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

body {
    font-family: 'Roboto', sans-serif;
    background: #001a2e;
    color: #d5f3ff;
    line-height: 1.7;
    position: relative;
}

.ocean-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #003d5c 0%, #006d9e 50%, #0088cc 100%);
    z-index: -1;
}

.top-banner {
    background: rgba(0, 96, 150, 0.4);
    backdrop-filter: blur(15px);
    text-align: center;
    padding: 2.5rem 1rem;
    border-bottom: 2px solid rgba(79, 195, 247, 0.3);
}

.brand-title {
    font-size: 3rem;
    color: #80d8ff;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.brand-subtitle {
    color: #b3e5fc;
    font-size: 1.1rem;
}

.two-column-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    max-width: 1400px;
    margin: 0 auto;
    gap: 2rem;
    padding: 2rem 1.5rem;
}

.sidebar-nav {
    background: rgba(1, 87, 155, 0.3);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(79, 195, 247, 0.3);
    border-radius: 15px;
    padding: 2rem 1.5rem;
    height: fit-content;
    position: sticky;
    top: 2rem;
}

.sidebar-nav h3 {
    color: #4fc3f7;
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: rgba(3, 169, 244, 0.2);
    padding: 1rem 1.2rem;
    border-radius: 10px;
    color: #e1f5fe;
    text-decoration: none;
    border: 1px solid transparent;
    transition: all 0.3s;
    font-weight: 500;
}

.nav-link span {
    font-size: 1.5rem;
}

.nav-link:hover {
    background: rgba(3, 169, 244, 0.4);
    border-color: #4fc3f7;
    transform: translateX(8px);
}

.main-content-area {
    min-height: 100vh;
}

.welcome-banner {
    background: rgba(1, 87, 155, 0.3);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(79, 195, 247, 0.3);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.welcome-banner h2 {
    color: #4fc3f7;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.welcome-banner p {
    color: #e1f5fe;
    font-size: 1.1rem;
    line-height: 1.8;
}

.content-article {
    background: rgba(1, 87, 155, 0.25);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(79, 195, 247, 0.2);
    border-radius: 15px;
    padding: 3rem 2.5rem;
}

.content-article section {
    margin-bottom: 2.5rem;
}

.content-article h2 {
    color: #4fc3f7;
    font-size: 1.9rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid rgba(79, 195, 247, 0.3);
    padding-bottom: 0.8rem;
}

.content-article h3 {
    color: #80d8ff;
    font-size: 1.4rem;
    margin: 1.5rem 0 1rem;
}

.content-article p {
    color: #e1f5fe;
    line-height: 1.9;
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.content-article ul,
.content-article ol {
    list-style-position: inside;
    padding-left: 1rem;
}

.content-article li {
    background: rgba(3, 169, 244, 0.15);
    padding: 1rem 1.5rem;
    margin-bottom: 0.8rem;
    border-radius: 10px;
    border-left: 4px solid #4fc3f7;
    color: #e1f5fe;
    line-height: 1.7;
}

.content-article strong {
    color: #b3e5fc;
    font-weight: 600;
}

.content-img {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 15px;
    display: block;
    margin: 2rem 0;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    border: 2px solid rgba(79, 195, 247, 0.3);
}

@media (max-width: 968px) {
    .two-column-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar-nav {
        position: relative;
        top: 0;
    }
    
    .brand-title {
        font-size: 2rem;
    }
}