:root {
    /* Colors */
    --color-primary: #667eea;
    --color-primary-light: #7c8ff0;
    --color-secondary: #6c757d;
    --color-success: #28a745;
    --color-success-light: #20c997;
    --color-accent: #56ab2f;
    --color-accent-light: #a8e063;
    
    /* Backgrounds */
    --bg-light: linear-gradient(135deg, #e0e0e0 0%, #f5f5f5 100%);
    --bg-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --bg-container-light: #fff;
    --bg-container-dark: #1e1e2e;
    --bg-header-light: rgba(255, 255, 255, 0.98);
    --bg-header-dark: rgba(26, 26, 46, 0.98);
    
    /* Text Colors */
    --text-primary-light: #333;
    --text-primary-dark: #e0e0e0;
    --text-secondary-light: #6c757d;
    --text-secondary-dark: #a0a0a0;
    
    /* Borders */
    --border-light: #ccc;
    --border-dark: #444;
    
    /* Transitions */
    --transition-base: 0.3s ease;
    --transition-fast: 0.15s ease;
    --transition-slow: 0.5s ease;
    
    /* Spacing */
    --gap-sm: 8px;
    --gap-md: 12px;
    --gap-lg: 20px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    margin: 0;
    background: var(--bg-light);
    background-attachment: fixed;
    color: var(--text-primary-light);
    padding-bottom: 20px;
    transition: background var(--transition-base), color var(--transition-base);
}

body.dark-mode {
    background: var(--bg-dark);
    color: var(--text-primary-dark);
}

/* App Header */
.app-header {
    background: var(--bg-header-light);
    backdrop-filter: blur(10px);
    padding: 20px;
    border-bottom: 3px solid transparent;
    border-image: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    border-image-slice: 1;
    transition: background var(--transition-base);
}

body.dark-mode .app-header {
    background: var(--bg-header-dark);
    border-image: linear-gradient(90deg, var(--color-primary) 0%, #764ba2 100%);
}

.header-content {
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--gap-lg);
    flex-wrap: wrap;
    padding: 0 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    animation: fadeInDown 0.6s ease-out;
}

.logo svg {
    filter: drop-shadow(0 2px 8px rgba(86, 171, 47, 0.3));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
}

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

.title-group h1 {
    margin: 0;
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.subtitle {
    margin: 2px 0 0 0;
    font-size: 14px;
    color: var(--text-secondary-light);
    font-weight: 400;
}

body.dark-mode .subtitle {
    color: var(--text-secondary-dark);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--gap-md);
}

/* Uniform header action button heights */
.header-actions > .theme-toggle-btn,
.header-actions > .sponsor-link,
.header-actions > .help-link,
.header-actions > .github-link {
    height: 48px;
    box-sizing: border-box;
}

/* Toggle Buttons (Theme & Pattern) */
.theme-toggle-btn,
.pattern-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--gap-sm);
    padding: 12px 16px; /* Increased vertical padding for uniform height */
    background: rgba(108, 117, 125, 0.1);
    border: 2px solid var(--color-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--color-secondary);
    font-size: 18px;
}

.theme-toggle-btn:hover,
.pattern-toggle-btn:hover {
    background: rgba(108, 117, 125, 0.2);
    transform: translateY(-2px);
}

.pattern-toggle-btn:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Icon States */
.theme-toggle-btn .sun-icon,
.pattern-toggle-btn .dot-icon {
    opacity: 0.8;
}

.theme-toggle-btn .moon-icon,
.pattern-toggle-btn .grid-icon {
    opacity: 0.3;
}

.theme-toggle-btn .sun-icon,
.theme-toggle-btn .moon-icon {
    transition: opacity var(--transition-base);
}

.pattern-toggle-btn .dot-icon,
.pattern-toggle-btn .grid-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    transition: opacity var(--transition-base);
}

.pattern-toggle-btn .blank-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    opacity: 0.2;
    transition: opacity var(--transition-base);
}

.pattern-toggle-btn svg {
    display: block;
}

.pattern-toggle-btn[data-pattern="grid"] .dot-icon {
    opacity: 0.3;
}

.pattern-toggle-btn[data-pattern="grid"] .grid-icon {
    opacity: 0.8;
}

.pattern-toggle-btn[data-pattern="none"] .dot-icon,
.pattern-toggle-btn[data-pattern="none"] .grid-icon {
    opacity: 0.15;
}

.pattern-toggle-btn[data-pattern="none"] .blank-icon {
    opacity: 0.85;
}

/* Dark Mode Toggle States */
body.dark-mode .theme-toggle-btn,
body.dark-mode .pattern-toggle-btn {
    background: rgba(102, 126, 234, 0.1);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

body.dark-mode .theme-toggle-btn:hover,
body.dark-mode .pattern-toggle-btn:hover {
    background: rgba(102, 126, 234, 0.2);
}

body.dark-mode .theme-toggle-btn .sun-icon {
    opacity: 0.3;
}

body.dark-mode .theme-toggle-btn .moon-icon {
    opacity: 0.9;
}

/* Sponsor Link */
.sponsor-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 20px; /* Adjusted for uniform height */
    background: linear-gradient(135deg, #FFDD00 0%, #FBB034 100%);
    color: #000;
    text-decoration: none;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 2px 8px rgba(251, 176, 52, 0.3);
}

.sponsor-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(251, 176, 52, 0.4);
}

.sponsor-link svg {
    flex-shrink: 0;
}

/* Sponsor Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease;
}

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

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-container-light);
    padding: 40px;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

body.dark-mode .modal-content {
    background: var(--bg-container-dark);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 32px;
    color: #999;
    cursor: pointer;
    transition: color var(--transition-base);
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
}

.modal-close:hover {
    color: #333;
}

body.dark-mode .modal-close:hover {
    color: #fff;
}

.modal-content h2 {
    margin: 0 0 10px 0;
    font-size: 28px;
    color: var(--text-primary-light);
}

body.dark-mode .modal-content h2 {
    color: var(--text-primary-dark);
}

.modal-content > p {
    margin: 0 0 30px 0;
    color: var(--text-secondary-light);
    font-size: 16px;
}

body.dark-mode .modal-content > p {
    color: var(--text-secondary-dark);
}

.sponsor-options {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.sponsor-option {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    border-radius: 12px;
    text-decoration: none;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.sponsor-option:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.sponsor-option.buymeacoffee {
    background: linear-gradient(135deg, #FFDD00 0%, #FBB034 100%);
    color: #000;
}

.sponsor-option.buymeacoffee:hover {
    border-color: #FF8800;
}

.sponsor-option.kofi {
    background: linear-gradient(135deg, #29ABE0 0%, #00B9FE 100%);
    color: #fff;
}

.sponsor-option.kofi:hover {
    border-color: #0077CC;
}

.sponsor-option svg {
    flex-shrink: 0;
}

.sponsor-info h3 {
    margin: 0 0 5px 0;
    font-size: 18px;
    font-weight: 600;
}

.sponsor-info p {
    margin: 0;
    font-size: 14px;
    opacity: 0.9;
}

@media (max-width: 600px) {
    .modal-content {
        padding: 30px 20px;
    }
    
    .sponsor-option {
        padding: 15px;
    }
    
    .sponsor-option svg {
        width: 20px;
        height: 20px;
    }
}

/* Help Link */
.help-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 20px; /* Adjusted for uniform height */
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    font-size: 14px;
    transition: all var(--transition-base);
    box-shadow: 0 2px 8px rgba(86, 171, 47, 0.3);
}

.help-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(86, 171, 47, 0.4);
}

.help-link svg {
    flex-shrink: 0;
}

/* GitHub Repository Link */
.github-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px; /* Adjusted for uniform height */
    background: linear-gradient(135deg, #24292e 0%, #2f363d 100%);
    color: #f0f3f6;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    position: relative;
    border: 1px solid #1a1f23;
    box-shadow: 0 2px 8px rgba(36,41,46,0.4), inset 0 0 0 1px rgba(255,255,255,0.05);
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
}
.github-link svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.4));
}
.github-link:hover {
    background: linear-gradient(135deg, #2f363d 0%, #3b4349 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(36,41,46,0.5);
}
.github-link:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(36,41,46,0.5);
}
.github-link:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.5), 0 4px 14px rgba(36,41,46,0.6);
}
body.dark-mode .github-link {
    background: linear-gradient(135deg, #2d3339 0%, #1b1f23 100%);
    color: #f0f3f6;
    border-color: #161b22;
    box-shadow: 0 2px 8px rgba(0,0,0,0.6), inset 0 0 0 1px rgba(255,255,255,0.04);
}
body.dark-mode .github-link:hover {
    background: linear-gradient(135deg, #343b41 0%, #20262b 100%);
}
body.dark-mode .github-link:focus-visible {
    box-shadow: 0 0 0 3px rgba(118,75,162,0.55), 0 4px 14px rgba(0,0,0,0.7);
}

@media (max-width: 600px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .title-group h1 {
        font-size: 24px;
    }
}

.split-container {
    display: flex;
    height: calc(100vh - 150px); /* Viewport height minus header height, etc. */
}

.split {
    /* padding: 10px; */ /* Removed as padding is managed in inner container */
    box-sizing: border-box;
    /* overflow-y: auto; */ /* Remove scrollbar */
}

.gutter {
    background: #9e9e9e;
    background-repeat: no-repeat;
    background-position: 50%;
    transition: background var(--transition-base);
}

.gutter:hover {
    background: #b0b0b0;
}

body.dark-mode .gutter {
    background: var(--border-dark);
}

body.dark-mode .gutter:hover {
    background: #555;
}

.gutter.gutter-horizontal {
    cursor: col-resize;
}

.editor-container, 
.diagram-container {
    width: 100%;
    height: 100%;
    padding: 20px;
    background-color: var(--bg-container-light);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-base);
}

body.dark-mode .editor-container,
body.dark-mode .diagram-container {
    background-color: var(--bg-container-dark);
}

.editor-container {
    overflow: hidden;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.editor-header label {
    margin: 0;
    font-weight: bold;
}

body.dark-mode .editor-header label {
    color: #e0e0e0;
}

.header-controls {
    display: flex;
    gap: 10px;
}

#theme-selector,
#sample-selector {
    padding: 6px 10px;
    border-radius: 4px;
    border: 1px solid var(--border-light);
    font-size: 14px;
    background-color: white;
    cursor: pointer;
    transition: all var(--transition-base);
}

#theme-selector:hover,
#sample-selector:hover {
    border-color: #007bff;
}

body.dark-mode #theme-selector,
body.dark-mode #sample-selector {
    background-color: #2a2a3e;
    border-color: var(--border-dark);
    color: var(--text-primary-dark);
}

body.dark-mode #theme-selector:hover,
body.dark-mode #sample-selector:hover {
    border-color: var(--color-primary);
}

.diagram-container {
    overflow: hidden; /* svg-pan-zoom handles navigation */
}

.diagram-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

/* Zoom Controls */
.zoom-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.zoom-level {
    min-width: 50px;
    text-align: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary-light);
    padding: 4px 8px;
    background: #f8f9fa;
    border-radius: 4px;
    user-select: none;
    transition: all var(--transition-base);
}

body.dark-mode .zoom-level {
    background: #2a2a3e;
    color: var(--text-primary-dark);
}

#mermaid-diagram {
    text-align: center;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-position: 0 0;
    transition: background-image var(--transition-base);
}

.editor-wrapper {
    display: flex;
    flex-grow: 1;
    flex: 1;
    border: 1px solid var(--border-light);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
    height: 100%;
    transition: border-color var(--transition-base);
}

body.dark-mode .editor-wrapper {
    border-color: var(--border-dark);
}

/* CodeMirror custom styles */
.CodeMirror {
    height: 100%;
    width: 100%;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 14px;
}

.CodeMirror-gutters {
    background-color: #263238;
    border-right: 1px solid #37474f;
}

/* Active line styling - Dark themes */
.cm-s-material-darker div.CodeMirror-activeline-background,
.cm-s-monokai div.CodeMirror-activeline-background,
.cm-s-dracula div.CodeMirror-activeline-background,
.cm-s-nord div.CodeMirror-activeline-background,
.cm-s-ambiance div.CodeMirror-activeline-background,
.cm-s-solarized.cm-s-dark div.CodeMirror-activeline-background {
    background: rgba(255, 255, 255, 0.1) !important;
}

.cm-s-material-darker .CodeMirror-activeline .CodeMirror-gutter-elt,
.cm-s-monokai .CodeMirror-activeline .CodeMirror-gutter-elt,
.cm-s-dracula .CodeMirror-activeline .CodeMirror-gutter-elt,
.cm-s-nord .CodeMirror-activeline .CodeMirror-gutter-elt,
.cm-s-ambiance .CodeMirror-activeline .CodeMirror-gutter-elt,
.cm-s-solarized.cm-s-dark .CodeMirror-activeline .CodeMirror-gutter-elt {
    background-color: rgba(255, 255, 255, 0.12) !important;
}

/* Active line styling - Light themes */
.cm-s-eclipse div.CodeMirror-activeline-background,
.cm-s-idea div.CodeMirror-activeline-background,
.cm-s-solarized.cm-s-light div.CodeMirror-activeline-background {
    background: rgba(0, 0, 0, 0.08) !important;
}

.cm-s-eclipse .CodeMirror-activeline .CodeMirror-gutter-elt,
.cm-s-idea .CodeMirror-activeline .CodeMirror-gutter-elt,
.cm-s-solarized.cm-s-light .CodeMirror-activeline .CodeMirror-gutter-elt {
    background-color: rgba(0, 0, 0, 0.1) !important;
}


textarea {
    width: 100%;
    box-sizing: border-box;
    border: none; /* Border handled by wrapper */
    border-radius: 0;
    padding: 10px;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 14px;
    line-height: 1.5;
    flex-grow: 1;
    resize: none;
    outline: none;
    white-space: pre; /* Prevent wrapping for line number sync */
    overflow: auto;
    background-attachment: local;
}

/* Toolbar Styles */
.toolbar {
    display: flex;
    gap: var(--gap-md);
    margin-top: var(--gap-md);
    flex-wrap: wrap;
    flex-shrink: 0;
    align-items: center;
}

.toolbar-group {
    display: flex;
    gap: var(--gap-sm);
    padding: 4px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
    transition: all var(--transition-base);
}

body.dark-mode .toolbar-group {
    background: #2a2a3e;
    border-color: var(--border-dark);
}

/* Export dropdown */
.export-dropdown {
    position: relative;
    display: inline-block;
}

.export-dropdown #export-btn .chevron {
    margin-left: 6px;
    transition: transform 0.2s ease;
}

.export-dropdown.open #export-btn .chevron {
    transform: rotate(180deg);
}

.export-menu {
    position: absolute;
    bottom: 100%;
    left: 0;
    margin-bottom: 6px;
    background: var(--bg-container-light);
    border: 1px solid #dcdfe3;
    border-radius: 8px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
    padding: 6px;
    display: none;
    min-width: 140px;
    z-index: 50;
    animation: fadeInMenuUp var(--transition-fast);
    transition: all var(--transition-base);
}

body.dark-mode .export-menu {
    background: #2a2a3e;
    border-color: var(--border-dark);
    box-shadow: 0 6px 18px rgba(0,0,0,0.3);
}

@keyframes fadeInMenuUp {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.export-dropdown.open .export-menu {
    display: block;
}

.export-item {
    width: 100%;
    background: #f4f6f8;
    border: none;
    padding: 8px 10px;
    margin: 2px 0;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.export-item:hover {
    background: var(--color-primary);
    color: #fff;
}

.export-item:active {
    background: #546ed9;
}

body.dark-mode .export-item {
    background: var(--bg-container-dark);
    color: var(--text-primary-dark);
}

body.dark-mode .export-item:hover {
    background: var(--color-primary);
    color: #fff;
}

.export-item[data-format="png"]::before { content: "📄"; }
.export-item[data-format="jpg"]::before { content: "🖼️"; }
.export-item[data-format="svg"]::before { content: "🔧"; }
.export-item[data-format="pdf"]::before { content: "📑"; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.btn svg {
    flex-shrink: 0;
}

.btn span {
    line-height: 1;
}

/* Button Variants */
.btn-success {
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-light) 100%);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(135deg, #218838 0%, #1aa179 100%);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #5a6268 100%);
    color: white;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #5a6268 0%, #4e555b 100%);
}

.btn-info {
    background: linear-gradient(135deg, #17a2b8 0%, #138496 100%);
    color: white;
}

.btn-info:hover {
    background: linear-gradient(135deg, #138496 0%, #0f6674 100%);
}

.btn-warning {
    background: linear-gradient(135deg, #ffc107 0%, #ffb300 100%);
    color: #212529;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #e0a800 0%, #d39e00 100%);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, #8a5bb5 100%);
}

/* Responsive Design */
@media (max-width: 768px) {
    .toolbar {
        flex-direction: column;
        gap: 8px;
    }
    
    .toolbar-group {
        width: 100%;
        justify-content: center;
    }
    
    .btn {
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .btn span {
        display: none;
    }
    
    .btn {
        padding: 10px;
    }
}

#mermaid-diagram {
    text-align: center;
}

#toast-notification {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 14px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

#toast-notification.show {
    opacity: 1;
    visibility: visible;
}

/* Help Page Styles */
.help-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    text-decoration: none;
    color: #007bff;
    font-weight: bold;
    font-size: 16px;
}

.back-link:hover {
    text-decoration: underline;
}

.help-section {
    margin-bottom: 40px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
}

.help-section:last-child {
    border-bottom: none;
}

/* Mermaid 에러 요소 숨김 */
.error-icon,
.error-text {
    display: none !important;
}

/* CodeMirror 에러 라인 표시 */
.CodeMirror .error-line {
    background-color: rgba(255, 0, 0, 0.1);
    border-bottom: 2px dotted #ff0000;
}

.help-section h2 {
    margin-top: 0;
    color: #333;
}

.example-block {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    overflow: hidden;
}

@media (min-width: 768px) {
    .example-block {
        flex-direction: row;
    }
}

.code-preview {
    flex: 1;
    background-color: #f8f9fa;
    padding: 15px;
    border-right: 1px solid #ddd;
    overflow-x: auto;
}

.code-preview pre {
    margin: 0;
    font-family: monospace;
    white-space: pre-wrap;
}

.example-block .mermaid {
    flex: 1;
    padding: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #fff;
}