* {
    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;
}

.logo-container {
    flex-shrink: 0;
}

.security-badge {
    background: #17191b;
    padding: 8px 16px;
    border-radius: 20px;
}

.pgp-verified {
    color: #FFFFFF;
    font-size: 12px;
    font-weight: bold;
    letter-spacing: 1px;
}

.main-nav {
    background: #17191b;
    margin: 20px -20px;
    border-radius: 8px;
}

.main-nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 15px;
}

.main-nav li {
    margin: 0 20px;
}

.main-nav a {
    color: #FFFFFF;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.hero {
    text-align: center;
    padding: 80px 0;
    background: linear-gradient(135deg, #17191b 0%, #313c48 100%);
    margin: 30px -20px;
    border-radius: 15px;
    color: #FFFFFF;
}

.hero-title {
    font-size: 2.8rem;
    margin-bottom: 15px;
    font-weight: 300;
    letter-spacing: 2px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.3rem;
    opacity: 0.9;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 50px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.intro-content {
    padding: 60px 0;
    border-bottom: 1px solid #e9ecef;
}

.intro-content h2 {
    text-align: left;
    margin-bottom: 30px;
    font-size: 2.2rem;
}

.intro-content p {
    margin-bottom: 25px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 40px;
}

.content-block h3 {
    margin-bottom: 15px;
    color: #17191b;
    font-size: 1.4rem;
}

.content-block p {
    line-height: 1.7;
}

.links-section, .validator-section, .platform-features, .security-protocols, .user-guide, .support-section {
    margin: 80px 0;
}

h2 {
    font-size: 2.3rem;
    margin-bottom: 20px;
    text-align: center;
    font-weight: 300;
}

.section-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px;
    font-size: 1.1rem;
    color: #313c48;
    line-height: 1.7;
}

.security-notice-box {
    background: #f8f9fa;
    border-left: 4px solid #313c48;
    padding: 25px;
    margin: 30px 0;
    border-radius: 0 8px 8px 0;
}

.security-notice-box h4 {
    margin-bottom: 10px;
    color: #17191b;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.link-card {
    background: #FFFFFF;
    border: 2px solid #17191b;
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.link-card:hover {
    border-color: #313c48;
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(49, 60, 72, 0.15);
}

.link-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.link-status {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #4CAF50;
    margin-right: 10px;
    animation: pulse 2s infinite;
}

.link-number {
    font-weight: bold;
    color: #313c48;
    font-size: 1.1rem;
}

.link-latency {
    font-size: 0.85rem;
    color: #666;
    margin-left: auto;
}

.link-url {
    word-break: break-all;
    background: #f8f9fa;
    padding: 18px;
    border-radius: 8px;
    font-family: monospace;
    cursor: pointer;
    border: 1px solid #e9ecef;
    transition: all 0.3s ease;
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.link-url:hover {
    background: #e9ecef;
    border-color: #313c48;
}

.link-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 0.8rem;
    color: #666;
}

.meta-item {
    background: #f1f3f4;
    padding: 4px 8px;
    border-radius: 4px;
}

.copy-btn {
    width: 100%;
    padding: 14px;
    background: #17191b;
    color: #FFFFFF;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s ease;
    font-size: 1rem;
}

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

.validator-card {
    background: #FFFFFF;
    border: 2px solid #17191b;
    border-radius: 12px;
    padding: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.validator-info {
    text-align: center;
    margin-bottom: 30px;
}

.validator-info h4 {
    margin-bottom: 15px;
    color: #17191b;
    font-size: 1.3rem;
}

.validator-input-group {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.validator-input-group input {
    flex: 1;
    padding: 18px;
    border: 2px solid #17191b;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.validator-input-group input:focus {
    outline: none;
    border-color: #313c48;
}

.validator-input-group button {
    padding: 18px 35px;
    background: #17191b;
    color: #FFFFFF;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s ease;
    font-size: 1rem;
}

.validator-input-group button:hover {
    background: #313c48;
}

.validation-result {
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
    font-size: 1.1rem;
    display: none;
}

.validation-result.valid {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.validation-result.invalid {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #FFFFFF;
    border: 2px solid #17191b;
    border-radius: 12px;
    padding: 35px 30px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: #313c48;
    transform: translateY(-5px);
}

.feature-card h3 {
    margin-bottom: 20px;
    color: #17191b;
    font-size: 1.4rem;
}

.feature-card p {
    color: #313c48;
    line-height: 1.6;
    margin-bottom: 15px;
}

.feature-list {
    list-style: none;
    margin-top: 15px;
}

.feature-list li {
    padding: 8px 0;
    border-bottom: 1px solid #f1f3f4;
    position: relative;
    padding-left: 20px;
}

.feature-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4CAF50;
    font-weight: bold;
}

.security-content {
    display: grid;
    gap: 30px;
}

.protocol-item {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 12px;
    border-left: 4px solid #313c48;
}

.protocol-item h3 {
    margin-bottom: 15px;
    color: #17191b;
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.step {
    background: #FFFFFF;
    border: 2px solid #17191b;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    position: relative;
}

.step-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: #17191b;
    color: #FFFFFF;
    border-radius: 50%;
    line-height: 40px;
    font-weight: bold;
    margin-bottom: 20px;
}

.step h4 {
    margin-bottom: 15px;
    color: #17191b;
}

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

.support-card {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
}

.support-card h4 {
    margin-bottom: 15px;
    color: #17191b;
}

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

.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: #FFFFFF;
    font-size: 1.2rem;
}

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

.footer-section li {
    padding: 8px 0;
    border-bottom: 1px solid #313c48;
}

.footer-notice {
    grid-column: 1 / -1;
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #313c48;
}

.disclaimer {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 15px;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    .validator-input-group {
        flex-direction: column;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 10px;
    }
    
    header {
        flex-direction: column;
        gap: 20px;
    }
    
    .link-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .link-latency {
        margin-left: 0;
    }
}