body {
    font-family: "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #f7f9fc, #eaeef3);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    color: #333;
}
header {
    text-align: center;
    margin-bottom: 30px;
}
header .logo {
    width: 160px;
    display: block;
    margin: 0 auto 10px;
}
header h1 {
    font-size: 24px;
    color: #0a437d;
}
.container {
    text-align: center;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.loader {
    border: 8px solid #f3f3f3;
    border-top: 8px solid #0a437d;
    border-radius: 50%;
    width: 70px;
    height: 70px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.countdown {
    font-size: 22px;
    margin-bottom: 15px;
    color: #0a437d;
    font-weight: bold;
}
.message {
    font-size: 18px;
    color: #555;
    margin-bottom: 20px;
    line-height: 1.8;
}
.btn {
    display: inline-block;
    background-color: #f26419;
    color: #fff;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 16px;
    font-weight: bold;
    transition: background 0.3s ease;
}
.btn:hover {
    background-color: #d35400;
}