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

    :root {
        --gold: #c9a84c;
        --white: #ffffff;
    }

    body { font-family: sans-serif; overflow: hidden; }

    .progress-container {
        position: fixed;
        top: 0; left: 0;
        width: 100%; height: 4px;
        background: rgba(255,255,255,0.2);
        z-index: 100;
    }

    #progress-bar {
        height: 100%;
        background: var(--gold);
        width: 0%;
        transition: width 0.1s linear;
    }

    .world-history-container {
        width: 100vw;
        height: 100vh;
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
        position: relative;
        transition: background-image 0.6s ease;
    }

    .world-history-container::before {
        content: '';
        position: absolute;
        inset: 0;
        background: rgba(0,0,0,0.55);
        z-index: 1;
    }

    .content-wrapper {
        position: relative;
        z-index: 2;
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        padding: 0 50px;
    }

    .content {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        gap: 40px;
    }

    .text-section {
        flex: 1;
        color: var(--white);
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.5s ease, transform 0.5s ease;
    }

    .text-section.active {
        opacity: 1;
        transform: translateY(0);
    }

    .text-section h1 {
        font-size: 3rem;
        font-weight: 800;
        color: var(--gold);
        margin-bottom: 20px;
        line-height: 1.2;
    }

    .text-section p {
        font-size: 1.1rem;
        line-height: 1.7;
        margin-bottom: 30px;
        color: rgba(255,255,255,0.85);
    }

    .btn-group { display: flex; gap: 15px; flex-wrap: wrap; }

    .primary-btn {
        background: var(--gold);
        color: #000;
        border: none;
        padding: 16px 40px;
        border-radius: 50px;
        font-weight: 800;
        text-transform: uppercase;
        cursor: pointer;
        transition: 0.3s;
        font-size: 0.9rem;
    }

    .primary-btn:hover {
        background: var(--white);
        transform: translateY(-3px);
    }

    .images-section {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
        width: 480px;
        flex-shrink: 0;
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.5s ease 0.15s, transform 0.5s ease 0.15s;
    }

    .images-section.active {
        opacity: 1;
        transform: translateY(0);
    }

    .img-card {
        width: 100%;
        aspect-ratio: 16/10;
        border-radius: 12px;
        overflow: hidden;
        border: 2px solid rgba(255,255,255,0.15);
    }

    .img-card img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        object-position: center;
        display: block;
        transition: transform 0.4s ease;
    }

    .img-card:hover img {
        transform: scale(1.05);
    }

    .nav-controls {
        position: absolute;
        bottom: 50px;
        right: 50px;
        display: flex;
        gap: 15px;
        z-index: 5;
    }

    .nav-arrow {
        width: 60px;
        height: 60px;
        border-radius: 50%;
        border: 1px solid rgba(255,255,255,0.2);
        background: rgba(0,0,0,0.3);
        color: #fff;
        cursor: pointer;
        transition: 0.3s;
        font-size: 1rem;
    }

    .nav-arrow:hover { background: var(--gold); color: #000; }

    .home-link {
        position: absolute;
        top: 40px;
        left: 50px;
        z-index: 10;
        color: #fff;
        text-decoration: none;
        font-weight: bold;
        display: flex;
        align-items: center;
        gap: 10px;
        background: rgba(255,255,255,0.1);
        padding: 10px 20px;
        border-radius: 15px;
        backdrop-filter: blur(4px);
    }

    @media (max-width: 1024px) {
        .content { flex-direction: column; text-align: center; }
        .text-section h1 { font-size: 2.5rem; }
        .images-section { width: 100%; }
        .btn-group { justify-content: center; }
    }

    @media (max-width: 600px) {
        .content-wrapper { padding: 0 20px; }
        .text-section h1 { font-size: 1.8rem; }
        .images-section { gap: 8px; }
    }