:root {
    --bg-color: #f0f2f5;
    --container-bg: #fff;
    --container-bg-rgb: 255, 255, 255;
    --text-color: #333;
    --heading-color: #1a73e8;
    --accent-color: #1a73e8; /* Used for buttons and highlights */
    --hero-bg: #6499df;
    --hero-text: #ffffff;
    --input-bg: #fff;
    --input-border: #ccc;
    --input-text: #333;
    --button-bg: #1a73e8;
    --button-text: #fff;
    --result-bg: #f9f9f9;
    --result-border: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --article-bg: #ffffff;
    --article-text: #4a5568;
    --article-heading: #1a202c;
    --article-border: #edf2f7;
    --article-shadow: rgba(0, 0, 0, 0.08);
    --insight-bg: #f7fafc;
    --formula-bg: #fdfdfd;
    --outro-bg: #fdf2f2;
    --profit-bg: #fff5f5;
    --loss-bg: #f5f8ff;
    --profit-text: #f51f07;
    --loss-text: #1a73e8;
    --heading-color-rgb: 26, 115, 232;
}

.dark-mode {
    --bg-color: #1a1a1a;
    --container-bg: #2c2c2c;
    --container-bg-rgb: 44, 44, 44;
    --text-color: #f0f0f0;
    --heading-color: #4a90e2;
    --accent-color: #4a90e2;
    --hero-bg: #2d3250;
    --hero-text: #e0e0e0;
    --input-bg: #333;
    --input-border: #555;
    --input-text: #f0f0f0;
    --button-bg: #4a90e2;
    --button-text: #fff;
    --result-bg: #333;
    --result-border: #555;
    --shadow-color: rgba(255, 255, 255, 0.1);
    --article-bg: #2d3748;
    --article-text: #e2e8f0;
    --article-heading: #f7fafc;
    --article-border: #4a5568;
    --article-shadow: rgba(0, 0, 0, 0.3);
    --insight-bg: #3d4957;
    --formula-bg: #354151;
    --outro-bg: #4a3737;
    --profit-bg: #4a3737;
    --loss-bg: #373d4a;
    --profit-text: #ff6b6b;
    --loss-text: #4a90e2;
    --heading-color-rgb: 74, 144, 226;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.container {
    padding: 20px;
    background-color: var(--container-bg);
    border-radius: 12px;
    box-shadow: 0 10px 25px var(--shadow-color);
    margin-bottom: 40px; /* Space between sections */
}

h1, h2, h3 {
    color: var(--heading-color);
    text-align: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 3em;
}

h2 {
    font-size: 2em;
}

h3 {
    font-size: 1.5em;
}

p {
    font-size: 1em;
}

.button {
    display: inline-block;
    background-color: var(--button-bg);
    color: var(--button-text);
    padding: 12px 25px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1.1em;
    font-weight: bold;
    transition: background-color 0.3s ease, transform 0.2s ease;
    border: none;
    cursor: pointer;
}

.button:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    background-color: var(--hero-bg);
    color: var(--hero-text);
    text-align: center;
    padding: 50px 10px;
    margin-bottom: 40px;
    border-radius: 12px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.hero-content h1 {
    color: inherit;
    font-size: 3em;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-content p {
    font-size: 1.5em;
    max-width: 800px;
    margin: 0 auto 30px auto;
}

/* Articles Section */
.recent-articles-section h2 {
    margin-top: 40px;
    margin-bottom: 30px;
    text-align: center;
}

.article-cards-container, .article-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

/* Calculator Section */
.calculator-section {
    padding: 40px;
    background-color: var(--container-bg);
    border-radius: 12px;
    box-shadow: 0 10px 25px var(--shadow-color);
    margin-bottom: 40px;
    text-align: center;
}

.calculator-section h2 {
    font-size: 1.8em;
    margin-bottom: 20px;
}

.calculator-intro {
    max-width: 800px;
    margin: 0 auto 30px auto;
    font-size: 1.1em;
    line-height: 1.8;
}

.input-section {
    max-width: 500px;
    margin: 0 auto 30px auto;
    padding: 30px;
    background-color: var(--result-bg);
    border-radius: 8px;
    border: 1px solid var(--result-border);
}

.input-section h3 {
    text-align: center;
    margin-bottom: 25px;
    font-size: 1.6em;
}

.input-group {
    margin-bottom: 15px;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-color);
    opacity: 0.8;
}

.input-group input, .input-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 15px;
    box-sizing: border-box;
    background-color: var(--input-bg);
    color: var(--input-text);
    transition: background-color 0.3s, border-color 0.3s;
}

.label-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.currency-toggle-unified {
    display: flex;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 6px;
    padding: 2px;
}

.currency-toggle-unified .currency {
    padding: 4px 8px;
    cursor: pointer;
    border-radius: 4px;
    font-weight: bold;
    font-size: 14px;
    transition: background-color 0.2s, color 0.2s;
}

.currency-toggle-unified .currency.active {
    background-color: var(--heading-color);
    color: var(--button-text);
}

.currency-toggle-unified .currency:not(.active):hover {
    background-color: rgba(0,0,0,0.1);
}

#calculate-btn {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#calculate-btn:hover {
    opacity: 0.9;
}

.result-section {
    margin-top: 40px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    padding: 30px;
    background-color: var(--result-bg);
    border-radius: 8px;
    border: 1px solid var(--result-border);
}

.result-section h3 {
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
}

#result {
    text-align: left;
    font-size: 1.1em;
    line-height: 1.6;
}

#exchange-rate-status {
    font-size: 0.9em;
    color: var(--text-color);
    opacity: 0.7;
    margin-bottom: 15px;
    text-align: right;
}

.disclaimer-section {
    margin-top: 40px;
    padding: 20px;
    background-color: var(--result-bg);
    border-radius: 8px;
    border: 1px solid var(--result-border);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    text-align: left;
}

.disclaimer-section h3 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.5em;
}

/* About Us Section */
.about-us-section .container {
    text-align: center;
}

.about-us-section h1, .about-us-section h2 {
    margin-bottom: 30px;
}

.about-us-section ul {
    list-style: none;
    padding: 0;
    max-width: 800px;
    margin: 30px auto;
    text-align: left;
}

.about-us-section ul li {
    background-color: var(--result-bg);
    border-left: 5px solid var(--accent-color);
    margin-bottom: 15px;
    padding: 15px 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.team-member {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 40px auto;
    max-width: 600px;
    padding: 20px;
    background-color: var(--result-bg);
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--shadow-color);
    text-align: center;
}

.team-member .team-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
    border: 3px solid var(--accent-color);
}

.team-member h3 {
    margin-bottom: 5px;
    font-size: 1.8em;
}

.team-member .role {
    color: var(--heading-color);
    font-weight: bold;
    margin-bottom: 15px;
}

/* Contact Section */
.contact-section .container {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.contact-details {
    margin: 30px auto;
    padding: 20px;
    background-color: var(--result-bg);
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--shadow-color);
    text-align: center;
}

.contact-details h3 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.8em;
}

.contact-details p {
    font-size: 1.1em;
}

.contact-details a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: bold;
}

.contact-form-container {
    max-width: 600px;
    margin: 40px auto;
    padding: 30px;
    background-color: var(--result-bg);
    border-radius: 12px;
    box-shadow: 0 5px 15px var(--shadow-color);
}

.contact-form h3 {
    margin-top: 0;
    margin-bottom: 25px;
    font-size: 1.8em;
}

.contact-form .input-group {
    margin-bottom: 20px;
    text-align: left;
}

.contact-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-color);
    opacity: 0.8;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    width: calc(100% - 24px); /* Account for padding */
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    background-color: var(--input-bg);
    color: var(--input-text);
    transition: background-color 0.3s, border-color 0.3s;
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form button.button {
    width: 100%;
    padding: 15px;
    font-size: 1.2em;
}

/* General responsive adjustments */
@media (max-width: 768px) {
    h1 {
        font-size: 2.2em;
    }
    h2 {
        font-size: 1.8em;
    }
    h3 {
        font-size: 1.4em;
    }
    .hero-content h1 {
        font-size: 2.2em; /* Reduced for mobile */
        margin-bottom: 15px;
    }
    .hero-content p {
        font-size: 1.1em; /* Slightly smaller for mobile */
        padding: 0 10px;
    }
    .hero-section {
        padding: 40px 15px;
        margin-bottom: 25px;
    }
    .container {
        padding: 15px;
        margin-bottom: 20px;
    }
    main {
        padding: 10px;
    }
    .article-cards-container, .article-cards-grid {
        grid-template-columns: 1fr; /* Single column on small screens */
        gap: 20px;
    }
    .main-dashboard-content {
        margin: 20px 0;
        padding: 10px 0 40px 0;
    }
    .calculator-list-section, .home-articles-section {
        padding: 20px 15px;
    }
    .section-header h2 {
        font-size: 1.8em;
    }
    .input-section, .result-section, #total-tax-result {
        padding: 20px 15px; /* Reduced padding for mobile */
        margin-top: 20px;
    }
    .calculator-section {
        padding: 20px 15px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8em;
    }
    h2 {
        font-size: 1.6em;
    }
    .hero-content h1 {
        font-size: 1.8em;
    }
    .hero-content p {
        font-size: 0.95em;
    }
    .hero-section {
        padding: 30px 10px;
    }
    .button {
        padding: 10px 18px;
        font-size: 0.95em;
        width: 100%; /* Full width buttons on very small screens */
        box-sizing: border-box;
        text-align: center;
    }
    .calculator-tabs {
        padding: 5px;
    }
    .tab-button {
        padding: 10px;
        font-size: 0.9em;
    }
}

/* Calculator Tabs Styling */
.calculator-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    background-color: var(--container-bg);
    border-radius: 12px;
    box-shadow: 0 5px 15px var(--shadow-color);
    padding: 10px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.tab-button {
    background-color: transparent;
    border: none;
    padding: 12px 20px;
    font-size: 1em;
    font-weight: bold;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 8px;
    position: relative;
    outline: none;
}

.tab-button:hover {
    color: var(--heading-color);
    background-color: rgba(var(--heading-color-rgb, 26, 115, 232), 0.1); /* Use RGB for transparency */
}

.tab-button.active {
    color: var(--button-text);
    background-color: var(--heading-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Ensure a smooth color transition for --heading-color for hover/active states if it's a variable */
/* To make the above rgba work with CSS variables, define --heading-color-rgb */
:root {
    --heading-color-rgb: 26, 115, 232; /* Example RGB for #1a73e8 */
}
.dark-mode {
    --heading-color-rgb: 74, 144, 226; /* Example RGB for #4a90e2 */
}

.calculators-container {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--container-bg);
    border-radius: 12px;
    box-shadow: 0 10px 25px var(--shadow-color);
    padding: 20px;
}

.tab-content {
    padding: 20px;
    background-color: var(--container-bg);
    border-radius: 12px;
    /* This will be controlled by JavaScript for display: none/block */
}

.tab-content:not(.active) {
    display: none;
}

/* Adjustments for nested calculator-content */
.calculators-container .calculator-content {
    background-color: transparent; /* Remove background, it's now handled by .calculators-container */
    box-shadow: none; /* Remove shadow */
    padding: 0; /* Remove padding */
    margin-bottom: 0; /* Remove margin-bottom */
}
.calculators-container .calculator-content h2 {
    margin-top: 0;
}

/* Responsive adjustments for tabs */
@media (max-width: 768px) {
    .calculator-tabs {
        flex-direction: column;
        padding: 5px;
    }
    .tab-button {
        margin: 5px 0;
        width: 100%;
    }
}

.fee-info-text {
    color: var(--profit-text);
    font-size: 0.9em;
}

/* --- Stock Return Calculator - Professional UI Upgrade --- */
.sr-result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 25px;
}

.sr-result-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--container-bg);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--result-border);
    transition: transform 0.2s ease;
}

.sr-result-item:hover {
    transform: translateY(-2px);
}

.sr-label {
    font-size: 0.85em;
    color: var(--text-color);
    opacity: 0.6;
    margin-bottom: 8px;
}

.sr-value {
    font-size: 1.1em;
    font-weight: 700;
    color: var(--text-color);
}

/* Result Section Card Style */
#stock-return-calculator-tab-content .result-section {
    background-color: var(--container-bg); /* 배경색을 컨테이너 배경색으로 변경하여 피로도 감소 */
    border-radius: 16px; /* 물타기 계산기처럼 둥근 모서리 */
    box-shadow: 0 4px 12px var(--shadow-color);
    padding: 25px;
    margin-top: 30px;
    border: 1px solid var(--result-border); /* 은은한 테두리 추가 */
}

/* Final Result Box Emphasis */
#stock-return-calculator-tab-content .highlight-box {
    padding: 20px;
    border-radius: 16px; /* 물타기 계산기처럼 둥근 모서리 */
    margin-top: 25px;
    text-align: center;
    transition: all 0.3s ease;
    background-color: var(--container-bg);
    border: 1px solid var(--result-border);
}

#stock-return-calculator-tab-content .highlight-box p {
    margin: 5px 0;
}

#stock-return-calculator-tab-content .highlight-box .highlight-value {
    font-size: 1.8em;
    font-weight: 800; /* 조금 더 강조 */
    display: block;
    margin-top: 5px;
}

/* Conditional Background/Text Colors for Highlight Box (DCA 스타일 적용) */
#stock-return-calculator-tab-content .highlight-box.profit-background {
    background-color: var(--profit-bg);
}
#stock-return-calculator-tab-content .highlight-box.profit-background .highlight-value {
    color: var(--profit-text);
}

#stock-return-calculator-tab-content .highlight-box.loss-background {
    background-color: var(--loss-bg);
}
#stock-return-calculator-tab-content .highlight-box.loss-background .highlight-value {
    color: var(--loss-text);
}
/* New styles for Portfolio Tax Calculator */
.stock-input-group {
    background-color: var(--container-bg);
    border: 1px solid var(--result-border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.stock-input-group h3 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 1.4em;
    color: var(--heading-color);
}

.stock-input-group .input-group {
    margin-bottom: 15px;
}

.remove-stock-button {
    background-color: #d32f2f; /* Darker red for better accessibility contrast */
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.3s ease;
}

.remove-stock-button:hover {
    background-color: #b71c1c;
}

.button-delete {
    background-color: #d32f2f; /* Darker red for better accessibility contrast */
    color: #ffffff;
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.8em;
    transition: background-color 0.3s ease;
}

.button-delete:hover {
    background-color: #b71c1c;
}

.stock-divider {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0));
    margin: 1px 0;
}

.add-button {
    display: block;
    width: fit-content;
    margin: 20px auto;
    background-color: var(--accent-color);
    color: var(--button-text);
    padding: 12px 25px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1.1em;
    font-weight: bold;
    transition: background-color 0.3s ease, transform 0.2s ease;
    border: none;
    cursor: pointer;
}

.add-button:hover {
    background-color: var(--heading-color);
    transform: translateY(-2px);
}

/* Adjust .input-section specifically for the tax calculator to align content */
#tax-calculator-tab-content .input-section {
    max-width: 700px; /* Wider to accommodate multiple stock inputs */
    margin-left: auto;
    margin-right: auto;
    text-align: center; /* Center the add button and inputs visually */
}

/* Style for total tax result display */
#total-tax-result {
    margin-top: 40px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    padding: 30px;
    background-color: var(--result-bg);
    border-radius: 8px;
    border: 1px solid var(--result-border);
    text-align: left; /* Align text within the result box */
}

#total-tax-result h3 {
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
}
/* --- Compound Interest Calculator Enhanced UI --- */
.ci-summary-container {
    background-color: var(--container-bg);
    padding: 25px;
    border-radius: 16px;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.ci-summary-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--result-border);
}

.ci-summary-main .ci-label {
    font-size: 0.9em;
    color: var(--text-color);
    opacity: 0.6;
    margin-bottom: 10px;
}

.ci-final-value {
    font-size: 2.2em;
    font-weight: 800;
    color: var(--heading-color);
}

.ci-summary-sub {
    display: flex;
    justify-content: space-around;
    gap: 20px;
}

.ci-sub-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.ci-sub-label {
    font-size: 0.85em;
    color: var(--text-color);
    opacity: 0.6;
    margin-bottom: 5px;
}

.ci-sub-value {
    font-size: 1.2em;
    font-weight: 700;
}

.ci-sub-value.highlight {
    color: var(--profit-text);
}

.ci-table-wrapper {
    margin-top: 20px;
    overflow-x: auto;
}

.ci-yearly-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.95em;
}

.ci-yearly-table th {
    background-color: var(--result-bg);
    padding: 12px;
    text-align: center;
    font-weight: 700;
    border-bottom: 2px solid var(--result-border);
    position: sticky;
    top: 0;
}

.ci-yearly-table td {
    padding: 12px;
    border-bottom: 1px solid var(--result-border);
    text-align: right;
}

.ci-yearly-table td:first-child {
    text-align: center;
    color: var(--text-color);
    opacity: 0.7;
}

.ci-yearly-table tr:hover {
    background-color: rgba(var(--heading-color-rgb), 0.05);
}

.ci-value-profit {
    color: var(--profit-text);
    font-weight: 600;
}

/* Animation for number counting */
@keyframes countIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-count {
    animation: countIn 0.5s ease-out forwards;
}

@media (max-width: 480px) {
    .ci-final-value { font-size: 1.8em; }
    .ci-sub-value { font-size: 1.1em; }
    .ci-yearly-table { font-size: 0.85em; }
}

/* --- DCA Calculator Toss-style UI --- */
.dca-comparison-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--container-bg);
    padding: 20px;
    border-radius: 16px;
    margin-top: 10px;
}

.dca-comparison-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.dca-label {
    font-size: 0.85em;
    color: var(--text-color);
    opacity: 0.6;
    margin-bottom: 12px;
}

.dca-percentage {
    font-size: 1.1em;
    font-weight: 800;
    margin-bottom: 8px;
    padding: 6px 14px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.dca-percentage.profit {
    background-color: var(--profit-bg);
    color: var(--profit-text);
}

.dca-percentage.loss {
    background-color: var(--loss-bg);
    color: var(--loss-text);
}

.dca-price {
    font-size: 1em;
    font-weight: 600;
    color: var(--text-color);
    opacity: 0.9;
}

.dca-comparison-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 15px;
    color: var(--text-color);
    opacity: 0.3;
}

@media (max-width: 480px) {
    .dca-comparison-container {
        flex-direction: column;
        gap: 15px;
    }
    .dca-comparison-arrow {
        transform: rotate(90deg);
        padding: 5px 0;
    }
}

/* --- Dashboard Feature Cards (Toss Aesthetic) --- */
.main-dashboard-content {
    padding: 20px 0 80px 0;
    margin: 40px 0;
    border-radius: 40px;
    background: radial-gradient(circle at center, rgba(var(--heading-color-rgb), 0.15) 0%, transparent 85%);
    transition: background 0.3s ease;
}

.dark-mode .main-dashboard-content {
    background: radial-gradient(circle at center, rgba(var(--heading-color-rgb), 0.1) 0%, transparent 90%);
}

.calculator-list-section,
.home-articles-section {
    padding: 40px 40px;
    position: relative;
    background: transparent;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
    padding: 0 0 20px 0;
    position: relative;
}

.section-badge {
    display: inline-block;
    background-color: rgba(var(--heading-color-rgb), 0.1);
    color: var(--heading-color);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 2.5em;
    font-weight: 800;
    margin: 0 0 12px 0;
    background: linear-gradient(135deg, var(--heading-color), #4a90e2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
    text-align: center;
}

.section-header p {
    font-size: 1.2em;
    color: var(--text-color);
    opacity: 0.6;
    margin: 0;
    font-weight: 500;
    text-align: center;
}

.dark-mode .section-header h2 {
    background: linear-gradient(135deg, #4a90e2, #6ab0ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

@media (max-width: 768px) {
    .section-header h2 {
        font-size: 2.2em;
    }
    .section-header p {
        font-size: 1.1em;
    }
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    padding: 20px 0;
}

.feature-card {
    background-color: var(--container-bg);
    border-radius: 24px;
    padding: 32px;
    text-align: left;
    text-decoration: none;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02), 0 10px 20px rgba(0, 0, 0, 0.03);
    border: 1px solid var(--article-border);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow-color);
    border-color: var(--accent-color);
}

/* Icon Wrapper with Pastel Backgrounds */
.icon-box {
    width: 56px;
    height: 56px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 24px;
}

/* Specific Pastel Colors for Icons */
.icon-tax { background-color: #e7f0ff; } /* Light Blue */
.icon-compound { background-color: #e7fcf3; } /* Light Green */
.icon-dca { background-color: #f2efff; } /* Light Purple */
.icon-return { background-color: #fff9e7; } /* Light Yellow */

.feature-card h3 {
    text-align: left;
    margin: 0 0 12px 0;
    font-size: 1.4em;
    color: var(--text-color);
    font-weight: 700;
}

.feature-card p {
    margin: 0;
    font-size: 1em;
    color: var(--text-color);
    opacity: 0.6;
    line-height: 1.5;
}

.feature-card .go-link {
    margin-top: auto;
    padding-top: 24px;
    color: var(--accent-color);
    font-weight: 600;
    font-size: 0.95em;
    display: flex;
    align-items: center;
    gap: 4px;
}

.feature-card .go-link::after {
    content: '→';
    transition: transform 0.3s ease;
}

.feature-card:hover .go-link::after {
    transform: translateX(5px);
}

/* Dark mode adjustments for icons */
.dark-mode .icon-box {
    opacity: 0.9;
}
.dark-mode .icon-tax { background-color: #1e3a5f; }
.dark-mode .icon-compound { background-color: #1b4d3e; }
.dark-mode .icon-dca { background-color: #2d2654; }
.dark-mode .icon-return { background-color: #4d441b; }

.article-content-section {
    background-color: var(--article-bg);
    padding: 60px;
    margin: 40px auto;
    border-radius: 24px;
    box-shadow: 0 10px 30px var(--shadow-color);
    border: 1px solid var(--article-border);
    max-width: 900px;
}

.article-header {
    border-bottom: 1px solid var(--article-border);
    margin-bottom: 40px;
    padding-bottom: 25px;
    text-align: left;
}

.article-header h1 {
    text-align: center;
    margin-bottom: 10px;
    font-size: 2em;
    color: var(--article-heading);
}

.article-body h2 {
    text-align: left;
    margin-top: 45px;
    margin-bottom: 20px;
    font-size: 1.5em;
    color: var(--heading-color);
}

.article-body p {
    font-size: 1.12em;
    line-height: 1.85;
    margin-bottom: 25px;
    color: var(--article-text);
}

.article-body li {
    font-size: 1.1em;
    margin-bottom: 15px;
    color: var(--article-text);
}

.insight-box {
    background-color: var(--insight-bg);
    padding: 25px;
    border-left: 4px solid var(--accent-color);
    border-radius: 8px;
    margin: 35px 0;
    color: var(--article-text);
}

.formula-box {
    background-color: var(--formula-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--article-border);
    margin: 35px 0;
    text-align: center;
    color: var(--article-heading);
}

.outro {
    background-color: var(--outro-bg);
    padding: 30px;
    border-radius: 12px;
    margin-top: 40px;
    border: 1px solid var(--article-border);
}

.outro h3 {
    color: var(--heading-color);
    margin-top: 0;
}

@media (max-width: 768px) {
    .article-content-section {
        padding: 35px 20px;
        margin: 20px 10px;
        border-radius: 12px;
    }
    .article-header h1 {
        font-size: 2em;
    }
}