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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

.breadcrumb {
    padding: 20px 40px;
    background: #f8f9fa;
    border-bottom: 1px solid #e9ecef;
    font-size: 0.9em;
}

.breadcrumb a {
    color: #667eea;
    text-decoration: none;
    margin-right: 8px;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb a:not(:last-child)::after {
    content: ' / ';
    color: #6c757d;
    margin-left: 8px;
}

.search-box {
    padding: 20px 40px;
    background: white;
    border-bottom: 1px solid #e9ecef;
}

.search-box input {
    width: 100%;
    padding: 12px 20px;
    font-size: 1em;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    transition: border-color 0.3s;
}

.search-box input:focus {
    outline: none;
    border-color: #667eea;
}

.loading {
    padding: 60px;
    text-align: center;
    color: #6c757d;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    padding: 20px 40px;
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    color: #856404;
    margin: 20px 40px;
    border-radius: 4px;
}

.file-list {
    padding: 20px 40px;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid #e9ecef;
    transition: background-color 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.file-item:hover {
    background-color: #f8f9fa;
}

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

.file-icon {
    width: 48px;
    height: 48px;
    margin-right: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    background: #f8f9fa;
    border-radius: 8px;
    flex-shrink: 0;
}

.file-icon.folder {
    background: #e3f2fd;
    color: #1976d2;
}

.file-icon.file {
    background: #fff3e0;
    color: #f57c00;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: 1.1em;
    font-weight: 500;
    margin-bottom: 4px;
    word-break: break-word;
}

.file-meta {
    font-size: 0.85em;
    color: #6c757d;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.file-size {
    font-weight: 500;
}

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

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.empty-state {
    padding: 60px;
    text-align: center;
    color: #6c757d;
}

.empty-state-icon {
    font-size: 4em;
    margin-bottom: 20px;
    opacity: 0.5;
}

.btn-view {
    background: #28a745;
    color: white;
}

.btn-view:hover {
    background: #218838;
}

/* File Viewer Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.7);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: #fefefe;
    margin: 2% auto;
    border-radius: 12px;
    width: 90%;
    max-width: 1200px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid #e9ecef;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px 12px 0 0;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.5em;
    word-break: break-word;
    flex: 1;
    padding-right: 20px;
}

.modal-close {
    background: none;
    border: none;
    color: white;
    font-size: 2em;
    font-weight: bold;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.modal-close:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.modal-body {
    padding: 30px;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}

.viewer-loading {
    text-align: center;
    padding: 60px;
    color: #6c757d;
}

/* Markdown content styling */
.markdown-content {
    line-height: 1.6;
    color: #333;
}

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

.markdown-content h1 {
    font-size: 2em;
    border-bottom: 1px solid #eaecef;
    padding-bottom: 0.3em;
}

.markdown-content h2 {
    font-size: 1.5em;
    border-bottom: 1px solid #eaecef;
    padding-bottom: 0.3em;
}

.markdown-content p {
    margin-bottom: 16px;
}

.markdown-content ul,
.markdown-content ol {
    margin-bottom: 16px;
    padding-left: 2em;
}

.markdown-content code {
    background-color: rgba(27, 31, 35, 0.05);
    border-radius: 3px;
    font-size: 85%;
    margin: 0;
    padding: 0.2em 0.4em;
}

.markdown-content pre {
    background-color: #f6f8fa;
    border-radius: 6px;
    font-size: 85%;
    line-height: 1.45;
    overflow: auto;
    padding: 16px;
    margin-bottom: 16px;
}

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

.markdown-content blockquote {
    border-left: 4px solid #dfe2e5;
    color: #6a737d;
    padding: 0 1em;
    margin-bottom: 16px;
}

.markdown-content table {
    border-collapse: collapse;
    margin-bottom: 16px;
    width: 100%;
}

.markdown-content table th,
.markdown-content table td {
    border: 1px solid #dfe2e5;
    padding: 6px 13px;
}

.markdown-content table th {
    background-color: #f6f8fa;
    font-weight: 600;
}

.markdown-content a {
    color: #667eea;
    text-decoration: none;
}

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

/* PDF viewer */
.pdf-viewer {
    width: 100%;
    height: 70vh;
    min-height: 500px;
    border: none;
    border-radius: 8px;
}

.modal-footer {
    padding: 20px 30px;
    border-top: 1px solid #e9ecef;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    background-color: #f8f9fa;
    border-radius: 0 0 12px 12px;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .container {
        margin: 10px;
        border-radius: 8px;
    }

    header, .breadcrumb, .search-box, .file-list {
        padding: 15px 20px;
    }

    .file-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .file-icon {
        margin-bottom: 12px;
    }

    .file-actions {
        width: 100%;
        margin-top: 12px;
    }

    .btn {
        flex: 1;
    }

    .modal-content {
        width: 95%;
        margin: 5% auto;
        max-height: 95vh;
    }

    .modal-header {
        padding: 15px 20px;
    }

    .modal-header h2 {
        font-size: 1.2em;
    }

    .modal-body {
        padding: 20px;
    }

    .pdf-viewer {
        height: 60vh;
        min-height: 400px;
    }
}