/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.65;
    letter-spacing: -0.011em;
    color: #425466;
    background-color: #fafbfc;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 96px 24px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 96px;
}

h1 {
    font-family: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 2.75rem;
    font-weight: 600;
    color: #0a2540;
    margin-bottom: 24px;
    letter-spacing: -0.025em;
    line-height: 1.15;
}

.intro {
    font-size: 1.125rem;
    color: #425466;
    max-width: 580px;
    margin: 0 auto;
    line-height: 1.7;
    font-weight: 400;
}

/* Main sections */
main {
    margin-bottom: 96px;
}

section {
    margin-bottom: 120px;
}

h2 {
    font-family: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: #0a2540;
    margin-bottom: 40px;
    letter-spacing: -0.019em;
}

/* Protocol list - clean vertical list */
.protocol-list {
    list-style: none;
    padding: 0;
    margin: 0;
    border-radius: 8px;
    overflow: hidden;
}

.protocol-list li {
    transition: all 0.2s ease;
    position: relative;
}

.protocol-list li:nth-child(odd) {
    background-color: #f8fafc;
}

.protocol-list li:nth-child(even) {
    background-color: #ffffff;
}

.protocol-list li:hover {
    background-color: #e0e7ff;
}

.protocol-list li:hover a {
    color: #4338ca;
}

.protocol-list li:hover .external-link-icon {
    opacity: 1;
}

.protocol-list a {
    text-decoration: none;
    color: #0a2540;
    font-weight: 500;
    font-size: 14px;
    display: flex;
    align-items: center;
    padding: 14px 16px;
    transition: color 0.2s ease;
    cursor: pointer;
}

.protocol-list .shield-icon {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    margin-right: 12px;
    color: #6366f1;
}

.protocol-list .protocol-name {
    flex-grow: 1;
}

.protocol-list .external-link-icon {
    flex-shrink: 0;
    width: 14px;
    height: 14px;
    margin-left: 12px;
    opacity: 0;
    transition: opacity 0.2s ease;
    color: #4338ca;
}

/* CTA Section */
.cta {
    text-align: center;
    padding: 48px 0;
    margin: 120px 0;
}

.cta-button {
    display: inline-block;
    background-color: #635bff;
    color: #ffffff;
    padding: 14px 32px;
    border: none;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: all 0.15s ease;
    letter-spacing: -0.006em;
    box-shadow: 0 1px 3px rgba(50, 50, 93, 0.15), 0 1px 0 rgba(0, 0, 0, 0.02);
}

.cta-button:hover {
    background-color: #5851e8;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(50, 50, 93, 0.2), 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* FAQ Section */
.faq {
    margin-top: 120px;
}

.faq-item {
    margin-bottom: 56px;
}

.faq-item:last-child {
    margin-bottom: 0;
}

.faq-item h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #0a2540;
    margin-bottom: 12px;
    letter-spacing: -0.014em;
}

.faq-item p {
    color: #425466;
    line-height: 1.7;
    font-size: 1rem;
}

.faq-item a {
    color: #635bff;
    text-decoration: none;
    transition: color 0.12s ease;
}

.faq-item a:hover {
    color: #5851e8;
}

/* Footer */
footer {
    text-align: center;
    padding-top: 72px;
    margin-top: 120px;
    border-top: 1px solid #e3e8ee;
    color: #6b7c93;
}

footer p {
    margin: 6px 0;
}

footer strong {
    color: #425466;
    font-size: 0.9375rem;
    font-weight: 600;
}

.footer-credit {
    font-size: 0.875rem;
    color: #6b7c93;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 72px 20px;
    }

    h1 {
        font-size: 2.25rem;
    }

    .intro {
        font-size: 1.0625rem;
    }

    h2 {
        font-size: 1.375rem;
    }

    section {
        margin-bottom: 96px;
    }

    .protocol-list a {
        padding: 18px 0;
        font-size: 0.9375rem;
    }

    .cta {
        padding: 40px 0;
        margin: 96px 0;
    }

    .cta-button {
        padding: 13px 28px;
        font-size: 0.9rem;
    }

    .faq {
        margin-top: 96px;
    }

    .faq-item {
        margin-bottom: 48px;
    }

    .faq-item h3 {
        font-size: 1.0625rem;
    }

    .faq-item p {
        font-size: 0.9375rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 56px 20px;
    }

    h1 {
        font-size: 1.875rem;
    }

    header {
        margin-bottom: 72px;
    }

    section {
        margin-bottom: 80px;
    }

    .cta {
        margin: 80px 0;
    }

    .faq {
        margin-top: 80px;
    }
}