/* Global styles */
html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: Arial, sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #1a1a1a;
    position: relative;
}

.background-image {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 200vw;
    height: 200vh;
    background-image: url('../image/03.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    animation: rotate 20s linear infinite;
    opacity: 0.8;
    z-index: -1;
    transform-origin: center center;
    transform: translate(-50%, -50%);
}

@keyframes rotate {
    from {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.container {
    background: rgba(42, 42, 42, 0.9);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 90;
}

.tabs {
    display: flex;
    gap: 1rem;
}

.tab {
    padding: 1rem 2rem;
    background: rgba(58, 58, 58, 0.8);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 1.2rem;
    backdrop-filter: blur(5px);
    font-weight: 400;
}

.tab:hover {
    background: rgba(74, 74, 74, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

h1 {
    color: #fff;
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: bold;
}

.home-button {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 0.8rem 1.5rem;
    background: rgba(58, 58, 58, 0.8);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 1rem;
    z-index: 1000;
    backdrop-filter: blur(5px);
    font-weight: 400;
}

.home-button:hover {
    background: rgba(74, 74, 74, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.instruction-box {
    position: fixed;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.4);
    padding: 1.5rem;
    border-radius: 15px;
    color: #fff;
    font-size: 0.9rem;
    line-height: 1.6;
    max-width: 300px;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 100;
}

.instruction-box h2 {
    margin: 0 0 1rem 0;
    font-size: 1.2rem;
    font-weight: bold;
}

.instruction-box ul {
    margin: 0;
    padding-left: 1.5rem;
}

.instruction-box li {
    margin-bottom: 0.5rem;
}