/* =========================================
   PREMIUM TAX CALCULATOR - APPLE INSPIRED
   ========================================= */

:root {
    /* Match Form Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    
    /* Background & Surface */
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --surface-light: #f8fafc;
    
    /* Text */
    --text-main: #0f172a;
    --text-sub: #64748b;
    --text-muted: #94a3b8;
    
    /* Status Colors */
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    
    /* Chart Colors */
    --chart-green: #22c55e;
    --chart-orange: #f59e0b;
    --chart-blue: #3b82f6;
    --chart-red: #ef4444;
    --chart-gray: #cbd5e1;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 400ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* =========================================
   CALCULATOR CONTAINER
   ========================================= */
.calculator-wrapper {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    padding: 40px 20px;
    box-sizing: border-box;
}

.calculator-container {
    background: var(--card-bg);
    max-width: 1000px;
    margin: 0 auto;
    padding: 48px;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* =========================================
   HEADER SECTION
   ========================================= */
.calc-header {
    text-align: center;
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 2px solid var(--border-color);
}

.calc-header h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-main);
    margin: 0 0 12px 0;
    letter-spacing: -0.8px;
}

.calc-header p {
    font-size: 17px;
    color: var(--text-sub);
    margin: 0;
    line-height: 1.5;
}

/* =========================================
   INPUT SECTION - CARDS LAYOUT
   ========================================= */
.calc-inputs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.calc-input-card {
    background: var(--surface-light);
    padding: 28px;
    border-radius: 16px;
    border: 2px solid transparent;
    transition: all var(--transition-base);
}

.calc-input-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.calc-input-card.focused {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.calc-input-label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
}

.calc-input-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.calc-input-field {
    position: relative;
}

.calc-input-field input {
    width: 100%;
    padding: 16px 20px 16px 48px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-main);
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    transition: all var(--transition-base);
    box-sizing: border-box;
}

.calc-input-field input:hover {
    border-color: #cbd5e1;
}

.calc-input-field input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.currency-symbol {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-muted);
    pointer-events: none;
}

/* Helper Text */
.calc-input-helper {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
    font-weight: 500;
}

/* =========================================
   DISCOUNT SECTION
   ========================================= */
.calc-discounts {
    background: var(--surface-light);
    padding: 32px;
    border-radius: 16px;
    margin-bottom: 40px;
}

.calc-discounts h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    margin: 0 0 24px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.discount-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
    align-items: start;
}

.discount-item {
    background: white;
    padding: 20px 24px;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
    transition: all var(--transition-base);
}

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

.discount-item label {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 12px;
}

.discount-item select {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-main);
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--transition-base);
}

.discount-item select:hover {
    border-color: #cbd5e1;
}

.discount-item select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Checkbox Switch */
.switch-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.switch-label {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
    flex: 1;
}

.switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #cbd5e1;
    transition: var(--transition-smooth);
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition-smooth);
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.switch input:checked + .slider {
    background-color: var(--primary-color);
}

.switch input:checked + .slider:before {
    transform: translateX(24px);
}

.slider:hover {
    background-color: #94a3b8;
}

.switch input:checked + .slider:hover {
    background-color: var(--primary-hover);
}

/* =========================================
   CALCULATE BUTTON
   ========================================= */
.calc-button-wrapper {
    text-align: center;
    margin: 40px 0;
}

.calc-button {
    background: var(--primary-color);
    color: white;
    padding: 18px 48px;
    font-size: 18px;
    font-weight: 700;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    position: relative;
    overflow: hidden;
}

.calc-button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.45);
}

.calc-button:active {
    transform: translateY(0);
}

.calc-button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.calc-button:active::before {
    width: 300px;
    height: 300px;
}

/* =========================================
   RESULTS SECTION
   ========================================= */
.calc-results {
    display: none;
    animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.calc-results.active {
    display: block;
}

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

/* Quick Stats Cards */
.calc-stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.calc-stat-card {
    background: linear-gradient(135deg, var(--surface-light) 0%, white 100%);
    padding: 32px;
    border-radius: 18px;
    border: 2px solid #e2e8f0;
    text-align: center;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.calc-stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
    transform: scaleX(0);
    transition: transform 0.5s ease;
}

.calc-stat-card:hover::before {
    transform: scaleX(1);
}

.calc-stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.calc-stat-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-sub);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 12px;
}

.calc-stat-value {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -1px;
    margin-bottom: 8px;
    animation: countUp 0.6s ease;
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.calc-stat-sublabel {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Net Income Card - Special Styling */
.calc-stat-card.net-income {
    background: linear-gradient(135deg, #ecfdf5 0%, white 100%);
}

.calc-stat-card.net-income::before {
    background: linear-gradient(90deg, var(--success-color), #34d399);
}

.calc-stat-card.net-income .calc-stat-value {
    color: var(--success-color);
}

/* Total Tax Card */
.calc-stat-card.total-tax {
    background: linear-gradient(135deg, #fef2f2 0%, white 100%);
}

.calc-stat-card.total-tax::before {
    background: linear-gradient(90deg, var(--danger-color), #f87171);
}

.calc-stat-card.total-tax .calc-stat-value {
    color: var(--danger-color);
}

/* =========================================
   CHART TABS
   ========================================= */
.chart-tabs-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 32px;
    gap: 12px;
}

.chart-tab {
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-sub);
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    cursor: pointer;
    transition: all var(--transition-base);
}

.chart-tab:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.chart-tab.active {
    color: white;
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

/* =========================================
   CHART CONTAINERS
   ========================================= */
.chart-view {
    display: none;
    background: var(--surface-light);
    padding: 40px;
    border-radius: 18px;
    border: 2px solid #e2e8f0;
}

.chart-view.active {
    display: block;
    animation: chartFadeIn 0.4s ease;
}

@keyframes chartFadeIn {
    from {
        opacity: 0;
        transform: scale(0.98);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.chart-canvas-wrapper {
    position: relative;
    height: 400px;
    background: white;
    padding: 24px;
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
}

/* Chart Legend Styling */
.chart-canvas-wrapper canvas {
    max-height: 100%;
}

/* =========================================
   BREAKDOWN DETAILS
   ========================================= */
.breakdown-details {
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.breakdown-item {
    background: white;
    padding: 20px 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-base);
}

.breakdown-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.breakdown-item-label {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 12px;
}

.breakdown-color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.breakdown-item-value {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-main);
}

/* Color variants */
.breakdown-item.green { border-left-color: var(--chart-green); }
.breakdown-item.orange { border-left-color: var(--chart-orange); }
.breakdown-item.blue { border-left-color: var(--chart-blue); }
.breakdown-item.red { border-left-color: var(--chart-red); }
.breakdown-item.gray { border-left-color: var(--chart-gray); }

.breakdown-color-dot.green { background: var(--chart-green); }
.breakdown-color-dot.orange { background: var(--chart-orange); }
.breakdown-color-dot.blue { background: var(--chart-blue); }
.breakdown-color-dot.red { background: var(--chart-red); }
.breakdown-color-dot.gray { background: var(--chart-gray); }

/* =========================================
   RESPONSIVE DESIGN
   ========================================= */
@media (max-width: 768px) {
    .calculator-container {
        padding: 32px 24px;
        border-radius: 20px;
    }

    .calc-header h2 {
        font-size: 28px;
    }

    .calc-inputs-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .discount-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .calc-stats-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .calc-stat-value {
        font-size: 32px;
    }

    .chart-tabs-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .chart-tab {
        width: 100%;
        text-align: center;
    }

    .chart-canvas-wrapper {
        height: 300px;
        padding: 16px;
    }

    .breakdown-details {
        grid-template-columns: 1fr;
    }

    .calc-button {
        width: 100%;
        padding: 16px 32px;
    }
}

@media (max-width: 480px) {
    .calculator-container {
        padding: 24px 20px;
    }

    .calc-header h2 {
        font-size: 24px;
    }

    .calc-input-card {
        padding: 20px;
    }

    .calc-discounts {
        padding: 24px;
    }

    .calc-stat-card {
        padding: 24px;
    }

    .chart-view {
        padding: 24px;
    }
}

/* =========================================
   LOADING STATES
   ========================================= */
.calc-loading {
    display: none;
    text-align: center;
    padding: 40px;
}

.calc-loading.active {
    display: block;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 16px;
    color: var(--text-sub);
    font-weight: 500;
}