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

:root {
    --primary-color: #0066cc;
    --primary-dark: #004499;
    --secondary-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --border-color: #dee2e6;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--dark-text);
    line-height: 1.6;
    background-color: #ffffff;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px 0;
    box-shadow: var(--shadow);
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 24px;
    margin-bottom: 5px;
}

.tagline {
    font-size: 12px;
    opacity: 0.9;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
}

/* Navigation */
.navbar {
    background-color: var(--light-bg);
    border-bottom: 2px solid var(--border-color);
    top: 80px;
    z-index: 99;
}

.nav-menu {
    display: flex;
    list-style: none;
    flex-wrap: wrap;
    gap: 0;
}

.nav-menu li {
    flex: 1;
    min-width: 150px;
}

.nav-menu a {
    display: block;
    padding: 15px 10px;
    color: var(--dark-text);
    text-decoration: none;
    text-align: center;
    border-right: 1px solid var(--border-color);
    transition: var(--transition);
    font-weight: 500;
    font-size: 14px;
}

.nav-menu a:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--info-color) 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
    margin-bottom: 40px;
}

.hero h2 {
    font-size: 36px;
    margin-bottom: 20px;
    font-weight: 700;
	color:white !important;
}

.hero-subtitle {
    font-size: 18px;
    margin-bottom: 15px;
    opacity: 0.95;
}

.update-date {
    font-size: 14px;
    opacity: 0.8;
}

/* Main Content */
.main-content {
    padding: 40px 0;
}

section {
    margin-bottom: 60px;
}

h2 {
    font-size: 32px;
    margin-bottom: 30px;
    color: var(--dark-text);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 15px;
}

h3 {
    font-size: 22px;
    margin-bottom: 20px;
    color: var(--dark-text);
}

h4 {
    font-size: 18px;
    margin-bottom: 15px;
}

/* Table of Contents */
.toc {
    background-color: var(--light-bg);
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    margin-bottom: 30px;
    border-radius: 5px;
}

.toc ul {
    list-style: none;
}

.toc li {
    margin-bottom: 10px;
}

.toc a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.toc a:hover {
    text-decoration: underline;
}

/* Intro Section */
.intro-article {
    background-color: white;
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 30px;
}

.intro-article p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.intro-list {
    list-style: none;
    margin: 20px 0;
}

.intro-list li {
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
}

.intro-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 18px;
}

.expert-note {
    background-color: #e7f3ff;
    border-left: 4px solid var(--info-color);
    padding: 20px;
    border-radius: 5px;
    margin-top: 30px;
}

.expert-note h4 {
    color: var(--info-color);
    margin-bottom: 10px;
}

/* Types Grid */
.types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.type-card {
    background-color: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    transition: var(--transition);
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.05);
}

.type-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
    transform: translateY(-5px);
}

.type-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.type-card ul {
    list-style: none;
    margin: 15px 0;
}

.type-card li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.type-card li:before {
    content: "•";
    position: absolute;
    left: 5px;
    color: var(--secondary-color);
    font-weight: bold;
}

/* Rating Cards */
.rating-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.rating-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    transition: var(--transition);
    position: relative;
}

.rating-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
    transform: translateY(-5px);
}

.rating-card.featured {
    background: linear-gradient(135deg, #fff9e6 0%, #fffbf0 100%);
    border: 3px solid var(--warning-color);
    padding: 25px;
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.rating-card.featured .card-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.rating-badge {
    background-color: var(--warning-color);
    color: var(--dark-text);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
    display: inline-block;
    margin-bottom: 10px;
}

.rating-badge.featured {
    background-color: var(--secondary-color);
    color: white;
}

.rating-card h3,
.rating-card h4 {
    margin: 15px 0;
    color: var(--dark-text);
}

.rating-stars {
    display: inline-block;
    color: var(--warning-color);
    font-weight: bold;
    margin-right: 10px;
}

.rating-votes {
    color: #666;
    font-size: 14px;
}

.card-badges {
    display: flex;
    gap: 10px;
    margin: 15px 0;
    flex-wrap: wrap;
}

.badge-universal,
.badge-eco,
.badge-support {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: bold;
}

.badge-universal {
    background-color: #e3f2fd;
    color: var(--info-color);
}

.badge-eco {
    background-color: #e8f5e9;
    color: var(--secondary-color);
}

.badge-support {
    background-color: #fce4ec;
    color: #c2185b;
}

.card-intro {
    margin: 15px 0;
    font-size: 15px;
    line-height: 1.7;
}

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

.card-cell h5 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 14px;
}

.card-cell ul {
    list-style: none;
}

.card-cell li {
    padding: 6px 0;
    padding-left: 15px;
    position: relative;
    font-size: 14px;
}

.card-cell li:before {
    content: "›";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 16px;
}

.quick-info {
    list-style: none;
    margin: 15px 0;
}

.quick-info li {
    padding: 8px 0;
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
}

.quick-info li:last-child {
    border-bottom: none;
}

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

.cta-button-primary,
.cta-button-secondary {
    margin-top: 20px;
}

.cta-button-primary a,
.cta-button-secondary a {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: var(--transition);
    margin-right: 10px;
}

.cta-button-primary a {
    background-color: var(--secondary-color);
    color: white;
}

.cta-button-primary a:hover {
    background-color: #218838;
    transform: scale(1.05);
}

.cta-button-secondary a {
    background-color: var(--primary-color);
    color: white;
}

.cta-button-secondary a:hover {
    background-color: var(--primary-dark);
}

/* Comparison Table */
.table-responsive {
    overflow-x: auto;
    margin-bottom: 20px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
    box-shadow: var(--shadow);
    border-radius: 8px;
    overflow: hidden;
}

.comparison-table thead {
    background-color: var(--primary-color);
    color: white;
}

.comparison-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    border-right: 1px solid rgba(255, 255, 255, 0.2);
}

.comparison-table th:last-child {
    border-right: none;
}

.comparison-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table tbody tr {
    transition: var(--transition);
}

.comparison-table tbody tr:hover {
    background-color: var(--light-bg);
}

.comparison-table tbody tr:last-child td {
    border-bottom: none;
}

.comparison-table .highlighted-row {
    background-color: #fffacd;
}

.comparison-table .highlighted-row td {
    font-weight: 600;
}

.table-legend {
    background-color: var(--light-bg);
    padding: 15px;
    border-radius: 5px;
    margin-top: 15px;
}

.table-legend p {
    margin-bottom: 10px;
    font-weight: 600;
}

.table-legend ul {
    list-style: none;
    columns: 2;
}

.table-legend li {
    padding: 5px 0;
}

/* Advantages Section */
.pros-cons-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.pros-block,
.cons-block {
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.pros-block h3 {
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.cons-block h3 {
    color: var(--danger-color);
    margin-bottom: 20px;
}

.advantages-list,
.disadvantages-list {
    list-style: none;
}

.advantages-list li,
.disadvantages-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    padding-left: 25px;
    position: relative;
}

.advantages-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
    font-size: 18px;
}

.disadvantages-list li:before {
    content: "✕";
    position: absolute;
    left: 0;
    color: var(--danger-color);
    font-weight: bold;
    font-size: 18px;
}

.advantages-list li:last-child,
.disadvantages-list li:last-child {
    border-bottom: none;
}

.advantages-list strong,
.disadvantages-list strong {
    color: var(--dark-text);
}

/* How to Choose Section */
.steps-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

.step-card {
    background: white;
    border: 2px solid var(--border-color);
    border-left: 5px solid var(--primary-color);
    padding: 25px;
    border-radius: 8px;
    transition: var(--transition);
}

.step-card:hover {
    box-shadow: var(--shadow);
    transform: translateX(10px);
}

.step-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.step-number {
    font-size: 24px;
    min-width: 40px;
}

.step-card ul {
    list-style: none;
    margin: 15px 0;
}

.step-card li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.step-card li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.formula-box {
    background-color: var(--light-bg);
    padding: 15px;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    margin: 15px 0;
    overflow-x: auto;
}

.formula-box p {
    margin: 5px 0;
    font-size: 13px;
}

.checklist {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 20px 0;
}

.checklist label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
}

.checklist input[type="checkbox"] {
    margin-top: 5px;
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.checklist span {
    font-size: 15px;
    line-height: 1.5;
}

.recommendation-box {
    background-color: #e8f5e9;
    border-left: 4px solid var(--secondary-color);
    padding: 20px;
    border-radius: 5px;
    margin-top: 20px;
}

.recommendation-box h4 {
    color: var(--secondary-color);
    margin-bottom: 10px;
}

/* Calculator */
.calculator-section {
    background-color: var(--light-bg);
    padding: 30px;
    border-radius: 8px;
    margin-bottom: 40px;
}

.calculator {
    background: white;
    padding: 25px;
    border-radius: 8px;
    max-width: 600px;
    margin: 20px auto;
}

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

.calc-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-text);
}

.calc-group input {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 15px;
    transition: var(--transition);
}

.calc-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 5px rgba(0, 102, 204, 0.2);
}

.calc-button {
    width: 100%;
    padding: 12px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.calc-button:hover {
    background-color: #218838;
    transform: scale(1.02);
}

.calc-result {
    background-color: #e8f5e9;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.calc-result h3 {
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 15px;
}

.result-item.total {
    border-bottom: none;
    border-top: 2px solid rgba(0, 0, 0, 0.2);
    padding-top: 15px;
    font-size: 16px;
    margin-top: 10px;
}

/* FAQ */
.faq-items {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.faq-item {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    cursor: pointer;
    transition: var(--transition);
}

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

.faq-item summary {
    user-select: none;
    padding-right: 20px;
    position: relative;
    font-size: 15px;
}

.faq-item summary:before {
    content: "+";
    position: absolute;
    right: 0;
    font-size: 20px;
    font-weight: bold;
    color: var(--primary-color);
}

.faq-item[open] summary:before {
    content: "−";
}

.faq-answer {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: #555;
    line-height: 1.8;
}

.faq-answer p {
    margin-bottom: 15px;
}

.faq-answer ul {
    list-style: none;
    margin-left: 20px;
}

.faq-answer li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.faq-answer li:before {
    content: "•";
    position: absolute;
    left: 5px;
    color: var(--primary-color);
    font-weight: bold;
}

.faq-answer ol {
    margin-left: 20px;
}

.faq-answer ol li {
    padding: 8px 0;
}

/* How to Apply Section */
.application-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.app-step {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    text-align: center;
    transition: var(--transition);
}

.app-step:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
    transform: translateY(-5px);
}

.step-icon {
    font-size: 32px;
    margin-bottom: 15px;
}

.app-step h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.app-step ul {
    text-align: left;
    list-style: none;
}

.app-step li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    font-size: 14px;
}

.app-step li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.timeline-note {
    background-color: var(--light-bg);
    padding: 20px;
    border-radius: 8px;
    margin-top: 30px;
}

.timeline-note h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

/* Additional Content */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.content-card {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.content-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.content-card ul {
    list-style: none;
}

.content-card li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.content-card li:before {
    content: "•";
    position: absolute;
    left: 5px;
    color: var(--secondary-color);
    font-weight: bold;
}

.quick-links a {
    color: var(--primary-color);
    text-decoration: none;
}

.quick-links a:hover {
    text-decoration: underline;
}

.verification-list li:before {
    content: "☑";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
}

/* Conclusion */
.conclusion-content {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.conclusions-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin: 20px 0;
}

.conclusion-item {
    background-color: var(--light-bg);
    padding: 20px;
    border-left: 4px solid var(--primary-color);
    border-radius: 5px;
}

.conclusion-item strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: 10px;
    font-size: 16px;
}

.conclusion-item p {
    color: #555;
    line-height: 1.7;
}

.final-recommendation {
    background: linear-gradient(135deg, #fff9e6 0%, #fffbf0 100%);
    border: 2px solid var(--warning-color);
    padding: 25px;
    border-radius: 8px;
    margin-top: 30px;
    text-align: center;
}

.final-recommendation h3 {
    color: var(--dark-text);
    margin-bottom: 15px;
}

.final-recommendation p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 15px;
}

/* Footer */
.footer {
    background-color: var(--dark-text);
    color: white;
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h4 {
    color: var(--warning-color);
    margin-bottom: 15px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

.footer-section p {
    color: #ccc;
    line-height: 1.8;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #aaa;
}

/* Responsive Design */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        background-color: var(--light-bg);
        border-top: 2px solid var(--border-color);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        flex: none;
        min-width: auto;
    }

    .nav-menu a {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .hero h2 {
        font-size: 24px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    h2 {
        font-size: 24px;
    }

    h3 {
        font-size: 18px;
    }

    .types-grid,
    .rating-cards-grid {
        grid-template-columns: 1fr;
    }

    .rating-card.featured {
        grid-column: 1;
    }

    .rating-card.featured {
        grid-template-columns: 1fr;
    }

    .rating-card.featured .card-grid {
        grid-template-columns: 1fr;
    }

    .pros-cons-grid {
        grid-template-columns: 1fr;
    }

    .table-responsive {
        font-size: 12px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 10px 5px;
    }

    .header-content {
        flex-direction: column;
        gap: 10px;
    }

    .navbar {
        top: 60px;
    }

    .calculator {
        padding: 20px;
    }

    .steps-container {
        grid-template-columns: 1fr;
    }

    .table-legend ul {
        columns: 1;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }

    .hero h2 {
        font-size: 20px;
    }

    h2 {
        font-size: 20px;
    }

    h3 {
        font-size: 16px;
    }

    .rating-card {
        padding: 15px;
    }

    .type-card,
    .content-card,
    .app-step {
        padding: 15px;
    }

    .conclusion-content,
    .intro-article {
        padding: 15px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 8px 4px;
    }

    table th {
        font-size: 11px;
    }

    table td {
        font-size: 12px;
    }

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