:root {
    --color-primary: #0052cc;
    --color-primary-hover: #0747a6;
    --color-secondary: #42526e;
    --color-background: #fafbfc;
    --color-surface: #ffffff;
    --color-border: #dfe1e6;
    --color-text: #172b4d;
    --color-text-light: #6b778c;
    --color-success: #00875a;
    --color-danger: #de350b;
    --shadow-1: 0 1px 1px rgba(9,30,66,0.08);
    --shadow-2: 0 3px 5px rgba(9,30,66,0.08);
    --shadow-3: 0 8px 12px rgba(9,30,66,0.15);
    --radius: 4px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: var(--color-background);
    color: var(--color-text);
    line-height: 1.5;
    overflow: hidden;
}

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

/* Header */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-primary);
}

.logo h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
}

.logo svg {
    width: 28px;
    height: 28px;
}

/* Toolbar */
.toolbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    gap: 4px;
    padding: 0 8px;
    border-right: 1px solid var(--color-border);
}

.toolbar-group:last-child {
    border-right: none;
    margin-left: auto;
}

.btn-icon {
    background: transparent;
    border: none;
    padding: 8px;
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--color-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.btn-icon:active {
    transform: scale(0.95);
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 8px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

#language-select {
    padding: 6px 12px;
    font-size: 14px;
}

/* Toggle */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.toggle-container input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.toggle-label {
    font-size: 14px;
    color: var(--color-text);
}

/* Editor */
.editor-container {
    flex: 1;
    overflow: hidden;
    background: var(--color-surface);
}

.editor-wrapper {
    height: 100%;
    display: flex;
}

.editor {
    width: 100%;
    height: 100%;
    padding: 24px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    border: none;
    outline: none;
    resize: none;
    background: var(--color-surface);
    color: var(--color-text);
    transition: var(--transition);
}

.editor::placeholder {
    color: var(--color-text-light);
}

.preview {
    width: 50%;
    height: 100%;
    padding: 24px;
    overflow-y: auto;
    background: var(--color-background);
    border-left: 1px solid var(--color-border);
    display: none;
}

/* Preview styles */
.preview h1, .preview h2, .preview h3, .preview h4, .preview h5, .preview h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--color-text);
}

.preview h1 { font-size: 32px; border-bottom: 1px solid var(--color-border); padding-bottom: 8px; }
.preview h2 { font-size: 24px; }
.preview h3 { font-size: 20px; }
.preview h4 { font-size: 16px; }

.preview p {
    margin-bottom: 16px;
    line-height: 1.6;
}

.preview ul, .preview ol {
    margin-bottom: 16px;
    padding-left: 32px;
}

.preview li {
    margin-bottom: 4px;
    line-height: 1.6;
}

.preview pre {
    background: #2d3748;
    color: #e2e8f0;
    padding: 16px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin-bottom: 16px;
    font-size: 13px;
    line-height: 1.5;
}

.preview code {
    background: var(--color-background);
    color: var(--color-danger);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 13px;
}

.preview pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.preview blockquote {
    border-left: 4px solid var(--color-primary);
    margin: 16px 0;
    padding-left: 16px;
    color: var(--color-text-light);
}

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

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

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

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

.preview th {
    background: var(--color-background);
    font-weight: 600;
}

.preview img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
}

.preview hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 24px 0;
}

/* Status Bar */
.status-bar {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 8px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--color-text-light);
}

.status-info {
    display: flex;
    gap: 16px;
}

#save-status {
    font-weight: 500;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(9, 30, 66, 0.54);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

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

.modal-content {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 32px;
    width: 90%;
    max-width: 400px;
    box-shadow: var(--shadow-3);
    animation: slideUp 0.3s ease;
}

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

.modal-content h2 {
    margin-bottom: 12px;
    color: var(--color-text);
    font-size: 20px;
    font-weight: 600;
}

.modal-content p {
    margin-bottom: 24px;
    color: var(--color-text-light);
    font-size: 14px;
}

.password-input {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 14px;
    outline: none;
    transition: var(--transition);
    margin-bottom: 24px;
}

.password-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.1);
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

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

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

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

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

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        padding: 12px 16px;
    }
    
    .toolbar {
        padding: 8px 16px;
    }
    
    .toolbar-group {
        padding: 0 4px;
    }
    
    .editor {
        padding: 16px;
    }
    
    .preview {
        padding: 16px;
    }
    
    .status-bar {
        padding: 8px 16px;
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }
    
    .modal-content {
        margin: 16px;
        width: calc(100% - 32px);
    }
}

/* Print styles */
@media print {
    .header,
    .toolbar,
    .status-bar {
        display: none;
    }
    
    .editor-container {
        height: auto;
    }
    
    .editor {
        width: 100% !important;
        height: auto;
        padding: 0;
    }
    
    .preview {
        display: none !important;
    }
}