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

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --bg-color: #ecf0f1;
    --text-color: #2c3e50;
    --border-color: #bdc3c7;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #fff;
    color: var(--text-color);
    line-height: 1.6;
}

/* Container */
.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: var(--bg-color);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 2em;
    margin-bottom: 5px;
}

.header p {
    font-size: 0.95em;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    gap: 0;
}

/* Panels */
.panel {
    display: flex;
    flex-direction: column;
    background: white;
    border-right: 1px solid var(--border-color);
    overflow: hidden;
}

.left-panel {
    flex: 0 0 40%;
    border-right: 2px solid var(--border-color);
}

.right-panel {
    flex: 1;
    border-right: none;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.panel-header h2 {
    font-size: 1.2em;
    color: var(--text-color);
}

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

/* Upload Section */
.upload-section {
    padding: 20px;
    flex-shrink: 0;
}

.upload-area {
    border: 3px dashed var(--primary-color);
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: #f0f7ff;
}

.upload-area:hover {
    border-color: var(--primary-dark);
    background-color: #e3f2fd;
}

.upload-area.dragover {
    border-color: var(--success-color);
    background-color: #e8f5e9;
}

.upload-icon {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.upload-area p {
    margin: 5px 0;
    color: var(--text-color);
}

.upload-hint {
    font-size: 0.85em;
    color: #7f8c8d;
}

.format-hint {
    margin-top: 10px;
    font-size: 0.8em;
    color: #95a5a6;
    text-align: center;
}

/* Document Info */
.document-info {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow-y: auto;
    padding: 0;
}

.doc-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9em;
    color: #7f8c8d;
}

.doc-id {
    word-break: break-all;
    font-family: monospace;
    background-color: #ecf0f1;
    padding: 5px 8px;
    border-radius: 4px;
}

.page-count {
    font-weight: bold;
    color: var(--primary-color);
}

/* Page Navigation */
.page-nav {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.nav-btn {
    flex: 1;
    min-width: 80px;
    padding: 8px 12px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s;
}

.nav-btn:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-dark);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-counter {
    display: flex;
    align-items: center;
    gap: 5px;
    flex: 1;
    min-width: 100px;
}

.page-counter input {
    width: 50px;
    padding: 5px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    text-align: center;
    font-size: 0.9em;
}

.page-counter .total {
    color: #7f8c8d;
    font-size: 0.9em;
}

/* Image Preview */
.image-preview-container {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    overflow: hidden;
    background-color: #f5f5f5;
    padding: 10px;
    position: relative;
    min-height: 400px;
}

.page-preview {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: var(--shadow);
}

/* Page Controls */
.page-controls {
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

/* Status Indicator */
.status-indicator {
    padding: 15px 20px;
    background-color: #e8f5e9;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9em;
}

.status-text {
    color: var(--success-color);
    font-weight: bold;
}

.status-text.processing {
    color: var(--warning-color);
}

.status-text.error {
    color: var(--danger-color);
}

/* Editor Container */
.editor-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

.markdown-editor,
.markdown-preview {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    border: none;
    font-family: 'Courier New', monospace;
    font-size: 0.95em;
    line-height: 1.6;
    resize: none;
}

.markdown-editor {
    background-color: #2c3e50;
    color: #ecf0f1;
    display: block;
}

.markdown-preview {
    background-color: white;
    color: var(--text-color);
    display: none;
    border-left: 2px solid var(--border-color);
    overflow-x: hidden;
    word-wrap: break-word;
    word-break: break-word;
}

.markdown-preview.visible {
    display: block;
}

/* Markdown Preview Styles */
.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3,
.markdown-preview h4,
.markdown-preview h5,
.markdown-preview h6 {
    margin-top: 20px;
    margin-bottom: 10px;
    font-weight: bold;
}

.markdown-preview h1 {
    font-size: 1.8em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.markdown-preview h2 {
    font-size: 1.5em;
}

.markdown-preview h3 {
    font-size: 1.3em;
}

.markdown-preview code {
    background-color: #f0f0f0;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
}

.markdown-preview pre {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 15px;
    border-radius: 4px;
    overflow-x: auto;
    margin: 10px 0;
}

.markdown-preview pre code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    color: inherit;
}

.markdown-preview blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 15px;
    margin-left: 0;
    color: #7f8c8d;
}

.markdown-preview table {
    border-collapse: collapse;
    width: 100%;
    margin: 10px 0;
}

.markdown-preview table th,
.markdown-preview table td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

.markdown-preview table th {
    background-color: #f8f9fa;
    font-weight: bold;
}

.markdown-preview ul,
.markdown-preview ol {
    margin-left: 20px;
    margin-bottom: 10px;
}

.markdown-preview li {
    margin-bottom: 5px;
}

.markdown-preview img {
    max-width: 100%;
    height: auto;
    margin: 10px 0;
    border-radius: 4px;
}

/* Editor Footer */
.editor-footer {
    padding: 12px 20px;
    background-color: #f8f9fa;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.toggle-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.9em;
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: 10px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    box-shadow: var(--shadow);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.85em;
    background-color: white;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-small:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-dark);
}

.btn-small:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Loader */
.loader {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(52, 152, 219, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    pointer-events: none;
}

.toast {
    background-color: white;
    border-left: 4px solid var(--success-color);
    border-radius: 4px;
    padding: 15px 20px;
    margin-bottom: 10px;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s ease;
    pointer-events: auto;
    max-width: 400px;
    word-wrap: break-word;
}

.toast.success {
    border-left-color: var(--success-color);
    color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
    color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
    color: var(--warning-color);
}

.toast.info {
    border-left-color: var(--primary-color);
    color: var(--primary-color);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 1024px) {
    .left-panel {
        flex: 0 0 50%;
    }

    .btn-small {
        padding: 5px 10px;
        font-size: 0.8em;
    }
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }

    .left-panel,
    .right-panel {
        flex: 1;
        border-right: none;
        border-bottom: 2px solid var(--border-color);
    }

    .right-panel {
        border-bottom: none;
    }

    .panel-header {
        flex-wrap: wrap;
    }

    .header-actions {
        width: 100%;
        margin-top: 10px;
    }

    .page-nav {
        flex-direction: column;
    }

    .nav-btn {
        width: 100%;
    }

    .page-counter {
        width: 100%;
    }

    .markdown-preview {
        display: none !important;
    }
}

/* 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;
}