:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
}

[data-theme="light"] {
    --background-color: #ffffff;
    --surface-color: #f8fafc;
    --text-color: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
}

[data-theme="light"] .link {
    color: var(--primary-color);
    background-color: var(--surface-color);
    border-color: var(--primary-color);
}

[data-theme="light"] .link:hover {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

[data-theme="light"] .warning-stat {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

ul, ol {
    margin-left: 1.5rem;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: all 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

.header {
    background-color: var(--surface-color);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.theme-toggle, .language-toggle {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover, .language-toggle:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

.main-content {
    padding: 2rem 0;
    flex: 1;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
}

.section {
    margin-bottom: 3rem;
    padding: 2rem;
    background-color: var(--surface-color);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
}

.section h2 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.section h3 {
    color: var(--primary-color);
    margin: 1.5rem 0 1rem 0;
    font-size: 1.4rem;
}

.warning-stat {
    background: linear-gradient(135deg, var(--warning-color), #f97316);
    color: white;
    padding: 1.5rem;
    border-radius: 1rem;
    margin: 1.5rem 0;
    text-align: center;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
    border: 2px solid var(--warning-color);
}

.warning-stat p {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.5;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.benefit-card {
    background-color: var(--background-color);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.benefit-card h4 {
    color: var(--success-color);
    margin-bottom: 1rem;
}

.benefit-card ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.benefit-card li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.5;
}

.benefit-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
    font-size: 1.1rem;
}

.contribution-methods {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.method-card {
    background-color: var(--background-color);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    position: relative;
}

.method-card h4 {
    color: var(--warning-color);
    margin-bottom: 0.5rem;
}

.method-card.recommended {
    border-color: var(--success-color);
    border-width: 2px;
}

.method-card.recommended::before {
    content: "⭐ Recommended";
    position: absolute;
    top: -10px;
    left: 20px;
    background: var(--success-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
}

.link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    display: inline-block;
    margin: 0.5rem 0;
    padding: 0.5rem 1rem;
    background-color: var(--background-color);
    border: 2px solid var(--accent-color);
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.link:hover {
    background-color: var(--accent-color);
    color: var(--background-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(245, 158, 11, 0.3);
}

.guidelines {
    background-color: var(--background-color);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border-left: 4px solid var(--success-color);
}

.guidelines ul {
    list-style: none;
    padding-left: 0;
}

.guidelines li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.guidelines li::before {
    content: "✅";
    position: absolute;
    left: 0;
}

.footer {
    background-color: var(--surface-color);
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
    padding-left: 0;
    margin-left: 0;
}

.footer-section li {
    margin-bottom: 0.5rem;
    margin-left: 0;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.language-content {
    display: none;
}

.language-content.active {
    display: block;
}

.divider {
    text-align: center;
    margin: 3rem 0;
    color: var(--text-secondary);
    font-size: 1.2rem;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: row;
        gap: 0.5rem;
        align-items: center;
    }

    .logo {
        font-size: 1.2rem;
    }

    .controls {
        flex-direction: row;
        gap: 0.5rem;
    }

    .theme-toggle, .language-toggle {
        padding: 0.5rem;
        font-size: 1rem;
        min-width: 40px;
        min-height: 40px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .section {
        padding: 1rem;
    }

    .contribution-methods {
        grid-template-columns: 1fr;
    }

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

    .method-card {
        margin: 0;
        width: 100%;
        box-sizing: border-box;
    }

    .method-card.recommended::before {
        left: 10px;
        font-size: 0.7rem;
        padding: 0.2rem 0.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-section {
        text-align: center;
    }
}

.flag-counter {
    margin-top: 2rem;
}