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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: url("https://i.postimg.cc/fbw9z0p4/0050.jpg") no-repeat center center fixed;
    background-size: cover;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    position: relative;
    overflow: hidden;
}

/* ---- 背景模糊层，仅调整模糊度 ---- */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backdrop-filter: blur(5px); /* 模糊加大一点 */
    background: rgba(255, 255, 255, 0.10);
    z-index: 0;
}

/* 粒子容器 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* 粒子样式（更亮、更动感） */
.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.35);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

/* 8 个粒子（大小、位置更分散） */
.particle:nth-child(1) { width: 60px; height: 60px; top: 20%; left: 10%; animation-delay: 0s; }
.particle:nth-child(2) { width: 40px; height: 40px; top: 65%; left: 70%; animation-delay: 1.5s; }
.particle:nth-child(3) { width: 30px; height: 30px; top: 80%; left: 25%; animation-delay: 2.8s; }
.particle:nth-child(4) { width: 80px; height: 80px; top: 35%; left: 85%; animation-delay: 0.8s; }
.particle:nth-child(5) { width: 55px; height: 55px; top: 10%; left: 60%; animation-delay: 3.2s; }
.particle:nth-child(6) { width: 25px; height: 25px; top: 50%; left: 15%; animation-delay: 4.5s; }
.particle:nth-child(7) { width: 45px; height: 45px; top: 75%; left: 85%; animation-delay: 1s; }
.particle:nth-child(8) { width: 35px; height: 35px; top: 30%; left: 40%; animation-delay: 2s; }

/* 粒子更大的浮动范围 */
@keyframes float {
    0%   { transform: translate(0, 0) rotate(0deg); opacity: 0.3; }
    50%  { transform: translate(-40px, -60px) rotate(180deg); opacity: 0.9; }
    100% { transform: translate(0, 0) rotate(360deg); opacity: 0.3; }
}

/* 半透明磨砂容器 */
.container {
    background: rgba(255, 255, 255, 0.10);
    backdrop-filter: blur(5px);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    padding: 3rem;
    text-align: center;
    max-width: 480px;
    width: 90%;
    animation: fadeIn 0.6s ease-out;
    border: 1px solid rgba(255, 255, 255, 0.15);
    position: relative;
    z-index: 2;
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 2rem;
    display: block;
    border: 3px solid rgba(255, 255, 255, 0.7);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.logo {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #212529;
}

.subtitle {
    font-size: 1rem;
    color: #6c757d;
    margin-bottom: 2.5rem;
}

.nav-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.nav-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

/* 入场效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .container {
        padding: 2rem 1.5rem;
    }
    .particle {
        display: none;
    }
}