/* 固定页眉样式 */
.fixed-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 10px 20px;
    display: flex;
    justify-content: flex-start; /* 改为从左侧开始 */
    align-items: center;
    z-index: 1000;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-text {
    font-size: 1.2rem;
    font-weight: bold;
}

.header-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: transparent;
    transition: all 0.3s ease;
    cursor: pointer;
    animation: spin 2s linear infinite;
    animation-play-state: paused;
}

.header-circle:hover {
    animation-play-state: running;
    cursor: none;
}

.header-circle img {
    object-fit: contain;
    width: 100%;
    height: 100%;
    border-radius: 50%;
}

.header-circle i {
    color: white;
    font-size: 1.5rem;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}