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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #0033a0 0%, #003087 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.main-nav {
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 1.5rem;
    z-index: 1000;
}

.main-nav a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.main-nav a:hover {
    text-decoration: underline;
}

main {
    padding: 3rem 20px;
    flex: 1;
}

.hero {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 2rem 1.5rem;
    margin: 0 0 2rem 0;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.hero h2 {
    color: #0033a0;
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.intro {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: #555;
    text-align: justify;
}

.hero p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 1rem;
    text-align: justify;
}

.about {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 2rem 1.5rem;
    margin: 0;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.about h3 {
    color: #0033a0;
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.about p {
    font-size: 1.1rem;
    color: #666;
    text-align: justify;
}

footer {
    background: rgba(255, 255, 255, 0.95);
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

footer p {
    color: #666;
    font-size: 0.9rem;
}

/* Floating Button */
.floating-button {
    position: fixed;
    bottom: 30px;
    background: #81acab;
    color: white;
    padding: 18px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: 0 5px 25px rgba(129, 172, 171, 0.4);
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    line-height: 1.4;
    z-index: 1000;
}

.floating-button--left {
    left: 30px;
}

.floating-button--right {
    right: 30px;
}

.floating-button--internal {
    background: #ff7f50;
}

.floating-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(129, 172, 171, 0.6);
    background: #6d9594;
}

.floating-button--internal:hover {
    background: #e66e3f;
}

.floating-button:active {
    transform: translateY(-1px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .main-nav {
        gap: 1rem;
        top: 0.75rem;
        right: 0.75rem;
    }

    .main-nav a {
        font-size: 0.9rem;
    }

    main {
        padding: 2.5rem 15px;
    }

    .hero h2 {
        font-size: 1.8rem;
        margin-bottom: 1rem;
    }

    .intro {
        font-size: 1.05rem;
        margin-bottom: 1rem;
    }

    .hero p,
    .about p {
        font-size: 0.95rem;
    }

    .about h3 {
        font-size: 1.6rem;
    }

    .floating-button {
        bottom: 20px;
        right: 20px;
        left: auto;
        padding: 12px 16px;
        font-size: 0.8rem;
        max-width: 40%;
        min-width: 150px;
    }

    .floating-button--left {
        left: 20px;
        right: auto;
    }

    .hero,
    .about {
        padding: 1.5rem 1.25rem;
    }

    footer {
        padding: 1rem 15px;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .main-nav {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-end;
        top: 0.5rem;
        right: 0.5rem;
    }

    .main-nav a {
        font-size: 0.85rem;
    }

    main {
        padding: 2rem 10px;
    }

    .hero h2,
    .about h3 {
        font-size: 1.4rem;
    }

    .intro {
        font-size: 1rem;
    }

    .hero p,
    .about p {
        font-size: 0.9rem;
    }

    .hero,
    .about {
        padding: 1.25rem 1rem;
    }

    .floating-button {
        bottom: 15px;
        right: 15px;
        left: auto;
        max-width: 40%;
        min-width: 120px;
        font-size: 0.75rem;
        padding: 10px 14px;
    }

    .floating-button--left {
        left: 15px;
        right: auto;
    }

    footer {
        font-size: 0.8rem;
    }
}