.guide-container {
    display: flex;
    max-width: 1200px;
    margin: 2rem auto;
    gap: 2.5rem;
    padding: 0 2rem;
}

.guide-sidebar {
    width: 280px;
    flex-shrink: 0;
}

.guide-nav {
    position: sticky;
    top: 2rem;
    background: white;
    padding: 1.8rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.guide-nav:hover {
    transform: translateY(-2px);
}

.guide-nav h3 {
    margin-bottom: 1.5rem;
    color: #1a73e8;
    font-size: 1.2rem;
    font-weight: 600;
    border-bottom: 2px solid #e8f0fe;
    padding-bottom: 0.8rem;
}

.guide-nav ul {
    list-style: none;
    padding: 0;
}

.guide-nav ul ul {
    padding-left: 1.8rem;
    margin-top: 0.8rem;
    border-left: 2px solid #e8f0fe;
}

.guide-nav li {
    margin-bottom: 0.8rem;
}

.guide-nav a {
    color: #5f6368;
    text-decoration: none;
    display: block;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 0.95rem;
}

.guide-nav a:hover {
    color: #1a73e8;
    background: #f8f9fc;
}

.guide-nav a.active {
    color: #1a73e8;
    background: #e8f0fe;
    font-weight: 500;
}

.guide-content {
    flex: 1;
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.guide-content section {
    margin-bottom: 4rem;
}

.guide-content h2 {
    color: #1a73e8;
    margin-bottom: 2rem;
    padding-bottom: 0.8rem;
    border-bottom: 2px solid #e8f0fe;
    font-size: 1.8rem;
}

.guide-content h3 {
    color: #202124;
    margin: 2.5rem 0 1.2rem;
    font-size: 1.4rem;
}

.guide-content p {
    color: #5f6368;
    line-height: 1.7;
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
}

.guide-content ul {
    padding-left: 1.8rem;
    color: #5f6368;
    line-height: 1.7;
}

.guide-content li {
    margin-bottom: 0.8rem;
}

.guide-image {
    max-width: 100%;
    height: auto;
    margin: 1.5rem 0;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    transition: transform 0.3s ease;
}

.guide-image:hover {
    transform: translateY(-4px);
}

@media screen and (max-width: 1024px) {
    .guide-container {
        flex-direction: column;
        padding: 0 1rem;
    }

    .guide-sidebar {
        width: 100%;
    }

    .guide-nav {
        position: relative;
        top: 0;
    }
}

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

    .guide-content h2 {
        font-size: 1.6rem;
    }

    .guide-content h3 {
        font-size: 1.3rem;
    }

    .guide-content p, 
    .guide-content li {
        font-size: 1rem;
    }
}