/* ========================================
   基础样式 - 全局设置
   ======================================== */

/* === 全局样式 === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
    background-image: 
        linear-gradient(135deg, rgba(15, 12, 41, 0.85) 0%, rgba(26, 20, 70, 0.85) 25%, rgba(36, 36, 62, 0.85) 50%, rgba(48, 43, 99, 0.85) 75%, rgba(36, 36, 62, 0.85) 100%),
        url('https://images.unsplash.com/photo-1419242902214-272b3f66ee7a?w=1920');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: #e0e6ed;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* 星空闪烁层 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, #eee, transparent),
        radial-gradient(2px 2px at 60px 70px, #fff, transparent),
        radial-gradient(1px 1px at 50px 50px, #ddd, transparent),
        radial-gradient(1px 1px at 130px 80px, #fff, transparent),
        radial-gradient(2px 2px at 90px 10px, #eee, transparent),
        radial-gradient(1px 1px at 150px 120px, #fff, transparent),
        radial-gradient(2px 2px at 180px 60px, #eee, transparent);
    background-size: 200px 200px;
    animation: twinkle 8s infinite;
    opacity: 0.4;
    z-index: 0;
    pointer-events: none;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.5; }
}

/* === 滚动条美化 === */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(15, 12, 41, 0.5);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

/* === 通用动画 === */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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