/* 通用样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: #0a0a0a;
    color: #fff;
    overflow-x: hidden;
}

/* 星空背景 */
.stars, .twinkling {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    display: block;
    z-index: -1;
}

.stars {
    background: #000;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, #eee, transparent),
        radial-gradient(2px 2px at 60px 70px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 50px 50px, #fff, transparent),
        radial-gradient(1px 1px at 80px 10px, rgba(255,255,255,0.6), transparent),
        radial-gradient(2px 2px at 90px 40px, #eee, transparent),
        radial-gradient(1px 1px at 33px 60px, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 10px 80px, #fff, transparent),
        radial-gradient(2px 2px at 40px 90px, rgba(255,255,255,0.6), transparent);
    background-repeat: repeat;
    background-size: 200px 200px;
    animation: move-stars 200s linear infinite;
}

.twinkling {
    background: transparent;
    background-image: 
        radial-gradient(1px 1px at 25px 35px, #fff, transparent),
        radial-gradient(1px 1px at 65px 75px, rgba(255,255,255,0.9), transparent),
        radial-gradient(1px 1px at 55px 55px, #fff, transparent),
        radial-gradient(1px 1px at 85px 15px, rgba(255,255,255,0.7), transparent),
        radial-gradient(1px 1px at 95px 45px, #fff, transparent),
        radial-gradient(1px 1px at 38px 65px, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 15px 85px, #fff, transparent),
        radial-gradient(1px 1px at 45px 95px, rgba(255,255,255,0.7), transparent);
    background-repeat: repeat;
    background-size: 200px 200px;
    animation: move-twink-back 200s linear infinite;
}

@keyframes move-stars {
    from { background-position: 0 0; }
    to { background-position: 200px 200px; }
}

@keyframes move-twink-back {
    from { background-position: 0 0; }
    to { background-position: -10000px 5000px; }
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s;
    font-size: 14px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn:active {
    transform: translateY(0);
}

/* 加载动画 */
.loading {
    text-align: center;
    padding: 20px;
}

.spinner {
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

/* 消息提示 */
.message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    background: rgba(0, 0, 0, 0.8);
    border-left: 4px solid #667eea;
    border-radius: 5px;
    z-index: 10000;
    animation: slideIn 0.3s;
}

.message.success {
    border-left-color: #4caf50;
}

.message.error {
    border-left-color: #f44336;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}