:root {
    /* Primary Colors - Teal/Green Theme */
    --multiline-primary: #059669;
    --multiline-primary-dark: #047857;
    --multiline-primary-light: #d1fae5;
    --multiline-primary-hover: #047857;
    --multiline-primary-shadow: rgb(5 150 105 / 25%);
    
    /* Semantic Colors */
    --multiline-success: #10b981;
    --multiline-warning: #f59e0b;
    --multiline-danger: #ef4444;
    --multiline-info: #06b6d4;
    --multiline-accent: #34d399;
    
    /* Surface Colors */
    --multiline-surface: #ffffff;
    --multiline-surface-muted: #f0fdf4;
    --multiline-surface-elevated: #ffffff;
    --multiline-background: #f9fafb;
    --multiline-secondary-bg: #ecfdf5;
    
    /* Border Colors */
    --multiline-border: #d1fae5;
    --multiline-border-light: #ecfdf5;
    --multiline-border-dark: #a7f3d0;
    
    /* Text Colors */
    --multiline-text-main: #0f172a;
    --multiline-text-muted: #64748b;
    --multiline-text-light: #94a3b8;
    --multiline-text-inverse: #ffffff;
    
    /* Shadow System */
    --multiline-shadow-soft: 0 20px 45px rgba(15, 23, 42, 0.08);
    --multiline-shadow-sm: 0 1px 2px rgb(15 23 42 / 0.08);
    --multiline-shadow-md: 0 4px 12px rgb(15 23 42 / 0.08);
    --multiline-shadow-lg: 0 12px 24px rgb(15 23 42 / 0.12);
    --multiline-shadow-xl: 0 20px 25px rgb(15 23 42 / 0.1);
    
    /* Border Radius */
    --multiline-radius-sm: 0.5rem;
    --multiline-radius-md: 0.875rem;
    --multiline-radius-lg: 1.25rem;
    --multiline-radius-xl: 1.75rem;
    --multiline-radius-full: 9999px;
    
    /* Spacing */
    --multiline-spacing-xs: 0.25rem;
    --multiline-spacing-sm: 0.5rem;
    --multiline-spacing-md: 1rem;
    --multiline-spacing-lg: 1.5rem;
    --multiline-spacing-xl: 2rem;
    
    /* Legacy Variables */
    --primary-color: var(--multiline-primary);
    --primary-color-light: var(--multiline-primary-light);
    --surface-color: var(--multiline-surface);
    --light-bg: var(--multiline-background);
    --border-color: var(--multiline-border);
    --text-primary: var(--multiline-text-main);
    --text-secondary: var(--multiline-text-muted);
    --secondary-color: var(--multiline-text-muted);
    --success-color: var(--multiline-success);
    --info-color: var(--multiline-info);
    --warning-color: var(--multiline-warning);
    --danger-color: var(--multiline-danger);
    --dark-text: var(--multiline-text-main);
    --border-radius: var(--multiline-radius-lg);
    --shadow: var(--multiline-shadow-md);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Component Variables */
    --primary: #059669;
    --primary-dark: #047857;
    --border: #d1fae5;
    --surface: #ffffff;
    --shadow-soft: 0 20px 45px rgba(15, 23, 42, 0.08);
    --surface-muted: #f0fdf4;
    --text-main: #0f172a;
    --text-muted: #64748b;
}

.multiline-converter-wrapper {
    padding-bottom: 3rem;
}

.multiline-header-section {
    margin-bottom: 2rem;
}

.multiline-main-title {
    font-size: clamp(1.875rem, 4.5vw, 2.75rem);
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--multiline-text-main);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.multiline-subtitle {
    font-size: clamp(1rem, 2vw, 1.1875rem);
    margin-bottom: 1.5rem;
    color: var(--multiline-text-muted);
    max-width: 760px;
    line-height: 1.6;
}

.multiline-meta-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.875rem;
    justify-content: flex-start;
    list-style: none;
    padding: 0;
    margin: 0;
}

.meta-badge {
    padding: 0.625rem 1.25rem;
    border-radius: var(--multiline-radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    border: 1.5px solid var(--multiline-border);
    color: var(--multiline-text-main);
    transition: var(--transition);
    background: var(--multiline-primary-light);
    border-color: var(--multiline-primary);
}

.multiline-converter-main {
    background: var(--multiline-surface);
    border-radius: var(--multiline-radius-xl);
    box-shadow: var(--multiline-shadow-lg);
    overflow: hidden;
    margin-bottom: 3rem;
    padding: 2rem;
    position: relative;
}

@media (max-width: 991.98px) {
    .multiline-converter-main {
        padding: 1.5rem;
    }
}

.multiline-input-card,
.multiline-output-card {
    background: var(--multiline-surface);
    border-radius: var(--multiline-radius-lg);
    padding: 1.5rem 1rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    position: relative;
}

.multiline-output-card{
    padding: 1.75rem;
    border: 2px solid var(--multiline-border);
}

.card-header-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
}

.card-section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--multiline-text-main);
    margin: 0;
}

.status-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--multiline-background);
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    color: var(--multiline-text-main);
    line-height: 1.5;
}

.status-bar svg {
    flex-shrink: 0;
    color: var(--multiline-info);
}

.tooltip-wrapper {
    position: relative;
    display: inline-block;
    overflow: visible;
    z-index: 1000;
}

.info-tooltip-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--multiline-info);
    color: white;
    border: none;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: help;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    padding: 0;
    flex-shrink: 0;
}

.info-tooltip-btn:hover {
    background: var(--multiline-primary);
    transform: scale(1.1);
}

.info-tooltip-btn:focus {
    outline: 2px solid var(--multiline-primary);
    outline-offset: 2px;
}

.tooltip-content {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    bottom: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--multiline-text-main);
    color: white;
    text-align: left;
    padding: 0.75rem 1rem;
    border-radius: var(--multiline-radius-md);
    font-size: 0.8125rem;
    z-index: 10000;
    transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
    pointer-events: none;
    max-width: 280px;
    min-width: 200px;
    white-space: normal;
    box-shadow: var(--multiline-shadow-lg);
    word-wrap: break-word;
    line-height: 1.5;
}

.tooltip-content::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--multiline-text-main);
}

.tooltip-wrapper:hover .tooltip-content,
.info-tooltip-btn:focus + .tooltip-content {
    visibility: visible;
    opacity: 1;
    transform: translateX(-50%) translateY(-4px);
}

.editor-container {
    flex: 1;
    min-height: 450px;
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-md);
    overflow: hidden;
    background: var(--multiline-surface);
}

.editor-container .editor {
    width: 100%;
    height: 100%;
    min-height: 450px;
}

.input-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.action-btn-primary,
.action-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--multiline-radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.action-btn-primary {
    background: var(--multiline-primary);
    color: var(--multiline-text-inverse);
    box-shadow: 0 2px 4px var(--multiline-primary-shadow);
}

.action-btn-primary:hover {
    background: var(--multiline-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--multiline-primary-shadow);
}

.action-btn-primary:active {
    transform: translateY(0);
}

.action-btn-primary:focus {
    outline: 2px solid var(--multiline-primary);
    outline-offset: 2px;
}

.action-btn-secondary {
    background: var(--multiline-surface-muted);
    color: var(--multiline-text-main);
    border: 1.5px solid var(--multiline-border);
}

.action-btn-secondary:hover {
    background: var(--multiline-primary-light);
    border-color: var(--multiline-primary);
    color: var(--multiline-primary-dark);
}

.action-btn-secondary:focus {
    outline: 2px solid var(--multiline-primary);
    outline-offset: 2px;
}

.output-stats {
    font-size: 0.875rem;
    color: var(--multiline-text-muted);
    font-weight: 500;
}

.output-actions-panel {
    margin-top: auto;
    padding-top: 1.5rem;
}

.action-buttons-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.action-button {
    flex: 1 1 auto;
    min-width: 120px;
    background: var(--multiline-secondary-bg);
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #405063;
    border: 1px solid #dde3e7;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    gap: 0.5rem;
    text-decoration: none;
}

.action-button:hover {
    transform: translateY(-1px);
    background: var(--multiline-primary-light);
    border-color: var(--multiline-primary);
    color: var(--multiline-primary-dark);
}

.action-button.copied {
    background: #10b981;
    border-color: #10b981;
    color: #ffffff;
}

.action-button svg {
    width: 16px;
    height: 16px;
}

/* Share Container */
.share-container {
    background: var(--multiline-secondary-bg);
    border-radius: var(--multiline-radius-md);
    padding: 1rem 1.25rem;
    border: 1px solid var(--multiline-border);
    margin-top: 1rem;
}

.share-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--multiline-text-main);
}

.share-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.5rem;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.65rem 0.75rem;
    border-radius: 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    color: #ffffff;
    transition: all 0.2s ease;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 20px rgba(15, 23, 42, 0.2);
    color: #ffffff;
}

.share-x { background: #111827; }
.share-facebook { background: #1877f2; }
.share-linkedin { background: #0a66c2; }
.share-reddit { background: #ff4500; }
.share-telegram { background: #229ed9; }
.share-whatsapp { background: #25d366; color: #0f172a; }

.empty-state-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    text-align: center;
    min-height: 450px;
    color: var(--multiline-text-muted);
}

.empty-state-icon {
    color: var(--multiline-text-light);
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.empty-state-content p {
    font-size: 1rem;
    max-width: 400px;
    line-height: 1.6;
}

/* Knowledge Section Styles */
.multiline-knowledge-section {
    padding: 2rem 0;
}

.multiline-article-content {
    margin: 0 auto;
    background: var(--multiline-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--multiline-shadow-md);
    padding: 2.5rem;
    max-width: 100%;
}

.article-header-block {
    padding-bottom: 2rem;
}

.article-header-block h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--multiline-text-main);
    line-height: 1.3;
}

.article-lead {
    font-size: 1.1875rem;
    line-height: 1.8;
    color: var(--multiline-text-main);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.article-header-block p {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--multiline-text-muted);
    margin-bottom: 1.25rem;
}

.article-header-block code {
    background: var(--multiline-primary-light);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-size: 0.9375rem;
    color: var(--multiline-primary-dark);
    
}

.instruction-block {
    background: var(--multiline-surface);
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-lg);
    padding: 2rem;
    margin-bottom: 3rem;
}

.instruction-block h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--multiline-text-main);
}

.steps-ordered-list {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.steps-ordered-list li {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--multiline-text-muted);
    margin-bottom: 0.5rem;
}

.instruction-tip {
    background: var(--multiline-primary-light);
    border-left: 4px solid var(--multiline-primary);
    padding: 1.25rem 1.5rem;
    border-radius: var(--multiline-radius-sm);
    font-size: 0.9375rem;
    color: var(--multiline-primary-dark);
    margin-top: 1.5rem;
    line-height: 1.6;
}

.instruction-tip strong {
    font-weight: 600;
    color: var(--multiline-primary-dark);
}

.scenario-examples-grid {
    margin-bottom: 3rem;
}

.scenario-examples-grid h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--multiline-text-main);
}

.scenario-example-card {
    background: var(--multiline-surface);
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.scenario-example-card:hover {
    box-shadow: var(--multiline-shadow-md);
    border-color: var(--multiline-primary);
}

.scenario-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.scenario-example-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    color: var(--multiline-text-main);
}

.scenario-badge {
    background: var(--multiline-primary-light);
    color: var(--multiline-primary-dark);
    padding: 0.375rem 0.875rem;
    border-radius: var(--multiline-radius-full);
    font-size: 0.8125rem;
    font-weight: 600;
    border: 1px solid var(--multiline-primary);
}

.scenario-details {
    background: var(--multiline-background);
    padding: 1rem 1.25rem;
    border-radius: var(--multiline-radius-sm);
    margin: 1.25rem 0;
    border-left: 3px solid var(--multiline-info);
}

.scenario-details p {
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.scenario-details p:last-child {
    margin-bottom: 0;
}

.scenario-example-card p {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--multiline-text-muted);
    margin-bottom: .5rem;
}

.scenario-outcome {
    background: var(--multiline-surface-muted);
    padding: 1rem 1.25rem;
    border-radius: var(--multiline-radius-sm);
    margin-top: 1.25rem;
    border-left: 3px solid var(--multiline-success);
}

.scenario-outcome strong {
    color: var(--multiline-success);
    font-weight: 600;
}

.scenario-code-block {
    background: var(--multiline-background);
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-md);
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1.25rem 0;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--multiline-text-main);
}

.scenario-code-block code {
    
    white-space: pre;
}

.usecase-roles-panel {
    margin-bottom: 3rem;
}

.usecase-roles-panel h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--multiline-text-main);
}

.usecase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.usecase-item {
    background: var(--multiline-surface);
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-lg);
    padding: 1.5rem;
    transition: var(--transition);
}

.usecase-item:hover {
    border-color: var(--multiline-primary);
    box-shadow: var(--multiline-shadow-sm);
    transform: translateY(-2px);
}

.usecase-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--multiline-text-main);
}

.usecase-item p {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--multiline-text-muted);
    margin: 0;
}

.pros-cons-comparison {
    margin-bottom: 3rem;
}

.pros-cons-comparison h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--multiline-text-main);
}

.comparison-grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.pros-column,
.cons-column {
    background: var(--multiline-surface);
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-lg);
    padding: 2rem;
}

.pros-column h4,
.cons-column h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--multiline-text-main);
}

.pros-column ul,
.cons-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.pros-column li,
.cons-column li {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--multiline-text-muted);
    margin-bottom: 1rem;
    padding-left: 1.75rem;
    position: relative;
}

.pros-column li::before {
    content: "+";
    position: absolute;
    left: 0;
    color: var(--multiline-success);
    font-weight: 600;
    font-size: 1.25rem;
}

.cons-column li::before {
    content: "−";
    position: absolute;
    left: 0;
    color: var(--multiline-warning);
    font-weight: 600;
    font-size: 1.25rem;
}

.topic-guide-section {
    margin-bottom: 3rem;
}

.topic-guide-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--multiline-text-main);
}

.topic-guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.topic-item {
    background: var(--multiline-surface);
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-lg);
    padding: 1.5rem;
    transition: var(--transition);
}

.topic-item:hover {
    border-color: var(--multiline-primary);
    box-shadow: var(--multiline-shadow-sm);
}

.topic-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--multiline-text-main);
}

.topic-item p {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--multiline-text-muted);
    margin: 0;
}

.topic-item a {
    color: var(--multiline-primary);
    text-decoration: none;
    font-weight: 500;
}

.topic-item a:hover {
    text-decoration: underline;
}

.how-tool-works-block {
    background: var(--multiline-surface);
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-lg);
    padding: 2rem;
    margin-bottom: 3rem;
}

.how-tool-works-block h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--multiline-text-main);
}

.how-tool-works-block p {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--multiline-text-muted);
}

.accuracy-limitations-block {
    background: var(--multiline-surface);
    border: 1px solid var(--multiline-border);
    border-radius: var(--multiline-radius-lg);
    padding: 2rem;
    margin-bottom: 3rem;
}

.accuracy-limitations-block h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--multiline-text-main);
}

.accuracy-limitations-block ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.accuracy-limitations-block li {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--multiline-text-muted);
    margin-bottom: 1rem;
    padding-left: 1.75rem;
    position: relative;
}

.accuracy-limitations-block li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--multiline-info);
    font-weight: 600;
}

.team-about-card {
    background: var(--multiline-secondary-bg);
    border: 2px solid var(--multiline-primary-light);
    border-radius: var(--multiline-radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
}

.team-about-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--multiline-primary-dark);
}

.team-about-card p {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--multiline-text-main);
    margin-bottom: 1rem;
}

.team-about-card a {
    color: var(--multiline-primary-dark);
    text-decoration: none;
    font-weight: 500;
}

.team-about-card a:hover {
    text-decoration: underline;
}

.trust-indicator {
    background: var(--multiline-surface);
    padding: 1rem 1.25rem;
    border-radius: var(--multiline-radius-sm);
    border-left: 4px solid var(--multiline-primary);
    margin-top: 1.5rem;
    font-size: 0.9375rem;
    color: var(--multiline-text-muted);
}

/* Mobile Responsive */
@media (max-width: 767.98px) {
    .multiline-converter-main {
        padding: 1rem;
    }

    .multiline-input-card,
    .multiline-output-card {
        padding: 1.25rem;
    }

    .editor-container {
        min-height: 350px;
    }

    .editor-container .editor {
        min-height: 350px;
    }

    .action-buttons-row {
        flex-direction: column;
    }

    .action-button {
        width: 100%;
    }

    .comparison-grid-layout {
        grid-template-columns: 1fr;
    }

    .instruction-block,
    .scenario-example-card,
    .pros-column,
    .cons-column,
    .how-tool-works-block,
    .accuracy-limitations-block {
        padding: 1.5rem;
    }

    .usecase-grid,
    .topic-guide-grid {
        grid-template-columns: 1fr;
    }

    .scenario-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles for keyboard navigation */
button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--multiline-primary);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .multiline-converter-main,
    .input-actions,
    .output-actions-panel {
        display: none;
    }
}