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

@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&display=swap');

body {
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: #ffffff;
}

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

header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.header-top {
    margin-bottom: 1.2rem;
}

.back-link {
    color: #555;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.3s;
    position: relative;
    display: inline-block;
}

.back-link::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #000;
    transition: width 0.3s;
}

.back-link:hover {
    color: #000;
}

.back-link:hover::before {
    width: 100%;
}

header h1 {
    font-size: 1.75rem;
    color: #000;
    margin-bottom: 1.2rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 2.5rem;
    font-weight: 800;
    color: #000;
    letter-spacing: -1px;
    margin-bottom: 1.2rem;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid rgba(0, 0, 0, 0.08);
}

.tab-button {
    padding: 0.8rem 1.8rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: #666;
    transition: all 0.3s;
}

.tab-button:hover {
    color: #000;
    background: rgba(0, 0, 0, 0.02);
}

.tab-button.active {
    color: #000;
    border-bottom-color: #000;
}

main {
    padding: 3.5rem 0;
}

.tab-content {
    display: none;
    background-color: #fff;
    padding: 3.5rem;
    border-radius: 20px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.06);
}

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

.content h1 {
    font-size: 2.8rem;
    color: #000;
    margin-bottom: 0.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.last-updated {
    color: #666;
    font-style: italic;
    margin-bottom: 2.5rem;
    font-weight: 500;
}

.intro {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    padding: 1.5rem;
    background-color: rgba(0, 0, 0, 0.02);
    border-left: 4px solid #000;
    border-radius: 8px;
    font-weight: 500;
    line-height: 1.7;
}

section {
    margin-bottom: 2.5rem;
}

h2 {
    font-size: 1.9rem;
    color: #000;
    margin-bottom: 1.2rem;
    padding-bottom: 0.6rem;
    border-bottom: 2px solid rgba(0, 0, 0, 0.1);
    font-weight: 700;
    letter-spacing: -0.5px;
}

h3 {
    font-size: 1.3rem;
    color: #1a1a1a;
    margin-top: 1.8rem;
    margin-bottom: 0.9rem;
    font-weight: 700;
}

p {
    margin-bottom: 1rem;
}

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

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

li {
    margin-bottom: 0.5rem;
}

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

.contact-email a {
    color: #000;
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid #000;
    transition: opacity 0.3s;
}

.contact-email a:hover {
    opacity: 0.7;
}

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

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

footer {
    background-color: #000;
    color: #fff;
    padding: 2.5rem 0;
    text-align: center;
    margin-top: 5rem;
}

@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;
    }

    .logo {
        font-size: 2rem;
    }
}