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

body {
    font-family: 'Times New Roman', Times, serif;
    height: 100vh;
    overflow-x: hidden;
    background-color: #1c1c1c;
    color: #f8f8f8;
}

nav {
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background: rgba(20, 20, 20, 0.85);
    backdrop-filter: blur(6px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.nav-container {
    max-width: 1200px;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #ffffff;
}

.links {
    list-style: none;
    display: flex;
    gap: 30px;
    transition: max-height 0.3s ease-in-out;
}

.links li {
    font-size: 18px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 5px;
    transition: 0.3s;
}

.links li:hover {
    background-color: rgba(240, 217, 181, 0.1);
    color: #ffffff;
}

.hamburger {
    font-size: 28px;
    cursor: pointer;
    color: #ffffff;
    display: none;
}

video {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    object-fit: cover;
    z-index: -1;
}

.chess-main-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.85);
    color: #ffffff;
    padding: 18px 45px;
    font-size: 22px;
    font-weight: 700;
    border: 2px solid #ffffff;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(6px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.chess-main-button:hover {
    background-color: rgba(255, 255, 255, 0.95);
    color: #000;
    transform: translate(-50%, -50%) scale(1.05);
}

.chess-icon {
    margin: 0 10px;
}

a {
    text-decoration: none;
}

@media (max-width: 768px) {
    .links {
        position: absolute;
        top: 80px;
        right: 0;
        flex-direction: column;
        background-color: rgba(30, 30, 30, 0.95);
        width: 100%;
        max-height: 0;
        overflow: hidden;
        padding: 0;
    }

    .links.show {
        max-height: 500px;
        padding: 20px 0;
    }

    .links li {
        padding: 12px 20px;
        font-size: 18px;
    }

    .hamburger {
        display: block;
    }

    .chess-main-button {
        font-size: 18px;
        padding: 12px 30px;
        margin-top: 100px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 20px;
    }

    .chess-main-button {
        font-size: 16px;
        padding: 10px 20px;
    }
}