* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #e6f7ff, #f5f7fa);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #333;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    padding: 48px 32px;
    animation: fadeInUp 0.6s ease-out;
    transition: transform 0.3s ease;
}

.login-container:hover {
    transform: translateY(-5px);
}

.login-header {
    text-align: center;
    margin-bottom: 36px;
}

.login-header h1 {
    color: #1890ff;
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.login-header p {
    color: #888;
    font-size: 15px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-size: 14px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.3s ease;
    background-color: #fafafa;
}

.form-group input:focus {
    border-color: #1890ff;
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.15);
    outline: none;
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(to right, #1890ff, #40a9ff);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.5px;
}

.login-btn:hover {
    background: linear-gradient(to right, #40a9ff, #1890ff);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(24, 144, 255, 0.25);
}

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

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式 */
@media (max-width: 480px) {
    .login-container {
        padding: 36px 24px;
        border-radius: 12px;
    }

    .login-header h1 {
        font-size: 28px;
    }

    .login-btn {
        font-size: 15px;
    }
}