/* ===== CSS Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #2563EB;
    --success-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --text-dark: #2D3436;
    --text-light: #7F8C8D;
    --card-bg: #FFFFFF;
    --border-color: #E0E0E0;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(37, 99, 235, 0.12);
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #FFFFFF;
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* ===== Ads ===== */
.ad-container {
    margin: var(--spacing-md) auto;
    min-height: 100px;
    text-align: center;
    overflow: hidden;
}

.top-ad {
    margin-bottom: var(--spacing-md);
}

.bottom-ad {
    margin-top: var(--spacing-lg);
}

/* ===== Header ===== */
.main-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.main-header h1 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    font-weight: 900;
}

.subtitle {
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.btn-share-header {
    background: var(--card-bg);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
    margin-top: var(--spacing-sm);
}

.btn-share-header:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--card-bg);
}

/* ===== Calculator Section ===== */
.calculator-section {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-lg);
}

.exchange-rate-display {
    background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary-color);
}

.exchange-rate-display span {
    font-size: 1.1rem;
    color: var(--text-dark);
}

.exchange-rate-display strong {
    color: var(--primary-color);
    font-size: 1.3rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.form-group input {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group small {
    margin-top: 0.25rem;
    font-size: 0.85rem;
    color: var(--text-light);
}

/* ===== Info Groups ===== */
.info-group {
    background: linear-gradient(135deg, #F9FAFB 0%, #F3F4F6 100%);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border: 2px solid var(--border-color);
}

.info-group h3 {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

/* Transaction Rows */
.transaction-row {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.transaction-row:last-child {
    margin-bottom: 0;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    align-items: end;
    position: relative;
}

/* Remove Button */
.btn-remove {
    background: var(--danger-color);
    color: var(--card-bg);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    margin-top: auto;
}

.btn-remove:hover {
    background: #DC2626;
    transform: scale(1.1);
}

/* Secondary Button */
.btn-secondary {
    background: var(--card-bg);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
    margin-top: var(--spacing-sm);
}

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


/* ===== Buttons ===== */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #1E40AF);
    color: var(--card-bg);
    width: 100%;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
}

.btn-share:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-link {
    display: inline-block;
    margin-top: 10px;
    padding: 0.5rem 1rem;
    background: #FFFFFF;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.btn-link:hover {
    background: var(--primary-color);
    color: #FFFFFF;
    transform: translateY(-2px);
}

/* ===== Result Section ===== */
.result-section {
    display: none;
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.5s ease;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-section h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
    text-align: center;
}

/* Calculation Steps */
.calculation-steps {
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.calculation-steps h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.calculation-steps ol {
    list-style: none;
    padding: 0;
}

.calculation-steps li {
    padding: 0.5rem 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-dark);
    border-bottom: 1px solid rgba(37, 99, 235, 0.1);
}

.calculation-steps li:last-child {
    border-bottom: none;
    font-weight: 700;
    color: var(--primary-color);
}

/* Result Summary */
.result-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-card {
    background: linear-gradient(135deg, #F9FAFB 0%, #F3F4F6 100%);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.result-card.highlight {
    background: linear-gradient(135deg, #DBEAFE 0%, #BFDBFE 100%);
    border: 2px solid var(--primary-color);
}

.result-card h3 {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.result-card .amount {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--primary-color);
    margin: var(--spacing-xs) 0;
}

.result-card small {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Tax Breakdown */
.tax-breakdown {
    background: #FEF3C7;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--warning-color);
}

.tax-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid rgba(245, 158, 11, 0.2);
}

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

.tax-item.total {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 2px solid var(--warning-color);
    font-size: 1.1rem;
    font-weight: 700;
}

.tax-item span {
    color: var(--text-dark);
}

.tax-item strong {
    color: var(--danger-color);
}

/* Net Profit */
.net-profit {
    background: linear-gradient(135deg, #D1FAE5 0%, #A7F3D0 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    border: 2px solid var(--success-color);
}

.net-profit h3 {
    color: var(--success-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.net-profit .amount {
    font-size: 2rem;
    font-weight: 900;
    color: var(--success-color);
}

/* Result Actions */
.result-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.result-actions .btn {
    flex: 1;
    min-width: 200px;
}

/* ===== Info Section ===== */
.info-section {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
}

.info-section h2 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 700;
}

.info-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.info-card {
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.info-card h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.info-card p {
    font-size: 0.9rem;
    color: var(--text-dark);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.info-card ul {
    margin-left: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.info-card li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-dark);
}

.info-card strong {
    color: var(--primary-color);
}

/* ===== Footer ===== */
.main-footer {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-dark);
    color: var(--card-bg);
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transition: bottom 0.3s ease;
    font-weight: 500;
}

.toast.show {
    bottom: 30px;
}

/* ===== Layout & Sidebar ===== */
.layout-container {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.main-column {
    flex: 3;
    min-width: 0;
    /* Flexbox item overflow fix */
}

.app-sidebar {
    flex: 1;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    top: 2rem;
}

/* Sidebar Card Style */
.sidebar-card {
    background: #FFFFFF;
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease;
}

.sidebar-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.sidebar-card h3 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #E5E7EB;
    font-weight: 700;
}

.sidebar-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-list li {
    margin-bottom: 0.8rem;
}

.sidebar-list li:last-child {
    margin-bottom: 0;
}

.sidebar-list a {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    text-decoration: none;
    color: var(--text-dark);
    padding: 0.8rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    background: linear-gradient(135deg, #F9FAFB 0%, #F3F4F6 100%);
    border: 1px solid transparent;
}

.sidebar-list a:hover {
    background: #FFFFFF;
    border-color: var(--primary-color);
    transform: translateX(5px);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.link-icon {
    font-size: 1.2rem;
}

.link-content {
    display: flex;
    flex-direction: column;
}

.link-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-dark);
}

.sidebar-list a:hover .link-title {
    color: var(--primary-color);
}

.link-desc {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-top: 0.3rem;
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
    .layout-container {
        flex-direction: column;
    }

    .app-sidebar {
        width: 100%;
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .sidebar-card {
        flex: 1;
        min-width: 250px;
    }

    .main-column {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .app-sidebar {
        flex-direction: column;
    }

    .container {
        padding: var(--spacing-sm);
    }

    .main-header h1 {
        font-size: 1.5rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .btn-remove {
        position: absolute;
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        margin-top: 0;
    }

    .result-summary {
        grid-template-columns: 1fr;
    }

    .info-content {
        grid-template-columns: 1fr;
    }

    .result-actions {
        flex-direction: column;
    }

    .result-actions .btn {
        width: 100%;
    }
}

/* ===== FAQ Accordion ===== */
details {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

details:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

summary {
    cursor: pointer;
    list-style: none;
    /* Hide default triangle */
    font-size: 0.95rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

summary::-webkit-details-marker {
    display: none;
}

summary strong {
    color: var(--text-dark);
}

details[open] summary {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

details p {
    border-left: 2px solid var(--primary-color);
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ===== Ad Container Fix (Additional) ===== */
.ad-container {
    display: block !important;
    width: 100% !important;
    max-width: 100% !important;
    overflow: visible !important;
    text-align: center;
    box-sizing: border-box;
    margin: 2rem auto;
    padding: 0 !important;
}

.ad-container iframe,
.ad-container ins {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
}

/* ===== History Section ===== */
.history-section {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary-color);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid #E5E7EB;
}

.history-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: underline;
}

.btn-text:hover {
    color: var(--danger-color);
}

.history-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: #F9FAFB;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.history-item.clickable {
    cursor: pointer;
}

.history-item.clickable:hover {
    background: #F3F4F6;
    border-color: var(--primary-color);
}

.history-content {
    flex: 1;
}

.history-date {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 4px;
}

.history-summary {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
}

.history-value {
    color: var(--primary-color);
}

.btn-delete-item {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #ccc;
    cursor: pointer;
    padding: 0 0 0 1rem;
    transition: color 0.2s;
    line-height: 1;
}

.btn-delete-item:hover {
    color: var(--danger-color);
}