/* CSS Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* App Colors */
    --app-bg: #f5f5f5;
    --panel-bg: #ffffff;
    --header-bg: #1a1a2e;
    --header-text: #ffffff;
    --border-color: #e0e0e0;
    --text-primary: #333333;
    --text-secondary: #666666;
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
}

html, body {
    height: 100%;
    font-family: var(--font-family);
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--app-bg);
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--header-bg);
    color: var(--header-text);
    box-shadow: var(--shadow-md);
    z-index: 100;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.header-right {
    display: flex;
    gap: var(--spacing-sm);
}

/* Main Content - Split Pane */
.main-content {
    display: flex;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

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

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

.panel-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Editor Panel */
.editor-panel {
    flex: 1;
    min-width: 300px;
    max-width: 50%;
    border-right: none;
}

.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    position: relative;
}

#mermaid-input {
    flex: 1;
    width: 100%;
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    border: none;
    resize: none;
    outline: none;
    background: var(--panel-bg);
}

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

.error-display {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--error-color);
    color: white;
    font-family: var(--font-mono);
    font-size: 12px;
    max-height: 100px;
    overflow-y: auto;
}

.error-display.hidden {
    display: none;
}

/* Preview Panel */
.preview-panel {
    flex: 1;
    min-width: 300px;
}

.preview-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    overflow: auto;
    background: #fafafa;
    background-image:
        linear-gradient(45deg, #eee 25%, transparent 25%),
        linear-gradient(-45deg, #eee 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #eee 75%),
        linear-gradient(-45deg, transparent 75%, #eee 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.mermaid-output {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    max-width: 100%;
    max-height: 100%;
    overflow: auto;
}

.mermaid-output svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Aspect Controls */
.aspect-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.custom-ratio {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.custom-ratio.hidden {
    display: none;
}

.ratio-input {
    width: 50px;
    padding: var(--spacing-xs);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    text-align: center;
}

/* Color Panel */
.color-panel {
    background: var(--panel-bg);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
}

.color-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.color-panel-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.theme-presets {
    display: flex;
    gap: var(--spacing-xs);
}

.color-categories {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.color-category h3 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
}

.color-grid {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.color-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.color-item label {
    font-size: 11px;
    color: var(--text-secondary);
}

.color-item input[type="color"] {
    width: 60px;
    height: 32px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: none;
}

.color-item input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 2px;
}

.color-item input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 2px;
}

/* Export Panel */
.export-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--panel-bg);
    border-top: 1px solid var(--border-color);
}

.export-options {
    display: flex;
    gap: var(--spacing-xl);
}

.export-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.export-group label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.scale-buttons {
    display: flex;
    gap: 2px;
}

.export-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* Template Selector */
.template-selector select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--panel-bg);
    font-size: 0.875rem;
    cursor: pointer;
}

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

    .editor-panel,
    .preview-panel {
        max-width: 100%;
        min-height: 40vh;
    }

    .color-categories {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .export-panel {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .export-options {
        flex-direction: column;
        width: 100%;
    }
}