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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #FFFFFF;
    color: #17191b;
    line-height: 1.6;
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 30px 0;
    border-bottom: 2px solid #313c48;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    height: 44px;
    width: 413px;
}

.main-nav {
    display: flex;
    gap: 30px;
}

.main-nav a {
    text-decoration: none;
    color: #17191b;
    font-weight: 500;
    transition: color 0.3s;
    padding: 8px 16px;
    border-radius: 6px;
}

.main-nav a:hover {
    color: #313c48;
    background: #f8f9fa;
}

.security-badge .pgp-verified {
    background: #313c48;
    color: #FFFFFF;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 1px;
}

.hero {
    text-align: center;
    padding: 80px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    margin: 40px 0;
    border-radius: 20px;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 20px;
    color: #17191b;
    letter-spacing: 1.5px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 50px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #313c48;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.about-marketplace {
    margin: 80px 0;
}

.about-marketplace h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2.2rem;
    color: #17191b;
}

.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 50px;
    align-items: start;
}

.text-content p {
    margin-bottom: 25px;
    font-size: 1.1rem;
    line-height: 1.8;
    color: #444;
}

.tech-specs {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 15px;
    border-left: 4px solid #313c48;
}

.tech-specs h3 {
    margin-bottom: 20px;
    color: #17191b;
}

.tech-specs ul {
    list-style: none;
}

.tech-specs li {
    padding: 10px 0;
    border-bottom: 1px solid #e9ecef;
    position: relative;
    padding-left: 20px;
}

.tech-specs li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: #313c48;
}

.link-validator {
    background: #fff;
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin: 60px 0;
}

.link-validator h2 {
    color: #17191b;
    margin-bottom: 15px;
    text-align: center;
    font-size: 2rem;
}

.validator-description {
    color: #666;
    margin-bottom: 30px;
    text-align: center;
    font-size: 1.1rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.validator-container {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

#linkInput {
    flex: 1;
    padding: 18px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s;
}

#linkInput:focus {
    outline: none;
    border-color: #313c48;
}

#validateBtn, .copy-btn {
    background: #17191b;
    color: #FFFFFF;
    border: none;
    padding: 18px 30px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: background-color 0.3s;
    white-space: nowrap;
}

#validateBtn:hover, .copy-btn:hover {
    background: #313c48;
}

.validation-result {
    padding: 20px;
    border-radius: 10px;
    margin: 20px 0;
    font-weight: bold;
    text-align: center;
    font-size: 1.1rem;
}

.validation-result.valid {
    background: #d4edda;
    color: #155724;
    border: 2px solid #c3e6cb;
}

.validation-result.invalid {
    background: #f8d7da;
    color: #721c24;
    border: 2px solid #f5c6cb;
}

.hidden {
    display: none;
}

.official-links {
    margin: 70px 0;
}

.official-links h2 {
    margin-bottom: 15px;
    color: #17191b;
    text-align: center;
    font-size: 2rem;
}

.section-description {
    text-align: center;
    color: #666;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.1rem;
}

.links-grid {
    display: grid;
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.link-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 2px solid #e9ecef;
    transition: all 0.3s;
}

.link-card:hover {
    background: #e9ecef;
    border-color: #313c48;
    transform: translateY(-2px);
}

.link-content {
    display: flex;
    align-items: center;
    gap: 20px;
    flex: 1;
}

.link-url {
    word-break: break-all;
    font-family: monospace;
    color: #17191b;
    font-size: 1.1rem;
}

.copy-link {
    background: #313c48;
    color: #FFFFFF;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background-color 0.3s;
}

.copy-link:hover {
    background: #17191b;
}

.link-status {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
}

.link-status.online {
    background: #d4edda;
    color: #155724;
}

.security-features {
    margin: 80px 0;
    padding: 60px 0;
    background: #f8f9fa;
    border-radius: 20px;
}

.security-features h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.2rem;
    color: #17191b;
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}

.security-item {
    background: #fff;
    padding: 35px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
}

.security-item h3 {
    color: #17191b;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.security-item p {
    color: #666;
    line-height: 1.7;
}

.marketplace-features {
    margin: 80px 0;
}

.marketplace-features h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.2rem;
    color: #17191b;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 35px;
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s;
    border: 1px solid #f0f0f0;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.feature-card h3 {
    color: #17191b;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.feature-card p {
    color: #666;
    line-height: 1.7;
}

.user-guide {
    margin: 80px 0;
    padding: 60px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 20px;
}

.user-guide h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.2rem;
    color: #17191b;
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.step {
    background: #fff;
    padding: 35px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.step h3 {
    color: #313c48;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.step p {
    color: #666;
    line-height: 1.7;
}

.technical-specs {
    margin: 80px 0;
}

.technical-specs h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.2rem;
    color: #17191b;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    max-width: 900px;
    margin: 0 auto;
}

.spec-item {
    text-align: center;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 12px;
    transition: transform 0.3s;
}

.spec-item:hover {
    transform: translateY(-5px);
}

.spec-item h4 {
    color: #313c48;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.spec-item p {
    color: #17191b;
    font-weight: 600;
    font-size: 1.1rem;
}

.support-section {
    margin: 80px 0;
    padding: 60px;
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.support-section h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.2rem;
    color: #17191b;
}

.support-section > p {
    text-align: center;
    color: #666;
    margin-bottom: 50px;
    font-size: 1.1rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.support-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.support-item {
    text-align: center;
    padding: 30px;
}

.support-item h3 {
    color: #17191b;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.support-item p {
    color: #666;
    line-height: 1.7;
}

footer {
    background: #17191b;
    color: #FFFFFF;
    padding: 60px 0 30px;
    margin-top: 80px;
    border-radius: 20px 20px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    margin-bottom: 20px;
    color: #fff;
    font-size: 1.2rem;
}

.footer-section p, .footer-section li {
    color: #ccc;
    margin-bottom: 10px;
    line-height: 1.6;
}

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

.footer-section li {
    position: relative;
    padding-left: 15px;
}

.footer-section li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: #313c48;
}

.security-notice {
    grid-column: 1 / -1;
    background: #313c48;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    margin-top: 20px;
    font-size: 0.95rem;
    line-height: 1.6;
}

.copyright {
    grid-column: 1 / -1;
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #313c48;
    color: #999;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .validator-container {
        flex-direction: column;
    }
    
    .link-card {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .main-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    header {
        flex-direction: column;
        text-align: center;
    }
    
    .feature-grid, .security-grid, .support-features {
        grid-template-columns: 1fr;
    }
    
    .user-guide, .support-section {
        padding: 40px 20px;
    }
}