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

.back-link {
    display: inline-block;
    margin-bottom: 15px;
    color: #1976d2;
    text-decoration: none;
    font-weight: 500;
    font-size: clamp(0.85rem, 1.8vw, 1rem);
}

.back-link:hover {
    text-decoration: underline;
}

footer {
    color: #666;
    text-align: center;
    padding: clamp(15px, 2vw, 25px);
    font-size: clamp(0.75rem, 1.8vw, 1.1rem);
    line-height: 1.6;
}

footer p {
    margin: 0;
}

footer a {
    color: #1976d2;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.footer-line {
    margin-top: 4px;
}

.game-info-box {
    background: #f8f9fa;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 15px;
    font-size: 0.85rem;
    color: #555;
    line-height: 1.4;
    text-align: left;
}

.hidden {
    display: none !important;
}

.loading {
    text-align: center;
    padding: 60px 20px;
    color: #666;
    font-size: clamp(1rem, 2vw, 1.2rem);
}

.install-prompt {
    background: #e3f2fd;
    border: 1px solid #1976d2;
    color: #333;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
    display: none;
}

.install-prompt.show {
    display: block;
}

.install-prompt button {
    margin-top: 10px;
    background: #1976d2;
    color: white;
    border-color: #1976d2;
}

.fullscreen-fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    background: #1976d2;
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    transition: all 0.3s;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.fullscreen-fab:hover {
    background: #1565c0;
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0,0,0,0.4);
}

.fullscreen-fab:active {
    transform: scale(0.95);
}