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

body {
    font-family: "Microsoft YaHei", sans-serif;
    background: linear-gradient(120deg, #3498db, #8e44ad);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-container {
    background: rgba(255, 255, 255, 0.9);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    width: 400px;
}

.login-box h2 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.login-form input {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    outline: none;
    transition: border-color 0.3s;
}

.login-form input:focus {
    border-color: #3498db;
}

.login-btn {
    background: #3498db;
    color: white;
    padding: 12px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    text-align: center;
    text-decoration: none;
    transition: background 0.3s;
}

.login-btn:hover {
    background: #2980b9;
}