    flex: 1;
    padding: 1.5rem;
    border: none;
    resize: none;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    outline: none;
}

.file-name {
    padding: 0.5rem 1.5rem;
    background-color: #ecf0f1;
    font-size: 0.85rem;
    color: #7f8c8d;
    border-top: 1px solid #e0e0e0;
    display: none;
}

.file-name:not(:empty) {
    display: block;
}

.preview-content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background-color: white;
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #bdc3c7;
}

.preview-placeholder p {
    margin-top: 1rem;
    font-size: 0.95rem;
}

/* Notification styles */
.notification {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background-color: #2ecc71;
    color: white;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
}

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

.notification.error {
    background-color: #e74c3c;
}

/* PDF Preview Base Styles */
.pdf-preview {
    max-width: 8.5in;
    margin: 0 auto;
    padding: 0.75in;
    background: white;
}

/* Professional Style (Default) */
.pdf-preview.professional {
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 12pt;
    line-height: 1.6;
    color: #000000;
}

/* Academic Style */
.pdf-preview.academic {
    font-family: 'Times New Roman', serif;
    font-size: 11pt;
    line-height: 2.0;
    color: #000000;
}

/* Modern Style */
.pdf-preview.modern {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    font-size: 11pt;
    line-height: 1.5;
    color: #2c3e50;
}

/* Professional Style Headings */
.pdf-preview.professional h1 {
    font-size: 24pt;
    font-weight: bold;
    color: #000000;
    margin: 36pt 0 18pt 0;
    page-break-after: avoid;
    page-break-inside: avoid;
    border-bottom: 2pt solid #000000;
    padding-bottom: 6pt;
    text-align: left;
    orphans: 3;
    widows: 3;
}

.pdf-preview.professional h2 {
    font-size: 18pt;
    font-weight: bold;
    color: #000000;
    margin: 24pt 0 12pt 0;
    page-break-before: auto;
    page-break-after: avoid;
    page-break-inside: avoid;
    border-bottom: 1pt solid #666666;
    padding-bottom: 3pt;
    orphans: 3;
    widows: 3;
}

.pdf-preview.professional h3 {
    font-size: 14pt;
    font-weight: bold;
    color: #000000;
    margin: 18pt 0 9pt 0;
    page-break-after: avoid;
    page-break-inside: avoid;
    orphans: 3;
    widows: 3;
}

.pdf-preview.professional h4 {
    font-size: 12pt;
    font-weight: bold;
    color: #000000;
    margin: 15pt 0 6pt 0;
    page-break-after: avoid;
    page-break-inside: avoid;
    orphans: 3;
    widows: 3;
}

.pdf-preview.professional h5 {
    font-size: 11pt;
    font-weight: bold;
    color: #000000;
    margin: 12pt 0 6pt 0;
    page-break-after: avoid;
    page-break-inside: avoid;
    orphans: 3;
    widows: 3;
}

.pdf-preview.professional h6 {
    font-size: 10pt;
    font-weight: bold;
    color: #000000;
    margin: 9pt 0 6pt 0;
    page-break-after: avoid;
    page-break-inside: avoid;
    orphans: 3;
    widows: 3;
}

/* Professional Body Text */
.pdf-preview.professional p {
    margin: 0 0 12pt 0;
    text-align: justify;
    text-indent: 0;
    orphans: 3;
    widows: 3;
}

/* Professional Links */
.pdf-preview.professional a {
    color: #000000;
    text-decoration: underline;
}

/* Professional Inline Code */
.pdf-preview.professional code {
    font-family: 'Courier New', 'Consolas', monospace;
    font-size: 10pt;
    background-color: #f5f5f5;
    padding: 2pt 4pt;
    border: 1pt solid #e0e0e0;
}

/* Professional Code Blocks */
.pdf-preview.professional pre {
    font-family: 'Courier New', 'Consolas', monospace;
    font-size: 10pt;
    background-color: #f9f9f9;
    border: 1pt solid #d0d0d0;
    padding: 12pt;
    margin: 12pt 0;
    page-break-inside: avoid;
    white-space: pre-wrap;
    word-wrap: break-word;
    text-decoration: none;
}

.pdf-preview.professional pre code {
    background-color: transparent;
    border: none;
    padding: 0;
    font-size: inherit;
    text-decoration: none;
}

/* Professional Blockquotes */
.pdf-preview.professional blockquote {
    margin: 12pt 0 12pt 36pt;
    padding: 0 0 0 18pt;
    border-left: 3pt solid #cccccc;
    font-style: italic;
    color: #555555;
    page-break-inside: avoid;
}

/* Professional Lists */
.pdf-preview.professional ul {
    margin: 12pt 0;
    padding-left: 36pt;
    list-style-type: disc;
}

.pdf-preview.professional ol {
    margin: 12pt 0;
    padding-left: 36pt;
    list-style-type: decimal;
}

.pdf-preview.professional ul ul {
    list-style-type: circle;
    margin: 6pt 0;
}

.pdf-preview.professional ul ul ul {
    list-style-type: square;
}

.pdf-preview.professional ol ol {
    list-style-type: lower-alpha;
    margin: 6pt 0;
}

.pdf-preview.professional ol ol ol {
    list-style-type: lower-roman;
}

.pdf-preview.professional li {
    margin: 6pt 0;
    line-height: 1.5;
}

/* Professional Tables */
.pdf-preview.professional table {
    border-collapse: collapse;
    width: 100%;
    margin: 18pt 0;
    page-break-inside: avoid;
    font-size: 11pt;
}

.pdf-preview.professional th {
    background-color: #f0f0f0;
    font-weight: bold;
    padding: 8pt 12pt;
    border: 1pt solid #666666;
    text-align: left;
    vertical-align: top;
}

.pdf-preview.professional td {
    padding: 8pt 12pt;
    border: 1pt solid #999999;
    text-align: left;
    vertical-align: top;
}

.pdf-preview.professional tr:nth-child(even) td {
    background-color: #f9f9f9;
}

/* Professional Images */
.pdf-preview.professional img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 18pt auto;
    page-break-inside: avoid;
}

/* Professional Horizontal Rules */
.pdf-preview.professional hr {
    border: none;
    border-top: 1pt solid #666666;
    margin: 24pt 0;
    page-break-after: avoid;
}

/* Professional Page Break Controls */
.pdf-preview.professional h1 + * {
    page-break-before: avoid;
}

.pdf-preview.professional h2 + * {
    page-break-before: avoid;
}

.pdf-preview.professional h3 + *, 
.pdf-preview.professional h4 + *, 
.pdf-preview.professional h5 + *, 
.pdf-preview.professional h6 + * {
    page-break-before: avoid;
}

/* Academic Style - Traditional research paper formatting */
.pdf-preview.academic h1 { font-size: 18pt; font-weight: bold; text-align: center; margin: 24pt 0 18pt 0; page-break-after: avoid; }
.pdf-preview.academic h2 { font-size: 14pt; font-weight: bold; margin: 18pt 0 12pt 0; page-break-after: avoid; }
.pdf-preview.academic h3 { font-size: 12pt; font-weight: bold; margin: 15pt 0 9pt 0; page-break-after: avoid; }
.pdf-preview.academic h4 { font-size: 11pt; font-weight: bold; margin: 12pt 0 6pt 0; page-break-after: avoid; }
.pdf-preview.academic h5, .pdf-preview.academic h6 { font-size: 11pt; font-style: italic; margin: 9pt 0 6pt 0; page-break-after: avoid; }
.pdf-preview.academic p { margin: 0 0 12pt 0; text-align: justify; text-indent: 18pt; }
.pdf-preview.academic a { color: #000000; text-decoration: none; }
.pdf-preview.academic code { font-family: 'Courier New', monospace; font-size: 9pt; background-color: #f8f8f8; padding: 1pt 3pt; }
.pdf-preview.academic pre { font-family: 'Courier New', monospace; font-size: 9pt; background-color: #f8f8f8; border: 1pt solid #ccc; padding: 9pt; margin: 12pt 0; page-break-inside: avoid; white-space: pre-wrap; word-wrap: break-word; overflow-wrap: break-word; }
.pdf-preview.academic blockquote { margin: 12pt 0 12pt 36pt; font-style: italic; }
.pdf-preview.academic ul, .pdf-preview.academic ol { margin: 6pt 0; padding-left: 24pt; }
.pdf-preview.academic li { margin: 3pt 0; }
.pdf-preview.academic table { border-collapse: collapse; width: 100%; margin: 12pt 0; font-size: 10pt; }
.pdf-preview.academic th, .pdf-preview.academic td { border: 1pt solid #000; padding: 6pt 8pt; }
.pdf-preview.academic th { background-color: #f5f5f5; font-weight: bold; }
.pdf-preview.academic hr { border: none; border-top: 1pt solid #000; margin: 18pt 0; }

/* Modern Style - Clean, minimal design */
.pdf-preview.modern h1 { font-size: 28pt; font-weight: 300; color: #2c3e50; margin: 36pt 0 24pt 0; border-bottom: 2pt solid #3498db; padding-bottom: 12pt; page-break-after: avoid; }
.pdf-preview.modern h2 { font-size: 20pt; font-weight: 400; color: #34495e; margin: 24pt 0 12pt 0; page-break-after: avoid; }
.pdf-preview.modern h3 { font-size: 16pt; font-weight: 500; color: #34495e; margin: 18pt 0 9pt 0; page-break-after: avoid; }
.pdf-preview.modern h4 { font-size: 13pt; font-weight: 500; color: #34495e; margin: 15pt 0 6pt 0; page-break-after: avoid; }
.pdf-preview.modern h5, .pdf-preview.modern h6 { font-size: 12pt; font-weight: 500; color: #7f8c8d; margin: 12pt 0 6pt 0; page-break-after: avoid; }
.pdf-preview.modern p { margin: 0 0 15pt 0; text-align: left; }
.pdf-preview.modern a { color: #3498db; text-decoration: none; }
.pdf-preview.modern code { font-family: 'Monaco', 'Menlo', monospace; font-size: 10pt; background-color: #ecf0f1; padding: 3pt 6pt; border-radius: 3pt; }
.pdf-preview.modern pre { font-family: 'Monaco', 'Menlo', monospace; font-size: 10pt; background-color: #2c3e50; color: #ecf0f1; padding: 15pt; margin: 18pt 0; border-radius: 6pt; }
.pdf-preview.modern pre code { background-color: transparent; color: inherit; padding: 0; }
.pdf-preview.modern blockquote { margin: 18pt 0; padding: 12pt 18pt; background-color: #ecf0f1; border-left: 4pt solid #3498db; font-style: normal; }
.pdf-preview.modern ul, .pdf-preview.modern ol { margin: 12pt 0; padding-left: 24pt; }
.pdf-preview.modern li { margin: 6pt 0; }
.pdf-preview.modern table { border-collapse: collapse; width: 100%; margin: 18pt 0; font-size: 10pt; }
.pdf-preview.modern th { background-color: #34495e; color: white; font-weight: 500; padding: 12pt 15pt; border: none; }
.pdf-preview.modern td { padding: 12pt 15pt; border: none; border-bottom: 1pt solid #ecf0f1; }
.pdf-preview.modern tr:nth-child(even) td { background-color: #f8f9fa; }
.pdf-preview.modern hr { border: none; border-top: 1pt solid #bdc3c7; margin: 36pt 0; }

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}