:root {
    --primary-color: #3B82F6;
    --secondary-color: #10B981;
    --accent-color: #8B5CF6;
    --text-color: #111827;
    --text-secondary: #4B5563;
    --text-tertiary: #6B7280;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius-base: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;    
    --radius-2xl: 1.5rem;
    
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    
    --danger-color: #EF4444;
    --danger-light: #FCA5A5;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    

    --brand-primary: var(--primary-color);
    --brand-secondary: var(--secondary-color);
    --text-primary: var(--text-color);
}

[data-theme="dark"] {
    --text-color: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-tertiary: #9CA3AF;
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --bg-tertiary: #374151;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
}

body {
    background: var(--bg-primary);
}

[data-theme="dark"] body {
    background: var(--bg-primary);
}

.tool-hero {
    margin-top: 0;
    padding: 120px 0 80px;
    position: relative;
    z-index: 2;
    background:  linear-gradient(135deg, var(--bg-primary) 0%, rgba(59, 130, 246, 0.1) 30%, rgba(16, 185, 129, 0.1) 70%, var(--bg-primary) 100%);
    overflow: hidden;
}

.tool-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
    animation: heroBackgroundPulse 8s ease-in-out infinite;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 3;
}

.hero-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100px;
    height: 100px;
    margin: 0 auto 30px auto;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    border-radius: 50%;
    box-shadow: 
        0 15px 35px rgba(59, 130, 246, 0.4),
        0 0 0 10px rgba(59, 130, 246, 0.1),
        0 0 0 20px rgba(59, 130, 246, 0.05);
    position: relative;
    overflow: hidden;
}



.hero-icon i {
    font-size: 3rem;
    color: white;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    animation: heroIconBounce 5s ease-in-out infinite;
    z-index: 2;
}


.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-color);
    margin: 0 0 20px 0;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, var(--text-color) 0%, var(--primary-color) 50%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: heroTitleShine 4s ease-in-out infinite;
}


.hero-content p {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    animation: heroDescriptionFade 3s ease-in-out infinite;
}

.main-content {
    min-height: 100vh;
}

.calculator-main {
    padding: 4rem 0;
    background: var(--bg-primary);
    min-height: calc(100vh - 200px);
}

.calculator-container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.tax-year-section {
    background: var(--bg-primary);
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.year-filing-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.calculator-tabs {
    display: flex;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}


.tab-button {
    flex: 1;
    min-width: 120px;
    padding: 1rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    white-space: nowrap;
}

.tab-button.active {
    background: var(--bg-primary);
    color: var(--primary-color);
    font-weight: 600;
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px 3px 0 0;
}

.calculator-card {
    padding: 2.5rem;
}

.input-section {
    display: none;
}

.input-section.active {
    display: block;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.9rem;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.input-error {
    border: 2px solid #F59E0B !important;
    background: #FFF8E1 !important;
}

.input-with-currency {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    z-index: 2;
}

.input-with-currency input {
    padding-left: 2.5rem;
}

.custom-tooltip {
    position: absolute;
    left: 0;
    top: 100%;
    margin-top: 2px;
    background: #222;
    color: #fff;
    border-radius: 8px;
    padding: 6px 14px;
    font-size: 1rem;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    white-space: nowrap;
    border-left: 4px solid #F59E0B;
    font-family: inherit;
}

.custom-tooltip.visible {
    opacity: 1;
    pointer-events: auto;
}

.deductions-section,
.credits-section {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.deductions-section h3,
.credits-section h3 {
    margin: 0 0 1rem 0;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
}

.deduction-toggle {
    display: flex;
    background: var(--bg-primary);
    border-radius: var(--radius-base);
    padding: 0.25rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.deduction-type {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-base);
    transition: all 0.3s ease;
}

.deduction-type.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.standard-deduction {
    text-align: center;
    padding: 2rem;
}

.standard-deduction.active {
    display: block;
}

.standard-deduction:not(.active) {
    display: none;
}

.deduction-amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.standard-deduction small {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.itemized-deductions {
    display: none;
}

.itemized-deductions.active {
    display: block;
}

.itemized-deductions .input-group {
    margin-bottom: 1rem;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.action-buttons .calculate-button,
.action-buttons .clear-button {
    flex: 1;
    margin-top: 0;
}

.calculate-button {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.clear-button {
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.calculate-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.clear-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(107, 114, 128, 0.3);
    background: linear-gradient(135deg, var(--danger-color) 0%, #DC2626 100%);
}

.calculate-button:active,
.clear-button:active {
    transform: translateY(0);
}

.calculate-button i,
.clear-button i {
    margin-right: 0.5rem;
}

.copy-results-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-base);
    padding: 0.5em 1.2em;
    font-size: 1em;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: background 0.2s;
    margin-bottom: 1em;
    margin-left: auto;
    margin-right: auto;
}

.copy-results-button:hover, .copy-results-button:focus {
    background: var(--accent-color);
    outline: none;
}

@media (max-width: 640px) {
    .action-buttons {
        flex-direction: column;
    }
}

.success-message {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 1rem;
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    border-radius: var(--radius-lg);
    font-weight: 500;
    animation: successSlideIn 0.3s ease-out;
    box-shadow: var(--shadow-md);
}

.success-message i {
    font-size: 1.2rem;
    opacity: 0.9;
}

@keyframes successSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-container {
    margin-top: 3rem;
    display: none;
}

.results-container.active {
    display: block;
    animation: fadeInUp 0.5s ease;
}

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

.result-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.result-card h3 {
    margin: 0 0 1rem 0;
    color: var(--text-color);
    font-size: 1.2rem;
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.tax-summary {
    display: grid;
    gap: 0.75rem;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.summary-item:last-child {
    border-bottom: none;
}

.summary-item .label {
    color: var(--text-secondary);
    font-weight: 500;
}

.summary-item .value {
    color: var(--text-color);
    font-weight: 600;
    font-size: 1.1rem;
}

.summary-item .value.highlight {
    color: var(--success-color);
    font-size: 1.3rem;
    font-weight: 700;
}

.tax-brackets {
    margin-bottom: 1.5rem;
}

.bracket-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-base);
    margin-bottom: 0.75rem;
    border-left: 4px solid var(--primary-color);
}

.bracket-rate {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.1rem;
    width: 60px;
}

.bracket-range {
    flex: 1;
    color: var(--text-secondary);
    margin: 0 1rem;
}

.bracket-tax {
    font-weight: 600;
    color: var(--text-color);
    background: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-base);
    border: 1px solid var(--border-color);
}

.bracket-explanation {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: var(--radius-base);
    border-left: 4px solid var(--secondary-color);
}

.bracket-explanation h4 {
    margin: 0 0 0.5rem 0;
    color: var(--text-color);
    font-size: 1rem;
}

.bracket-explanation p {
    margin: 0.25rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.recommendations {
    display: grid;
    gap: 1rem;
}

.recommendation-item {
    display: flex;
    align-items: flex-start;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-base);
    border-left: 4px solid var(--warning-color);
}

.recommendation-icon {
    width: 24px;
    height: 24px;
    background: var(--warning-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.recommendation-icon i {
    color: white;
    font-size: 0.8rem;
}

.recommendation-content h4 {
    margin: 0 0 0.25rem 0;
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 600;
}

.recommendation-content p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.4;
}

.comparison-chart {
    display: grid;
    gap: 1rem;
}

.comparison-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-base);
    text-align: center;
}

.comparison-item h4 {
    margin: 0 0 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.comparison-item .value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-color);
}

.comparison-item .change {
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.comparison-item .change.positive {
    color: var(--success-color);
}

.comparison-item .change.negative {
    color: var(--danger-color);
}

.withholding-inputs {
    display: grid;
    gap: 1.5rem;
}

.optimizer-content {
    text-align: center;
    padding: 2rem;
}

.optimization-results {
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.comparison-inputs {
    display: grid;
    gap: 1.5rem;
}

.comparison-inputs h3 {
    margin: 0 0 1rem 0;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .year-filing-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .calculator-tabs {
        flex-wrap: wrap;
    }
    
    .tab-button {
        flex: none;
        min-width: 100px;
        font-size: 0.8rem;
        padding: 0.75rem 1rem;
    }
    
    .calculator-card {
        padding: 1.5rem;
    }
    
    .summary-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
    
    .summary-item .value {
        font-size: 1rem;
    }
    
    .summary-item .value.highlight {
        font-size: 1.2rem;
    }
    
    .bracket-item {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    
    .bracket-rate,
    .bracket-range {
        width: 100%;
        margin: 0;
    }
    
    .comparison-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
}

@media (max-width: 768px) {    
    .hero-icon {
        width: 80px;
        height: 80px;
        margin: 0 auto 20px auto;
    }
    
    .hero-icon i {
        font-size: 2.5rem;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .hero-icon {
        width: 70px;
        height: 70px;
    }
    
    .hero-icon i {
        font-size: 2rem;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
        margin-bottom: 15px;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .calculator-main {
        padding: 2rem 0;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .calculator-card {
        padding: 1rem;
    }
    
    .deductions-section,
    .credits-section {
        padding: 1rem;
    }
    
    .result-card {
        padding: 1rem;
    }
}