/* CSS Variables for Color Scheme */
    :root {
        --main-color: #2C3E50;
        --secondary-color: #ECF0F1;
        --accent-color: #E67E22;
        --hover-color: #FFD700;
        --text-color: #2C3E50;
        --background-color: #ECF0F1;
        --font-family: 'Roboto', sans-serif;
    }

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

    body {
        font-family: var(--font-family);
        background-color: var(--secondary-color);
        color: var(--text-color);
        line-height: 1.6;
        padding-top: 60px;
        transition: background-color 0.3s ease, color 0.3s ease;
    }

    a {
        color: var(--accent-color);
        text-decoration: none;
        transition: color 0.3s ease;
    }

    a:hover {
        color: var(--hover-color);
    }

    /* Fixed Navigation Bar */
    nav {
        background-color: var(--main-color);
        color: white;
        padding: 10px 20px;
        position: fixed;
        top: 0;
        width: 100%;
        z-index: 1000;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        display: flex;
        justify-content: space-between;
        align-items: center;
        transition: background-color 0.3s ease;
    }

    nav .logo {
        font-size: 1.5rem;
        font-weight: bold;
    }

    nav ul {
        list-style: none;
        display: flex;
    }

    nav ul li {
        margin-left: 20px;
    }

    nav ul li a {
        font-size: 1rem;
        font-weight: 500;
        position: relative;
    }

    nav ul li a::after {
        content: '';
        display: block;
        width: 0;
        height: 2px;
        background: var(--hover-color);
        transition: width 0.3s;
        position: absolute;
        bottom: -5px;
        left: 0;
    }

    nav ul li a:hover::after {
        width: 100%;
    }

    /* Header Section */
    header {
        background: linear-gradient(135deg, var(--main-color), #34495E);
        color: white;
        padding: 60px 20px;
        text-align: center;
        position: relative;
    }

    header h1 {
        font-size: 2.5rem;
        margin-bottom: 20px;
        animation: fadeInDown 1s ease-out;
    }

    header p {
        font-size: 1.2rem;
        max-width: 800px;
        margin: 0 auto;
        animation: fadeInUp 1s ease-out;
    }

    /* Sections */
    section {
        padding: 60px 20px;
        max-width: 1200px;
        margin: 0 auto;
    }

    section:nth-child(even) {
        background: linear-gradient(135deg, #F0F3F4, var(--secondary-color));
    }

    .section-title {
        font-size: 1.8rem;
        margin-bottom: 20px;
        color: var(--main-color);
        position: relative;
    }

    .section-title::after {
        content: '';
        width: 50px;
        height: 3px;
        background: var(--accent-color);
        position: absolute;
        left: 0;
        bottom: -10px;
    }

    .content-block {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        margin-bottom: 40px;
    }

    .content-block img {
        width: 100%;
        max-width: 400px;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .content-block img:hover {
        transform: scale(1.05);
        box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    }

    .content-text {
        flex: 1;
        padding: 20px;
    }

    .content-text h3, .content-text h4 {
        color: var(--main-color);
        margin-bottom: 15px;
    }

    .content-text ul {
        list-style: disc inside;
        margin-left: 20px;
    }

    /* Tabs Section */
    .tab {
        overflow: hidden;
        background-color: var(--main-color);
        border-radius: 5px;
    }

    .tab button {
        background-color: inherit;
        float: left;
        border: none;
        outline: none;
        cursor: pointer;
        padding: 14px 16px;
        transition: background-color 0.3s ease;
        font-size: 1rem;
        color: white;
    }

    .tab button:hover {
        background-color: var(--accent-color);
    }

    .tab button.active {
        background-color: var(--hover-color);
    }

    .tabcontent {
        display: none;
        padding: 20px;
        border: 1px solid #ddd;
        border-top: none;
        animation: fadeIn 0.5s ease-in-out;
        background-color: white;
        border-radius: 0 0 5px 5px;
    }

    /* Footer */
    footer {
        background-color: var(--main-color);
        color: white;
        text-align: center;
        padding: 20px;
        position: relative;
        bottom: 0;
        width: 100%;
    }

    /* Responsive Design */
    @media screen and (max-width: 768px) {
        .content-block {
            flex-direction: column;
        }

        nav ul {
            flex-direction: column;
            background-color: var(--main-color);
            position: absolute;
            top: 60px;
            left: -100%;
            width: 100%;
            transition: left 0.3s ease;
        }

        nav ul.show {
            left: 0;
        }

        nav ul li {
            margin: 10px 0;
        }

        .tab button {
            width: 100%;
            text-align: left;
        }
    }

    @media screen and (max-width: 600px) {
        header h1 {
            font-size: 2rem;
        }

        .section-title {
            font-size: 1.5rem;
        }

        .content-text {
            padding: 10px;
        }

        nav .menu-toggle {
            display: block;
            cursor: pointer;
            font-size: 1.5rem;
        }
    }

    /* Animations */
    @keyframes fadeInDown {
        from {
            opacity: 0;
            transform: translateY(-20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes fadeIn {
        from {opacity: 0;}
        to {opacity: 1;}
    }

    /* Image Gallery */
    .image-gallery {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 20px;
    }

    .image-gallery img {
        width: 100%;
        border-radius: 8px;
        transition: transform 0.3s, box-shadow 0.3s;
    }

    .image-gallery img:hover {
        transform: scale(1.1);
        box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    }

    /* Decorative Elements */
    .divider {
        height: 2px;
        background: linear-gradient(to right, var(--accent-color), var(--hover-color));
        margin: 40px 0;
        border: none;
    }

    /* Prompt Message */
    .reference-note {
        background-color: rgba(255, 215, 0, 0.1);
        border-left: 4px solid var(--hover-color);
        padding: 10px 20px;
        margin: 20px 0;
        font-style: italic;
    }