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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 1.5rem;
    color: #2563eb;
    margin-bottom: 1rem;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid #e5e7eb;
}

.tab-button {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    color: #666;
    transition: all 0.3s;
}

.tab-button:hover {
    color: #2563eb;
}

.tab-button.active {
    color: #2563eb;
    border-bottom-color: #2563eb;
}

main {
    padding: 3rem 0;
}

.tab-content {
    display: none;
    background-color: #fff;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

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

.content h1 {
    font-size: 2.5rem;
    color: #1a1a1a;
    margin-bottom: 0.5rem;
}

.last-updated {
    color: #666;
    font-style: italic;
    margin-bottom: 2rem;
}

.intro {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: #f0f7ff;
    border-left: 4px solid #2563eb;
    border-radius: 4px;
}

section {
    margin-bottom: 2.5rem;
}

h2 {
    font-size: 1.75rem;
    color: #1a1a1a;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e5e7eb;
}

h3 {
    font-size: 1.25rem;
    color: #374151;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
}

ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
}

.contact-email {
    font-size: 1.1rem;
}

.contact-email a {
    color: #2563eb;
    text-decoration: none;
}

.contact-email a:hover {
    text-decoration: underline;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: #666;
}

.empty-state h2 {
    border: none;
    margin-bottom: 0.5rem;
}

footer {
    background-color: #1f2937;
    color: #fff;
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
}

@media (max-width: 768px) {
    .tab-content {
        padding: 1.5rem;
    }

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

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.15rem;
    }

    .tabs {
        flex-direction: column;
    }

    .tab-button {
        text-align: left;
        border-bottom: 1px solid #e5e7eb;
        border-left: 3px solid transparent;
    }

    .tab-button.active {
        border-bottom-color: #e5e7eb;
        border-left-color: #2563eb;
    }
}