:root {
    --bg-color: #f2f4f6;
    --card-bg: #ffffff;
    --primary-color: #0050FF;
    --primary-hover: #0040D0;
    --text-main: #191f28;
    --text-sub: #4e5968;
    --text-tip: #8b95a1;
    --border-color: #e5e8eb;
    --error-color: #f04452;
    
    --dot-pension: #ff5f2e;
    --dot-health: #3182f6;
    --dot-care: #60a5fa;
    --dot-employment: #22c55e;
    --dot-income: #a855f7;
    --dot-local: #ec4899;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.app-container {
    width: 100%;
    max-width: 500px;
    margin-top: 40px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

#main-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-sub);
    font-size: 1rem;
}

.calculator-card, .result-card {
    background-color: var(--card-bg);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
    margin-bottom: 20px;
}

.toggle-group {
    display: flex;
    background-color: #f9fafb;
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 24px;
}

.toggle-btn {
    flex: 1;
    border: none;
    background: transparent;
    padding: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-sub);
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.2s;
}

.toggle-btn.active {
    background-color: #ffffff;
    color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-sub);
    margin-bottom: 8px;
}

.input-wrapper {
    display: flex;
    align-items: center;
    background-color: #f9fafb;
    border-radius: 16px;
    padding: 12px 16px;
    border: 1px solid transparent;
    transition: border-color 0.2s;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
}

.input-wrapper input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-main);
    outline: none;
    text-align: right;
    width: 100%;
}

.input-wrapper .unit {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-sub);
    margin-left: 8px;
}

.advanced-settings {
    margin-bottom: 24px;
}

details {
    background-color: #f9fafb;
    border-radius: 16px;
    padding: 12px;
}

summary {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-sub);
    cursor: pointer;
    outline: none;
}

.details-content {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.input-group-sub {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.input-group-sub label {
    font-size: 0.9rem;
    color: var(--text-sub);
}

.input-wrapper-sub {
    display: flex;
    align-items: center;
    background-color: #ffffff;
    border-radius: 10px;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    width: 100px;
}

.input-wrapper-sub input {
    width: 100%;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    text-align: right;
    outline: none;
}

.input-wrapper-sub .unit {
    font-size: 0.85rem;
    color: var(--text-sub);
    margin-left: 4px;
}

.primary-btn {
    display: block;
    width: 100%;
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    border-radius: 16px;
    padding: 14px;
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.primary-btn:hover {
    background-color: var(--primary-hover);
}

.primary-btn:active {
    transform: scale(0.98);
}

/* Result Card */
.result-card.hidden {
    display: none;
}

.result-header {
    text-align: center;
    margin-bottom: 16px;
}

.result-header h2 {
    font-size: 1rem;
    color: var(--text-sub);
    font-weight: 600;
    margin-bottom: 4px;
}

.net-income-display {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-color);
}

.net-income-display .currency {
    font-size: 1.3rem;
    font-weight: 700;
    margin-left: 4px;
}

.result-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 16px 0;
}

.tax-breakdown h3 {
    font-size: 0.95rem;
    color: var(--text-main);
    margin-bottom: 8px;
}

.total-tax-display {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 16px;
}

.breakdown-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.item-name {
    display: flex;
    align-items: center;
    color: var(--text-sub);
}

.color-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 6px;
}

.color-dot.pension { background-color: var(--dot-pension); }
.color-dot.health { background-color: var(--dot-health); }
.color-dot.care { background-color: var(--dot-care); }
.color-dot.employment { background-color: var(--dot-employment); }
.color-dot.income { background-color: var(--dot-income); }
.color-dot.local { background-color: var(--dot-local); }

.item-value {
    font-weight: 600;
    color: var(--text-main);
}

/* Chart */
.chart-container {
    margin-top: 24px;
}

.chart-bar-track {
    display: flex;
    height: 16px;
    background-color: #f2f4f6;
    border-radius: 8px;
    overflow: hidden;
}

.chart-bar {
    height: 100%;
    transition: width 0.5s ease-out;
}

.net-income-bar {
    background-color: var(--primary-color);
}

.tax-bar {
    background-color: #e5e8eb;
}

.chart-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-sub);
    font-weight: 600;
    margin-top: 6px;
}

/* Adsense Placeholder */
.adsense-placeholder {
    background-color: #ffffff;
    border-radius: 16px;
    padding: 16px;
    text-align: center;
    color: var(--text-tip);
    font-size: 0.85rem;
    border: 1px dashed var(--border-color);
    margin-bottom: 20px;
}

footer {
    text-align: center;
    padding: 16px 0;
    font-size: 0.8rem;
    color: var(--text-tip);
}

.footer-disclaimer {
    margin-top: 4px;
    font-size: 0.7rem;
}

@media (max-width: 480px) {
    .app-container {
        margin-top: 20px;
    }
}

/* Main Tabs Navigation */
.main-tabs {
    display: flex;
    background-color: #e5e8eb;
    border-radius: 16px;
    padding: 6px;
    margin-bottom: 24px;
}

.main-tab-btn {
    flex: 1;
    border: none;
    background: transparent;
    padding: 12px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-sub);
    cursor: pointer;
    border-radius: 12px;
    transition: all 0.2s;
}

.main-tab-btn.active {
    background-color: #ffffff;
    color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.calc-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

.helper-text {
    font-size: 0.8rem;
    color: var(--text-tip);
    margin-top: 8px;
    margin-left: 4px;
}